TL;DR – What’s the best Synthflow AI alternative?

To save you the time, we'll give it to you straight: Ringly.io is the best AI voice platform for Shopify.

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What is Synthflow?

Synthflow burst onto the scene in Berlin, Germany in 2023, founded by the dynamic trio of Albert Astabatsyan, Hakob Astabatsyan, and Sassun Mirzakhan-Saky. In just a short time, they've blown up to over 1,000 users, mostly small to medium businesses looking to build AI agents without coding.

They're the new kid on the block that's making a lot of noise in the industry by solving real problems for real businesses. If you're an SME looking to streamline your workflow, Synthflow has probably popped up in your research already - and for good reason.

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Top user complaints of Synthflow's AI phone agents

• Customer Support

• Billing Issues

• Limited Free Trial

• Language Limitations

• Update Communication

• Voice Quality Issues

• Pricing Concerns

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What to look for in top Synthflow alternatives

• Responsive customer service

• Transparent billing practices

• Generous trial period

• Multilingual capabilities

• Clear update protocols

• High-quality voice options

• Value-based pricing

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#1. Ringly.io - AI phone support for Shopify

Best for: Shopify stores that don't want to deal with customer service but just scale.

Product Hunt rating: 4.8/5 stars

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Founded in 2024 in Rotterdam, the Netherlands, by Maurizio Isendoorn and Ruben Boonzaaijer, Ringly.io is revolutionizing e-commerce customer service with AI phone agents.

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With 2,100+ customers, Ringly.io is the go-to solution for e-commerce stores looking to scale without scaling their support team. (BubbleCon 2024's "Most Innovative App")

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Features that make Ringly.io the #1 Goodcall alternative

• No-code setup, instant results – Ringly.io is ready to go in minutes. Just add your website, docs, or text and your AI phone agent instantly understands your business. It even updates automatically as your website changes.

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• ‍AI-powered sales & support – Ringly.io does both inbound and outbound calls. Provide real-time order tracking from Shopify, and convert more customers with personalized AI-driven conversations—not just reactive support.

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• Advanced analytics for smarter decisions – Ringly.io gives you real-time call data, customer intent tracking, and performance reports—helping you optimize support and sales strategies.

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• Scalable pricing without enterprise contracts – Ringly.io offers transparent, scalable pricing, pay on results, no locked-in contracts.

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Ringly.io cons:

• Not built for large enterprise call centers – Best for e-commerce and SMBs rather than massive enterprise call centers with complex IVR needs.
• Outbound calls require consent – Unlike human agents, AI outbound calling requires opt-in compliance, which varies by region.
• No custom code options – The Ringly.io platform is designed to easily create no-code ai phone agents, but less friendly for developers with more technical expertise that need versatile tools like custom code options.

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Ringly.io pricing plans:

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Reviews

"it stands out significantly ahead"- Bertrand, Director. We are at the initial stage of testing and have made only a few calls so far. Consequently, I have rated the product with four stars for now. However, I must express that the product has shown significant promise. When compared to competitors, it stands out significantly ahead.‍

"This is such a great product"- Jim Miranda, Founder. This is such a great product. I have been with you for less than a week and already closed 3 deals with it."

"It really sounds like a human"- Laix, Founder. Tried Ringly.io today and the quality of the phone calls surprises me! It really sounds like a human, and it reacts really fast. Will need to deploy it in action to see the full capabilities.

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Get started with Ringly.io for free

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2. Retell AI

Best for: Developers that want to build AI voice agents

G2 rating: 4.6/5 (12 reviews)

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Founded in the San Francisco Bay Area in 2023 by Todd Li, Evie Wang, Bing Wu, Weijia Yu, and Zexia Zhang, Retell AI is crushing it as the go-to platform for lightning-fast AI voice agent creation.

With over 3,000 businesses already on board, they're helping developers build human-like voice agents in just one day instead of months - a total game-changer for contact centers looking to level up their operations without the usual headaches.

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Features

• Talk in Many Languages Worldwide: Similar to Synthflow, Retell AI helps businesses talk to customers around the world. Synthflow AI matches this with support for "20+ languages with global number options."
• Easy Phone Setup: Retell AI connects to your current phone systems and makes it easy to manage and scale AI agents. Synthflow AI offers "200+ integrations" including CRM, telephony, and calendars to get you connected fast.
• Keeps Data Safe: Retell AI has important safety certifications like SOC 2 and HIPAA. Synthflow AI includes similar protections with "Compliance (SOC2, HIPAA, GDPR)" for their Enterprise users.
• Watches How Calls Go: Retell AI shows you how calls are doing with real-time AI transcription. Synthflow AI doesn't specifically highlight analytics but mentions "Security & Compliance" which might include call monitoring.

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Cons

• Could Be Easier to Use: Some people think Retell AI's screens are a bit tricky. Synthflow AI focuses on being "no-code" with a simple 3-step setup process to "Create an AI Agent," "Tailor to Your Needs," and "Connect and Go Live."
• Not Enough Voice Choices: Customers want more voice options with Retell AI. Synthflow AI lets you "pick or clone your voice," suggesting more flexibility.
• Slow Help When You Need It: Some say Retell AI takes too long to answer questions. Synthflow AI is from the same year, so they likely have the same issues.

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Pricing

• Pay-as-you-go: Retell AI charges $0.07–$0.31 per minute depending on what you use. Synthflow AI starts at $29/month for 50 minutes and goes up to $900/month for 4,000 minutes (about $0.22/min).
• Big Business Plan: Retell AI offers custom prices as low as $0.03 per minute. Synthflow AI's Enterprise plan can go "as low as $0.07/min" for high volumes.
• Extra Costs: Phone numbers and other add-ons cost more with Retell AI. Synthflow AI includes features like "Voice API, LLM, transcriber costs" in their base pricing.

The bottom line: Retell AI might be a cheaper generative AI agent builder for basic use but Synthflow AI offers a more complete package.

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Reviews

‍"Made our customer service smarter and faster" - Utkarsh M. We’ve been using Retell to build these voice agents for our customer service, for over a year. It’s so natural, people don’t even realize it’s not a human half the time. The responses are super quick too, like you’re having a real convo. It’s actually helped us cut down on how many calls our team has to take, and customers are definitely happier..less hold time and better answers. If you’re on the fence about trying it, just do it.‍

"Extremely slow customer service on discord even when unannounced API changes break product" - Jerry Y. The product is the same as others on the market -- we would switch instantly if there were no switching cost, these guys are not a reliable vendor.

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3. Poly AI

Best for: Large enterprises that need a tailored AI solution.

Gartner rating: 4.6/5 (13 reviews)

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Founded in 2017 in London, UK, Poly AI is an enterprise-grade conversational ai platform known to handle customer service calls with natural, human-like conversations. It was created by Nikola Mrkšić, Tsung-Hsien Wen, and Pei-Hao Su, who met while researching spoken dialog systems at Cambridge’s Machine Intelligence Lab.

Today, Poly AI serves 100+ enterprise customers, helping businesses with unique business requirements automate phone support at scale. Known for its best AI models and industry-specific solutions, it’s a go-to AI calling solution for companies looking to streamline inbound calls without sacrificing customer experience.

Ps. Wasn't Poly AI a chatbot? Yes, there was a private AI chatbot platform called Poly.AI, but they changed their name to PolyBuzz.

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Features

• Advanced Natural Language Processing: PolyAI uses super smart AI to understand what people say. Synthflow matches this with their "True Conversational AI" that "understands intent" and doesn't just follow scripts.
• Multilingual Support: PolyAI works in 40+ languages for talking to customers anywhere. Synthflow offers fewer but still impressive "20+ languages with global number options."
• 24/7 Availability: PolyAI never sleeps, helping customers any time of day. Synthflow advertises the same with their "24/7 Service" that's "always on, always reliable."
• Seamless Integration: PolyAI plugs into your existing systems easily. Synthflow boasts "over 200+ integrations" with CRMs, phone systems, and calendars.
• Scalability: PolyAI handles thousands of calls at once without breaking a sweat. Synthflow offers different levels from 5 concurrent calls (Starter) up to "200+ Concurrent Calls" (Enterprise).
• Advanced Speech Tech: PolyAI lets people talk using voice commands. Synthflow promotes "Best AI Voice Tech for Business" with human-like, empathetic calls.

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Cons

• Voice Quality Issues: Some people say PolyAI's voice changes in weird ways. Synthflow lets you "pick or clone your voice," which might solve this problem.
• Missing Deep Analytics: PolyAI doesn't give businesses enough data about calls. Synthflow doesn't highlight analytics either, so they might have the same weakness.
• Not Enough Customization: PolyAI can feel too rigid for some businesses. Synthflow offers a "Workflow Builder" and "Custom Workflows" that might be more flexible.
• Too Expensive for Big Plans: PolyAI costs a lot for growing companies. Synthflow's pricing is clear with plans starting at $29/month and volume discounts.
• Can't Try It Yourself: PolyAI makes you book a demo first. Synthflow offers "14-Day Free" trials on most plans so you can see if it works for you.

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Pricing

• PolyAI only works with big companies and makes you book a call to learn prices. Synthflow shows all prices upfront with plans from $29 to $1,400 per month.
• PolyAI has no free trial. Synthflow gives you 14 days free on most plans so you can test before you buy.

Bottom line: PolyAI might be better for huge companies, but Synthflow is more open about pricing and lets small businesses start using AI calls without a big commitment. If you want to try before you buy, Synthflow is your only option between these two.

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Reviews

"Conversational assistant of the highest quality" - Verified enterprise customer. The assistant itself is lifelike and constantly learning. The time saving it allows our staff onsite is the real value add. In comparison, competitor offerings seem robotic make customers feel like they are not being cared for.

"App is working slow" - Sagar R, Senior Recruitment Consultant. Sometimes the app is working slow and it will take time to initiate any command.

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4. Bland AI

Best for: Enterprise companies that want a voice ai platform to streamline customer support and sales

Product Hunt rating: 3.0/5 (10 reviews)

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Founded in San Francisco in 2023 by Isaiah Granet and Sobhan Nejad, Bland AI is an innovative platform for AI agents that interact with humans via the phone.

Bland AI is built for large enterprises that want to automate their customer support and sales with powerful AI, offering management of AI voice scalability and integrate seamlessly with CRMs and more. The platform stands out with its advanced capabilities like memory functionality across calls, conversational pathways, high-accuracy transcription, context-aware summarization, and confidence scoring.

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Features

• Voice Selection: Bland lets you pick from tons of real-sounding voices with different accents and styles. Synthflow keeps it simpler - you can "pick or clone your voice" but they don't brag about huge voice libraries.
• AI Models: Bland gives you three different AI brain speeds (simple, medium, super smart). Synthflow doesn't talk about different AI levels - you get what you get with their "True Conversational AI."
• Custom Prompts: Bland lets you tell your AI exactly how to talk and act. Synthflow does similar with their "Easily tailor and deploy AI voice agents" approach where you can "adapt with a prompt."
• Background Tracks: Bland makes calls sound real with coffee shop noises in the background. Synthflow doesn't mention this cool feature at all.
• Custom Tools: Bland connects to other apps during calls (if you're a bit techy). Synthflow has "over 200+ integrations" that might be easier to set up without coding skills.
• Language Support: Bland speaks 28 languages. Synthflow offers "20+ languages" - fewer options but still plenty for most businesses.
• Inbound Call Handling: Like Bland AI, Synthflow answers calls automatically with custom greetings.

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Cons

• Reliability Issues: Bland's AI sometimes gets tongue-tied or cuts off mid-sentence. Synthflow doesn't mention this problem - they claim to be "Powering over 10M+ voice calls every month" so they might be more stable.
• Setup Complexity: Bland might take hours to set up right. Synthflow brags about their "3-step" process that sounds much easier.
• Customer Service Concerns: Bland's support can be slow. Synthflow offers different support levels from "Community Support" for beginners up to "Solution Architect" for big spenders.
• Can't Match Human Connection: Bland still feels a bit robotic for sensitive stuff. Synthflow claims their AI is "human-like, empathetic" so maybe they're better at the warm fuzzy feelings.

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Pricing

• Bland charges a simple $0.09/minute for everyone. Synthflow starts higher at $29/month for just 50 minutes (that's about $0.58/minute!) but can go as low as $0.07/minute for big Enterprise users.
• Bland has basic Standard, Enterprise, and Custom plans. Synthflow gives you five clear options from Starter ($29/mo) to Enterprise (custom pricing).
• Bland has a strict no cancellations, no refunds policy. Synthflow offers 14-Day Free trials on most plans so you can bail if you don't like it.

Bottom line: Bland is cheaper to try and has more voice features, but Synthflow might be easier to set up and more reliable for serious businesses. If you're just testing the waters, Bland's simple per-minute pricing looks better, but for the long haul, Synthflow's volume discounts could save you big bucks.

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Reviews

"Extremely impressed" ‍- Casper Boutens. Extremely impressed by Bland, the team is improving their product every week, they offer great support and all by all great phone calls made by their AI.

‍"Doesn't work at all" - Albert Salgueda. Doesn't work at all. I call and it doesn't speak, it gets interrupted... still not there.

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5. Goodcall

Best for: Local businesses that want to streamline customer service

Product Hunt and Trustpilot rating: 3.6/5 (6 reviews)

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Founded in 2021 in Palo Alto, California by Bob Summers, Goodcall is revolutionizing customer service and sales with its innovative Agentic Voice AI. With over 2,000 users, Goodcall helps local businesses streamline their operations by automating call handling and sales processes, ensuring no opportunity is missed.

Key features include 24/7 call handling, lead capture and qualification, customizable AI skills, appointment scheduling, and seamless CRM integration. By offering detailed call analysis and optimizing workflows, Goodcall is designed to enhance customer service, and stay ahead in today’s fast-paced market.

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Features

• Lead Capture: GoodCall grabs caller info right away and texts you immediately. SynthFlow has similar "instant lead qualification" but calls it "Built-in Workflows" instead.
• Customizable Skills: GoodCall's AI gets smarter the more you teach it. SynthFlow lets you "tailor to your needs" with their "no-code AI" approach that's super simple.
• Appointment Scheduling: GoodCall books meetings without you doing anything. SynthFlow matches this with "Real-Time Booking" features in all their plans.
• Integration with Tools: GoodCall works with your CRM, Google Voice, and Slack. SynthFlow goes even bigger with "200+ integrations" including all your favorite tools.

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Cons

• Always Trying to Sell You Stuff: GoodCall pushes upgrades constantly. SynthFlow has clear pricing tiers and doesn't seem as pushy - they even let you try free for 14 days!
• Terrible Support: GoodCall makes it hard to get help when things break. SynthFlow offers different support levels from basic "Community Support" up to a personal "Solution Architect" for the big spenders.
• Service Goes Down: GoodCall's phone numbers and voicemail can be flaky. SynthFlow claims to be "Powering over 10M+ voice calls every month" so they might be more stable.
• Overpromising: GoodCall's free plan wasn't as amazing as they said. SynthFlow doesn't push a free plan - they're upfront that you'll pay, but they let you test drive it first.

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Pricing

• GoodCall uses a customer-based model: $59/month for 100 customers, $99/month for 250 customers, $199/month for 500 customers.
• SynthFlow uses a minutes-based model: Starting at $29/month for just 50 minutes up to $900/month for 4,000 minutes (with bigger enterprise plans available).

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Reviews

"Incredible product" - Danny Lannon. saves me so much time, and I've been able to capture leads in an entirely new way. 100% worth it and saves me a ton of time.

"Customer dis-service" - Merle Craner. When I call a customer service number, I expect a number of options to eventually get to a person to deal with the problem. Goodcall starts immediately with upsell options to service I don't want or need. There is no interaction, just a constant sales pitch. If you have the patience, you will be told they can't help with the problem and provide another number to go through the exact same process again.

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6. Play AI

Best for: Businesses looking to scale customer service operations and want many voices and characters.

Trustpilot rating: 3.6/5 (259 reviews)

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Founded in 2022 in Mountain View, California, Play AI was created by Hammad Syed and Mahmoud Felfel. The company specializes in transforming written text into realistic, natural-sounding voiceovers and AI voice agents, making it easy for anyone to integrate lifelike voices into their projects.

With a focus on AI voice generation, Play AI offers a wide array of features including voice cloning, support for 142 languages, emotion-driven voices, speaking styles, and advanced audio analytics. The intuitive user interface ensures that users, regardless of technical expertise, can easily create custom voice solutions.

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Features

• Multi-Voice conversational AI capabilities: Create dynamic audio by blending different voices within a single audio file for seamless conversations. Synthflow doesn't highlight this kind of voice blending in their marketing.
• Voice Cloning: Play AI copies voices with amazing accuracy, keeping the original's rhythm, tone, and emotion - much more advanced than Synthflow's voice selection options.
• Speech Styles: Pick from emotional and expressive speaking styles to make voices sound more real and engaging. Synthflow doesn't put much focus on different speech styles like Play AI does.
• API Integration: Easily plug Play AI's voice technology into your apps and devices for instant audio delivery, while Synthflow focuses more on handling complete phone calls.
• Custom Pronunciations: Play AI lets you fix how specific words are said to make sure everything sounds right. Synthflow doesn't mention this level of word-by-word control.

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Cons

• Refund Issues – Lots of customers say they can't get their promised refunds, with some waiting 6-9 months without getting paid back.
• Misleading Claims – Many reviews suggest the product doesn't actually do what the ads say it can do.
• Poor Customer Service – Customers report being ignored, with support eventually ghosting them completely.
• Platform Stability – Users say the platform is full of bugs and tech problems that really hurt their business operations.

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Pricing

• Starter ($9/month): 50 minutes, 10 voice clones, basic features, perfect for personal projects.
• Creator ($49/month): 300 minutes, 50 voice clones, 1 professional clone, great for content creators.
• Pro ($99/month): 700 minutes, 500 voice clones, 3 professional clones, ideal for serious professionals.
• Scale ($299/month): 2500 minutes, 1000 voice clones, 5 professional clones, built for growing teams.
• Business ($999/month): 11,000 minutes, 2000 voice clones, advanced features, designed for big companies.

Compared to Synthflow's pricing (starting at $29/month with just 50 minutes, up to $1,400+/month for agency level), Play AI offers more minutes and voice options at lower price points, though Synthflow focuses more on complete call handling rather than just voice generation.

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Reviews

"Disappointing experience" - Raja Mohammad Zishanullah. I purchased the unlimited plan on Play.ht. The service is incredibly slow and plagued with frequent errors, making it nearly unusable. The newer voice models sound robotic and lack the natural flow that was initially promised. Customer service has been consistently poor, with slow and unhelpful responses. Overall, Play.ht has been a huge disappointment, and I would strongly advise avoiding their service.

"Excellent convenient service" - Core Partners Studio. Excellent convenient service for voiceover, a large database of realistic voices, very convenient to work as a team, great tech support. We will continue to work further!

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7. Vapi AI

Best for: developers building AI voice products

Product Hunt + Trustpilot rating: 4.4/5 (19 reviews)

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Founded in San Francisco in 2020 by Jordan Dearsley and Nikhil Gupta, Vapi is a cutting-edge platform that combines conversational ai with a configurable API that enables developers to build sophisticated voice artificial intelligence products and scale phone operations effortlessly.

With over 100,000 developers building on Vapi's infrastructure, the company has quickly established itself as a go-to solution for creating great voice experiences.

Vapi stands out with its powerful features including multilingual capabilities, automated testing, tool calling functionality, API-native architecture, and the flexibility to bring your own models and run A/B experiments.

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Features

• Multilingual Support
• API-Native
• Automated Testing
• Tool Calling

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Cons

• Limited International Number Support
• Account Management Frustrations
• Automation Heavy Support Experience
• Technical Complexity
• Still Maturing

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Pricing

• Vapi Startup Plan: $0.05/minute plus provider costs. Includes free credits and you can use your own API keys. No sneaky cancellation fees, and they'll refund unused time.
• Vapi Enterprise Plan: Custom pricing with higher limits and priority support. They prefer yearly contracts.
• Vapi Add-ons: From $2 to $5,000 monthly for extras like phone numbers and HIPAA compliance.

Synthflow starts at $29/month for just 50 minutes, jumping to $450/month for their Pro plan with 2,000 minutes ($0.13/min for extra), and goes up to $1,400/month for agencies. Unlike Vapi's simple per-minute model, Synthflow bundles features like concurrent calls and workflows into tiered packages.

Bottom line: Vapi seems better for developers who want control, while Synthflow might be easier for non-technical folks who want a ready-made solution - if you can get past their customer service issues.

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Reviews

"Amazing tool as well as after hours support on a Saturday night" - Robert Peter. Amazing system that they are building. I had issues on a Saturday night, and received a phone call from one of the technicians Sahil and he helped me through my issue. What dedication. I saw some of the other reviews, and they seem to be related to billings, and stuff that could easily be spoken about. I just wanted to give a shout out to this guy for his passion and dedication to the project.

"Unreliable" - Brent P, managing member. Support is non-existent and documentation is extremely poor. I spent a lot of time setting up an assistant which was working ok. Then they had a developer conference and rolled out a lot of new features and EVERYTHING broke. I spent hours and hours trying to get it working again to no avail. Emailed them and was told the "bugs" would be fixed tomorrow... then tomorrow.. then tomorrow. REALLY FRUSTRATING.

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What's the top 3 alternatives to Synthflow voice AI?

We've checked out all the AI voice assistants options so you don't have to waste time figuring it out yourself. Each product has its own strengths, but three clear winners stood out from the pack:

• Ringly.io - The easiest to use with Shopify. Gets you up and running in minutes, not months. Perfect for e-commerce with both inbound AND outbound calls that actually recover abandoned carts (35%+)

• Poly AI - Best for huge companies that need enterprise-level solutions. Superior conversation quality with 40+ languages, but comes with enterprise pricing to match.

• Vapi AI - The developer's choice when you need complete control. Most languages (100+) and fully customizable, but requires technical know-how.

For most businesses, especially online stores, Ringly.io is the clear winner. It costs 80% less than human agents, works instantly without any technical setup, and is the only option with a 110% money-back guarantee. Why struggle with complicated systems when you could be converting more customers today?

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Ready to see how Ringly.io can transform your customer support? Create a free account at Ringly.io today.

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