This post in 30 seconds.

• Klaviyo sits at 4.6/5 on G2 and Capterra, 4.5 on the Shopify App Store, and 1.8/5 on Trustpilot. That split tells you more than any single number.
• The product is genuinely strong at flows, segmentation, and its two-way Shopify sync. The complaints are almost all about one thing: the active-profiles billing model that shipped in February 2025.
• Written for the founder, COO, or Head of CX at a $10M-$100M Shopify brand who is either paying Klaviyo now or deciding whether to.

If you search "klaviyo reviews," the first thing you hit is a wall of 4.6-star aggregator pages. Then you find Trustpilot, where the same product scores 1.8. Two stars and a bit, on the same software, in the same year. That gap is the actual review. Everything else is detail.

I run phone support for Shopify brands, not email, so I have no horse in the Klaviyo-versus-its-competitors race. That is part of why I wanted to write this. Most "klaviyo reviews" on the front page are either review-site aggregators with no narrative or competitor blogs quietly steering you toward their own tool. If you run customer experience at a Shopify brand doing $10M-$100M, you want the honest version: is it good, what does it really cost in 2026, and is the billing rage real. We work with 50+ Shopify brands on the phone side and see Klaviyo running in almost all of them, so this is the view from next door. If you want to talk through your own support stack while you are at it, book a 30-min call and we will do the math live.

The rating snapshot

Here is where Klaviyo lands across the four review sources that matter for a Shopify brand, as of mid-2026.

The three software-review sites cluster tightly around 4.5 to 4.6. Trustpilot is the outlier, and it has been sliding: it dropped from 2.2/5 in mid-2024 to 1.8/5 by early 2026. Two things can both be true here, and they are. The people who use Klaviyo to actually run a marketing program tend to love it. The people writing on Trustpilot are mostly there to talk about a bill.

What Klaviyo actually is

Klaviyo is a B2C customer data platform with a marketing automation engine bolted to the front of it. In plain terms: it pulls your store data (orders, refunds, product catalog, customer lifetime value, fulfillment status) in near real time, then lets you build email, SMS, and WhatsApp messages off the back of it.

The data piece is the part people underrate. Klaviyo is not just an email tool. It builds a profile on every customer and uses that to power segmentation and prediction. Its predictive analytics will estimate a customer's next order date, their predicted lifetime value, and their churn probability, then feed those straight into a segment you can message.

The thing reviewers agree on, every single platform, is the Shopify integration. It is two-way, near real time, and granular. That is the reason a $10M-$100M Shopify brand picks Klaviyo over a cheaper generic email tool, and it is the reason switching away from it later feels expensive.

How I evaluated Klaviyo

I am Ruben, co-founder of Ringly. We run AI phone support for 50+ Shopify brands, which means I sit one channel over from email. I do not sell an email tool, so this is not a takedown to sell you mine.

For this review I did three things:

• Read the reviews at the extremes. I went through the top of G2 and Capterra and the bottom of Trustpilot, looking for the patterns that repeat rather than the one-off rants.
• Priced it out at real list sizes. I ran the 2026 pricing at 1,000, 5,000, 25,000, and 100,000 contacts so the numbers below are what a growing brand actually pays, not the headline starting price.
• Pulled our own call logs around sends. This is the part no other review has: I looked at what happens to inbound phone volume in the 24 to 48 hours after a Klaviyo campaign goes out at the brands we cover. More on that near the end, because it is the cost nobody mentions.

The verdict below reflects all three, not a single feature checklist.

What Klaviyo does well

The automation and segmentation are close to the strongest in the category, and that is the real reason brands stay. You can build essentially unlimited flows (abandoned cart, welcome, post-purchase, win-back, browse abandonment) and the segment builder handles complex conditional logic with real-time updates that lighter tools cannot match.

Here is where it earns the 4.6:

• Flows that actually fire on store events. Because the Shopify sync is near real time, a back-in-stock or post-purchase flow triggers off the real order, not a nightly import.
• Segmentation depth. Reviewers consistently call the segment builder one of the most flexible in the category. You can slice on predicted lifetime value, last order date, browse behavior, and more, and the segment updates live.
• Predictive analytics you can act on. The churn-probability and predicted-CLV scores are not decoration. They drop into a segment, so you can message at-risk or high-value customers without exporting anything.
• Deliverability that holds up. With clean list hygiene, well-run accounts hit the 95%+ inbox-placement benchmark Darkroom cites for 2026. Klaviyo's Spring 2026 Audience Optimization even scores each recipient's unsubscribe risk and pulls the high-risk ones before a send.
• The UX, once you are over the hump. New users find it steep. People who use it daily call it intuitive and productivity-focused. Both reviews are accurate, just from different points in the learning curve.

If your brand lives on email and SMS revenue, this is the tool that the rest of the category gets compared to. That is not marketing copy. It is what the 1,325 G2 reviews keep saying.

What reviewers complain about

Almost every serious complaint traces back to one decision: the billing change.

• Pricing scales faster than people expect. This is the single most common con on G2 and Capterra. "Once you start to scale the cost is ridiculous" is a paraphrase of dozens of reviews. Your bill tracks your list size, and your list grows whether or not your sending does.
• The active-profiles model stings. In February 2025 Klaviyo moved to charging on active profiles, meaning any contact you could email, text, or push to, not the contacts you actually email. One Trustpilot reviewer put it bluntly: "We send maybe two campaigns a month, yet under the new model you get charged simply for storing a profile, even if you never email them."
• Sticker-shock jumps. The sharpest Trustpilot reviews describe overnight increases: "Going from $39/month to over $200/month overnight due to a change in business model is unacceptable." When your dead weight (bot signups, customers inactive for years) counts toward the bill, the number moves fast.
• Support is hard to reach on lower tiers. Reviewers describe "dozens of attempts trying to reach customer service" and "very limited customer support." If you are not on a high tier, expect to self-serve through the help center.
• Large lists feel slow. Reviewers mention segment loading that lags on big lists and the occasional UI glitch on export. Minor next to the billing complaints, but real.

None of this makes Klaviyo a bad product. It makes it an expensive one that bills on a metric you do not fully control, and that is exactly the thing that turns a 4.6-star daily user into a 1.8-star Trustpilot reviewer the month their list crosses a tier.

Pricing in 2026: the active-profiles model

This is the section worth reading twice, because the model matters more than the headline price.

A few things to know, sourced from Klaviyo's pricing page and breakdowns like Omnisend's:

• You are billed on active profiles, not sends. An active profile is any contact with an email that is not suppressed or unsubscribed. Bot signups and customers who last bought three years ago both count. List hygiene is now a cost-control activity, not just a deliverability one.
• SMS is credits on top. Every paid plan includes 150 credits a month. Beyond that you buy packs at roughly $0.01 to $0.015 per message in the US, settling near $0.009 per credit at high volume. International rates run much higher.
• No annual discount. As of 2026 the self-serve plans bill monthly with no yearly commitment break. Enterprise terms are negotiated separately (see Klaviyo enterprise pricing for that path).

If you are evaluating the platform, the honest move is to count your real active profiles, not your emailable list, before you trust any quote. That number is usually bigger than people guess.

Why G2 says 4.6 and Trustpilot says 1.8

The gap is not a contradiction. It is two different rooms.

G2 and Capterra reviews come from marketers and admins who chose the tool, learned it, and get revenue out of it. They are rating the product. Klaviyo's automation and Shopify sync genuinely deliver for them, so they rate it high and the score has stayed stable at 4.6 for a long time.

Trustpilot is where people go when they are angry, and on Klaviyo they are almost all angry about the same thing: a bill that jumped after the active-profiles change. The score slid from 2.2 to 1.8 over the 15-plus months after that change shipped, which tells you the frustration is structural, not a bad week.

So read it this way. If you will use the product hard and you can keep your list clean, you are likely to be a G2-style reviewer. If you have a big dormant list and you send rarely, you are at risk of becoming a Trustpilot one. The split is really a question about your own usage, not a mystery about the software.

The cost no Klaviyo review mentions: the after-send phone surge

Here is the part I see that the aggregators and competitor blogs cannot, because they only look at the email side.

When a Klaviyo campaign goes out, your phone rings more. We watch the call logs at the brands we cover, and inbound volume reliably climbs in the 24 to 48 hours after a send. A promo blast brings "is this code still good." A back-in-stock email brings "is it actually in stock right now." A big launch email brings "where's my order from the sale," the WISMO calls that already make up the bulk of support volume. Older and higher-intent customers in particular do not reply to the email. They pick up the phone.

Klaviyo owns the message. The phone surge that message creates is not on the Klaviyo bill. It lands on your customer service team, usually right when a send goes out on a Friday afternoon and the queue is thin. If you have ever seen a product launch spike your support volume, you already know the shape of this.

To be clear about where the lines are: Klaviyo handles outbound marketing messages. It even ships its own customer-service product, but that is chat and text, not phone. The inbound phone calls a campaign generates are a separate problem, and it is the one we work on. Ringly.io is AI phone support for Shopify brands. The AI answers inbound calls 24/7, finds the order in your Shopify store, answers product questions from your knowledge base, and escalates the genuinely hard calls to whatever helpdesk you already run. Across 50+ brands it resolves about 73% of calls on its own at roughly $0.42 per resolved call. WashCo, a Shopify brand we launched, recovered $22,664 in its first 7 days on the phone.

The compliment we hear most from customers after they talk to it is the one that matters for this:

"My customers also feel like it's a normal person. They feel like they can communicate if they have questions."

Claudia Droge, TechCraft Studio

So the honest framing is not "Klaviyo versus Ringly." It is that a great send program and an answered phone are two halves of the same week. If your sends are climbing but your phone still goes to voicemail after 6 p.m., book a 30-min call and we will look at what your post-send call volume actually looks like.

Who Klaviyo is for, and who should look elsewhere

Choose Klaviyo if:

• You are a Shopify brand that runs on email and SMS revenue. The integration and the flow depth pay for themselves at $10M+ in revenue.
• You will use the segmentation and prediction. If you actually message based on predicted CLV and churn risk, the price makes sense.
• You can keep your list clean. Active-profile billing rewards hygiene. If you suppress dead contacts on a schedule, the cost stays sane.

Look harder at alternatives if:

• You send rarely and hold a big dormant list. You will pay to store profiles you never message. This is the exact Trustpilot complaint.
• You are early and cost-sensitive. Below a few million in revenue, a cheaper Klaviyo alternative may cover what you need.
• You need hands-on support on a low tier. Reaching a human is hard unless you are paying for it.

For most $10M-$100M Shopify brands, the answer is that Klaviyo is worth it, with eyes open on the billing. Just budget for the active-profile creep, and remember that the phone calls your sends create are a separate line item nobody put on the invoice.

Frequently asked questions

Is Klaviyo a good tool in 2026? Yes, for its core job. It holds 4.6/5 on G2 and Capterra and 4.5 on the Shopify App Store, driven by strong automation, segmentation, and a near-real-time Shopify integration. The low 1.8/5 on Trustpilot is almost entirely about billing, not the product itself.

Why is Klaviyo's Trustpilot rating so low? The 1.8/5 reflects billing frustration after the February 2025 move to active-profile pricing, which charges for stored contacts rather than emailed ones. Users with large dormant lists saw bills jump, and Trustpilot is where they vent. Daily power users on software-review sites still rate it 4.6.

How does Klaviyo pricing work now? You are billed on active profiles, meaning any contact you can email, text, or push to. The Email plan runs roughly $20/mo at 500 contacts up to about $1,350/mo at 100,000. SMS is credit-based on top, around $0.01 to $0.015 per message in the US.

Is Klaviyo worth it for a Shopify brand? For a $10M-$100M Shopify brand that runs real email and SMS programs, usually yes. The flow depth and Shopify sync are among the strongest in the category. The watch-out is list hygiene, since active-profile billing punishes dead weight.

Does Klaviyo handle phone support? No. Klaviyo handles outbound email, SMS, and WhatsApp, and its own customer-service product is chat and text. It does not answer inbound phone calls. For that you need a phone-support tool that sits alongside it.

What are the main downsides of Klaviyo? Cost that scales with list size, the active-profiles billing model, a steep learning curve for newcomers, slow segment loading on large lists, and limited support on lower tiers. The pricing is by far the most cited.

Does a Klaviyo campaign increase support volume? In our experience across 50+ Shopify brands, yes. Inbound phone calls climb in the 24 to 48 hours after a send, as customers call with promo, stock, and order-status questions rather than reply to the email. It is a real cost that sits on your CS team, not your Klaviyo bill.

Talk to us

Klaviyo is the right tool for the send. If the calls those sends create are hitting voicemail after-hours, a 30-min call is the fastest way to see what your store is leaving on the table after each campaign.

The 3-layer guarantee.

1. Live in 14 days or it's free until launched.
2. 65% resolution in 90 days or we refund the last 3 months of subscription fees.
3. We keep working free until we hit 65%.

Ruben (Ringly co-founder) takes these calls personally.

Book a 30-min call →