If you're researching how to replatform from Magento, your math has probably stopped working. Maybe it's the agency retainer that keeps creeping up. Maybe it's the quarterly patch that took out three extensions last cycle. Maybe Adobe just emailed a renewal quote that doesn't fit any reasonable spreadsheet.

You're not alone. Magento lost about 15% of its live store base year-over-year heading into Q1 2026 (per Store Leads). The merchants leaving aren't picking the same destination, either. Some land on Shopify Plus. Some go BigCommerce. A handful stay on Adobe Commerce Cloud and modernize. A few build headless. And a surprising number stay put on Magento, fix their stack, and save the migration cost.

This guide walks through all of it. We'll cover when to leave, where to go, what it really costs, how long it takes, what transfers, what breaks, and the support-spike risk almost nobody warns you about. The goal: help you pick the destination that fits your team and your TCO, not the destination your agency happens to sell.

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Why merchants are replatforming from Magento in 2026

The Magento story is no longer one big trend line. It's four overlapping pressures that hit any given merchant at slightly different times.

The cost line keeps moving. Adobe Commerce Cloud licenses run $40K to $200K+ per year, and total cost of ownership lands two to three times the license once you add hosting, agency time, and extensions. According to Shopify's enterprise benchmark, a typical three-year run on Adobe Commerce comes in between $225K and $975K, while the same window on Shopify Plus lands between $123K and $285K. That's roughly a 42% platform-cost premium on average.

The security workload keeps growing. A critical remote code execution vulnerability hit Magento and Adobe Commerce stores in late 2025. Within hours, more than 250 stores were compromised. Six weeks after the patch dropped, 62% of affected stores still hadn't applied it. If you're tracking your DevOps time, you already feel this.

The talent pool keeps shrinking. Certified Magento developers are harder to hire than they were three years ago. Junior engineers don't pick Magento as their first platform. Agencies are quietly closing their Magento practices. None of that means Magento is dead, but it does mean hiring costs and time-to-fix are both creeping up.

Competing platforms keep closing native gaps. Shopify Plus shipped 150+ updates in its Winter 2026 edition, including the kind of B2B price-list and multi-currency handling that used to be a Magento moat. BigCommerce's Enterprise tier ships unlimited API calls and native price-list logic. The features-only argument for Magento gets thinner each quarter.

If you're seeing two or three of those pressures at once, it's worth running the actual replatform math. If you're only seeing one, staying might still be cheaper.

5 signals you've outgrown Magento (and 3 signals you haven't)

Most "should I replatform" content is written by agencies that get paid to replatform. Here's a more honest read.

You've probably outgrown Magento if:

• DevOps is bigger than feature work: your full-time technical spend is split 70/30 maintenance versus new builds. You can name the last three things you didn't ship because the patch cycle ate the sprint.
• Patches break extensions every quarter: each quarterly security release costs you two to four weeks of cleanup. Your extension vendors are slow to update or have gone quiet.
• Hosting plus agency is over $80K/year: combined annual run-rate at that level justifies a one-time $100-200K migration in 12 to 18 months. The math gets easier above $150K/year.
• Conversion is capped by the checkout: your checkout conversion has flatlined while DTC peers on SaaS platforms are pulling ahead 5-10%. Shopify's conversion edge over Adobe Commerce sits around 5% per their own checkout benchmarks.
• You're still on Magento 1: you're past EOL by more than five years. PCI auditors are increasingly refusing to certify Magento 1 stores at all.

You should think twice about leaving if:

• You're on Magento 2.4.6 or newer with a stable agency: your upgrade path is clean, your devs are reliable, and patching is routine. The cost to migrate may not beat the cost to stay.
• Your custom logic is real moat: heavy B2B pricing rules, niche tax or regulatory code, complex catalog logic that took years to tune. Reimplementing on Shopify or BigCommerce will cost more than people quote.
• You're approaching a sale, refinance, or major round: a six-month replatform mid-due-diligence is one of the riskier moves a founder can make. Wait until the deal closes.

If you're firmly in "should leave" territory, the next question is where you actually go.

Your 4 realistic destination options

Most Magento merchants in 2026 end up choosing between four destinations. Here's the side-by-side.

Choose Shopify Plus if you want the fastest time to launch, the cleanest TCO math, the largest app ecosystem (16,000+ apps versus Magento's 5,700), and your team is small. This is where most Magento Open Source merchants under $50M GMV end up. Read our full Magento to Shopify Plus playbook if you're already leaning this direction. The Shopify Plus pricing breakdown has more detail on real all-in costs.

Choose BigCommerce Enterprise if you have complex catalogs, deep B2B requirements that need native price lists, and you want unlimited API calls without surcharges. BigCommerce is the middle ground: more flexible than Shopify, easier than Magento.

Choose Adobe Commerce Cloud if you're enterprise with multi-brand, multi-region, multi-warehouse needs and you're already deep in the Adobe Experience Cloud ecosystem (AEM, Workfront, Target). It's a real platform, just expensive.

Choose headless if you have a 5+ person engineering team that wants total UX control, your conversion rate gain from custom storefronts is worth the ongoing burn, and you can sustain a $200K+/year platform engineering payroll. For most stores, this is overkill.

Honest take: most merchants leaving Magento Open Source land on Shopify Plus. Not because it's perfect, but because the TCO math is hardest to argue with and the launch timeline is the most predictable.

True 3-year TCO across destinations

Here's the math nobody wants to publish, in actual numbers.

A few things worth flagging:

The Shopify Plus all-in monthly tends to land somewhere between $4K and $10K once apps, theme work, and integrations are running. That's where the Shopify Plus pricing breakdown really matters: the platform fee is the smallest line on the bill.

Adobe Commerce Cloud's "starter" prices are misleading. The $40K/year license is the floor, and most mid-market builds end up in the $122K to $450K annual range once GMV-tied pricing kicks in. There's no public pricing page, and every deal is custom.

Headless looks expensive because it actually is, once you count the platform engineering team you'll need to keep it running. One published case study cited a $300K Shopify Plus migration with a payback under five weeks and a $25M+ annual profit lift. That's the top end. Most stores don't see numbers like that. Build your case on conservative assumptions.

If your current Magento run-rate exceeds $80K/year combined (hosting plus agency), a migration usually pays back in 12 to 18 months. Below that, the math gets harder.

Realistic timeline by complexity tier

Migration timelines lie in two directions: agencies low-ball to win the deal, and worst-case stories get amplified online. Here are the honest tiers.

Self-service tier (under 2K SKUs, no B2B, payment-only integration): 4 to 8 weeks. You're doing a theme rebuild, basic data import via Matrixify or Cart2Cart, URL redirects, and a couple of weeks of testing. This is the only tier where DIY makes sense.

Mid-market tier (2K-50K SKUs, light ERP, 1-2 third-party integrations): 3 to 6 months. Custom theme, deeper data mapping, multi-system integration testing, real load testing before launch. Most Magento Open Source merchants going to Shopify Plus or BigCommerce fall here.

Enterprise tier (50K+ SKUs, full ERP+PIM+OMS+B2B+multi-region): 6 to 12 months. Sometimes 18 months if you're going headless. The longest pole is rarely the technical work. It's contract negotiation, B2B price-list cleanup, and stakeholder alignment.

The most common timeline failure is the "agency 12-week trap." Agencies pitch 12 weeks to win the project, then hit data anomalies, B2B price-list edge cases, or ERP integration testing problems and ship in week 24. Add 30-50% buffer to whatever the agency quotes. Make it contractual if you can.

Adobe Commerce Cloud migrations average 12-18 months realistically. A lot of that is just the contract.

What actually transfers (and what doesn't)

This is where most cost overruns hide. Here's the honest split.

What transfers cleanly:

• Products: SKU, title, description, basic attributes, images, inventory. Tools like Matrixify and LitExtension handle this.
• Customers: name, email, addresses, basic order history. Passwords never transfer. Customers reset on first visit.
• Orders: historical order data, line items, totals, status. Read-only on the new platform usually.
• Basic SEO data: title tags, meta descriptions, canonical settings (if you map them deliberately).

What doesn't transfer cleanly:

• EAV custom attributes: Magento's entity-attribute-value model has no direct Shopify equivalent. Plan for metafield mapping work, by attribute.
• Layered navigation rules: filter logic on Magento doesn't map one-to-one to Shopify tags or BigCommerce facets. Rebuild from scratch.
• B2B price lists and tiered pricing: rebuild in Shopify B2B, BigCommerce Price Lists, or Adobe Commerce B2B module. Plan for QA on every customer group.
• Custom checkout extensions: rebuild on Shopify Checkout Extensibility, BigCommerce's checkout SDK, or whatever your destination supports. Few have direct alternatives.
• CMS static blocks: manual rebuild. There's no automated path.
• Complex tax and regulatory custom code: review every rule. Mistakes here are expensive after launch.
• Stored payment tokens: PCI-compliant tokenization usually doesn't transfer between gateways. Customers re-enter card data on first checkout.

The tools that help: Matrixify, LitExtension, Cart2Cart, Shopify's Transporter app, and BigCommerce's built-in importer. None of them solve the EAV problem or the B2B price-list problem. Those are project work, not import work.

The SEO preservation playbook

This is the section where one missed step costs six figures in lost revenue. Read it twice.

The rule: 1:1 URL mapping is non-negotiable. Skip it and you lose 30-50% of organic traffic for three to six months. Practical Ecommerce documents this pattern across dozens of failed migrations. Even with good redirects, expect a 15-25% traffic dip in weeks 2-4 before recovery. The dip is normal. The cliff is not.

Here's the 7-step playbook:

• Crawl your Magento site first: full URL inventory with Screaming Frog or Sitebulb before you touch anything. Export to CSV. This is your source of truth.
• Map every URL to its new equivalent: products, categories, CMS pages, paginated URLs, filtered URLs. Every single one. Tag the ones with no equivalent (you'll redirect those to category or homepage).
• Implement 301 redirects on day one: not week three. Use the new platform's redirect manager: Shopify's URL Redirect Manager, BigCommerce's 301 manager, or Adobe Commerce's URL Rewrites tool. Bulk upload the entire CSV.
• Preserve metadata: title tags, meta descriptions, image alt-text, and H1/H2 structure. Map every field. Don't rewrite metadata as part of the migration. Do it later.
• Submit an updated XML sitemap on launch day: push it to Google Search Console and Bing Webmaster Tools immediately. Same with your robots.txt.
• Monitor crawl errors daily for 30 days: GSC Coverage report is your dashboard. Any spike in 404s gets fixed within 24 hours.
• One change at a time: never combine the replatform with a redesign or content rewrite. Recovery slows by a factor of 2-3x when you bundle changes. Replatform first, redesign in month four.

If you skip just one of those, you'll spend the next six months explaining traffic loss to the rest of the team. Skip none.

Try Ringly.io free for 14 days if you're heading toward Shopify Plus and want to absorb the post-migration support spike with an AI phone agent from day one.

The support-spike risk nobody warns you about

This is the section other replatform guides skip, and it's the one that catches finance teams off guard.

When you replatform, your inbound support volume spikes 30-50% for two to six weeks. URL changes, login changes, checkout changes, order-tracking page changes. Confused customers default to calling, especially the ones who don't read email confirmations.

The common ticket and call themes after a replatform:

• "Where is my order?" because the tracking page moved.
• "My login doesn't work" because passwords didn't transfer.
• "I can't find my saved cards" because tokens didn't transfer.
• "Why does the checkout look different?" because it does.

What teams should plan for:

• A pre-launch email campaign: tell customers what's changing 14 days before cutover, then 48 hours before, then on launch day. Include the new help URL and a phone number.
• A status page during cutover: real-time updates if anything breaks. Your customer support team will thank you.
• Beefed-up support coverage for 30 days: 1.5-2x normal staffing on phone and email. If you're a small team, this is where AI absorbs the volume.
• An AI phone layer for WISMO calls and login resets: AI phone agents can resolve 70%+ of these specific question types automatically, which is exactly the type of volume that spikes during cutover.

If you're landing on Shopify Plus, Ringly.io is one of the fastest ways to install an AI phone layer for the cutover period. Seth, our AI phone support agent, looks up orders in Shopify, processes returns, answers product questions, and escalates to a human when needed. Setup takes about three minutes and the resolution rate is around 73% on common ecommerce calls.

Specifically helpful during migration: Seth handles WISMO automatically, walks customers through new login flows, and covers after-hours coverage while your human team is firefighting the launch. The ecommerce call center playbook has more on how stores combine human and AI coverage post-launch.

8 mistakes that quietly cost six figures

Most replatforms fail in small, expensive ways. These are the ones to actually plan around.

• Launching without 1:1 URL maps: the single most common SEO disaster. Costs an average store somewhere between $50K and $500K in lost revenue depending on size.
• Combining replatform with redesign: doubles the risk and triples the recovery time. Replatform first, redesign in month four.
• Underestimating customer support volume: 30-50% inbound spike is normal. Plan staffing for it or install an AI phone layer.
• Letting the old agency hold data hostage: get full database exports in your possession before signing the new agency contract. Especially product images and order history.
• Skipping the dual-running period: keep Magento read-only for 30 days for order lookup. Customer support will need it.
• Forgetting payment gateway tokens: stored card data rarely transfers between gateways. Customers re-enter on first purchase. Plan messaging.
• Migrating dirty data: clean before exporting. Bad SKUs, broken product images, missing meta descriptions. Clean it in Magento, then import.
• No post-launch monitoring plan: 90-day plan is mandatory. Daily for the first month, weekly for months two and three.

If you do exactly one thing from this list, do the URL mapping. The rest are recoverable. SEO loss compounds.

The 90-day post-launch operating plan

Most teams celebrate at launch and stop paying attention. The first 90 days is where the value actually lands.

Days 1-30: daily review. Daily GSC crawl-error check. Daily checkout funnel monitoring. Weekly conversion-rate comparison versus pre-migration baseline. Hold Magento read-only for the entire window. Keep your support team at 1.5-2x staffing. Watch your customer service response times closely. Spikes here predict churn.

Days 31-60: weekly review. Cohort analysis: do migrated customers convert at the same rate as new customers? Identify the top three friction points (search, checkout, account login are most common) and fix them. Begin retiring the Magento read-only instance if traffic is stable.

Days 61-90: monthly review. Re-enable redesign and content updates if needed. Begin app-stack consolidation. Audit which apps you actually use versus which are draining the bill. Run a churn analysis specifically on customers who silently dropped off post-migration. If you're on Shopify, our Shopify customer service app and Shopify Plus customer service guides cover the operating model that works for post-launch teams.

By day 90 you should know: is the new platform delivering on the TCO promise, is your team faster or slower, and where do you go next on roadmap.

When to stay and modernize Magento instead

Almost nobody writes this section, which is exactly why it's worth covering.

If you're on Magento 2.4.6 or newer with a stable agency, a clean upgrade path, and a hosting bill under $5K/month, staying might be cheaper than leaving. The "modernize on Magento" play:

• Upgrade to the current Magento 2.4.x patch level: gets you out of the security backlog.
• Move to managed Magento hosting: providers like Hypernode, MGT-Commerce, or Cloudways take infrastructure off your team.
• Lock down your extensions to a small audited set: every extension is a future upgrade tax.
• Negotiate the agency retainer: most Magento agencies will trim 15-25% off retainer if you commit to a 12-month contract.

Staying makes sense if your custom logic is real moat, your team is happy, and your costs are predictable. It stops making sense the moment patches start eating sprints, hosting bills creep above $10K/month, or you're still on Magento 1.

There's no shame in modernizing rather than migrating. Pick the cheaper math.

Frequently asked questions

How much does it cost to replatform from Magento? Migration projects range from $20K for a small Shopify Plus self-service migration to $700K+ for a custom headless rebuild. Most mid-market Magento merchants going to Shopify Plus or BigCommerce land in the $60K-$180K range. The platform fees and app stack are separate ongoing costs.

How long does a Magento replatform take? Self-service migrations (under 2K SKUs) take 4-8 weeks. Mid-market migrations (2K-50K SKUs with light ERP) take 3-6 months. Enterprise migrations with B2B, multi-region, and full ERP integration run 6-12 months, sometimes 18 if you're going headless. Add 30-50% buffer to whatever the agency quotes.

Will I lose SEO when I leave Magento? You'll see a 15-25% traffic dip in weeks 2-4 even with perfect 1:1 URL redirects, then recovery to baseline by month 3-4. If you skip redirects, expect a 30-50% drop that takes six months or longer to recover from. Map every URL before launch.

What happens to my customer data and order history? Customer profiles (name, email, addresses) and order history transfer cleanly with tools like Matrixify or LitExtension. Passwords don't transfer for security reasons, so customers get a one-time reset on first visit. Stored payment tokens usually don't transfer between gateways either.

Is Shopify Plus or Adobe Commerce Cloud cheaper? On 3-year TCO, Shopify Plus typically runs $123K-$285K versus Adobe Commerce Cloud at $225K-$975K, per Shopify enterprise data. Adobe Commerce Cloud's GMV-tied pricing means costs scale with revenue, while Shopify Plus pricing is more predictable. For most mid-market stores, Shopify Plus is meaningfully cheaper.

Can I migrate Magento extensions to Shopify or BigCommerce? No, not directly. Magento extensions have to be replaced with native features or third-party apps from the destination platform's app store. Plan to rebuild your app stack, not migrate it. Shopify has roughly 16,000 apps versus Magento's 5,700, so the destination coverage is usually better.

Do I need a new app stack on Shopify Plus or BigCommerce? Yes. Plan to rebuild your app stack rather than migrate it. The good news is the best AI tools for Shopify and the broader Shopify app ecosystem cover most Magento extension use cases natively or with cheaper alternatives.

How do I handle phone support during the cutover? Expect a 30-50% inbound support volume spike for 2-6 weeks post-launch, mostly WISMO and login-reset calls. Either staff up 1.5-2x for 30 days or install an AI phone agent like Ringly.io that absorbs WISMO automatically. The ecommerce phone support guide walks through the operating model.

The takeaway

The replatform-from-Magento decision is rarely about the platform. It's about whether your team can keep shipping features faster than the patch cycle eats them. If yes, modernize on Magento. If no, the destination that fits most teams is Shopify Plus, with BigCommerce as the strong second choice for catalog-heavy or B2B-native stores.

Skip the temptation to rebuild on headless unless you have the engineering bench to support it for years. And skip the temptation to combine replatform with redesign. The 90-day window after launch is where most of the value or damage lands. Plan for it.

If you're already heading toward Shopify Plus and want to absorb the cutover support spike from day one, Ringly.io gets Seth answering your phones in about three minutes. Start your free 14-day trial and let the AI handle WISMO while your team stabilizes the launch.