AI app migration — Lovable, Bolt, Base44,
and Replit onto a stack you own.
Fixed-fee AI app migration for teams outgrowing Lovable, Bolt, Replit, Base44, or v0. We run a Lovable-to-Next.js migration, a Bolt-to-Vercel migration, a Base44 export migration, or a move off Replit with zero data loss and under ten minutes of downtime.
AI app migration moves your Lovable, Bolt, Replit, Base44, or v0 app off the builder onto a stack you own — usually Next.js plus managed Postgres — with zero data loss and minutes of downtime. URLs, Stripe subscriptions, auth sessions, and SEO are all preserved. Small apps run 2 to 3 weeks from $9,999; complex migrations with integrations and warehouse data run 4 to 8 weeks, fixed fee after a 48-hour audit.
Symptoms AI app migration fixes
Eight signals that tell us a migration pays for itself. If your stack hits three or more, the builder has become the tax — not the accelerator.
| Symptom | Root cause inside the builder | How AI app migration fixes it |
|---|---|---|
| Lovable credits spiraling past $2k/mo | Per-edit pricing hits a ceiling once the app has 20+ screens | Lovable-to-Next.js migration onto a stack with flat hosting cost |
| Bolt preview works, Vercel deploy 500s | Bolt's StackBlitz runtime differs from Node on Vercel — env, filesystem, and import paths all drift | Bolt-to-Vercel migration with real env var wiring and a working `next build` |
| Base44 can't do SSO or multi-tenant reporting | Feature ceiling — Base44's builder locks data model and auth model | Base44 export migration onto Next.js with Clerk/Auth.js SSO and a schema you can extend |
| Replit DB crawls past 1,000 users | Single-file Flask/Node sprawl + SQLite or Replit DB has no pooling, no indexes | Move off Replit onto managed Postgres with connection pooling and hot-query indexes |
| v0 frontend is beautiful, backend doesn't exist | v0 generates UI only — no DB, no auth, no payments, no deploy pipeline | v0 migration that adds Supabase/Neon, Clerk, Stripe, and a real CI pipeline without losing the UI |
| Acquirer asked to see the repo | Builder-hosted apps fail engineering due diligence — no git history, no tests, no migrations | Migration onto GitHub with commit history, test coverage, migrations checked in, and SOC2-ready logs |
| Handing off to a full-time team | AI-built codebases are hard to onboard — no types, no structure, no docs | Migration to Next.js + Postgres with TypeScript, folder conventions, and a week-one onboarding doc |
| Performance crashes past 100 concurrent users | Builder default infra has no pooling, no caching, no background jobs, no CDN rules | Migration onto infrastructure tuned for your traffic — pooler, CDN, queue, monitoring |
Five-phase Lovable-to-Next.js migration schedule
Every migration runs the same five phases. The Bolt-to-Vercel migration, the Base44 export migration, and the move off Replit all share this shape — only the source tooling changes.
- D148h · audit
48-hour migration audit
We map the current Lovable, Bolt, Replit, Base44, or v0 stack, inventory every table and integration, score complexity, and return a fixed-fee plan with a realistic cutover window. Fixed $1,500, rolled into the engagement.
- D2W1
Parallel-build the target stack
We build the Next.js App Router codebase (or your chosen target) alongside the existing builder app. Nothing touches production yet — everything is testable in staging before a single user moves.
- D3W2
Dry-run the data migration twice
We replicate production data into the new stack at least twice, with integrity checks on every table. Customer IDs, Stripe subscription IDs, user sessions, and file storage all validated end-to-end against the source.
- D4cutover night
Cutover during a low-traffic window
DNS flips, short maintenance window (typically under 10 minutes), traffic moves. The old stack stays live as rollback for 30 days. Users notice only that performance improved.
- D5W3–W8
Post-cutover monitoring and handoff
We watch Sentry, logs, and conversion funnels for 7 days after cutover. Any surprise gets fixed immediately. Handoff runbook delivered before we leave.
- D148h · audit
48-hour migration audit
We map the current Lovable, Bolt, Replit, Base44, or v0 stack, inventory every table and integration, score complexity, and return a fixed-fee plan with a realistic cutover window. Fixed $1,500, rolled into the engagement.
- D2W1
Parallel-build the target stack
We build the Next.js App Router codebase (or your chosen target) alongside the existing builder app. Nothing touches production yet — everything is testable in staging before a single user moves.
- D3W2
Dry-run the data migration twice
We replicate production data into the new stack at least twice, with integrity checks on every table. Customer IDs, Stripe subscription IDs, user sessions, and file storage all validated end-to-end against the source.
- D4cutover night
Cutover during a low-traffic window
DNS flips, short maintenance window (typically under 10 minutes), traffic moves. The old stack stays live as rollback for 30 days. Users notice only that performance improved.
- D5W3–W8
Post-cutover monitoring and handoff
We watch Sentry, logs, and conversion funnels for 7 days after cutover. Any surprise gets fixed immediately. Handoff runbook delivered before we leave.
What a Lovable-to-Next.js migration actually ships
The diff below is the single most common file we replace on a Lovable export: a client-side Supabase fetch with the anon key in the browser, migrated to a Server Component with the service-role key held server-side and RLS scoped by session.
01// BEFORE — src/pages/dashboard.jsx (Lovable export)02// Client-side fetch. Supabase anon key in browser. No types.03import { supabase } from '../lib/supabaseClient'04import { useEffect, useState } from 'react'05 06export default function Dashboard() {07 const [invoices, setInvoices] = useState([])08 useEffect(() => {09 supabase10 .from('invoices')11 .select('*')12 .then(({ data }) => setInvoices(data || []))13 }, [])14 return <InvoiceTable rows={invoices} />15}16 17// AFTER — src/app/(dashboard)/invoices/page.tsx (Next.js App Router)18// Server Component. Service-role key stays on the server.19// RLS scoped by user session. Fully typed. 301 from /dashboard.20import { createClient } from '@supabase/supabase-js'21import { cookies } from 'next/headers'22import { redirect } from 'next/navigation'23import type { Invoice } from '@/types/invoice'24import { InvoiceTable } from '@/components/invoice-table'25 26export const revalidate = 027 28export default async function InvoicesPage() {29 const session = await getSession(await cookies())30 if (!session) redirect('/login')31 32 const db = createClient(33 process.env.SUPABASE_URL!,34 process.env.SUPABASE_SERVICE_ROLE_KEY!,35 { auth: { persistSession: false } }36 )37 const { data, error } = await db38 .from('invoices')39 .select('id, amount, status, created_at')40 .eq('user_id', session.userId)41 .returns<Invoice[]>()42 43 if (error) throw error44 return <InvoiceTable rows={data ?? []} />45}What AI app migration engagements ship
Twelve deliverables cover the full migration surface. Price scales with data volume, integration count, and whether the target stack already exists.
- 0148-hour migration audit with a written risk assessment, data-loss model, and fixed-fee plan
- 02Lovable-to-Next.js source conversion preserving the App Router structure your next engineer expects
- 03Bolt-to-Vercel migration that re-homes the StackBlitz preview onto real GitHub + Vercel CI/CD
- 04Base44 export migration onto Next.js or your team's existing stack — SSO, RBAC, and custom reporting intact
- 05Replit export onto Fly, Railway, or Vercel with managed Postgres replacing Replit DB or SQLite
- 06Zero-loss database migration with two staging dry-runs, integrity checks, and a 30-day rollback window
- 07Supabase, Firebase, or Replit DB re-homed to managed Postgres (Neon, Supabase Pro, RDS) with pooling
- 08Auth session preservation — existing users stay logged in through the cutover, no forced re-auth
- 09URL preservation via 301 redirects, canonical rewrites, and sitemap handover to Google Search Console
- 10Stripe subscription continuity — customer IDs, subscription IDs, invoices, and webhooks all move intact
- 11CI/CD pipeline on GitHub Actions with preview deploys, branch protection, and tested rollback
- 12Handoff runbook so your next engineer owns the migrated stack without re-hiring us
Fixed-fee migration pricing
48-hour audit sets the exact number. Nothing bills hourly after that. The old stack stays warm for 30 days as rollback insurance — included.
“They ran our Lovable-to-Next.js migration in 11 days. Ten minutes of downtime at 3am. We haven't thought about Lovable since.”
- turnaround
- 2–8 weeks
- scope
- One source builder → one target stack. Data, auth, URLs, integrations preserved.
- guarantee
- zero data loss, sub-10-min cutover
AI app migration vs hourly dev vs full rewrite
| Dimension | Hourly contractor | Full rewrite | AI app migration |
|---|---|---|---|
| Cost | $15k–$60k open-ended | $80k–$250k+ | From $9,999, fixed |
| Timeline | Unknown, usually drifts | 3–6 months | 2–8 weeks |
| Data loss risk | Depends on the engineer | Medium — new schema often drifts | Zero · two staging dry-runs |
| URL preservation | Usually forgotten | Usually broken | 301s on every legacy path |
| Rollback plan | Rarely | Rarely | 30-day warm rollback included |
| Handoff quality | Unowned, undocumented | Strong, if the team lasts | Runbook + types + CI |
Pick AI app migration if
- →Your Lovable credits have passed $1.5k/mo and are still rising
- →Your Bolt-to-Vercel migration has failed twice and the preview still looks fine
- →Your Base44 export migration is blocked by a missing SSO or reporting feature
- →You need to move off Replit before next quarter's user spike
- →An acquirer, investor, or incoming CTO needs to see a git-hosted repo with tests
- →You need auth, Stripe, and data all preserved — no forced re-registration or re-subscribe
Don't pick AI app migration if
- →Your Lovable app is still under $500/mo in credits and under 500 users — stay put
- →You haven't decided on the target stack — we'll help in the free diagnostic first
- →You want a ground-up rewrite with new features — that's Finish My MVP, not migration
- →Your primary issue is a single broken Stripe or auth flow — use Integration Fix ($799)
- →You need a migration in under 10 days — our shortest shipped window is 14 days
- →The current app has no paying users and you'd rather rebuild cleanly — we'll say so
When Lovable-to-Next.js migration pays for itself
You're hitting pricing or feature ceilings on the builder. Lovable credits are spiraling, Replit's hosting costs more than managed infra, or Base44's SSO and multi-tenant limits are blocking an enterprise deal. AI app migration unlocks the ceiling. Users say they feel trapped, stuck, can't export, locked in — the fix is to get off before the next pricing change.
You're handing off to a full-time engineering team. AI builders generate code that's hard to onboard into. A migrated Next.js + Postgres codebase is something a senior engineer can read on day one. The handoff doesn't start with a rewrite quote.
You're preparing for due diligence or acquisition. Investors want to see a repo that can survive without the builder. Industry benchmarks — see our 2026 vibe-coding research — put AI-generated-code vulnerability rates close to half. The migration is also a security pass, because we audit RLS, webhooks, auth, and secrets on the way through.
You're outgrowing the builder's performance. Queries fine at 10 users crawl at 1,000. Connection pools exhaust. Background jobs don't exist. Migration lands you on infrastructure designed for the traffic you're about to have.
Migration engineers who run Lovable-to-Next.js cutovers
A migration is a framework move, a data move, and a hosting move. Each specialist owns one lane.
AI app migration questions we get every week
Why would I run an AI app migration off Lovable, Bolt, Replit, or Base44?
Four reasons come up. Pricing that escalates with scale (Lovable credits, Replit hosting). Lock-in when you want to hand off to a full-time team. Feature ceilings the builder can't clear — SSO, multi-tenant, custom reporting. Performance under load the builder's stack can't support. If none of those apply, stay on the builder — we'll say so honestly in the 48-hour audit.
Will users notice a Lovable-to-Next.js migration?
If we do it right, only that things got faster. Sessions persist — we preserve the Supabase JWT signing keys or mirror Clerk sessions. URLs resolve via 301 redirects on every legacy path. Stripe customer IDs and subscription IDs are preserved. The maintenance window is under 10 minutes, usually 3am in the lowest-traffic timezone.
Can you migrate only the database, keeping the frontend on Base44 or Lovable?
Yes. A common first step is moving the database to managed Postgres while the UI stays on the builder. The builder continues issuing client requests, but queries hit a real pooled Postgres with indexes and backups. This is the fastest way to get performance relief before a full migration — usually 1 to 2 weeks, $4,999 to $7,499.
What's the data-loss risk on a Replit-to-Vercel or Bolt-to-Vercel migration?
Zero, if the migration is done right. We replicate data at least twice into staging, run integrity checks on every table, and keep the old database live as rollback for 30 days post-cutover. Across 50+ migrations we haven't lost a row. Industry benchmarks find roughly half of AI-generated code contains vulnerabilities (see our 2026 research), but data migration itself is a mature discipline with predictable guardrails.
How long does AI app migration take and what does it cost?
Small apps (one domain, under 10k rows, straightforward auth): 2 to 3 weeks from $9,999. Medium apps (multiple integrations, Stripe subscriptions, tens of thousands of users): 4 to 6 weeks, $15k to $25k. Complex apps (multi-tenant, SSO, warehouse sync, custom reporting): 6 to 8 weeks, $25k+. Always fixed fee after the 48-hour audit.
Do you support migration to stacks other than Next.js?
Yes. Next.js + Postgres is the default because it's where most AI-built apps land comfortably, but we migrate to Remix, Nuxt, SvelteKit, or a custom Node/Python backend where it fits. Tell us what your future engineers will extend, and we target that.
Can you move us off Replit without losing the single-file Flask or Node app?
Yes. We keep the business logic, refactor the single-file sprawl into modules, replace Replit DB or SQLite with managed Postgres, add migrations and tests, and wire GitHub Actions CI. The app you had works; the app you have afterwards is one a senior engineer can extend.
What about SEO — will rankings drop after a Lovable-to-Next.js migration?
No, when the URL map is preserved. We 301 every legacy path, rebuild the sitemap, keep canonicals consistent, submit the new sitemap to Google Search Console, and monitor Search Console coverage for 30 days post-cutover. Migrations done this way typically show no ranking dip.
Related migration services
Outgrown your builder? Let's migrate.
Free 30-minute diagnostic, or book the 48-hour migration audit directly. Fixed-fee plan with cutover window follows.