The verdict in three sentences
Bubble remains the right choice as long as your vertical SaaS has fewer than 500 active users, its key pages respond in under 1.5 s and the platform costs less than 2% of monthly revenue. Switching pays off when three signals stack up: response times above 3 s, deals lost for lack of SSO, API or data export, and a funding round planned within 6 to 12 months. A rewrite in Next.js and PostgreSQL costs between EUR 40,000 and 90,000 excluding VAT in 2026 and usually pays back in 14 to 24 months.
What Bubble costs as the SaaS grows
Bubble's Team plan lists at USD 349 per month, but the real bill depends on the workload units consumed by your workflows, searches and API calls. 2026 estimates for a typical vertical SaaS:
| Active users | Bubble plan | Subscription | Additional workload units | Monthly platform bill |
|---|---|---|---|---|
| 50 | Growth | USD 119 | none | about USD 120 |
| 250 | Team | USD 349 | USD 100 to 200 | USD 450 to 550 |
| 500 | Team | USD 349 | USD 300 to 600 | USD 650 to 950 |
| 1,000 | Team or Enterprise | USD 349 or custom | USD 800 to 1,500 | USD 1,150 to 2,000 and up |
| 2,000 | Enterprise | custom | included per contract | USD 2,500 to 4,000, rough estimate |
On top comes the human cost: a freelance Bubble developer in France charges EUR 400 to 600 per day, and every workaround (plugin, external API call, scheduled workflow) adds to maintenance.
The tipping-point grid
| Criterion | Stay on Bubble | Warning zone | Switch |
|---|---|---|---|
| Key page response time | under 1.5 s | 1.5 to 3 s | over 3 s |
| Platform cost as share of monthly revenue | under 2% | 2 to 5% | over 5% |
| Workaround workflows | under 10 | 10 to 25 | over 25 |
| Deals lost (SSO, API, export, EU hosting) | none | 1 to 2 per quarter | 3 or more per quarter |
| Active users | under 300 | 300 to 500 | over 500 |
| Fundraising | not within 18 months | in 12 to 18 months | technical due diligence within 6 months |
The valuation criterion is often underestimated: a fund investing EUR 1 to 3 million will ask who owns the code, how data is isolated and what scaling costs. A Bubble app is not an absolute blocker, but it opens a discussion about a discount.
The cost of a Next.js and PostgreSQL rewrite
| Item | Low range | High range | Duration |
|---|---|---|---|
| Audit of the Bubble app and data model | EUR 3,000 | EUR 6,000 | 1 to 2 weeks |
| Design rework and design system | EUR 4,000 | EUR 9,000 | 2 to 3 weeks |
| Next.js, API and roles development | EUR 22,000 | EUR 52,000 | 6 to 12 weeks |
| Data and user account migration | EUR 4,000 | EUR 9,000 | 1 to 2 weeks |
| Testing, parallel run, cut-over | EUR 7,000 | EUR 14,000 | 2 to 3 weeks |
| Total excl. VAT | EUR 40,000 | EUR 90,000 | 12 to 20 weeks |
The method that limits risk: rewrite module by module behind a shared API, keep Bubble read-only for 2 to 4 weeks and migrate customers in waves of 10 to 20. Avoid the big-bang weekend cut-over.
Mini case study
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Julien, founder of a practice-management SaaS for veterinary clinics in Lyon, has 80 customers at EUR 150 per month, i.e. EUR 12,000 of monthly revenue and 620 users. Platform, Bubble freelancer and workarounds cost him EUR 4,000 per month. After a EUR 60,000 rewrite, maintenance drops to EUR 2,000 per month, saving EUR 24,000 per year. SSO and accounting export unlock 3 clinic groups at EUR 600 per month, i.e. EUR 21,600 of extra annual revenue. Total gain: EUR 45,600 per year, payback in 16 months.
FAQ
Can we keep Bubble for the back office and code the rest?
Yes, it is a common intermediate step. Moving the busiest customer flows out costs EUR 15,000 to 30,000, but you pay for two stacks for 6 to 12 months.
Is Bubble GDPR-compliant?
Bubble offers EU data hosting on some plans. Enterprise buyers often require a detailed data processing agreement and precise data location, which are easier to guarantee with hosting you control.
Why Next.js and PostgreSQL rather than another stack?
The pair combines a large developer pool, sub-second key pages and hosting costs of EUR 50 to 300 per month for a few thousand users.
Will the rewrite cost us customers?
With a wave-based migration and 2 to 4 weeks of parallel running, churn usually stays below 2%. The risk comes mostly from unannounced UX changes.
When should we definitely not rewrite?
Before finding product-market fit. Under 30 paying customers or with monthly churn above 5%, invest in the product on Bubble first.
Let's scope your project. Send us your user count, your Bubble bill and your sales blockers: we will cost the audit, the module-by-module rewrite and the migration schedule. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.