Replace / VWO
Best free VWO alternatives (open source, self-hosted) 2026
The best open-source alternative to VWO is GrowthBook (or Unleash) with PostHog, self-hosted on Railway. Experiments you host. GrowthBook is MIT core (skip enterprise/) — Optimizely without the experiment seat.
Estimated save $2,400 a year.
Open the stackStart on Railway
How VWO compares
| VWO | GrowthBook | |
|---|---|---|
| Pricing model | Hosted subscription | Open-source or fair-code license; you pay the host |
| Hosting | Vendor cloud | Self-hosted on Railway or any VPS |
| Rough monthly cost | Public list price not verified this run | Hosting only — no SaaS seat meter in this repo |
- GrowthBook
MIT core flags and experiments (skip enterprise/) — the published Optimizely path
- Unleash
AGPL-3.0 feature flags if the job is a toggle, not an experiment
- PostHog
Product analytics with experiments next to funnels
FAQ
- What is the best free open-source VWO alternative?
- The best open-source alternative to VWO is GrowthBook (or Unleash) with PostHog, self-hosted on Railway. Experiments you host. GrowthBook is MIT core (skip enterprise/) — Optimizely without the experiment seat.
- Is it free?
- The GrowthBook licenses are open source or fair-code. You still pay hosting (Railway or any VPS) and any APIs the stack calls. There is no VWO seat or task bill on this path.
- Can I migrate from VWO?
- Yes. Start with the workflows or data you actually use, then cut over. The GrowthBook stack page has the agent prompt and the cost table; most teams rebuild the slice that matters and leave old VWO links until they expire.
- How do I deploy it?
- Open the GrowthBook stack, copy the agent prompt, and deploy on Railway (one service, PORT, and a volume when the app needs disk). Placeholder: GrowthBook (official docs) plus Mongo/Postgres as the project documents. Persist the database. No one-click template in this repo yet — Start on Railway. Feature flags without an experiment UI stay on /stacks/unleash-flags.
- What does this replace?
- Optimizely / VWO. The published small-team estimate on this stack is $2,400 a year.
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