Feature Flags / Remote Config
Flags SDK is free and open source while Convert runs on paid subscription pricing. Convert: A/B testing and personalization platform with no-cookie tracking and privacy-first architecture. Flags SDK: Free open-source Vercel library for Next.js and SvelteKit feature flags. Framework-native, provider-agnostic with adapters for LaunchDarkly, Statsig, Optimizely, Hypertune, ConfigCat, DevCycle and Flipt. Convert fits gradual rollouts to reduce risk. Flags SDK fits Next.js/SvelteKit teams integrating existing flag SaaS cleanly. On our rubric Convert scores 3/5 for developer experience and 4/5 for transparency, while Flags SDK scores 5/5 and 5/5. The honest trade-off: Convert's main drawback — Solo developer shipping to production; Flags SDK's — Only a client/framework layer; you still need a provider. For Flags SDK: Framework-native for Next.js and SvelteKit. Convert is explicitly not the right pick for solo projects. Flags SDK is not aimed at Non-Vercel stacks or teams needing the provider itself. Another Convert advantage: Kill switches for features. Another Flags SDK advantage: Provider-agnostic with adapters for major flag SaaS.
Quick take
Convert is for gradual rollouts to reduce risk; Flags SDK is for Next.js/SvelteKit teams integrating existing flag SaaS cleanly; decide on pricing model.
| | | |
|---|---|---|
| Category | Feature Flags / Remote Config | Feature Flags / Remote Config |
| Pricing Model | subscription | free |
| Entry Price | $599/mo | — |
| Free Tier | No | Yes |
| Billing Complexity | — | — |
| Developer Experience | 3/5 | 5/5 |
| Pricing Transparency | 4/5 | 5/5 |
| Lock-in Level | medium | low |
| Migration Complexity | — | — |
| Data Portability | — | — |
| Enterprise | Available | — |
| GitHub Stars | 16.5k | 586 |
| License | AGPL-3.0 | MIT |
Choose Convert if gradual rollouts to reduce risk, and if you'd rather pay for a managed service than run infrastructure yourself.
Not for: Solo projects
Choose Flags SDK if Next.js/SvelteKit teams integrating existing flag SaaS cleanly, and if you want to avoid recurring license costs and are willing to self-host.
Not for: Non-Vercel stacks or teams needing the provider itself
Check each tool's dedicated page for deeper reviews, setup notes, and pros/cons.
No: Flags SDK is free and open source, while Convert runs on paid subscription pricing. Convert may still be cheaper in total cost once you factor in hosting, maintenance, and engineering time to run Flags SDK yourself.
Moving to Flags SDK is reasonable on its side — it's low lock-in (OSS provider-agnostic flags SDK). The friction is on the way out of Convert, which is medium lock-in (A/B test data exportable). Budget time for data export and integration rework.
Flags SDK scores higher in our rubric (5/5 vs 3/5 for Convert). Transparency is 5/5 for Flags SDK and 4/5 for Convert. DX scores are rubric-based, not benchmarks, so evaluate against your own toolchain.
They sit in the same category, so yes — Flags SDK is a plausible alternative for many Convert use cases. It fits best when Next.js/SvelteKit teams integrating existing flag SaaS cleanly. Skip it if Non-Vercel stacks or teams needing the provider itself.
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