Prompt
which feature flag platform is simplest for a legacy app
Latest observation
For a legacy app, the simplest feature-flag platform is usually the one that requires the least code change and can be adopted incrementally.
Best “simple” choices
- LaunchDarkly — easiest if you want a very polished product with strong SDKs, but it can be more expensive and heavier than you may need.
- Unleash — often the best balance for legacy systems: straightforward to self-host or use managed, easy rollout, and less vendor lock-in.
- ConfigCat — very simple to integrate, especially if you want a lightweight, hosted service with a clean UI.
If you want the absolute simplest path
Use a platform that lets you:
- Check flags in one place in your existing code
- Default safely if the service is down
- Start with a few toggles rather than replacing app logic
My recommendation
- Small team / want easy setup: ConfigCat
- Need enterprise-grade controls: LaunchDarkly
- Want open-source/self-hosted simplicity: Unleash
Legacy-app-specific advice
Pick something with:
- a simple HTTP/SDK integration
- no need to redesign your app architecture
- support for server-side evaluation
- environment separation (dev/staging/prod)
If you tell me your stack (Java, .NET, PHP, Rails, etc.) and whether you want self-hosted vs SaaS, I can recommend the simplest option more precisely.
Observation history
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