Replane is described as 'Open-source, self-hosted platform for feature flags and dynamic configuration. It lets teams change feature toggles, rate limits, and app settings in real-time without redeploying code—updates propagate to connected services in under a second via Server-Sent Events' and is an app. There are more than 25 alternatives to Replane for a variety of platforms, including Web-based, SaaS, Self-Hosted, JavaScript and Python apps. The best Replane alternative is LaunchDarkly. It's not free, so if you're looking for a free alternative, you could try DevCycle or Flagsmith. Other great apps like Replane are ConfigCat, Unleash, Optimizely and Split.