alt Hacker NewsHi HN, I'm Ivar, creator of Unleash.
Unleash started in 2014 as an internal tool at my company at the time, because we wanted to ship to production continuously without big-bang releases. It's an Open-Source feature flag platform with SDKs for >25 languages.
A few design choices that might be interesting:
- Local evaluation: server-side SDKs fetch the flag config and evaluate in-process, so user data never leaves your app and a flag check is a memory lookup, not a network call.
- Shared Rust engine (Yggdrasil): the evaluation logic is written once in Rust and embedded in the SDKs, so behaviour is the same across languages.
- Unleash Edge: a Rust proxy/cache for frontend and edge clients at scale. (Commercial)
- OpenFeature: supported if you don't want to lock into our SDKs.
I can see using something mature if you are starting from scratch.
if you already are in a platform capture situation, eg. Azure App Configuration or AWS AppConfig where you already integrate with platform tools using the native auth primitives, what is the benefit one can expect from switching to unleash?