Self-hosted feature flags that don't require a platform team. One Go binary, one SQLite file, SDKs for eight languages. Percentage rollouts, segment targeting, audit logs, and a LaunchDarkly-class UI — without the LaunchDarkly invoice.
Flag evaluation runs in-process via the SDK — no network round-trip on the hot path. The Gauge server is source-of-truth; the SDKs sync in the background.
Go, Ruby, Python, Swift, Kotlin, TypeScript (Node + browser), Rust, Elixir. Generated from one spec, tested against one fixture suite.
0–100% with sticky-bucket hashing. A user at 10% stays in the 10% as you dial up to 20%. No jitter, no re-randomization.
Attribute-based rules: plan, country, cohort, anything you pass. JSON Logic under the hood — readable by the server, fast to evaluate.
Every change tracked. Who turned what on, when, from which IP. Exportable CSV. SOC2 folks get asked about this; now you have an answer.
Every flag has a "kill" state that skips the rollout logic entirely. Paged at 3am because of a bad flag? One click, instant off.
Flags are tiny. A million flag records fit in ~80MB on disk. SQLite is fast, reliable, and boring. If you truly need Postgres — and you don't — there's a driver swap in v2.
Fewer features, no per-MAU bill, you run the box. If you need experimentation (A/B, stats, etc.) Statsig is better. If you need feature-flagging, Gauge.
Not from us. We do offer a managed deploy setup on fly.io for $10/month if you want "self-hosted but not by me." Ask after purchase.
Exactly what was on the tin. No upsells, no tier gates, no "contact us for pricing" once I was in. Shipped in an afternoon and the docs were readable by a human.
I've bought half the catalogue at this point. The voice is consistent, the prices are honest, and the updates actually land. It's what indie shipping should look like.
Did what the page said it would do. Knocked off half a star because I wish there was a Windows native build — I'm on WSL and it works but feels like a workaround. Support replied to me in four hours.
I bought it at 11pm, downloaded it at 11:01pm, had it running at midnight. That's the whole review. Email went to a person who answered the next morning.
The amount of thought in the copy alone makes this worth the price. And that's before you get to the actual product. Rare to see this level of care at indie prices.
Swapped out my previous tool for this one last sprint. Fewer features, honestly — but the ones that are here are the ones I actually use. Don't miss the rest.