status: active
timestamp: 2026-06-20
tags: [feature-flags, ab-testing, config, primary]
Hypertune
Type-safe feature flags + A/B testing + typed config, Git-style version control
Hypertune
Role
Feature flags, A/B tests, and typed runtime config across the family. Type-safe SDK means flag and config keys become TypeScript types, so a typo at the call site is a compile error. Synchronous in-memory local flag evaluation means flag reads have no network cost on the hot path.
Free tier
- Unlimited feature flags
- Unlimited A/B tests
- 5 team members
- Type-safe SDK with full TypeScript types
- Git-style version control (branches, diffs, history) on flag config
- Synchronous in-memory local flag evaluation
- Unlimited environments
Card / subscription required?
NO. Sign-up via GitHub or email. No payment method required for the free tier.
Alternatives
- LaunchDarkly (paid only — rejected)
- PostHog feature flags (already in stack)
- Statsig (free tier exists)
- GrowthBook (open source, but self-host violates the no-selfhost rule)
- Unleash (open source, same issue)
Swap cost
Medium — flag-key surface is hidden behind a thin internal helper, but the type-safe codegen ties tightly to Hypertune’s CLI. Swapping would mean regenerating types from another provider and rewiring evaluation.
Why this is our pick
Three things competitors don’t do together: typed flags as a compiled
artifact, in-memory synchronous evaluation (no await flag()), and
Git-style branching on the flag config itself. PostHog’s flags are
fine for product analytics integration but lack the type generation;
LaunchDarkly is paid-only.
Cross-refs
- API umbrella Hono Worker architecture
- Use pnpm rule
- PostHog — product analytics, not the primary flag store
- No card-on-file rule