Best Feature Flag Services 2026
by Anonymous
Feature flag services enable teams to toggle features on and off without redeployment, supporting gradual rollouts, A/B testing, and kill switches for problematic features. The best platforms offer targeting rules based on user attributes, percentage-based rollouts, and real-time flag evaluation with minimal latency. Self-hosted options appeal to teams with strict data residency or security requirements.
LaunchDarkly
From $10/mo per seat
price
25+ server and client SDKs
sdk languages
User attributes, segments, custom
targeting rules
Yes, Experimentation add-on
a/b testing
Relay Proxy only
self-hosting
<10ms, local evaluation
evaluation latency
Unleash
Free open source, Pro $80/mo
price
15+ official SDKs
sdk languages
Strategies with constraints
targeting rules
Limited, variant support
a/b testing
Yes, Docker/npm
self-hosting
<10ms, client-side cache
evaluation latency
Flagsmith
Free open source, Cloud from $45/mo
price
15+ SDKs
sdk languages
User segments, traits
targeting rules
Yes, multivariate flags
a/b testing
Yes, Docker/Kubernetes
self-hosting
<20ms, edge evaluation
evaluation latency
Split
Free up to 10 flags, from $33/mo
price
15+ SDKs
sdk languages
User attributes, segments
targeting rules
Yes, built-in experimentation
a/b testing
No
self-hosting
<10ms, streaming updates
evaluation latency
Flipt
Free, open source
price
10+ SDKs, REST/gRPC
sdk languages
Segments, constraints
targeting rules
Variant support
a/b testing
Yes, single binary
self-hosting
<5ms, local evaluation
evaluation latency
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