A feature flag is basically a remote on/off switch for a piece of your code. Instead of shipping a new feature straight to every user and hoping nothing breaks, you wrap it in a flag, turn it on for 1% of traffic, watch what happens, then dial it up (or instantly kill it) without redeploying anything. LaunchDarkly more or less invented this as a business and is still the name most people think of first. But it's built and priced for large engineering orgs, and a lot of teams — especially smaller ones, or ones that just want to self-host the thing — end up looking for something lighter. Here are 7 real alternatives, pulled from actual product listings, not marketing copy.
The short version: if you want the closest thing to LaunchDarkly's polish with a genuinely usable free tier, look at Statsig or GrowthBook. If you'd rather self-host and never think about per-seat pricing again, Flagsmith, Flipt or Featbit are all real, MIT/open-source-licensed options with Docker images. If you're a small team that just wants flags without a sales call, ConfigCat is the straightforward pick, and Unleash sits in between as an enterprise-grade option you can also run yourself.
Why teams look past LaunchDarkly
LaunchDarkly's free "Developer" tier is genuinely generous — unlimited seats, 10M logs/traces a month. The trouble starts once you're past that: paid usage is billed per service per month or per 1,000 client-side monthly active users, and enterprise features (deeper audit logs, SSO, custom roles) push you into custom-quote territory fast. For a startup or a mid-size team running a handful of services, that bill can climb well past what a feature-flag toggle feels like it should cost. It's also a hosted-only product — there's no self-hosted option if your company has data-residency or compliance rules that require it.
1. Statsig — flags, experiments and analytics in one place
Statsig bundles feature flags, A/B testing, product analytics and session replay into a single platform, built around the question "did this feature actually work", not just "did it ship". It runs experiments directly against your existing Snowflake or BigQuery warehouse, and links session replays to the specific experiment and metric that triggered them — useful when a flag rollout causes a weird support ticket and you want to see exactly what the user saw. Free tier covers 2M events/month; Pro starts at $150/month for 5M events.
Good fit if: you want flags and experimentation analytics unified instead of stitched together from two tools. Watch out for: it's younger and less enterprise-battle-tested than LaunchDarkly, and the core repos are largely private, so the open-source trust signal is thinner than the fully open options below.
2. GrowthBook — open source, with a real statistics engine
GrowthBook is open source and free for up to 3 users, with unlimited feature flags and experiments even on the free tier. What sets it apart is a built-in Bayesian statistical analysis engine for A/B tests — it's aimed at teams that actually want to reason about experiment significance, not just flip a switch.
Good fit if: you run real experiments and want the stats handled properly without paying for a separate analytics tool. Watch out for: pricing for larger teams isn't published, and there's a learning curve if you're new to experimentation concepts.
3. Flagsmith — hosted, private cloud, or fully on-prem
Flagsmith gives you three deployment choices: its hosted API, your own private cloud, or fully on-premise. That flexibility matters for regulated industries or companies that simply don't want a third party holding their flag configuration. It has a free tier and is one of the more mature open-source options in this list.
Good fit if: you need on-prem or private-cloud deployment as a hard requirement. Watch out for: the interface has more moving parts than the simpler tools here, and pricing past the free tier isn't clearly published.
4. Flipt — self-hosted, git-native, built to replace LaunchDarkly directly
Flipt markets itself explicitly as a LaunchDarkly alternative: self-hosted, git-native flag management with support for multiple data backends, released under GPL-3.0 with the source on GitHub. There's no per-user fee structure to worry about — you run it yourself on Docker or Kubernetes.
Good fit if: you want flag state to live in git alongside your code, and you're comfortable operating your own infrastructure. Watch out for: smaller community and far fewer public case studies than the hosted competitors.
5. Featbit — self-hosted, built for the AI-agent era
Featbit is a free, self-hostable, enterprise-grade feature flag platform (MIT-licensed, Docker/Kubernetes-ready) that specifically markets integration with AI tooling as part of its pitch. Like Flipt, there's no seat-based bill — you host it, you control it.
Good fit if: you want a modern, actively-developed open-source option and don't mind running the infrastructure. Watch out for: less brand recognition than Flagsmith or Unleash, and documentation can be uneven in places.
6. ConfigCat — the straightforward, no-drama option
ConfigCat doesn't try to be an experimentation platform — it's a feature flag service, full stop, with unlimited team size even on paid tiers and a free plan covering 10 flags, two environments and 5 million requests a month. Support is frequently cited as excellent for a tool at this price point.
Good fit if: you just want flags to work without learning a new platform. Watch out for: it doesn't try to match LaunchDarkly's more advanced targeting and rollout features, and costs can rise once you're past the free tier's limits.
7. Unleash — the enterprise-grade middle ground
Unleash positions itself for larger companies that want an evolvable, secure feature management platform — it's one of the few tools here that's both open source at its core and taken seriously at enterprise scale, which is why LaunchDarkly itself lists it as a direct alternative.
Good fit if: you're an enterprise that wants the option to self-host without giving up polish. Watch out for: like several tools on this list, detailed pricing isn't public — expect a sales conversation.
Side-by-side
| Tool | Deployment | Free tier | Best for |
|---|---|---|---|
| Statsig | Hosted | 2M events/mo | Flags + experimentation + analytics in one |
| GrowthBook | Open source, hosted or self-hosted | Unlimited flags, 3 users | Teams that run real statistical experiments |
| Flagsmith | Hosted, private cloud, or on-prem | Yes | Regulated teams needing deployment choice |
| Flipt | Self-hosted (GPL-3.0) | Free, self-hosted | Git-native flag workflows |
| Featbit | Self-hosted (MIT) | Free, self-hosted | AI-tooling-aware self-hosted setups |
| ConfigCat | Hosted | 10 flags, 5M requests/mo | Simple flag toggling, no extras |
| Unleash | Open source, enterprise-ready | Yes | Larger orgs wanting self-host + polish |
None of these fully replicate everything LaunchDarkly does — its automated rollback tied to error monitoring and its newer AI-agent flagging (AgentControl) are hard to match. But for the common case — turning features on and off safely without an enterprise contract — several of these cover it for free or a fraction of the cost. If you're not sure where to start: self-hosted and comfortable with Docker, try Flipt or Featbit; want a hosted product with a real free tier, try GrowthBook or ConfigCat; need experimentation analytics baked in, try Statsig.