A feature flag is a simple idea: wrap a new piece of code in an if-statement that a dashboard controls, instead of your deploy pipeline. That means you can ship a risky change to 1% of users, roll it back instantly if something breaks, or turn a feature on for one customer without redeploying anything. What used to be a homemade if-statement has become its own category of hosted platforms, ranging from enterprise release-management suites to small self-hosted tools built for one specific stack. Here are 8 real feature flag and remote config tools from our catalogue.
FeatureFlags.app — privacy-first, built only for .NET
FeatureFlags.app is a brand-new entrant with a narrow, deliberate focus: teams building on .NET who want feature flags without sending any user analytics or session data to a third party. It plugs natively into Microsoft's own .NET feature management libraries and runs cloud-agnostically — Azure, AWS, GCP, or fully on-premises.
Pricing: Free to start ('Start Free' signup); no published pricing page or plan tiers as of writing.
Verdict: Worth watching if you're a .NET shop that cares specifically about not leaking usage data to a flagging vendor. It's a very early-stage product with no SDKs outside .NET and a much smaller track record than the established names below, so treat it as a bet rather than a safe default today.
LaunchDarkly — the category-defining enterprise platform
LaunchDarkly is the name most people think of first when they hear "feature flags." It's built for teams that need enterprise-grade reliability, with automated rollbacks tied directly to error monitoring, and an AgentControl product that extends flagging to AI agent behavior rather than just UI features.
Pricing: Developer tier is free (unlimited seats, 10M logs/traces, 5K session replays/month). Foundation tier is usage-based at $10/service/month or $8.33 per 1,000 client-side monthly active users. Enterprise pricing is custom.
Verdict: The safe default for teams that need proven reliability at scale, but the pricing and feature depth are aimed squarely at larger organizations — open-source alternatives like GrowthBook or Flagsmith will be considerably cheaper for simpler needs.
Statsig — flags plus a real experimentation platform
Statsig bundles feature flags with A/B testing, product analytics, and session replay into one genuinely unified system, built to answer not just whether a feature shipped, but whether it actually worked. It can run experiments directly against your existing Snowflake or BigQuery warehouse, and links session replays to specific experiments and metrics.
Pricing: Developer tier is free for up to 2M events/month. Pro is $150/month for 5M events. Enterprise pricing is custom with volume discounts.
Verdict: A strong pick if you want flags and experimentation to live in one tool rather than stitched together across two vendors. It's younger and less enterprise-battle-tested than LaunchDarkly, and much of its core platform is closed-source, which matters if open-source trust signals are part of your vendor evaluation.
GrowthBook — open source with a built-in stats engine
GrowthBook is open source and includes a built-in Bayesian statistical analysis engine for experiments, not just flag toggling. It's free for up to 3 users with unlimited feature flags and experiments, which makes it one of the more generous free tiers on this list.
Pricing: Free for up to 3 users; pricing for larger teams isn't clearly published.
Verdict: A genuinely strong option for small teams that want serious statistical rigor without an enterprise price tag, as long as you're comfortable self-hosting or accept the learning curve that comes with more advanced statistics.
ConfigCat — a generous free tier for smaller teams
ConfigCat positions itself as a developer-centric flag service with unlimited team size on every plan and a genuinely useful free tier: up to 10 flags, two environments, one product, and 5 million requests per month at no cost.
Pricing: Free up to 10 flags and 5M requests/month; paid plans scale from there.
Verdict: One of the easiest recommendations here for a small team or side project — the free tier alone covers a lot of real use cases. Advanced enterprise features are more limited than LaunchDarkly or Statsig, so fast-growing teams may outgrow it.
Flagsmith — deploy anywhere: hosted, private cloud, or on-prem
Flagsmith stands out on deployment flexibility: use its hosted API, deploy to your own private cloud, or run it fully on-premises, across web, mobile, and server-side applications.
Pricing: Free tier available; paid tiers for higher usage aren't clearly published on the catalogue listing.
Verdict: The obvious pick if self-hosting or data residency is a hard requirement for your organization. Some users report the interface takes longer to learn than more polished competitors like ConfigCat.
Flipt — self-hosted, git-native, no per-user fees
Flipt is fully self-hosted and designed to be "git-native" — flag state can live alongside your code rather than only in a hosted dashboard. It explicitly markets itself as a LaunchDarkly alternative, with simple pricing and no per-user charges.
Pricing: 14-day free trial, no credit card required; specific ongoing pricing isn't detailed on the listing.
Verdict: Worth a look for teams that want flag configuration to go through the same git-based review process as code changes. It's less known than the bigger names, so expect fewer public war stories and community answers when something goes wrong.
Featbit — free, open source, self-hosted, MIT-licensed
Featbit calls itself an "enterprise-grade" feature flag platform that you fully self-host, released under the permissive MIT license, with integrations aimed at AI-era workflows.
Pricing: Free, but self-hosting (your own infrastructure and ops effort) is required.
Verdict: A solid choice if you want zero licensing cost and full control, and you already have the DevOps capacity to run and maintain it yourself. If you'd rather not manage another self-hosted service, a hosted option like ConfigCat will get you moving faster.
Side by side
| Tool | Price | Best for |
|---|---|---|
| FeatureFlags.app | Free (early stage) | .NET-only, privacy-first teams |
| LaunchDarkly | Free dev tier, usage-based paid | Enterprise-scale reliability |
| Statsig | Free up to 2M events, $150/mo Pro | Flags + experimentation in one tool |
| GrowthBook | Free up to 3 users | Open source with real statistics |
| ConfigCat | Free up to 10 flags / 5M req | Small teams, generous free tier |
| Flagsmith | Free tier + paid | Hosted, private cloud, or on-prem |
| Flipt | Free trial | Git-native, self-hosted flags |
| Featbit | Free (self-hosted) | Full control, zero license cost |
Which one should you pick?
If you're a small team or solo developer, ConfigCat's free tier or GrowthBook's free-for-3-users plan will cover most real needs without a credit card. If you need enterprise-grade reliability and are willing to pay for it, LaunchDarkly remains the safest bet, or Statsig if you also want experimentation and analytics unified in the same tool. If self-hosting and full data control matter more than convenience, Featbit and Flipt are both free and open source. And if you're specifically on .NET and privacy is a hard requirement, FeatureFlags.app is worth trying, with the caveat that it's a very young product.