ConfigCat
Bootstrapped feature-flag service with flat, predictable pricing and open-source SDKs.
About
ConfigCat is a feature-flag and configuration management service founded in 2018 in Budapest, Hungary. It lets teams turn features on and off after deployment, target user segments by region, email, subscription, or custom attributes, and run percentage rollouts and A/B tests without redeploying.
The pitch is simplicity and predictable cost: the free tier includes all features (10 flags, 2 environments, unlimited seats), paid plans scale on flags and download volume rather than per-seat or per-user, and SDKs are open source across mobile, web, desktop, and backend stacks. Customers cited by the company include Microsoft, Nasdaq, and Rakuten. Third-party comparisons position it as the cheapest serious flag platform for teams that want flags only, noting it has no built-in analytics or experimentation surface beyond A/B variations.
What it can do
- Feature flags with on/off and percentage rollouts
- User targeting by attributes (region, email, subscription, custom)
- A/B testing with variations
- Open-source SDKs for web, mobile, desktop, and backend
- OpenFeature support; no vendor lock-in, export anytime
- SOC 2, ISO 27001, GDPR compliance
Setup
Sign up, create a config and feature flags in the dashboard, add an open-source SDK, and fetch flags by SDK key.
Prerequisites
None for the free tier (10 flags, 2 environments, 5M config JSON downloads).
Use cases
Works with
Trust score — 8/10
Scored 8/10 (VERIFIED tier, metrics-v1). Evidence: operating since 2018 from Budapest, named customers include Microsoft, Nasdaq, and Rakuten, SOC 2 / ISO 27001 / GDPR compliance documented. Strengths: genuinely free tier with all features, flat predictable pricing with unlimited seats, broad SDK coverage, OpenFeature support, and no vendor lock-in. Docked for: (1) flags-only scope with no analytics or full experimentation surface, so analytics-heavy teams need a second tool; (2) small bootstrapped vendor, which is a concentration risk for enterprise buyers; (3) proprietary hosted service, no self-host option. License: proprietary SaaS; SDKs are open source.
How the trust score is built
Full methodology →- Adoption · stars/downloads, log-scaled vs peers
- 8.0/10
- Maintenance · recency, releases, issue load
- 8.0/10
- Openness · license + docs
- 5.0/10
- Manual review · sanity read + red-flag check
- 8.0/10
- · Founded 2018, Budapest; bootstrapped and profitable per third-party analysis
- · Named customers: Microsoft, Nasdaq, Rakuten
- · SOC 2, ISO 27001, GDPR compliant
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.