ConfigCat vs Featurevisor

ConfigCat is a hosted feature flag and configuration management service for controlling features after code is deployed. Teams can target users, roll out changes by percentage, run A/B tests, and use variations. Open-source SDKs support mobile, desktop, website, and backend applications, with languages including JavaScript,.NET, Android Java, iOS Swift, Kotlin Multiplatform, Python, Go, and Rust. Listed integrations include GitHub, GitLab, Jira, Slack, Terraform, Datadog, and others. ConfigCat says flags are evaluated on the client, user data remains in the customer's system, and the service stores flag values and targeting rules; SDK keys are 256-bit and rotatable. It states that it is ISO/IEC 27001:2022 certified and offers EU-only data governance. Plans include unlimited seats, service connections, monthly active users, contexts, and feature flag reads, but limit config JSON downloads and network traffic. The Forever Free plan is free; Pro is $110 a month, billed monthly. Higher listed plans range from $325 a month to $4,500 a month.

Featurevisor is a Git-based tool for managing feature flags, experiments and remote configuration through YAML files in a Git repository. Teams build datafiles for each environment, deploy them and evaluate features through an SDK. Rules can target users in order, roll out a percentage and assign weighted experiment variations. Typed global and feature variables allow defaults and targeted overrides, with schemas validated during datafile builds. Applications fetch static JSON datafiles and evaluate flags locally in memory, without a network request for each decision; the datafiles are served from the customer’s own CDN. YAML test specifications can check expected behavior locally or in CI, with failed assertions returning a non-zero exit. Git pull requests and CI linting, tests and builds provide change control. Featurevisor is self-hosted and MIT-licensed. Its free plan is free, with no per-seat pricing or evaluation service to keep running. Listed platforms include Android, iOS, Linux, macOS, web and Windows.