ConfigCat

ConfigCat is a hosted feature flag and configuration management service for controlling features after code has been deployed. It supports user targeting, percentage rollouts, A/B testing, and variations. Open-source SDKs cover mobile, desktop, web, and backend applications, with languages including JavaScript, .NET, Android Java, iOS Swift, Kotlin Multiplatform, Python, Go, and Rust. Listed integrations include Amplitude, Bitbucket, CircleCI, Datadog, GitHub, GitLab, Jira, Slack, Terraform, and Zapier. ConfigCat says flags are evaluated client-side, customer 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 list unlimited seats, service connections, monthly active users, contexts, and feature flag reads, but set limits for config JSON downloads and network traffic. A CLI scans source code for flag usage and reports likely unused flags. The Forever Free plan costs nothing; paid plans start with Pro at $110 a month.

ConfigCat provides feature controls across a range of application environments, with usage limits on downloads and traffic. Review the relevant plan limits and support level for your deployment.

ConfigCat suits development teams that need to manage feature access and rollout behavior across applications. Its SDKs cover mobile, desktop, web, and backend environments.

ConfigCat is a hosted feature-flag and configuration service for teams that need to change application behavior after deployment. It suits developers coordinating releases across multiple environments and platforms. Its targeting and rollout controls are broad, while download and traffic quotas—not seats or flag reads—are the limits to watch.

Overview

ConfigCat lets teams control features in deployed software, using targeting rules, user segments, percentage rollouts, A/B testing, and variations. That makes it a practical choice for staging changes or limiting exposure without making every adjustment a new deployment. An audit log and approval workflows also support teams that need a record and review process for configuration changes.

The product officially started in 2018 and is headquartered in Budapest, Hungary. ConfigCat uses a freemium model, with paid plans starting at $110 per month.

Compare it with our Feature Flag Software and Release Management Software lists.

Key features

Release controls and technical debt

Targeting, segments, and percentage rollouts give teams options for deciding who sees a change and how quickly exposure grows. A/B testing and variations extend that control to comparing experiences. These tools are useful when releases need to be selective or gradual; they do not remove the need to monitor plan quotas as configuration downloads and traffic increase.

A CLI scans source code for flag usage, and a report warns about likely unused flags. That can help teams spot potential flag cleanup work rather than letting old controls accumulate unnoticed.

SDKs, integrations, and security

Open-source SDKs cover mobile, desktop, web, and backend applications, with language and framework options including JavaScript, Angular, React, Node.js, .NET, Java, Go, Python, Android, iOS, Flutter, and Rust. This breadth suits teams deploying across different application stacks. Integrations include Amplitude, Bitbucket, CircleCI, Datadog, GitHub, GitLab, Jira, Slack, Terraform, and Zapier.

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. The company states that it is ISO/IEC 27001:2022 certified and offers EU-only data governance. Support includes chat or email with its development team and a community Slack; plan support ranges from best effort to premium SLA.

Pricing

All listed plans include unlimited seats, service connections, monthly active users and contexts, and feature flag reads. The metered items are config JSON downloads and network traffic, so growing usage can make the higher tiers relevant even when team size does not change.

Forever Free is a reasonable starting point for small deployments: its 10 flags, two environments, and two products are clear constraints, though the included download and traffic allowances are substantial. Pro raises the caps to 100 flags and three environments for teams that have outgrown those restrictions. Smart removes flag and environment caps and increases download and traffic allowances, but still limits products to 10. Enterprise keeps flags and environments unlimited, raises the usage allowances again, and adds premium SLA support. Dedicated is the highest-priced choice for organizations needing a private cloud, hosted or on-premise; it is the tier aimed at the largest stated download and traffic volumes.

Platforms

ConfigCat supports Android, iOS, macOS, web, API, extensions, and self-hosted deployments. Its SDK range spans client and server technologies, making it suitable for teams managing flags across more than one application type. Dedicated specifically offers hosted or on-premise deployment options.

Who it's for

ConfigCat is best suited to development teams that need controlled rollouts across several platforms, value unlimited seats, and can match a plan to their expected configuration-download and network-traffic volume. Its targeting, audit log, approval workflows, and cleanup-oriented CLI also fit teams that want governance around feature changes. It is less compelling for buyers whose priority is minimizing usage-based limits or who need more than 10 products on Smart; those teams should compare the higher tiers against their deployment needs.

Pros and cons

• Pros: Unlimited seats, service connections, monthly active users and contexts, and feature flag reads across all listed plans keep those dimensions from setting plan ceilings.
• Pros: Targeting, segments, percentage rollouts, A/B testing, variations, audit logs, and approval workflows provide a substantial set of release and governance controls.
• Pros: Open-source SDKs cover a wide range of languages and application environments, and the CLI report can flag likely unused configuration switches.
• Cons: The free plan is capped at 10 flags, two environments, and two products, which may constrain teams managing multiple applications or release stages.
• Cons: Downloads and network traffic have limits on every plan, so the unlimited seats and flag reads do not mean unlimited overall usage.
• Cons: Smart is still capped at 10 products, while premium SLA support is reserved for Enterprise.

Alternatives

Consider feat if its free plan's 7,500 MAU, 100 server connections, two projects, unlimited environments, and unlimited flags better match a smaller deployment; it uses a different set of stated free-plan limits. Featureflow is another freemium option with a free trial and a free tier limited to five seats, one project, two environments, one million SDK requests per month, and a seven-day audit trail.

Flagsmith may suit teams prioritizing an open-source core, which its maker says is mostly under the BSD-3 licence. Bucketeer is a free, open-source, self-hosted option with no per-seat pricing. DevCycle is another freemium alternative, with Android, API, extension, iOS, and web support.

Featurevisor is a free self-hosted option under the MIT License with no per-seat pricing. GO Feature Flag offers an open-source plan for own infrastructure with unlimited flags and community support only. GrowthBook offers a self-hosted open-source plan with one project, unlimited feature flags, unlimited experiments, and unlimited traffic.

Verdict

Choose ConfigCat if your team needs feature controls across varied application stacks, wants broad rollout and governance tools, and can work within its download and traffic limits. Its unlimited seats, usage dimensions, and substantial SDK coverage are strong advantages. Look elsewhere if those quotas or Smart's product cap do not fit your deployment, or if you need premium SLA support without moving to Enterprise.