ConfigCat

Overview

ConfigCat is a hosted feature-flag and configuration service for teams that want to control software behavior after deployment. It suits developers who need targeting and staged rollouts across several kinds of applications. Its broad SDK coverage and unlimited seats make collaboration straightforward, but download and traffic quotas—not team size—set the practical ceiling on each plan.

Teams can target users and segments, roll out changes by percentage, run A/B tests, and use variations. That range makes ConfigCat useful for controlled releases; teams seeking a service without metered configuration downloads or network traffic should weigh the plan caps carefully.

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

Key features

Targeting and release controls

Targeting rules, user segments, percentage rollouts, A/B testing, and variations cover both selective access and gradual exposure. An audit log and approval workflows help teams track and govern changes. The combination is a strong fit for teams managing releases across user groups, though the service’s quotas still matter as configuration traffic grows.

SDKs and integrations

Open-source SDKs span mobile, desktop, web, and backend environments. Supported options include JavaScript, Angular, React, Node.js, Deno, Bun, Cloudflare Worker, .NET, Java, Go, PHP, Python, Android Java, iOS Swift, Dart, Flutter, Kotlin Multiplatform, Ruby, Elixir, C++, Rust, and Unreal Engine. This breadth suits mixed technology stacks and reduces the need to limit evaluation to one application type.

Integrations include Amplitude, Bitbucket, CircleCI, Datadog, GitHub, GitLab, Jira, Slack, Terraform, and Zapier. A CLI scans source code for flag usage, with a report warning about likely unused flags; that is useful for teams trying to avoid leaving obsolete switches behind.

Security and governance

ConfigCat says SDKs evaluate flags 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. The company states it is ISO/IEC 27001:2022 certified and offers EU-only data governance. Support runs through chat or email with the development team and a community Slack; plan support ranges from best effort to premium SLA.

Pricing

Every listed plan has unlimited seats, service connections, monthly active users and contexts, and feature-flag reads. The meaningful usage limits are config JSON downloads and network traffic, so high request volume can matter even when audience size or team size does not.

Forever Free is a sensible starting point for small projects, but its 10-flag, two-environment allowance and traffic caps constrain broader use. Pro raises those limits and is the entry paid tier for teams that can work within 100 flags and three environments. Smart is the first listed tier with unlimited flags and environments, while Enterprise adds substantially higher quotas and premium SLA support. Dedicated is aimed at workloads needing the largest stated quotas and a private-cloud deployment; its price is a substantial step up from Enterprise.

Platforms

ConfigCat supports Android, iOS, macOS, web, API, extensions, and self-hosted deployments. Its SDK range across backend, web, mobile, and desktop makes it suitable for teams controlling features in more than one application environment.

Who it's for

ConfigCat is best suited to software teams that want post-deployment control, broad SDK coverage, and structured targeting without per-seat limits. The free tier can support a small evaluation or modest use; teams with heavier configuration traffic should choose a paid tier based on download and network quotas. It is less compelling for buyers whose primary concern is avoiding usage-based ceilings.

Pros and cons

• Pros: Unlimited seats, connections, monthly active users, contexts, and flag reads across plans keep team and audience growth from directly changing those allowances.
• Pros: Open-source SDKs cover a wide selection of languages and application types, supporting mixed stacks.
• Pros: Targeting, segments, percentage rollouts, A/B testing, approvals, and audit logging support controlled releases and change oversight.
• Cons: Even the free plan is capped at 5 million config JSON downloads and 20 GB of traffic per month; usage growth can require a paid tier.
• Cons: The free plan is limited to 10 flags, two environments, and two products, while Pro still caps flags at 100.
• Cons: Smart begins at $325 a month for unlimited flags and environments, and Dedicated costs $4,500 a month.

Alternatives

Flagsmith is worth considering for teams prioritizing an open-source core under a BSD-3 licence; it also offers a free plan and free trial.

Flipt may suit teams that want Git-native workflows and Git synchronization in its free Open Source plan, alongside unlimited feature flags.

feat offers a free plan with 7,500 MAU, 100 server connections, two projects, and unlimited environments and flags, making it an option for readers comparing a defined free allowance.

Featureflow has a free-forever plan with up to five seats, one project, two environments, 1 million SDK requests per month, and a seven-day audit trail; it may fit a small team comfortable with those limits.

DevCycle sets specific free-plan quotas for client-side MAUs and cloud and server config requests, a useful comparison for buyers who want those limits stated directly.

GrowthBook offers an open-source self-hosted plan with one project, unlimited flags, experiments, and traffic, so it is a candidate for teams favoring self-hosting.

LaunchDarkly Experimentation has a free Developer plan with experimentation MAU, projects, environments, service connections, and experimentation features; compare it if experimentation is the main need.

Rollgate offers a free plan with unlimited flags, three environments, three projects, three seats, 500K requests per month, and all 12 SDKs; its stated price is free.

Verdict

Choose ConfigCat if your team needs broad SDK coverage, precise rollout controls, and unlimited seats, with plan quotas that can accommodate your expected configuration traffic. Its main advantage is the combination of targeting, release governance, and support across many development environments. Look elsewhere if you need unlimited downloads and traffic or want a lower-cost paid tier with unlimited flags and environments.