ConfigCat

What Is ConfigCat?

ConfigCat is a hosted feature flag and remote configuration service that lets a team switch features on or off without redeploying code. Picture a four-person SaaS team that wants to ship a new checkout flow to 5% of users on Friday. It needs a toggle, a rollout percentage and a kill switch, and it does not want a per-seat bill for the product manager who flips the switch.

That scenario explains the company's design. ConfigCat Kft. is based in Budapest and registered in Hungary's company register under number 01-09-352162. The founders began building the product in 2018 and registered the Kft. in 2019. They describe the company as fully bootstrapped, and a Startup Hungary event in February 2025 repeated that description. Some aggregator sites list outside funding, but we found no primary source for it, so we do not repeat those claims.

The team is small. Hungarian register data puts it at 10 to 19 employees, and 2025 revenue at roughly HUF 493 million, about €1.25 million. For buyers, that means a vendor with no investor pressure and a short chain of command. It also means fewer account managers than LaunchDarkly or Split.

Where Flagsmith leans on self-hosting and Unleash on open-source governance, ConfigCat sells simplicity. You get a dashboard, 30+ SDKs and flat plan pricing. Nothing here requires running your own infrastructure.

Key Features

Targeting, Rollouts and Scheduling

Flags can be targeted by region, email, subscription tier or any custom attribute you pass from your code. Percentage rollouts let you expose a feature to a slice of users first. Changes can be scheduled, and every environment (for example staging and production) keeps its own values. These are the basics, and ConfigCat executes them cleanly without a heavy learning curve.

Client-Side Evaluation

ConfigCat's SDKs download a config file and evaluate rules inside your application. User attributes therefore stay in your system, and the service never receives them. The company states this plainly on its homepage. For privacy teams, it is a stronger design than services that evaluate rules on a vendor server with user context attached.

SDKs, Proxy and Integrations

ConfigCat publishes 30+ open-source SDKs covering JavaScript, Python, Go, Java, iOS, Android, Flutter and more. Both the SDKs and the ConfigCat Proxy carry MIT licences. A relay through your own network is possible via the Proxy. Integrations cover Slack, Datadog, Jira, GitHub Actions, CircleCI, Terraform, Zapier, Segment and Amplitude, among 20+ listed on the homepage.

Zombie Flag Cleanup

Old flags rot. ConfigCat ships a code scanner CLI that finds flag references in your repository, so you can see which flags nobody uses anymore. It is a small feature with real day-to-day value.

Experimentation Is Basic

ConfigCat supports A/B testing only by sending flag variations to your own analytics tool, such as Amplitude or Segment. It has no built-in statistics engine for significance or confidence intervals. Teams that want that inside the flag tool should look at Kameleoon or AB Smartly instead.

Support and Reliability

Plans carry published uptime targets: 99% on the free plan, 99.9% on Pro, 99.95% on Smart and 99.99% from Enterprise upward. Support runs through email, a community Slack and GitHub. For paid support tiers, the pricing page lists an SLA of a meaningful answer by the end of the next business day, while the free plan gets best-effort help with no support SLA. A public status page tracks service health. Premium support begins at the Enterprise plan, so smaller teams rely on the documentation and community.

Pricing

ConfigCat's pricing is flat per plan, and all plans include unlimited seats. The Forever Free plan costs $0 and allows 10 flags, 2 environments, 2 products and 5 million config downloads a month. Pro costs $110 a month for 100 flags and 25 million downloads. Smart costs $325 for unlimited flags and 250 million downloads.

Enterprise costs $900 a month with 1 billion downloads. Dedicated costs $4,500 and adds a private cloud option. Annual billing saves up to 10%. Prices are listed in USD, and the site also offers EUR and GBP.

The criticism is the staircase. A team that outgrows 10 flags jumps from $0 to $110, and a team that needs unlimited flags jumps to $325. There is no middle option. Flagsmith's Start-Up plan at $45 sits in that gap, though it counts requests rather than downloads and caps team members on its free tier.

Small teams with a modest flag count get a generous free plan because seats never cost extra. If you run dozens of services, compare the Smart plan against LaunchDarkly's seat-based invoice. The LaunchDarkly alternatives page lists other European options.

EU Compliance & Privacy

ConfigCat is an EU company, but its EU hosting story needs reading carefully. The data processing agreement states that processing happens exclusively in EU or EEA member states unless otherwise agreed. According to the terms, the service is operated from Hungary. ISO 27001:2022 certification is listed too.

The nuance sits in delivery. By default, config files are served from a global CDN on Cloudflare's edge network, with geo-based load balancing. An EU Only mode publishes files exclusively to EU-based nodes. Only organisation admins can switch it on, and you must set the matching dataGovernance option in every SDK. If you forget, requests can be slower.

We set the EU-hosted flag to true because the DPA and the EU Only option both exist. It is not the default, though. The documentation also does not say whether the dashboard itself follows the setting.

Sub-processors include several US companies: AWS, Cloudflare, DigitalOcean, Sentry, Mailgun and Chargebee. Stripe Payments Europe and a Hungarian invoicing firm are the European ones. Because the SDK evaluates rules locally, the amount of personal data that reaches ConfigCat is small. Even so, a cautious data protection officer will want to read the sub-processor list.

Who It's Best For

Small product teams who want flags and remote config without per-seat fees. If five people need dashboard access, ConfigCat does not charge more for the fifth.

EU companies with a strict data brief. If your legal team requires European-only delivery, enable EU Only mode on day one and test the SDK setting in staging.

Teams replacing LaunchDarkly for cost reasons. If you use flags for rollouts and kill switches rather than statistical experiments, ConfigCat covers the need at a fraction of the price.

Not for self-hosters. Anyone needing the entire platform on their own servers under an open-source licence should choose Flagsmith or Unleash. If you run heavy experimentation programmes, choose a dedicated experimentation platform.

The Verdict

ConfigCat is a focused feature flag service from a founder-run Hungarian company. Unlimited seats, 30+ MIT-licensed SDKs and client-side evaluation make it easy to adopt and easy to defend to a privacy officer. The trade-offs are real: experimentation is basic, the service is proprietary, the default delivery path is global rather than European, and plan jumps are steep. For flag management with EU delivery enabled, it earns a solid recommendation.

Frequently Asked Questions

Is ConfigCat GDPR compliant?

ConfigCat Kft. is a Hungarian company registered in Budapest, and its data processing agreement says processing happens exclusively inside the EU or EEA unless agreed otherwise. The company lists ISO 27001:2022 certification. Its sub-processor list still includes US firms such as AWS, Cloudflare and Sentry, so review the DPA with your own counsel before relying on it.

Where is ConfigCat data hosted?

By default, flag configuration files are served from a global CDN built on Cloudflare's edge network. An EU Only data governance setting, restricted to organisation admins, publishes them only to EU-based nodes; you must also set the matching dataGovernance option in each SDK. The documentation does not say whether the dashboard itself is affected by that setting.

Is ConfigCat open source or self-hostable?

Partly. Both the SDKs and the ConfigCat Proxy are MIT-licensed on GitHub. Proprietary code covers the dashboard and managed service, and there is no free self-hosted edition. On-premise deployment is offered on higher paid plans, and the Dedicated plan includes a private cloud option.

How much does ConfigCat cost?

The Forever Free plan costs $0 and includes 10 flags and 5 million config downloads a month. Paid plans are Pro at $110, Smart at $325, Enterprise at $900 and Dedicated at $4,500 per month, with up to 10% off for annual billing. All plans include unlimited seats. EUR and GBP pricing can be selected on the pricing page.

How does ConfigCat compare to LaunchDarkly?

ConfigCat is cheaper at small scale, with flat plan pricing and unlimited seats, and it contracts from Budapest. LaunchDarkly is a US company with deeper built-in experimentation and a larger enterprise feature set. Choose ConfigCat for straightforward flags and remote config; choose LaunchDarkly if you need integrated experiment statistics.