What are open source feature flags?

Open source feature flags are a way for developers to wrap a section of code in a flag and toggle it on or off without needing to deploy new code. Feature flags give high control over deployments, with code transparency, global developer testing, and protection against vendor lock-in.

Flagsmith has a free plan for solo developers and getting started, with up to 50,000 API calls per month. This allows teams to try feature flags before choosing a paid plan and deployment option.

Can I add extra seats or API calls?

Yes, Flagsmith can provide additional team member seats and API calls. Teams should contact the company to arrange a custom pricing plan with adjusted limits.

DevOps & CI/CD · United Kingdom

Flagsmith

Open source feature flag management platform for developers

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Community votes: 0
DR by Ahrefs: 70 no change since last check

Ahrefs Domain Rating benchmarked 25 Oct 2026, rebuilt 25 Oct 2026.

Flagsmith metrics

Benchmarks for flagsmith.com: Ahrefs Domain Rating and Majestic link data, with the change since the last build.
Metric	Value
Domain Rating	70 no change since last check
Trust Flow	21 no change since last check
Citation Flow	43 no change since last check
Referring domains	1,639 no change since last check
External backlinks	301,711 no change since last check

Ahrefs Domain Rating benchmarked 25 Oct 2026, rebuilt 25 Oct 2026. Main build topic: Regional/Europe (19). Majestic benchmarked 25 Oct 2026, rebuilt 25 Oct 2026. Link data built by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

Flagsmith domain build sheet

Public RDAP record, last read 25 Oct 2026, 12:50 UTC.
Domain age	8 years
Registered	1 Mar 2018
Expires	1 Mar 2029
Registrar	NameCheap, Inc.
DNSSEC	Not signed

Inspect flagsmith.com's registration

Flagsmith is an open source feature flag and remote config platform that helps teams manage feature releases, run A/B tests, and control deployments across

What it is

Screenshot of the Flagsmith homepage — flagsmith.com, as visitors see it

Flagsmith is an open source feature flag service that helps development teams create, manage, and deploy feature flags across web, mobile, and server-side applications. The platform enables developers to wrap code sections with flags and toggle them on or off without redeploying, supporting practices like canary deployments, staged rollouts, and A/B testing.

Flagsmith offers powerful segmentation capabilities for individual users, user segments, and development environments. It includes remote config functionality for customizing feature values and visual elements, allowing teams to alter applications in real-time without code changes or app store approvals.

The company provides flexible deployment options: cloud hosting across eight regions, private cloud instances in any region, and self-hosted on-premises or in customer clouds. All feature flag changes are logged for auditing and easy rollback.

Built by developers who bootstrapped the company without venture capital, Flagsmith maintains its core feature flag functionality as open source under BSD-3 license while offering commercial tiers with team collaboration, governance, and enterprise features.

What it is built with

Feature flags across multiple platforms (web, mobile, server-side)
Granular segmentation by environment, user, or percentage
A/B and multivariate testing
Remote configuration and real-time updates
Change tracking and audit logs
User segments and traits
Staged rollouts with percentage-based deployment
SDK support for multiple languages
Role-based access and governance
Flexible deployment (cloud, private cloud, self-hosted)

Pricing

Pricing model: Freemium

Free: $0 (up to 50,000 API calls/month, 1 team member). Start-Up: $40/month yearly or $45/month (up to 1,000,000 API calls/month, 3 team members). Scale-Up: $250/month yearly or $300/month (5,000,000+ API calls/month, 5-20 team members). Enterprise: Contact Sales. Additional API calls: $50 per milli

See Flagsmith's full pricing (new tab)

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Questions from the bench

What are open source feature flags?: Open source feature flags are a way for developers to wrap a section of code in a flag and toggle it on or off without needing to deploy new code. Feature flags give high control over deployments, with code transparency, global developer testing, and protection against vendor lock-in.
Is Flagsmith free?: Flagsmith has a free plan for solo developers and getting started, with up to 50,000 API calls per month. This allows teams to try feature flags before choosing a paid plan and deployment option.
Can I add extra seats or API calls?: Yes, Flagsmith can provide additional team member seats and API calls. Teams should contact the company to arrange a custom pricing plan with adjusted limits.

Find Flagsmith online

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