Feature Flags

Why Self-Host Your Feature Flags?

Feature flag services like LaunchDarkly, Split, and Statsig charge based on monthly tracked users or seats, which can reach thousands of dollars per month for applications with significant traffic. Every feature evaluation request sent to a third-party service also introduces external latency into your application’s critical path and creates a dependency on an external API that, if it goes down, can affect your entire product’s behavior. Self-hosting your feature flag infrastructure eliminates both the cost scaling problem and the availability risk.

Self-hosted feature flag platforms provide the same core capabilities — boolean flags, percentage rollouts, user targeting, A/B testing, and gradual rollouts — while keeping all evaluation logic within your own infrastructure. Flag evaluations happen locally with zero network overhead, and your targeting rules, user segments, and experiment data never leave your servers. This matters for applications handling sensitive user data where even metadata about which features specific users see could be considered private information.

The operational benefits extend beyond cost and privacy. With self-hosted flags, you can integrate directly with your existing deployment pipeline, customize evaluation logic for your specific needs, and maintain flag state in your own database with your own backup and disaster recovery procedures. You avoid vendor lock-in on a system that becomes deeply embedded in your codebase — switching feature flag providers is notoriously painful once thousands of flag checks are distributed across your application.

Why Self-Host Your Feature Flags?

Feature flag services like LaunchDarkly, Split, and Statsig charge based on monthly tracked users or seats, and costs escalate rapidly once your application reaches meaningful scale. A team with 100K monthly active users can easily spend $1,000+ per month on a commercial feature flag service for what is essentially a configuration lookup. Self-hosted feature flag tools eliminate this variable cost entirely, letting you run unlimited flags for unlimited users on infrastructure you already pay for.

Latency is another practical reason to self-host. Every feature flag evaluation in a SaaS product requires either a network call to the provider’s API or reliance on their SDK’s local cache synchronization. Self-hosted solutions evaluate flags locally with zero network overhead, which matters for applications where flag checks happen on every request. When your feature flag service goes down — as has happened with major providers — a self-hosted instance keeps running because it depends only on your own infrastructure.

Self-hosted feature flags also remove a data exposure vector. Flag evaluation often involves sending user attributes (plan tier, geography, account age) to the flag provider for targeting rules. This means your user segmentation data flows to a third party on every request. Running your own feature flag service keeps targeting data entirely within your infrastructure, which simplifies compliance for applications handling regulated data.