Why Self-Hosted Feature Flags Matter in 2025

Cloud feature flag services are convenient. Sign up, get an SDK key, and you're shipping features in minutes. But convenience has costs that compound over time.

The Hidden Costs of Cloud Feature Flags

1. Pricing That Scales Against You

Most cloud feature flag services charge per Monthly Active User (MAU) or per seat. As your product grows, so does your bill. A startup with 10,000 users might pay $50/month. That same startup at 1 million users? $2,000+/month. For checking boolean values.

Self-hosted solutions have a fixed cost: the infrastructure to run them. A $5/month VPS can handle millions of flag evaluations.

2. Data Sovereignty

Every flag evaluation sends data to a third party. User IDs, targeting attributes, feature usage patterns. For companies in regulated industries (healthcare, finance, government), this can be a compliance nightmare.

With self-hosted feature flags, your data never leaves your infrastructure. GDPR, HIPAA, SOC2 - all simpler when you control the data.

3. Vendor Lock-in

Once you've integrated a cloud service's SDK throughout your codebase, switching is painful. Proprietary APIs, custom targeting syntax, unique features that don't translate. You're locked in.

Open-source, self-hosted solutions let you own your feature flag infrastructure. If you need to switch or modify, the code is yours.

4. Latency and Reliability

Cloud services add network hops. Even with edge caching, you're adding latency to every flag evaluation. And when their service has an outage, your feature flags stop working.

Self-hosted flags run in your infrastructure, often on the same network as your application. Latency drops from 50ms to 2ms. Reliability depends on you, not a third party.

When Cloud Makes Sense

Cloud feature flag services aren't bad. They make sense when:

• You need advanced analytics and experimentation (A/B testing platforms)
• You lack ops capacity to run additional infrastructure
• You need enterprise features like SSO, audit logs, and approval workflows
• Your scale is small enough that per-MAU pricing is reasonable

The Self-Hosted Alternative

If you value data sovereignty, predictable costs, and low latency, self-hosted is the way. Modern self-hosted solutions like Flagit give you:

• Single binary deployment (no complex infrastructure)
• SQLite database (no external dependencies)
• Real-time updates via SSE
• Sub-millisecond flag evaluations
• Full control over your data

docker run -p 8080:8080 -v flagit-data:/data s4labs/flagit