FeatureFlags.app
A privacy-first feature flag management platform built specifically for .NET applications, letting teams toggle features and roll out changes gradually without redeploying code.
🔗 Visit FeatureFlags.app
Description
Think of a feature flag like a light switch hidden inside your software: instead of ripping out wiring (redeploying the whole application) every time you want to turn a new feature on or off, you just flip the switch. FeatureFlags.app gives .NET development teams a simple control panel for those switches, so they can turn a new feature on for a small group of users first, watch how it behaves, and only flip it on for everyone once they are confident it works -- or instantly flip it back off if something breaks, all without waiting on a new deployment.
Under the hood, FeatureFlags.app is built as a companion to Microsoft's own .NET feature management libraries, so it slots into existing .NET codebases using familiar patterns rather than requiring a new framework. It is cloud-agnostic -- hostable on Azure, AWS, GCP, or your own servers -- which distinguishes it from Azure App Configuration, Microsoft's own flag-management offering that only works if you are already on Azure. Core capabilities include percentage-based rollouts, user targeting rules, multi-environment support, audit logs, and a caching layer to keep flag checks fast. It also markets itself as not collecting analytics or recording user sessions, a contrast the maker draws explicitly against LaunchDarkly and other hosted platforms. As of August 2026 the product is very new -- built and shared by a solo/small team on Show HN -- and it does not yet publish a pricing page.
💬 Our review
The short version: FeatureFlags.app solves a real, narrow problem -- a non-Azure UI for .NET's built-in feature flag library -- competently, but it is a brand-new, unproven product with no public pricing.
Compared to LaunchDarkly, the dominant name in feature flagging, FeatureFlags.app is far more limited in scope (only .NET, versus LaunchDarkly's SDKs for essentially every language plus analytics and experimentation tooling) but also simpler and pitched at teams who find LaunchDarkly overkill or do not want flag data flowing into a vendor's analytics pipeline. Compared to Azure App Configuration, it is the obvious pick for teams that want to avoid Azure lock-in; compared to ConfigCat, another lightweight competitor, it currently lacks ConfigCat's transparent published pricing and broader SDK support. The lack of a visible pricing page is the biggest weakness for anyone evaluating this today -- an HN commenter pushed back on paying '$10/month' for something '.NET itself' partly solves, and the maker did not publish numbers to settle it. Worth a look if you are .NET-only and privacy-conscious; wait for a mature pricing page and more track record before betting a production release process on it.
💰 Pricing
📊 Global score
🤖 AI-enriched data
Free 'Start Free' signup; no published pricing page or plan tiers as of Aug 2026 (an HN commenter referenced a possible $10/month price point, unconfirmed by the maker).
Pros
No user analytics tracking or session recording
Cloud-agnostic -- runs on Azure, AWS, GCP, or on-premises
Native integration with Microsoft's .NET feature management libraries
Built-in caching keeps flag checks fast
Cons
No public pricing page or published plan tiers as of Aug 2026
.NET-only -- no SDKs for other languages or runtimes
Very early-stage product, still described as 'early' by its own creator
Smaller ecosystem and track record than established players like LaunchDarkly