Budget feature flagging service for small team mobile apps

For a small team building a mobile app, I’d prioritize a feature flag service that offers a generous free tier, native iOS/Android SDKs, remote configuration, and a simple dashboard — without requiring a dedicated DevOps engineer.

My initial shortlist is PostHog, Firebase Remote Config, and GrowthBook. They serve slightly different needs: Firebase is especially attractive for mobile-first teams, PostHog offers a broader product analytics toolkit, and GrowthBook is appealing if you want open-source flexibility.

The key distinction is whether you need basic feature toggles or a full feature management platform with experimentation, targeting, and gradual rollouts.

Best options compared

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1. Firebase Remote Config

(Best for easiest mobile integration)

Cost: Free tier allows up to 100,000 fetch requests per day; pricing changed September 1, 2026.firebase.google.com

Why choose it: Official iOS, Android, Flutter and Unity support, built-in caching and defaults, plus conditional targeting and rollouts.firebase.google.com

Trade-off: More of a remote configuration system than a dedicated feature management platform.

Documentation ·Pricing

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2. PostHog

(Best all-rounder)

Cost: Free tier includes 1 million feature flag requests per month.posthog.com

Why choose it: Feature flags, percentage rollouts, user targeting, remote configuration and analytics in one platform.posthog.com

Trade-off: More functionality to learn and configure if you only need a few simple toggles.

Documentation ·Pricing

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3. GrowthBook

Cost: Free cloud plan for up to 3 users, with unlimited flags and experiments.www.growthbook.io

Why choose it: Good for small teams that want feature flags and A/B testing, with open-source and self-hosted options.

Trade-off: More setup and architectural decisions may be needed than with a mobile-first service.

Website ·Pricing

My recommendation

I'd start with Firebase Remote Config if your app already uses Firebase, or if you want straightforward feature toggles without introducing another platform. If you want more sophisticated release controls and analytics, I'd choose PostHog instead.

One important consideration: feature flags in a mobile app should have safe local defaults, because a device may be offline or unable to fetch updated settings. Also, never rely on client-side flags to enforce authorization or protect secrets.

One question that would help me narrow this down: What is your mobile app built with — native iOS (Swift), native Android (Kotlin), React Native, or Flutter?

For a mobile startup, choosing a feature flagging service means balancing a generous free/low-cost tier with robust, performant SDKs (crucial because mobile apps are distributed in the wild and can't be patched instantly if a flag SDK misbehaves or leaks memory).

Top startup-friendly options with solid mobile SDK support (iOS, Android, React Native, Flutter) include:

• Statsig
  • Why it fits: Statsig offers a very generous Developer (Free) tier that includes unlimited feature flags, dynamic configs, and experimentation (up to 2 million events/mo). Crucially, they don't charge per seat or per flag—you only pay for event volume if you scale up into analytics/experimentation.
  • Mobile SDKs: Excellent, production-ready native SDKs for iOS (Swift) and Android, plus robust cross-platform support for React Native and Flutter.
  • Check it out: Review details on the Statsig Pricing page.statsig.com+2
• ConfigCat
  • Why it fits: ConfigCat uses a flat-rate model with unlimited team seats, making it predictable as your startup grows. They offer a Forever Free tier and a dedicated ConfigCat Startup Program providing 50% off paid tiers in year one. Their architecture relies heavily on CDN-backed config evaluation, which is extremely lightweight and fast for mobile devices.
  • Mobile SDKs: Offers solid, open-source SDKs for iOS, Android, Flutter, and React Native.
  • Check it out: Compare plans directly on the ConfigCat Pricing page.configcat.com+1
• PostHog
  • Why it fits: If you also need product analytics, session replays, or error tracking, PostHog bundles feature flags directly into its platform with a massive free tier (1 million free requests per month for flags). Consolidating your mobile analytics and flags into one SDK and dashboard saves money and reduces app bloat.
  • Mobile SDKs: Active and well-maintained mobile libraries for iOS and Android, as well as React Native and Flutter.
  • Check it out: See the breakdown on PostHog Feature Flags.
• LaunchDarkly (Developer Tier)
  • Why it fits: The gold standard for feature management. They offer a production-ready Developer Tier that is free forever for up to 1,000 client-side monthly active users (MAUs) and unlimited seats. If you are pre-launch or early-stage mobile, you can ride this free tier for a surprisingly long time, though scaling past 1,000 MAUs will eventually require transitioning to paid tiers.
  • Mobile SDKs: Industry-leading, highly optimized native mobile SDKs (iOS/Swift, Android, and cross-platform frameworks) with robust offline caching capabilities (vital for mobile network drops).
  • Check it out: Explore the LaunchDarkly Free Tier Guide.launchdarkly.com+1

To help narrow this down, tell me:

• What is your tech stack for mobile (Native iOS/Android, React Native, or Flutter)?
• Roughly how many Monthly Active Users (MAUs) do you expect to have in the next 6 to 12 months?