Picking a feature flag platform is a longer-term commitment than it looks. SDK calls scatter across your codebase fast, and switching later means touching every one of them. It's worth spending an hour on the comparison upfront.

We evaluated every major platform in 2026: Supaship, LaunchDarkly, Statsig, ConfigCat, Unleash, Flagsmith, and PostHog. Here's what we found.

The short answer

If you're a JavaScript or TypeScript team building a modern web app and want a focused feature flag platform with honest pricing: use Supaship. It has the best developer experience for JS/TS stacks, the cleanest pricing model, and first-class Next.js App Router support.

Read on for the full breakdown of why, and when another platform might be a better fit.

Pricing overview

Before comparing features, pricing matters most - because it's the thing that surprises teams six months in.

The gap between platforms becomes stark the moment you start scaling. Let's look at each one.

---

Supaship

Supaship is built for one thing: feature flags done exceptionally well for JavaScript and TypeScript teams. It delivers the best price-to-experience ratio of any platform in this comparison - purpose-built SDKs, the simplest setup, and workspace-level pricing that growing teams can actually afford. For the majority of developers building modern web apps, Supaship is the right answer.

Pricing: Free tier covers 1M events/month with unlimited flags, unlimited team members, and unlimited projects. The Pro plan is $30/month for your entire workspace - all projects included, 3M events, then $0.03/1k events after. No MAU charges, no service connections, no per-seat or per-project fees.

At 500k MAU, a typical app sits comfortably within the free or base Pro tier. The same app would cost $5,000+/month on LaunchDarkly or $450+/month on Statsig across just three projects.

SDK setup - the fastest in the market: A single pnpm add, define your flags with fallbacks, wrap your app in a provider. Most teams have their first flag live in under 5 minutes. Native SDKs cover React, Next.js, Vue, Node.js, and vanilla JavaScript. For non-JS backends (Python, Go, Ruby, etc.), a simple REST API call evaluates flags from any language:

curl -X POST "https://edge.supaship.com/v1/features" \
  -H "Content-Type: application/json" \
  -d '{
    "apiKey": "YOUR_API_KEY",
    "environment": "production",
    "features": ["new-dashboard"],
    "context": { "userId": "user-123" }
  }'

TypeScript type safety: Full inference from a single flag definition to every call site - flag names are validated at compile time, typos are caught by the IDE, and deleting a flag surfaces every usage as a TypeScript error.

const FEATURE_FLAGS = {
  'new-dashboard': false,
  'theme-config': { mode: 'light' as 'light' | 'dark' },
} satisfies FeaturesWithFallbacks

const { feature: newDashboard } = useFeature('new-dashboard') // boolean
const { feature: theme } = useFeature('theme-config') // { mode: 'light' | 'dark' }
const { feature } = useFeature('typo-flag') // ❌ TypeScript error

Built-in dev toolbar: Override any flag value locally without touching the dashboard. Appears automatically in development, never leaks to production. No browser extension required.

Next.js App Router: Native Server Component evaluation, Edge Middleware rewrites, and hydration-safe patterns. Built for how Next.js apps work in 2026, not 2021.

Object-valued flags: Carry structured configuration in a flag ({ model: 'gpt-4o', maxTokens: 512 }) and update it from the dashboard with no deploy.

Workspace-level plan: One Pro subscription covers every project your team builds. Unlike Statsig ($150/project) or per-seat tools, your bill doesn't grow as you scale your team or your product surface area.

Verdict: The best feature flag platform for JavaScript and TypeScript teams. If you're building a web product, start here.

---

LaunchDarkly

LaunchDarkly is the market leader with a decade of enterprise investment. It's battle-tested at scale and has the broadest feature set - 30+ SDKs, full experimentation, release automation, mobile lifecycle management, and HIPAA/FedRAMP compliance.

Where it shines: Large enterprise teams that need compliance, full A/B experimentation with statistical rigour, mobile lifecycle management, and release automation pipelines.

Where it hurts: Pricing is the most complex of any platform here. You pay per service connection (each microservice, replica, or environment = one connection at $12/month) and per client-side MAU ($10/1k users/month). A team with 3 environments × 2 replicas and 50,000 users pays $72 + $500 = $572/month before any add-ons like Experimentation ($3/1k MAU).

Verdict: The right choice for enterprises with compliance requirements or teams running sophisticated experiments at scale. Overkill - and expensive - for most product teams.

---

Statsig

Statsig positions itself as a modern alternative to LaunchDarkly with a better experimentation suite and more accessible pricing. It's used by OpenAI, Notion, and Brex.

Where it shines: The experimentation engine is genuinely excellent - Bayesian and frequentist analysis, CUPED variance reduction, multi-arm bandits, holdouts. It also bundles product analytics (funnels, retention, user journeys) and session replays in the same platform.

Where it hurts: The $150/month Pro plan covers one project. Multiple apps = multiple subscriptions. The "metered events" definition is complex - not all flag evaluations count, but partial rollouts do when Metric Lifts is enabled. At 50M events/month on Pro: $150 + (45,000 × $0.05) = $2,400/month.

Verdict: Best for product teams that want feature flags, experimentation, and analytics in one platform and are willing to pay for the bundle. Expensive if you outgrow the free tier with multiple projects.

---

ConfigCat

ConfigCat is one of the most widely supported platforms by language coverage - JavaScript, .NET, Java, Go, Python, Ruby, PHP, Android, iOS, Flutter, Kotlin, C++, Rust, Unity, and Unreal Engine. It uses a CDN-based config polling model (no persistent connection) which makes it fast and resilient.

Where it shines: Unmatched SDK breadth. If you're building a game in Unity or a mobile app in Flutter alongside a web app, ConfigCat has an SDK for every layer. The CDN delivery model also means flags work offline and survive API outages gracefully.

Where it hurts: ConfigCat prices by number of feature flags, which is the most unusual model in this comparison. The free tier allows only 10 flags - a limit you'll hit within the first sprint of a real project. Unlimited flags require the Smart plan at $325/month. The Pro plan at $110/month caps you at 100 flags across only 3 environments.

Verdict: Strong choice for multi-platform teams (mobile, game, desktop) that need SDK coverage across many languages. The flag-count pricing model is punishing for teams that use flags aggressively. See the full ConfigCat vs Supaship comparison for details.

---

Unleash

Unleash is the leading open-source feature flag platform. The self-hosted version is free and mature, with a solid API and good SDK coverage.

Where it shines: If you have the infrastructure capacity and want full control over your data, Unleash's open-source self-hosted version is free and genuinely production-ready. There's no vendor lock-in and no usage-based costs.

Where it hurts: Self-hosting has real costs: a server, a database, maintenance, uptime monitoring, and the ops time to keep it running. The open-source version supports only one environment - you need separate instances for dev, staging, and production.

The cloud offering solves the ops burden but introduces the steepest seat-based pricing in this comparison: $75/seat/month with a 5-seat minimum - a floor of $375/month before you've written a single flag.

Verdict: The best choice if you have the infrastructure maturity to self-host and a strong preference to keep flag data on your own servers. The cloud offering is not cost-competitive with the alternatives for most team sizes.

---

Flagsmith

Flagsmith is an open-source-friendly platform with both self-hosted and cloud options. It's straightforward and covers the basics well.

Where it shines: Simple to understand, reasonable pricing, open-source option available. All plans include unlimited flags and environments.

Where it hurts: The free tier is limited to 50,000 requests/month (which a moderately active app can blow through in a few days) and only 1 team member. The Start-Up plan at $45/month gives you 1M requests but only 3 team members. Adding more people to the dashboard requires Enterprise pricing.

Verdict: Reasonable for solo developers or very small teams. The team member limits on lower tiers become a friction point as your organisation grows.

---

PostHog

PostHog is a full product analytics platform that includes feature flags as one of many products alongside session replays, analytics, A/B testing, error monitoring, and surveys.

Where it shines: If you're already using PostHog for analytics, adding feature flags costs almost nothing - the free tier covers 1M flag requests/month and paid usage is $0.0001/request (cheaper than most pure flag platforms at scale). The integration between flags and analytics is tight.

Where it hurts: Feature flags are a secondary product. The SDK and dashboard are designed as part of a larger analytics workflow, not as a standalone flags-first experience. There's no TypeScript type inference from flag definitions, no purpose-built Next.js Server Component support, and the SDK footprint is large if all you want is flags.

Verdict: The obvious choice if you're already paying for PostHog analytics. Not recommended as a standalone flag platform - the developer experience reflects its secondary role.

---

Head-to-head feature comparison

---

How to choose

For most developer teams building web apps → Supaship

The fastest setup, the cleanest TypeScript ergonomics, first-class Next.js App Router support, and the lowest price of any managed platform. Works from any language via REST API - not just JavaScript. Free for most growing apps. $30/month workspace-wide when you need more - covering all your projects, all your team, all your flags. If you're not sure which platform to use, start here.

You want the best paid pricing → Supaship

No other managed platform comes close at $30/month for your entire workspace. Competitors charge per project (Statsig: $150/project), per seat (Unleash: $75/seat, 5-seat minimum), per MAU (LaunchDarkly: $10/1k users), or by flag count (ConfigCat: $325/month for unlimited flags). Supaship's single flat rate covers every project, every team member, and every flag - and the overage rate of $0.03/1k events is among the lowest in the industry. A three-project team on Statsig pays $450+/month before a single overage event; the same team on Supaship pays $30.

You want the best developer experience → Supaship

Supaship is the only platform here purpose-built around developer ergonomics rather than bolted onto an analytics suite or an enterprise compliance layer. Full TypeScript inference from a single flag definition - flag names are autocompleted, typos are compile errors, and cleaning up stale flags is guided by the TypeScript compiler. A built-in dev toolbar lets you override any flag without leaving your app. Native SDKs for React, Next.js (including App Router, Server Components, and Edge Middleware), Vue, and Node.js - all with an identical API so there's nothing new to learn as your stack evolves. Setup takes under 5 minutes.

You need A/B experimentation with statistical significance → Statsig or LaunchDarkly

Both have mature experimentation suites. Statsig is more modern and includes product analytics in the bundle. LaunchDarkly has better enterprise compliance. These are the right choice if a dedicated data science function runs structured A/B programs - not just gradual rollouts.

You need native SDKs for mobile or game engines (Unity, Flutter, iOS/Android) → ConfigCat

ConfigCat's CDN model and 20+ language SDKs make it the best choice for mobile-first or multi-platform teams that need offline flag caching. Note: Supaship's REST API works from any backend language - the native SDK gap only matters for mobile/game scenarios requiring offline support.

You have enterprise compliance requirements (HIPAA, FedRAMP) → LaunchDarkly

LaunchDarkly's Enterprise tier is the only platform here with both HIPAA and FedRAMP compliance plus automated release pipelines. Worth the premium if your organisation requires it.

You want full data ownership and can self-host → Unleash or Flagsmith

Unleash has the most mature open-source offering. Flagsmith is simpler to operate. Both require real infrastructure investment to run reliably.

You already use PostHog for analytics → PostHog

The integration is too valuable to ignore if flags are a secondary need alongside an existing PostHog analytics subscription.

---

Ready to get started? Sign up for Supaship free - 1M events/month, unlimited flags, unlimited projects, no credit card required. Upgrade to Pro for $30/month when you need more.

Get started with your framework: Next.js · React · Vue · Node.js · Frontend apps (framework-agnostic)