LaunchDarkly is the enterprise incumbent in feature flags - built for large organisations with complex compliance requirements, multi-language stacks, and teams that need A/B experimentation baked into the same platform. Its pricing reflects that: you start paying before a single user evaluates a flag.

Supaship is built for the opposite end of the spectrum: JavaScript developer teams that want the best possible feature flag experience without enterprise overhead. Cleaner SDKs, full TypeScript inference, first-class Next.js App Router support, and pricing that scales with actual usage - not with your headcount, service connections, or project count.

If you're a JS/TS team evaluating feature flag platforms, this article will show you exactly why Supaship is the better choice - and the narrow set of cases where LaunchDarkly's depth genuinely matters.

Quick comparison

Pricing: the biggest difference

This is where the two platforms diverge most sharply.

LaunchDarkly pricing

LaunchDarkly's Foundation plan charges on two dimensions simultaneously:

• $12/month per service connection - a service connection is each microservice, replica, or environment connected to LaunchDarkly
• $10/month per 1,000 client-side MAUs - unique users or devices that evaluate flags each month

A real example: a team running 3 environments (dev, staging, production) each with 2 replicas = 6 service connections = $72/month before a single user evaluates a flag. Add 50,000 MAUs and you're at $572/month.

Scale to 500,000 MAUs with 10 service connections and the bill reaches $5,120/month - just for basic feature flagging, before add-ons like Experimentation ($3/1k MAU), Data Export, or enhanced support.

The Developer (free) tier is limited to 5 service connections and 1,000 MAUs - enough to get started, but easy to outgrow quickly.

Supaship pricing

Supaship uses a single billing metric: events. One event = one flag evaluation. No service connections, no MAU counts, no per-seat fees, no per-project charges.

• Free forever: 1 million events/month - unlimited flags, unlimited team members, unlimited projects
• Pro: $30/month for your entire workspace, includes 3 million events, then $0.03/1k events after that

That $30 covers every project in your workspace. Build five apps? Still $30/month.

The real-world comparison: A team with 500,000 MAUs evaluating flags 3–4 times per session generates roughly 1.5–2M events/month - within the free tier or the base Pro plan at $30. The same team on LaunchDarkly Foundation pays $5,120/month in MAU + service connection charges. That's a 170× difference.

Even at very high scale - 50M events/month - Supaship Pro costs $30 + $1,410 = $1,440/month, still less than half of what LaunchDarkly charges at that volume.

The pricing verdict

For small projects and internal tools, both platforms have a usable free tier. For any growing application, the gap is stark. LaunchDarkly starts charging before a single user evaluates a flag (service connection fees). Supaship's first dollar of cost comes at 1M flag evaluations - and the Pro plan at $30 covers three times that volume.

If pricing predictability and cost at scale matter to your team, Supaship is the clear choice.

Developer experience

SDK setup

LaunchDarkly has 30+ SDKs covering every language and runtime from Go and Java to iOS and Android. The breadth is impressive. The tradeoff is that the SDKs carry significant initialisation overhead - LaunchDarkly uses a persistent streaming connection to receive flag updates in real time, which means startup time is higher and the SDK footprint is larger.

// LaunchDarkly React SDK setup
import { withLDProvider } from 'launchdarkly-react-client-sdk'

export default withLDProvider({
  clientSideID: 'your-client-side-id',
  context: {
    kind: 'user',
    key: 'user-key-123',
    name: 'John Smith',
  },
})(App)

Supaship covers the JavaScript ecosystem - React, Next.js, Vue, and Node.js - with lightweight native SDKs that are intentionally easy to configure. Installation is a single pnpm add, define your flags, wrap your app in a provider, and the first flag is live in under 5 minutes. For non-JS services (Python, Go, Ruby, etc.), Supaship's REST API provides the same flag evaluation via a simple HTTP request - no SDK install, no dependency to manage:

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",
      "email": "user@example.com"
    }
  }'

The native SDK API is identical across all supported frameworks, so there's nothing new to learn as you add frameworks to your stack.

// Supaship React SDK setup
import { createSupaship, FeaturesWithFallbacks } from '@supashiphq/react-sdk'

const FEATURE_FLAGS = {
  'new-dashboard': false,
} satisfies FeaturesWithFallbacks

app.use(
  createSupaship({
    config: {
      apiKey: import.meta.env.VITE_SUPASHIP_API_KEY,
      environment: import.meta.env.MODE,
      features: FEATURE_FLAGS,
    },
  }),
)

Type safety

Both SDKs support TypeScript, but the approaches differ. LaunchDarkly's type system requires you to look up flag variation types at the call site:

// LaunchDarkly  -  types are not inferred from a central definition
const showNewDashboard = ldClient.variation('new-dashboard', false) // boolean

Supaship's satisfies FeaturesWithFallbacks pattern defines all flags and their types once, then propagates those types to every call:

// Supaship  -  TypeScript knows the return type of every flag
const FEATURE_FLAGS = {
  'new-dashboard': false,
  'theme-config': { mode: 'light' as 'light' | 'dark' },
} satisfies FeaturesWithFallbacks

// Later  -  fully typed, IDE autocomplete, compile-time errors on unknown flags
const { feature: newDashboard } = useFeature('new-dashboard') // ComputedRef<boolean>
const { feature: theme } = useFeature('theme-config') // ComputedRef<{ mode: 'light' | 'dark' }>

Development toolbar

Both platforms provide a way to override flags locally during development. LaunchDarkly has a browser extension; Supaship ships a built-in toolbar that appears automatically in development environments and lets you override any flag without leaving the app.

When LaunchDarkly makes sense (and when it doesn't)

LaunchDarkly is a genuinely capable platform - but it's built for a very specific customer: large enterprises with compliance requirements, polyglot stacks, and teams running dedicated experimentation programs. Outside that profile, its complexity and pricing are overhead rather than value.

You need A/B experimentation as a core product discipline - LaunchDarkly's experimentation suite covers statistical significance, funnel optimization, mutual exclusion, and metric imports. This is valuable if your team has a data science function running structured experiments. For teams doing gradual rollouts and user targeting - which is the vast majority of feature flag use cases - Supaship handles that fully, without the experimentation overhead.

You need automated release pipelines with guardrail metrics - LaunchDarkly's Enterprise and Guardian tiers offer rollout automation, automatic pause/rollback, and release health monitoring. This is enterprise-scale release orchestration - a niche requirement that most teams handle through their deployment pipeline or observability tools.

Your stack is entirely non-JavaScript and you need native SDK integrations - LaunchDarkly has purpose-built SDKs for Go, Python, Java, Ruby, iOS, and Android. Supaship's native SDKs target JavaScript, but its REST API makes flag evaluation available from any language or runtime with a single HTTP call. For most teams with mixed stacks - a TypeScript frontend plus a Python or Go service - the REST API covers the non-JS layer without requiring a platform switch. The native SDK advantage only matters if you need the streaming, real-time update model in a non-JS runtime.

You have strict enterprise compliance requirements - HIPAA, FedRAMP, SCIM, custom roles, and SSO are LaunchDarkly Enterprise features. These matter to regulated industries. If that's your situation, the compliance investment makes sense. For everyone else, these are requirements you'll never use - and you'd be paying for them.

For any team that doesn't fit these profiles, LaunchDarkly's complexity and cost structure are a poor trade for what you actually need.

Features: where Supaship wins

Pricing at scale - For applications with large user bases, Supaship's event-based pricing scales far more affordably than LaunchDarkly's MAU + service connection model.

Simpler setup for modern JS stacks - If your entire stack is JavaScript, Supaship's SDKs are purpose-built for those runtimes with better TypeScript ergonomics and tighter integrations. See the dedicated guides: React, Next.js (Server Components, Middleware, App Router), Vue, and Node.js.

Object-valued flags as a first-class feature - Both platforms support multi-variant flags, but Supaship's SDK makes typed configuration objects natural and ergonomic. Carrying structured config in a flag (e.g. { model: 'gpt-4o', maxTokens: 512 }) is a first-class pattern.

Predictable bills - No service connections, no MAU metering, no surprise charges when a feature goes viral.

Who should choose what

Choose LaunchDarkly if:

• You're in a regulated industry requiring HIPAA or FedRAMP compliance and need those guarantees from your feature flag vendor
• A/B experimentation with statistical rigour is a dedicated workflow at your company, not just gradual rollouts
• Your stack is entirely non-JavaScript (Go, Java, Python, native mobile) and you specifically need native SDK integrations rather than the REST API
• You have an existing LaunchDarkly Enterprise contract with deeply embedded integrations

Choose Supaship if:

• Your stack is JavaScript or TypeScript - React, Next.js, Vue, or Node.js
• You want the cleanest feature flag developer experience: full TypeScript inference, first-class App Router support, consistent API across every JS framework
• You want flags in production in under 5 minutes, not an afternoon of SDK wiring
• You want pricing that starts free and scales with flag evaluations - no service connection fees, no MAU charges, no surprise multipliers when you add a second app
• You already have an analytics or experimentation tool (Amplitude, Mixpanel, PostHog) and don't want to pay for a second one bundled into your flag platform
• You're a startup, scale-up, or mid-size product team that wants a focused tool maintained by people obsessed with feature flags

Migrating from LaunchDarkly to Supaship

If you're currently on LaunchDarkly and want to evaluate Supaship, the migration path is straightforward. Supaship uses the same conceptual model (flags, environments, targeting rules, percentage rollouts), so the transition is mostly a matter of:

1. Creating matching flags in Supaship
2. Swapping the SDK import and initialization
3. Updating flag evaluation calls to use getFeature / useFeature
4. Removing the LaunchDarkly SDK dependency

The Supaship free tier (1M events/month) gives you room to run both in parallel during the transition.

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For most JavaScript developer teams, Supaship is the right choice: better ergonomics, better TypeScript support, better Next.js integration, and pricing that doesn't punish you for building more than one app. LaunchDarkly's enterprise depth is real - but if you're not an enterprise with compliance mandates and a polyglot stack, you're paying for infrastructure you'll never use.

Ready to try Supaship? Sign up for free - 1 million events/month, unlimited projects, no credit card required. Pro plan is $30/month for your entire workspace when you're ready to scale.

Get started with your framework: Next.js · React · Vue · Node.js

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