Move fast Break nothing

Feature flags for developers who ship.

Deploy gradually · Test in production · Roll back instantly

Deploy anxiety is real

All-or-nothing deploys. Merge, pray, monitor. Something breaks at 5pm and you're rolling back the entire release. Your team ships monthly instead of daily because nobody wants to be the one holding the deploy.

terminal
 $ git push origin main
Deploying to production...
ERROR: /api/checkout returned 500
ERROR: 2,847 users affected
Rolling back entire release... 

Feature flags give you control

Decouple deployment from release. Ship code to production whenever you want. Roll out to 1% of users, then 10%, then everyone. Something wrong? Disable it in milliseconds. No rollback. No redeploy. No panic.

10x/day

Ship Frequency

200ms

Disable Time

Deploys to Roll Back

5 min

To First Flag

Install. Import. Ship.

5-minute integration, not 5-week onboarding. One API key, clear docs, done.

app.js
$ npm install @flipswitch-io/sdk @openfeature/web-sdk


import { FlipswitchProvider } from '@flipswitch-io/sdk'
import { OpenFeature } from '@openfeature/web-sdk'

await OpenFeature.setProviderAndWait(
  new FlipswitchProvider({ apiKey: 'your-api-key' })
)
const client = OpenFeature.getClient()

// Evaluate a flag
const enabled = await client.getBooleanValue(
    'new-checkout', false, { targetingKey: userId }
)
if (enabled) {
  showNewCheckout()
}
$ pip install flipswitch-sdk openfeature-sdk


from flipswitch import FlipswitchProvider
from openfeature import api

api.set_provider(
    FlipswitchProvider(api_key="your-api-key")
)
client = api.get_client()

# Evaluate a flag
ctx = EvaluationContext(targeting_key=user_id)
enabled = client.get_boolean_value("new-checkout", False, ctx)
if enabled:
    show_new_checkout()
$ go get github.com/flipswitch-io/go-sdk


import (
    "github.com/open-feature/go-sdk/openfeature"
    flipswitch "github.com/flipswitch-io/go-sdk"
)

provider, _ := flipswitch.NewProvider("your-api-key")
openfeature.SetProvider(provider)
client := openfeature.NewClient("my-app")

// Evaluate a flag
enabled, _ := client.BooleanValue(
    ctx, "new-checkout", false, openfeature.NewEvaluationContext(userId, map[string]any{}),
)
// Maven
<dependency>
  <groupId>io.flipswitch</groupId>
  <artifactId>flipswitch-sdk</artifactId>
</dependency>


var provider = FlipswitchProvider.builder("your-api-key").build();
var api = OpenFeatureAPI.getInstance();
api.setProviderAndWait(provider);
var client = api.getClient();

// Evaluate a flag
var ctx = new MutableContext(userId);
var enabled = client.getBooleanValue("new-checkout", false, ctx);
if (enabled) {
    showNewCheckout();
}

The toolkit

Gradual rollouts, kill switches, targeting rules, and experiments — each with a code example.

Gradual Rollouts

Deploy to 1%. Then 10%. Then everyone. Or roll back to 0% instantly.

const enabled = await client.getBooleanValue(
  "new-checkout",
  false,         // default: off
  { targetingKey: userId }
)
// true for ~10% of users, false for the rest

Kill Switches

Something broke? Disable the feature in 200ms. No code deploy. No panic.

const enabled = await client.getBooleanValue(
  "payments-v2",
  false,           // safe default
  { targetingKey: userId }
)
// Toggle off in dashboard → 200ms

Targeting

Show new features to your team first. Or that enterprise customer. Or users in EU.

await client.getBooleanValue(
  "beta-feature",
  false,
  {
    targetingKey: userId,
    team: "engineering",
    region: "eu-west-1"
  }
)

A/B Testing

Measure before you commit. Compare metrics. Make decisions with data.

const variant = await client.getStringValue(
  "checkout-experiment",
  "control",
  { targetingKey: userId }
)
// "control" | "variant-a" | "variant-b"

Open standards. No lock-in.

Built on OpenFeature and OFREP. Switch providers without rewriting your evaluation code.

OpenFeature Native

Standard API, any provider. Flipswitch implements the OpenFeature specification and OFREP protocol. Switch providers without changing application code.

Multi-Language SDKs

First-class SDKs for every major platform. Type-safe, idiomatic, and built for each ecosystem.

JS Python Go Java .NET Rust Swift PHP Ruby

Your Data, Your Rules

Export your flags. Self-host or use our SaaS. No vendor traps. Clear migration paths and open data formats so you're always in control.

View on GitHub

Five minutes to your first flag.

Deploy to prod at 4pm on a Friday. Sleep soundly.

Request Beta Access Read the Docs

Free during beta. Fair and transparent pricing at launch.