v1.0 — May 2026 Streaming evaluator now in public beta

Ship features.
Not deploys.

feat is the feature-flag platform engineers actually like. Toggle, target, experiment, and kill features in 2 ms, anywhere on Earth. Built for teams who release on Friday afternoons — and want to keep doing it.

Start free → Book a 20-min demo

No credit card npm i @feathq/react 2-minute setup

new-checkoutOFF

flag_key: new_checkout_v2

· 3 rules· rolled out to 0% of beta-users· evaluated 1.2M× today

Acme Headphones

Studio-grade sound, 38-hour battery, active noise cancelling.

$249 USD

VARIANT_B · CONTROL

events · livestreaming
04:21flag.evaluatednew_checkout_v2 → true · user_8231
04:19rule.matchedcountry in [US, CA, UK] · plan = pro
04:17flag.evaluatednew_checkout_v2 → false · user_8230

01 / what's in the box

A full flag platform.
No spaghetti.

Six things that take a quarter to build in-house. Six things you get on day one with feat — running on Cloudflare's edge, evaluated in 2 ms.

Targeting that thinks in users.

Match on any user attribute — plan, country, device, custom traits. Save segments and reuse them across every flag. No more spaghetti conditionals in your codebase.

Bulk flag operations.

Tens of thousands of flags? Cleanup is one command. Find stale flags, schedule sunsets, archive in batches — nothing slips through.

Approvals & change requests.

Production needs review. Staging doesn't. You decide — per environment, per flag.

Edge-cached evaluation.

Flags evaluate at your edge in sub-millisecond. No round trips, no waterfall, no spinner.

Audit log auditors love.

Every change, every actor, every diff. SOC 2 and HIPAA ready out of the box.

Globally consistent. Locally fast.

Anycast control plane across hundreds of regions. A flag change in Tokyo lands in São Paulo before the page repaints.

02 / targeting

Build the audience.
See it instantly.

Compose rules in plain English. We compute the matching audience in real time so you know exactly who's getting the change — before you publish it.

flag · new_checkout_v2

Serve true to users where

recalculating

AND

→ otherwise servefalse

live audience preview

0.83M / 4.82M users

17.2% of monthly actives match these rules.

country in "US, CA, UK"  AND
plan is "pro"

03 / rollout + experiments

Ramp safely.
Measure everything.

Drag a slider, ship to 1%. Watch the chart. Ramp to 100% — or kill it. Statistical engine baked in, no extra tool to wire up.

Progressive rollout

drag to adjust

Ship to 1%, watch the metrics, ramp up. Every change is instant — no redeploys, no flag drift.

30%

70% control

In treatment

14,46,000

Evals / min

5,04,000

Latency

2ms p99

Live experiment

streaming

Conversion rate per variant — updated every second from your event stream.

Variant A · new checkoutControl

Variant A winning · 99.2% confidence after 12,481 samples+20.3% lift

Variant A

48.45%

Control

40.28%

Samples

12.4k

04 / sdk

One line. Every
runtime.

Native SDKs for JavaScript, Python, Go, Ruby — and a REST API for everything else. Server-side, edge, mobile, browser — all share the same evaluator, all stream updates in real time over a single open connection.

↪Local cache — flags evaluate at 0 ms after first sync.

↪Streaming updates over Server-Sent Events. No polling.

↪Bootstrap from SSR — no flicker on first paint.

// 1-line install — zero config
import { useFlag } from '@feathq/react'

export default function Checkout() {
  const newCheckout = useFlag('new_checkout_v2', { fallback: false })

  return newCheckout ? <OneTapPay /> : <ClassicCheckout />
}

05 / safety

When it's on fire,
pull the lever.

No incident is a good incident. The next best thing is a kill switch that actually works — globally, in under 200 ms, with a complete paper trail.

Kill a feature in 200 ms.

Something on fire? Hit kill. The change propagates to every server, edge node, and client SDK in under 200 ms — globally. No rollback. No redeploy. No standup.

new_checkout_v2 · productionlive

propagated · us-east-1, eu-west-1, ap-southeast-2—

active sessions affected0

click the button to simulate an emergency kill

07 / receipts

Numbers we
actually publish.

Edge-cached evaluation. Honest uptime targets. Real propagation budgets — measured at your edge, not on a marketing site.

0 ms

p99 SDK eval latency at the edge.

0.00 %

uptime SLA — Growth tier and above.

0 ms

global propagation — change to last edge node.

free-tier monthly active users — every plan unlimited flags.

08 / pricing

Honest pricing.
No “contact us” tax.

Free forever for solo devs. Flat-rate plans for teams. Everything inclusive — no metered evaluation fees, no per-seat tax, no overage surprises.

Free

$0 7,500 MAU

The free tier real startups can actually run production on.

Boolean, string, number & JSON flags
Attribute-based targeting
Percentage rollouts
Kill switch + archive
Real-time SSE updates
Built-in roles · 2FA · OAuth
30-day audit log
Community support
2 projects · unlimited envs · unlimited flags

Start free →

Starter

$19/mo $15/mo billed annually 25,000 MAU

A real, production-ready flag platform for under $20/mo.

Everything in Free, plus:
Segments + anonymous contexts
Scheduled flag changes Coming Q3 2026
Stale-flag detection Coming Q3 2026
Flag maintainer / ownership
Required comments on changes
Webhooks Coming Q3 2026
CLI Coming Q3 2026
90-day audit log · email support (48h)

Start free →

Get back to
shipping.

Start for free → Talk to an engineer

Ship features. Not deploys.