The kill switch for code you just shipped
Ship to prod faster,
with more control.
Ship every feature dark. Flip it on for 1% of users, watch it, flip it off in one click. No redeploy, no rollback, no 2am drama.
No credit card · 5-minute setup · One JS SDK, one key
Feature disabled. Users are on the old path.
Propagates globally in seconds
Flip to live
Deploys needed
Line to integrate
To propagate
Small changes.
Big control.
Wrap the risky path in one call. LaunchFlag decides who sees it: you, your team, 5% of traffic, or nobody. Change your mind from the dashboard and it lands before you close the tab.
Environment
Status
Feature enabled. Users on the new checkout path.
Rollout
you turned ON checkout_v2 (prod) · 10% rollout · 2 min ago
if (await flag("checkout_v2", user.id)) {return newCheckout();} else {return oldCheckout();}
→ Resolved: true · new checkout served
→ 1,284 users evaluated · 0 errors
Everything you need to ship bolder. Nothing you don't.
Instant kill switch
One click disables a feature everywhere. No deploy, no revert commit, no incident channel.
Percentage rollouts
Start at 1%. Watch your metrics. Move to 100% when you are ready, or back to 0 when you are not.
Precise targeting
Target by user id or email. Give one customer early access without a branch.
Environments
Dev and production stay separate. The same flag key, two independent states.
Audit log
Every flip is recorded with who, when and why. Answer "what changed?" in five seconds.
Edge evaluation
Flags resolve in your process from a config that caches at the edge. Your app never waits on us, even if we are down.
Every flag. One screen.
Sorted by risk, not alphabetically. The things that are live and rolling out sit at the top, where you can reach them.
Flags
New flagPriced for people
who ship.
No per-seat tax on your teammates. No sales call to see a price. 14-day trial, then pick a plan.
Launch offer · Limited to 10
First 10 customers: 50% off for life.
Applies to Pro or Launch, every month, for as long as you stay.
Spots left · 10 of 10
$12per month
$12 $6 /mo with LAUNCH50 for life
14-day free trial. No card.
For builders shipping every day, on their own or with a small team.
- Unlimited flags
- 2 projects
- 1M evaluations a month
- Percentage rollout and allowlist
- Toggle from your phone
- 30-day audit log
$29per month
$29 $14.50 /mo with LAUNCH50 for life
14-day free trial. No card.
For products with real traffic and more than one thing in flight.
- Everything in Pro
- 3 projects
- 5M evaluations a month
- Emergency off, every flag at once
- Slack or Discord ping on every flip
Less risk. More building.
Ship it dark tonight.
Install the SDK, wrap one risky line, and go to sleep knowing you can undo it from your phone.
Quickstart
$ npm install @launchflag/sdk
$ add LAUNCHFLAG_KEY to .env
Connected in 4.2s