Live Demo
See it in action.
Toggle flags and watch the preview update in real time. No sign-up, no API key — pure simulation.
Flag controls
0 active
Evaluation context
userId"usr_internal_01"
plan"enterprise"
betaOptIntrue
Feature flags
new-checkoutboolean2/3 users
Redesigned checkout — fewer steps, higher completion
betaOptIn == true
discount-bannerboolean2/3 users
Promotional banner for paying users
plan != "free"
hero-cta-variantstring1/3 users
A/B variant: product-led CTA copy
plan == "enterprise"
dark-sidebarboolean3/3 users
Dark navigation sidebar for all users
everyone
SDK evaluation
const enabled = await signal.isEnabled(
'new-checkout',
{ userId: 'usr_internal_01' }
)
// =>false
app.yourproduct.com
Live
Dashboard
Products
Orders
Analytics
Settings
usr_internal_01
enterprise plan
⚡ Flag updated — propagated to all instances in <50ms
Pro plan offer — 3 months free. Limited time.Claim
Your product dashboard.
Manage your products and orders.
Checkout rate
24%
Avg. revenue
$1840
CTA click-through
3.2%
Checkout
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Step 4