A small popup showing recent activity is a tiny script and an event feed — genuinely one of the simplest builds in this whole library, the same shape as this register's Fomo case.
Build it
Effort: an eveningRunning cost: $0/mo to start
Why CanICodeThis says Build it
A popup widget triggered on a timer, pulling from a small feed of recent events, is basic front-end work
Recording a 'purchase' or 'signup' event from your own store is a single webhook or API call
Styling and positioning the popup is ordinary CSS
The parts that'll cause problems
Pulling events automatically from many different e-commerce platforms needs a connector per platform
Geolocation display needs an IP-to-location lookup
A/B testing whether the popup helps conversion shares this register's basic A/B testing pattern
How I'd build this
frontend
Astro or Next.js
database
Turso (SQLite)
hosting
Cloudflare Pages
MVP scope
A small script showing a popup on a timer
A feed of events my own site posts to
Dismissible, positioned in a corner
Postpone to v2
Multi-platform e-commerce connectors
Geolocation display
A/B testing conversion impact
What it actually costs to build
AI agent — with a subscription (Claude Pro/Max, Cursor, etc.)
$0 marginal
AI agent — pay-per-use API, no subscription
$16–$27 one-time
Hosting, once it's running
$0/mo (free tier)
Domain name, if you want your own
~$12/yr
Existing tools solving a similar problem typically run $25–$39/mo — see how they compare below.
The build prompt
Build me a social-proof popup widget: a small script that shows a popup with recent activity pulled from a feed of events my own site posts to a small API. Positioned in a corner, dismissible, shown on a timer.