when

Open source · Self-hostable on Vercel free tier

Scheduling that respects
your time.

WHEN is a lightweight, open-source booking platform you fully own. Free of bloat, free of limits, free to deploy in five minutes.

No credit card. No paid tier. Just a clone-and-deploy button.

What's inside

Everything you need. Nothing you don't.

Internal account access

Sign in with your email and password. Access is managed by your administrator.

Google Calendar sync

Read busy events automatically. New bookings land in your calendar.

Email notifications

Confirmations, reminders, and cancellations via Resend.

Custom event types

Per-link duration, buffer, color, custom questions.

Real availability rules

Weekly hours, blocked dates, buffer time, minimum notice.

Yours forever

MIT-licensed. Your booking page, your branding, your data.

01

Sign in to your account

Your administrator creates your account and personal booking URL.

02

Set your hours

Pick weekly availability, buffer time, and minimum notice. Block dates as needed.

03

Share your link

Visitors pick a slot in their own timezone. Bookings hit your calendar instantly.

Self-host in 5 minutes.

Deploy your instance to Vercel with one click. Bring your PostgreSQL database, Resend account, and Google credentials.