The self-hosted Calendly alternative
Slotly — Appointment & Booking System (PHP + MySQL, Self-Hosted) — Self-hosted appointment booking engineered so it can't double-book. Own it once, run it on your own server, and stop paying Calendly every month.
Stop renting Calendly
4 months of Calendly equals this one-time price.
Assumption: Per-seat pricing - calculator assumes 3 staff seats x $10 = $30/mo (Standard, annual billing). The free tier cannot model a multi-service business, and "any available staff" round-robin needs Calendly Teams at $16/seat/mo - Slotly ships round-robin in the one-time price.
How Calendly pricing grows with you
Calendly charges per seat, and you add or remove seats directly from account billing as your team changes size.
“From there, you can change your plan, add or remove user seats, and update your payment information.” — their own page, read 2026-08-11
What Calendly does that we don't
Calendly lets you invite teammates into a trial account for free, so a whole team can test paid features together before committing to a plan.
“You can invite team members to join your trial account at no cost.” — their own page
Who should stay with Calendly
If you need calendars to sync automatically with Google, Outlook, or Office 365, stay with Calendly — Slotly only knows about bookings made inside itself and does not sync external calendars. Full honest limitations are on the product page.
Why owning beats renting Calendly
- One payment. No monthly, per-seat, or per-location fees — the license is perpetual.
- Your data stays on your server. It never lives in Calendly's cloud.
- No plan ceilings. Records and users are limited by your hosting, not a pricing tier.
- It keeps working if the vendor doesn't. Self-hosted software can't be sunset or price-hiked out from under you.
Fair trade-offs: you host it, back it up, and apply updates yourself — see the product page for honest limitations, and the full Slotly — Appointment & Booking System (PHP + MySQL, Self-Hosted) vs Calendly comparison.
Sources
- Calendly — price checked 2026-08-04 —
source “$10 /seat/mo; free plan "1 event type" + "Connect 1 calendar" (verified 2026-08-04)”
Competitor prices change — always confirm on the linked page. We only print figures we could verify on the date shown. This vendor is tracked in the Price Observatory — every figure verbatim, dated, re-checked quarterly.