Quick answer
Yes — Bookslot is a one-time-purchase alternative to Calendly. It costs $99 once, while Calendly runs $10/user/mo — about $120 per year, every year. The Calendly you actually own — timezone-correct booking with email + ICS invites. It is for people who want the job done on their own hardware without a renewal date — not for teams that live inside Calendly's ecosystem.
The verdict
Switch to Bookslot if you are an individual or small team paying Calendly $10/user/mo for work your own machine can do. Pays for itself in under 10 months vs Calendly — then your booking link is free for life.
Stay with Calendly if your workflow depends on its integrations, you need enterprise features (SSO, admin controls, SLAs), or your team is large enough that per-seat collaboration tooling is worth the bill. Bookslot does not try to replicate those.
Head to head
| Bookslot | Calendly | |
|---|---|---|
| Price | $99 once | $10/user/month, forever |
| Cost after 3 years | $99 | $360 |
| Your own domain | Yes | Their domain (branding is a paid add-on) |
| Data ownership | SQLite file on your server | Their cloud |
| Buffers, min notice, date limits | Yes | Yes |
| Email + ICS invites | Yes (BYO SMTP) | Yes |
| Cancel/reschedule links | Yes | Yes |
| Telemetry / tracking | None | Their ToS |
| 5-year cost | $99 | $600 |
Where Calendly still wins
- Ecosystem and integrations. Established tools accumulate years of third-party integrations, templates and add-ons. If your workflow is wired into Calendly's ecosystem, switching means rebuilding that plumbing — a real cost.
- Team and enterprise features. Shared workspaces, granular permissions, SSO, audit logs and a vendor to call when something breaks — that is what the higher subscription tiers actually buy, and a pay-once app does not come with it.
- Familiarity and hiring. Calendly is the name people already know. Onboarding a team onto a tool nobody has used before takes time the subscription never charges for.
Where Bookslot wins
- Price, permanently. $99 once versus $120/yr for as long as you use it. There is no renewal, no seat count and no tier gate.
- Event types. Name, duration, description, color, buffers, minimum notice, max days ahead — each with its own public link.
- Weekly availability editor. Per-day time ranges in your timezone, plus one-off blocked dates and times.
- Timezone-correct slot math. Stored in UTC, computed in your timezone (DST-safe, unit-tested), displayed in the visitor's.
The math
Pays for itself in under 10 months vs Calendly — then your booking link is free for life.
- After 1 year: Bookslot has cost you $99 total — Calendly has cost $120.
- After 3 years: Bookslot is still $99 — the subscription is at $360.
- After 5 years: Bookslot is still $99 — the subscription is at $600.
Common questions
Is it really free on GitHub?
Yes — MIT source at github.com/bensblueprints/booking-page-mvp. $99 buys the packaged installer, 1-click setup, updates and priority support.
Does it sync with Google Calendar?
Not two-way — that's Calendly's strongest feature and we'll say so. Bookslot sends .ics invites your calendar ingests, and you block busy times manually. If you live across 3 synced calendars, Calendly earns its fee.
Do I need a server?
For a public booking page, yes — a $5 VPS with the included Docker setup. Desktop mode works for managing availability and bookings locally.
Is the timezone handling actually correct?
Yes — bookings are stored in UTC, availability is computed DST-safely in your timezone, displayed in the visitor's, and the math is unit-tested including DST gap days.
Try Bookslot — $99, one time
Or get Bookslot plus every other app in the suite: the OneTimeSuite bundle is currently $97, one time.