Open-source alternatives to Calendly

3 alternatives, ranked by a published maintenance score computed from live GitHub signals (fetched 2026-09-04). We flag unmaintained projects on both sides — including Calendly itself when the data says so.

About Calendly: Proprietary SaaS; one event type on the free plan. It is closed-source, so the same public maintenance signals do not exist for it — we score only the alternatives below.

The alternatives

Rallly

87 /100 actively maintained

Doodle-style group scheduling polls, self-hostable.

5,242 stars · last commit 2026-09-04 · latest release v4.14.0 (2026-09-03) · 2 open issues/PRs · AGPL-3.0 · fetched 2026-09-04

How this 87/100 was computed

Last commit	today	40/40
Latest release	yesterday	25/25
Community size	GitHub stars	12/15
Open-issue trend	not enough history yet — needs snapshots 21+ days apart; neutral 10/20 awarded meanwhile	10/20
Total		87/100

Easy!Appointments

84 /100 actively maintained

Self-hosted appointment scheduler; syncs with Google Calendar.

4,354 stars · last commit 2026-09-03 · latest release 1.6.1-alpha.1 (2026-08-19) · 167 open issues/PRs · GPL-3.0 · fetched 2026-09-04

How this 84/100 was computed

Last commit	yesterday	40/40
Latest release	16 days ago	25/25
Community size	GitHub stars	9/15
Open-issue trend	not enough history yet — needs snapshots 21+ days apart; neutral 10/20 awarded meanwhile	10/20
Total		84/100

Cal.com (Cal.diy)

77 /100 maintained

Scheduling infrastructure you can self-host; the direct Calendly alternative.

48,138 stars · last commit 2026-09-04 · latest release v6.2.0 (2026-03-01) · 1,426 open issues/PRs · MIT · fetched 2026-09-04

How this 77/100 was computed

Last commit	today	40/40
Latest release	6 months ago	12/25
Community size	GitHub stars	15/15
Open-issue trend	not enough history yet — needs snapshots 21+ days apart; neutral 10/20 awarded meanwhile	10/20
Total		77/100