Appointment Scheduling Software · reliability comparison
Cal.com vs Square Appointments: which is more reliable? (2026)
Cal.com is more reliable than Square Appointments, scoring 86.2 vs 53.3 out of 100. Over the last 90 days Cal.com reported 3 incidents and Square Appointments reported 12, with effective uptime of 100% and 98.93% respectively.
Data updated Nov 1, 2026 · How we score
VS
| Metric | Cal.com | Square Appointments |
|---|---|---|
| Reliability score | 86.2 | 53.3 |
| Rank (scheduling apps) | #6 | #9 |
| Uptime (90 days) | 100% | 98.93% |
| Incidents (90 days) | 3 | 12 |
| Partial / major outages | 2 | 0 |
| Avg time to resolve | — | 12h 49m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Cal.com and Square Appointments differ
- Square Appointments reported 4× as many incidents as Cal.com over the last 90 days (12 vs 3).
- Cal.com had 2 partial or major outages, compared with 0 for Square Appointments.
90-day uptime
Cal.com
Square Appointments
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Cal.com incidents
- Partial outageOct 24, 2026 · resolved (duration not published)
Resolved - Identified - Issues with Enterprise SAML Authentication
- Degraded performanceSep 15, 2026 · resolved (duration not published)
- Major outageAug 31, 2026 · resolved (duration not published)
Resolved - Major outage: We resolved an issue impacting the API - https://api.cal.com/
Recent Square Appointments incidents
- Degraded performanceSep 27, 2026 · resolved in 4h 25m
- Degraded performanceSep 24, 2026 · resolved in 12m
- Degraded performanceSep 21, 2026 · resolved in 2d 4h
- Degraded performanceSep 18, 2026 · resolved in 3h 54m
- Degraded performanceSep 18, 2026 · resolved in 15h 7m
- Degraded performanceSep 16, 2026 · resolved in 34m
Other scheduling apps to consider
- Calendly · #1 · 100% uptime
- Doodle · #2 · 100% uptime
- SavvyCal · #3 · 100% uptime
- Sign In Scheduling (formerly 10to8) · #4 · 100% uptime
See the full most reliable appointment scheduling software ranking →