Appointment Scheduling Software · reliability comparison
Acuity Scheduling vs Cal.com: which is more reliable? (2026)
Cal.com is more reliable than Acuity Scheduling, scoring 86.2 vs 45.5 out of 100. Over the last 90 days Acuity Scheduling reported 7 incidents and Cal.com reported 3, with effective uptime of 98.16% and 100% respectively.
Data updated Nov 1, 2026 · How we score
| Metric | Acuity Scheduling | Cal.com |
|---|---|---|
| Reliability score | 45.5 | 86.2 |
| Rank (scheduling apps) | #10 | #6 |
| Uptime (90 days) | 98.16% | 100% |
| Incidents (90 days) | 7 | 3 |
| Partial / major outages | 3 | 2 |
| Avg time to resolve | 15h 44m | — |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Acuity Scheduling and Cal.com differ
- Acuity Scheduling reported 2.3× as many incidents as Cal.com over the last 90 days (7 vs 3).
- Acuity Scheduling had 3 partial or major outages, compared with 2 for Cal.com.
90-day uptime
Acuity Scheduling
Cal.com
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Acuity Scheduling incidents
- Degraded performanceOct 23, 2026 · resolved in 2h 16m
Acuity Scheduling / Custom Conversion Tracking integration maintenance
Affected: Acuity Scheduling
- InformationalOct 21, 2026 · resolved in <1m
- Partial outageSep 18, 2026 · resolved in 3d 22h
Acuity Scheduling Admin Mobile app crashing unexpectedly after iOS 27 updateofficial update ↗
Affected: Acuity Scheduling
- Partial outageSep 9, 2026 · resolved in <1m
Acuity Scheduling / Client Scheduling Page showing "SORRY" error
- Degraded performanceAug 20, 2026 · resolved in 17h 44m
Acuity Scheduling - Unable to Connect to Meta
Affected: Acuity Scheduling
- Degraded performanceAug 20, 2026 · resolved in 2h 4m
Acuity Scheduling / Google calendar sync delayed
Affected: Acuity Scheduling
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/
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 →