Appointment Scheduling Software · reliability comparison
OnceHub vs Square Appointments: which is more reliable? (2026)
OnceHub is more reliable than Square Appointments, scoring 74.8 vs 53.3 out of 100. Over the last 90 days OnceHub reported 2 incidents and Square Appointments reported 12, with effective uptime of 99.67% and 98.93% respectively. OnceHub resolves incidents faster on average (7h 8m).
Data updated Nov 1, 2026 · How we score
VS
| Metric | OnceHub | Square Appointments |
|---|---|---|
| Reliability score | 74.8 | 53.3 |
| Rank (scheduling apps) | #7 | #9 |
| Uptime (90 days) | 99.67% | 98.93% |
| Incidents (90 days) | 2 | 12 |
| Partial / major outages | 2 | 0 |
| Avg time to resolve | 7h 8m | 12h 49m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where OnceHub and Square Appointments differ
- Square Appointments reported 6× as many incidents as OnceHub over the last 90 days (12 vs 2).
- OnceHub had 2 partial or major outages, compared with 0 for Square Appointments.
- OnceHub fixes problems faster: 7h 8m on average, against 12h 49m for Square Appointments.
- OnceHub's longest outage on record lasted 2d 15h (Jun 3, 2026); Square Appointments's lasted 17h 43m (Apr 30, 2026).
90-day uptime
OnceHub
Square Appointments
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent OnceHub incidents
- Partial outageSep 8, 2026 · resolved in 13h 25m
Ongoing maintenance with one of our service providers is causing delays in the delivery of SMS two-factor authentication (2FA) codes, which official update ↗
Affected: User Application
- Partial outageAug 26, 2026 · resolved in 50m
We have identified an issue related to signing in using Microsoft or Google.
Affected: User Application
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 →