Appointment Scheduling Software · reliability comparison
Calendly vs OnceHub: which is more reliable? (2026)
Calendly is more reliable than OnceHub, scoring 100.0 vs 74.8 out of 100. Over the last 90 days Calendly reported 0 incidents and OnceHub reported 2, with effective uptime of 100% and 99.67% respectively.
Data updated Nov 1, 2026 · How we score
| Metric | Calendly | OnceHub |
|---|---|---|
| Reliability score | 100.0 | 74.8 |
| Rank (scheduling apps) | #1 | #7 |
| Uptime (90 days) | 100% | 99.67% |
| Incidents (90 days) | 0 | 2 |
| Partial / major outages | 0 | 2 |
| Avg time to resolve | — | 7h 8m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Calendly and OnceHub differ
- Calendly reported no incidents in the last 90 days, while OnceHub reported 2.
- OnceHub had 2 partial or major outages, compared with 0 for Calendly.
- Calendly's longest incident on record lasted 23h 11m (Jul 8, 2026); OnceHub's lasted 2d 15h (Jun 3, 2026).
90-day uptime
Calendly
OnceHub
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Calendly incidents
- MaintenanceSep 1, 2026 · ongoing
Scheduled maintenance on Sunday, September 6, 2026
Affected: calendly.com
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
Other scheduling apps to consider
- Doodle · #2 · 100% uptime
- SavvyCal · #3 · 100% uptime
- Sign In Scheduling (formerly 10to8) · #4 · 100% uptime
- YouCanBookMe · #5 · 100% uptime
See the full most reliable appointment scheduling software ranking →