Appointment Scheduling Software · reliability comparison
Calendly vs Sign In Scheduling (formerly 10to8): which is more reliable? (2026)
Calendly and Sign In Scheduling (formerly 10to8) are effectively tied on reliability (100.0 vs 100.0). Over the last 90 days Calendly reported 0 incidents and Sign In Scheduling (formerly 10to8) reported 0, with effective uptime of 100% and 100% respectively.
Data updated Nov 1, 2026 · How we score
VS
| Metric | Calendly | Sign In Scheduling (formerly 10to8) |
|---|---|---|
| Reliability score | 100.0 | 100.0 |
| Rank (scheduling apps) | #1 | #4 |
| Uptime (90 days) | 100% | 100% |
| Incidents (90 days) | 0 | 0 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | — | — |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Calendly and Sign In Scheduling (formerly 10to8) differ
- Calendly's longest incident on record lasted 23h 11m (Jul 8, 2026); Sign In Scheduling (formerly 10to8)'s lasted 3h 39m (Jan 23, 2026).
90-day uptime
Calendly
Sign In Scheduling (formerly 10to8)
- 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 Sign In Scheduling (formerly 10to8) incidents
No incidents reported by Sign In Scheduling (formerly 10to8) in the last 90 days.
Full Sign In Scheduling (formerly 10to8) reliability report →
Other scheduling apps to consider
- Doodle · #2 · 100% uptime
- SavvyCal · #3 · 100% uptime
- YouCanBookMe · #5 · 100% uptime
- Cal.com · #6 · 100% uptime
See the full most reliable appointment scheduling software ranking →