Code Hosting & CI/CD · reliability comparison

CircleCI vs Semaphore: which is more reliable? (2026)

CircleCI is more reliable than Semaphore, scoring 59.2 vs 54.9 out of 100. Over the last 90 days CircleCI reported 28 incidents and Semaphore reported 22, with effective uptime of 99.19% and 98.92% respectively. CircleCI resolves incidents faster on average (2h 26m).

Data updated Nov 1, 2026 · How we score

CircleCI

59.2/100

Operational

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Semaphore

54.9/100

Operational

Visit Semaphore ↗
VS
MetricCircleCISemaphore
Reliability score59.254.9
Rank (code hosting & CI platforms)#6#9
Uptime (90 days)99.19%98.92%
Incidents (90 days)2822
Partial / major outages36
Avg time to resolve2h 26m4h 2m
Outages we detected00
Transparency score100/100100/100

Where CircleCI and Semaphore differ

  • CircleCI reported 27% more incidents than Semaphore over the last 90 days (28 vs 22).
  • Semaphore had 6 partial or major outages, compared with 3 for CircleCI.
  • CircleCI fixes problems faster: 2h 26m on average, against 4h 2m for Semaphore.
  • CircleCI's longest outage on record lasted 14h 36m (Oct 9, 2026); Semaphore's lasted 10h 5m (Aug 31, 2026).

90-day uptime

CircleCI

Aug 4, 2026: 97.36% uptime, 1 incident (Degraded performance)Aug 5, 2026: 97.47% uptime, 1 incident (Degraded performance)Aug 6, 2026 – Aug 11, 2026: no incidentsAug 12, 2026: 99.89% uptime, 1 incident (Degraded performance)Aug 13, 2026 – Aug 16, 2026: no incidentsAug 17, 2026: 89.22% uptime, 2 incidents (Partial outage)Aug 18, 2026 – Aug 24, 2026: no incidentsAug 25, 2026: 100% uptime, 1 incident (Degraded performance)Aug 26, 2026: 99.72% uptime, 1 incident (Degraded performance)Aug 27, 2026 – Sep 3, 2026: no incidentsSep 4, 2026: 98.96% uptime, 1 incident (Degraded performance)Sep 5, 2026 – Sep 9, 2026: no incidentsSep 10, 2026: 99.98% uptime, 1 incident (Degraded performance)Sep 11, 2026 – Sep 13, 2026: no incidentsSep 14, 2026: 99.37% uptime, 1 incident (Degraded performance)Sep 15, 2026: 98.53% uptime, 1 incident (Degraded performance)Sep 16, 2026: 97.13% uptime, 1 incident (Degraded performance)Sep 17, 2026 – Sep 20, 2026: no incidentsSep 21, 2026: 99.50% uptime, 1 incident (Degraded performance)Sep 22, 2026 – Sep 30, 2026: no incidentsOct 1, 2026: 98.96% uptime, 1 incident (Degraded performance)Oct 2, 2026 – Oct 5, 2026: no incidentsOct 6, 2026: 88.94% uptime, 1 incident (Partial outage)Oct 7, 2026: 98.43% uptime, 3 incidents (Degraded performance)Oct 8, 2026: 97.75% uptime, 1 incident (Degraded performance)Oct 9, 2026: 74.06% uptime, 1 incident (Partial outage)Oct 10, 2026: 95.52% uptime, 1 incident (Partial outage)Oct 11, 2026 – Oct 13, 2026: no incidentsOct 14, 2026: 99.23% uptime, 1 incident (Degraded performance)Oct 15, 2026 – Oct 19, 2026: no incidentsOct 20, 2026: 98.58% uptime, 1 incident (Degraded performance)Oct 21, 2026: 99.12% uptime, 1 incident (Degraded performance)Oct 22, 2026 – Oct 27, 2026: no incidentsOct 28, 2026: 99.34% uptime, 1 incident (Degraded performance)Oct 29, 2026 – Nov 1, 2026: no incidents
90 days ago99.190% average daily uptimeToday

Semaphore

Aug 4, 2026: 97.03% uptime, 1 incident (Partial outage)Aug 5, 2026 – Aug 17, 2026: no incidentsAug 18, 2026: 98.32% uptime, 1 incident (Degraded performance)Aug 19, 2026 – Aug 20, 2026: no incidentsAug 21, 2026: 96.75% uptime, 1 incident (Partial outage)Aug 22, 2026 – Aug 24, 2026: no incidentsAug 25, 2026: 96.12% uptime, 1 incident (Degraded performance)Aug 26, 2026: no incidentsAug 27, 2026: 94.88% uptime, 2 incidents (Major outage)Aug 28, 2026: 98.82% uptime, 1 incident (Degraded performance)Aug 29, 2026 – Aug 30, 2026: no incidentsAug 31, 2026: 57.98% uptime, 1 incident (Major outage)Sep 1, 2026: no incidentsSep 2, 2026: 92.59% uptime, 2 incidents (Degraded performance)Sep 3, 2026: 89.57% uptime, 1 incident (Degraded performance)Sep 4, 2026 – Sep 14, 2026: no incidentsSep 15, 2026: 98.73% uptime, 1 incident (Degraded performance)Sep 16, 2026: no incidentsSep 17, 2026: 97.79% uptime, 2 incidents (Partial outage)Sep 18, 2026 – Oct 12, 2026: no incidentsOct 13, 2026: 94.61% uptime, 2 incidents (Degraded performance)Oct 14, 2026: 98.66% uptime, 1 incident (Degraded performance)Oct 15, 2026 – Oct 20, 2026: no incidentsOct 21, 2026: 97.64% uptime, 1 incident (Degraded performance)Oct 22, 2026: 98.59% uptime, 1 incident (Degraded performance)Oct 23, 2026 – Oct 25, 2026: no incidentsOct 26, 2026: 98.11% uptime, 2 incidents (Degraded performance)Oct 27, 2026: 98.18% uptime, 1 incident (Degraded performance)Oct 28, 2026: no incidentsOct 29, 2026: 99.28% uptime, 1 incident (Degraded performance)Oct 30, 2026: 99.82% uptime, 1 incident (Degraded performance)Oct 31, 2026 – Nov 1, 2026: no incidents
90 days ago98.928% average daily uptimeToday

Recent CircleCI incidents

Full CircleCI reliability report →

Recent Semaphore incidents

Full Semaphore reliability report →

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