CircleCI Uptime History
Measured by PulsAPI's own checks, not reported by CircleCI. Every figure below is computed over the 143 days in the last 365 that PulsAPI actually observed, from 2026-05-22 to 2026-10-11. Days nobody watched are left out rather than counted as perfect.
CircleCI Uptime at a Glance
- Measured uptime
- 100.00%
- Days with an issue
- 90
- Longest outage
- 52d 22h
- Mean recovery
- 15h 12m
across 143 observed days
days were not fully operational
single longest resolved incident
average time to resolve
Monthly CircleCI Uptime
Each month is the mean of its observed days. Months with few observed days are marked, because a short month is not evidence of a good one.
| Month | Uptime | Uptime bar | Days observed |
|---|---|---|---|
| October 2026 | 100.00% | 11partial | |
| September 2026 | 100.00% | 30 | |
| August 2026 | 100.00% | 31 | |
| July 2026 | 100.00% | 31 | |
| June 2026 | 100.00% | 30 | |
| May 2026 | 100.00% | 10partial |
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How This CircleCI Uptime Figure Is Measured
PulsAPI checks CircleCI continuously (every 60 seconds while it is moving) and records the result. A day's uptime is the share of that day's checks that came back fully operational, so a 20-minute outage shows up as a dip rather than being rounded away. The window figure is the mean of those daily values.
Two things this deliberately is not. It is not CircleCI's own published uptime, because vendors generally measure against their own SLA definitions, which usually exclude scheduled maintenance and often exclude partial degradation. And it is not a promise about the future: 143 days of history describes what happened, and the useful way to read it is alongside the incidents behind the dips.
Uptime measured this way is a mean of component uptimes where a vendor publishes components, so coverage matters as much as the percentage. That is why the observed-day count sits beside every figure on this page rather than in a footnote.
These measurements are published under CC BY 4.0. Quote or republish them freely, with attribution to PulsAPI.