App Hosting Platforms · reliability comparison
Fly.io vs Heroku: which is more reliable? (2026)
Heroku is more reliable than Fly.io, scoring 91.0 vs 45.7 out of 100. Over the last 90 days Fly.io reported 53 incidents and Heroku reported 6, with effective uptime of 98.33% and 99.95% respectively. Heroku resolves incidents faster on average (1h 43m).
Data updated Nov 2, 2026 · How we score
| Metric | Fly.io | Heroku |
|---|---|---|
| Reliability score | 45.7 | 91.0 |
| Rank (app hosting platforms) | #10 | #2 |
| Uptime (90 days) | 98.33% | 99.95% |
| Incidents (90 days) | 53 | 6 |
| Partial / major outages | 19 | 0 |
| Avg time to resolve | 2h 34m | 1h 43m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Fly.io and Heroku differ
- Fly.io reported 8.8× as many incidents as Heroku over the last 90 days (53 vs 6).
- Fly.io had 19 partial or major outages, compared with 0 for Heroku.
- Heroku fixes problems faster: 1h 43m on average, against 2h 34m for Fly.io.
- Fly.io's longest outage on record lasted 18h 40m (Sep 23, 2026); Heroku's lasted 5h 4m (Oct 28, 2026).
90-day uptime
Fly.io
Heroku
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Fly.io incidents
- Degraded performanceNov 1, 2026 · resolved in 2h 10m
Outbound IPv4 connectivity failures in ARN, JNB, and GRU
Affected: ARN - Stockholm, Sweden, JNB - Johannesburg, South Africa, GRU - Sao Paulo, Brazil
- Degraded performanceOct 30, 2026 · resolved in 1h 28m
Slow image pulls delaying Machine starts in IAD
Affected: IAD - Ashburn, Virginia (US), Deployments
- InformationalOct 29, 2026 · resolved in <1m
- Degraded performanceOct 29, 2026 · resolved in 48m
Elevated issues with the Machines API
Affected: Machines API, Dashboard, Customer Applications
- InformationalOct 29, 2026 · resolved in 4h 48m
- InformationalOct 26, 2026 · resolved in 6h 6m
Recent Heroku incidents
- Degraded performanceOct 28, 2026 · resolved in 5h 4m
- Degraded performanceSep 24, 2026 · resolved in 1h 28m
- Degraded performanceAug 25, 2026 · resolved (duration not published)
- Degraded performanceAug 18, 2026 · resolved (duration not published)
- Degraded performanceAug 10, 2026 · resolved in 20m
- Degraded performanceAug 6, 2026 · resolved in 2m
Other app hosting platforms to consider
- DigitalOcean App Platform · #1 · 99.98% uptime
- Koyeb · #3 · 99.64% uptime
- Render · #4 · 99.71% uptime
- Netlify · #5 · 99.71% uptime