Form & Survey Builders · reliability comparison
Fillout vs Formstack Forms: which is more reliable? (2026)
Fillout is more reliable than Formstack Forms, scoring 95.1 vs 90.6 out of 100. Over the last 90 days Fillout reported 4 incidents and Formstack Forms reported 4, with effective uptime of 99.98% and 99.93% respectively. Fillout resolves incidents faster on average (20m).
Data updated Nov 1, 2026 · How we score
| Metric | Fillout | Formstack Forms |
|---|---|---|
| Reliability score | 95.1 | 90.6 |
| Rank (form & survey builders) | #7 | #9 |
| Uptime (90 days) | 99.98% | 99.93% |
| Incidents (90 days) | 4 | 4 |
| Partial / major outages | 1 | 2 |
| Avg time to resolve | 20m | 1h 34m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Fillout and Formstack Forms differ
- Formstack Forms had 2 partial or major outages, compared with 1 for Fillout.
- Fillout fixes problems faster: 20m on average, against 1h 34m for Formstack Forms (4.8× quicker).
- Fillout's longest outage on record lasted 1h 14m (May 7, 2026); Formstack Forms's lasted 20m (Aug 25, 2026).
90-day uptime
Fillout
Formstack Forms
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Fillout incidents
- Degraded performanceSep 30, 2026 · resolved in 17m
Issue with custom domains for certain Fillout forms
Affected: Forms (respondent experience)
- Partial outageAug 29, 2026 · resolved in 18m
Investigating issue opening the Zite editor and dashboard
Affected: Forms (respondent experience), Zite App Editor
- Degraded performanceAug 26, 2026 · resolved in 11m
Investigating intermittent outage loading the editor and dashboard
Affected: Form editor, Workspaces, Settings & Admin, Zite App Editor
- Degraded performanceAug 19, 2026 · resolved in 33m
Investigating slowness in the Zite dashboard and login
Affected: Form editor, Workspaces, Settings & Admin, Zite App Editor
Recent Formstack Forms incidents
- Degraded performanceSep 17, 2026 · resolved in 4h 27m
Formstack Forms: Phone Number Field
Affected: Main Application
- Partial outageAug 25, 2026 · resolved in 20m
Affected: Email System (SendGrid)
- Degraded performanceAug 17, 2026 · resolved in 1h 8m
Formstack Forms: Confirmation Email Delivery Issues
Affected: Email System (SendGrid)
- Major outageAug 14, 2026 · resolved in 20m
Formstack Forms: Application Unavailable
Affected: Main Application
Other form & survey builders to consider
- Cognito Forms · #1 · 100% uptime
- Google Forms · #2 · 100% uptime
- Jotform · #3 · 100% uptime
- Paperform · #4 · 100% uptime