Transactional Email APIs · reliability comparison
Twilio SendGrid vs SparkPost (Bird): which is more reliable? (2026)
Twilio SendGrid is more reliable than SparkPost (Bird), scoring 94.8 vs 87.7 out of 100. Over the last 90 days Twilio SendGrid reported 5 incidents and SparkPost (Bird) reported 8, with effective uptime of 99.98% and 99.90% respectively. Twilio SendGrid resolves incidents faster on average (1h 9m).
Data updated Nov 1, 2026 · How we score
| Metric | Twilio SendGrid | SparkPost (Bird) |
|---|---|---|
| Reliability score | 94.8 | 87.7 |
| Rank (transactional email APIs) | #4 | #5 |
| Uptime (90 days) | 99.98% | 99.90% |
| Incidents (90 days) | 5 | 8 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | 1h 9m | 2h |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Twilio SendGrid and SparkPost (Bird) differ
- SparkPost (Bird) reported 60% more incidents than Twilio SendGrid over the last 90 days (8 vs 5).
- Twilio SendGrid fixes problems faster: 1h 9m on average, against 2h for SparkPost (Bird).
- Twilio SendGrid's longest incident on record lasted 2h 2m (Jul 8, 2026); SparkPost (Bird)'s lasted 7h 30m (Jul 24, 2026).
90-day uptime
Twilio SendGrid
SparkPost (Bird)
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Twilio SendGrid incidents
- MaintenanceOct 29, 2026 · resolved in 1h 26m
[Scheduled] Sendgrid Maintenance Impacting Delivery and Account Configuration
- Degraded performanceOct 24, 2026 · resolved in 50m
Azure Marketplace SendGrid Customers Experiencing Account Management Issues
- InformationalOct 15, 2026 · resolved in <1m
- InformationalOct 2, 2026 · resolved in <1m
- MaintenanceSep 4, 2026 · resolved in 7h 16m
Multiple delivery failures when sending emails to Microsoft or MS based recipients
- MaintenanceAug 24, 2026 · resolved in 22d
Recent SparkPost (Bird) incidents
- InformationalOct 30, 2026 · resolved in 22h 2m
Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)
Affected: SMTP Delivery - USA
- Degraded performanceOct 28, 2026 · resolved in 1h 1m
Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)
Affected: SMTP Delivery - USA
- Degraded performanceOct 11, 2026 · resolved in 3h 6m
Increased message delays in US and EU due to DNS resolution errors
Affected: SMTP Delivery - USA, SMTP Delivery - EUROPE
- Degraded performanceOct 1, 2026 · resolved in 31m
Affected: SMTP Delivery - USA, SMTP Delivery - EUROPE
- Degraded performanceSep 17, 2026 · resolved in 54m
Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)
Affected: SMTP Delivery - USA
- Degraded performanceSep 14, 2026 · resolved in 2h 27m
Health Score and Cohort data is delayed
Affected: SparkPost Application - USA, SparkPost Application - EUROPE
Other transactional email APIs to consider
- Mailjet · #1 · 100% uptime
- Mailtrap Email Sending · #2 · 99.99% uptime
- Loops · #3 · 99.98% uptime
- Mailgun · #6 · 99.84% uptime
See the full most reliable transactional email apis ranking →