Transactional Email APIs · reliability comparison
Loops vs Mailchimp Transactional (Mandrill): which is more reliable? (2026)
Loops is more reliable than Mailchimp Transactional (Mandrill), scoring 96.3 vs 90.6 out of 100. Over the last 90 days Loops reported 1 incident and Mailchimp Transactional (Mandrill) reported 3, with effective uptime of 99.98% and 99.93% respectively. Loops resolves incidents faster on average (1h 34m).
Data updated Nov 1, 2026 · How we score
VS
| Metric | Loops | Mailchimp Transactional (Mandrill) |
|---|---|---|
| Reliability score | 96.3 | 90.6 |
| Rank (transactional email APIs) | #3 | #5 |
| Uptime (90 days) | 99.98% | 99.93% |
| Incidents (90 days) | 1 | 3 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | 1h 34m | 3h 4m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Loops and Mailchimp Transactional (Mandrill) differ
- Mailchimp Transactional (Mandrill) reported 3× as many incidents as Loops over the last 90 days (3 vs 1).
- Loops fixes problems faster: 1h 34m on average, against 3h 4m for Mailchimp Transactional (Mandrill) (2.0× quicker).
- Loops's longest outage on record lasted 46m (Mar 2, 2026); Mailchimp Transactional (Mandrill)'s lasted 4h 26m (Sep 15, 2026).
90-day uptime
Loops
Mailchimp Transactional (Mandrill)
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Loops incidents
- Degraded performanceSep 11, 2026 · resolved in 1h 34m
Delay in email metric processing
Affected: App
Recent Mailchimp Transactional (Mandrill) incidents
- Degraded performanceSep 17, 2026 · resolved in 38m
Delayed Deliveries via Mandrill
Affected: Delayed Deliveries via Mandrill
- Degraded performanceSep 15, 2026 · resolved in 4h 26m
Delayed Deliveries via Mandrill
Affected: Delayed Deliveries via Mandrill
- Degraded performanceSep 1, 2026 · resolved in 4h 8m
Affected: Mandrill/Transactional Delays
Full Mailchimp Transactional (Mandrill) reliability report →
Other transactional email APIs to consider
- Mailjet · #1 · 100% uptime
- Mailtrap Email Sending · #2 · 99.99% uptime
- Twilio SendGrid · #4 · 99.98% uptime
- SparkPost (Bird) · #6 · 99.90% uptime
See the full most reliable transactional email apis ranking →