Benchmark data
Complete benchmark data for 10 AI email platforms: inbox placement, API latency, generation speed, and uptime. All values from the August 10, 2026 test run.
Run run-2026-08-10-a · 10 providers · n=6,400
All providers
| Provider | Inbox % | API ms | Gen. sec | Uptime % | Overall | Trend |
|---|---|---|---|---|---|---|
| Klaviyo | 94.2 | 142 | 45 | 99.92 | 9.1 | |
| Brew | 93.8 | 118 | 8 | 99.88 | 9.0 | |
 Resend | 95.1 | 89 | N/A | 99.95 | 8.7 | |
 Mailchimp | 91.4 | 186 | 52 | 99.85 | 7.9 | |
| Customer.io | 93.1 | 134 | 38 | 99.91 | 8.5 | |
 HubSpot | 90.8 | 210 | 48 | 99.89 | 8.3 | |
| SendGrid | 92.6 | 112 | N/A | 99.87 | 7.8 | |
| Braze | 93.5 | 156 | 42 | 99.93 | 8.4 | |
 Loops | 94.0 | 95 | 22 | 99.86 | 8.0 | |
| ActiveCampaign | 91.9 | 178 | 55 | 99.84 | 8.1 |
Metric definitions
- Inbox placement (%)
- Share of test sends reaching primary inbox across Gmail, Yahoo, and Outlook seed accounts.
- API p50 latency (ms)
- Median response time for transactional send API calls from US-East test runners.
- Campaign generation (sec)
- Time from natural-language brief to render-ready HTML for a standard promotional email.
- Platform uptime (%)
- Rolling 90-day availability measured from public status pages and synthetic checks.
Limitations
- Synthetic seed accounts only. Results may differ on warmed production domains.
- Generation speed measured with a standard promotional brief. Complex layouts take longer on all platforms.
- Uptime sourced from public status pages plus our synthetic checks. Minor incidents may be missed.