Litmus vs Warmup Inbox
Side-by-side from the Top 11 ranking of GlockApps vs Validity vs Mail-tester: 11 Best Email Deliverability Tools 2026. Last verified June 15, 2026.
The short answer
Litmus ranks higher on Top 11 (#7 vs #11) for Email marketers and developers improving inbox placement rates. A strong email creation and analytics platform with good, integrated deliverability checks.
At a glance
| Litmus | Warmup Inbox | |
|---|---|---|
| Top 11 rank | #7 / GlockApps vs Validity vs Mail-tester: 11 Best Email Deliverability Tools 2026 | #11 / GlockApps vs Validity vs Mail-tester: 11 Best Email Deliverability Tools 2026 |
| Score (out of 9.4) | 7.9 | — |
| Best for | Integrated design and deliverability | Proactive reputation building |
| Pricing | $$$ ($199 to $499/mo) | $ ($19 to $199/mo) |
| HQ | Cambridge, USA | Wilmington, USA |
| Founded | 2005 | 2020 |
Litmus
A strong email creation and analytics platform with good, integrated deliverability checks.
www.litmus.com/See full entry in GlockApps vs Validity vs Mail-tester: 11 Best Email Deliverability Tools 2026
Warmup Inbox
A unique tool that automates the process of warming up new email accounts to build sender reputation.
www.warmupinbox.com/See full entry in GlockApps vs Validity vs Mail-tester: 11 Best Email Deliverability Tools 2026
Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.