# Email on Acid alternatives: what AI models name instead, October 2026

GTM AI Recommendation Index, October 2026 Edition. 223 of the 252 answers in the 1 category where Email on Acid holds a standing named it neither first nor as an alternative; these are the first choices those answers made. Page: https://gtm-ai-index.com/vendors/email-on-acid/alternatives/

## Named instead, most often (every category and segment added)

- GlockApps: 47
- Validity Everest: 29
- Google Postmaster Tools: 20
- MXToolbox: 9
- Litmus: 7
- Mail-Tester: 7

## Email deliverability and testing tools

**Small business**: 75 of 84 answers did not name Email on Acid (Email on Acid is #14 of 15 at 0%).

- GlockApps: first choice in 20 of those 75
- Google Postmaster Tools: first choice in 13 of those 75
- MXToolbox: first choice in 6 of those 75
- Mail-Tester: first choice in 4 of those 75
- Instantly: first choice in 3 of those 75
- Litmus: first choice in 3 of those 75
- MailReach: first choice in 3 of those 75
- MailerCheck: first choice in 3 of those 75

**Mid-market**: 74 of 84 answers did not name Email on Acid (Email on Acid is #10 of 12 at 0%).

- GlockApps: first choice in 25 of those 74
- Google Postmaster Tools: first choice in 7 of those 74
- MailReach: first choice in 4 of those 74
- MXToolbox: first choice in 3 of those 74
- Mail-Tester: first choice in 3 of those 74
- Microsoft SNDS: first choice in 3 of those 74
- Folderly: first choice in 2 of those 74
- Validity Everest: first choice in 2 of those 74

**Enterprise**: 74 of 84 answers did not name Email on Acid (Email on Acid is #12 of 14 at 0%).

- Validity Everest: first choice in 27 of those 74
- Litmus: first choice in 4 of those 74
- Validity Engage: first choice in 4 of those 74
- Everest: first choice in 3 of those 74
- Instantly: first choice in 3 of those 74
- Mailgun: first choice in 3 of those 74
- SendGrid: first choice in 3 of those 74
- GlockApps: first choice in 2 of those 74

Published under CC BY 4.0. The output is the models' output; nothing here is a recommendation by the index.