# Validity Everest alternatives: what AI models name instead, October 2026

GTM AI Recommendation Index, October 2026 Edition. 196 of the 252 answers in the 1 category where Validity Everest 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/validity-everest/alternatives/

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

- GlockApps: 51
- Google Postmaster Tools: 19
- MXToolbox: 9
- Mail-Tester: 8
- Instantly: 5
- Litmus: 5

## Email deliverability and testing tools

**Small business**: 82 of 84 answers did not name Validity Everest (Validity Everest is #15 of 15 at 0%).

- GlockApps: first choice in 25 of those 82
- Google Postmaster Tools: first choice in 13 of those 82
- MXToolbox: first choice in 6 of those 82
- Mail-Tester: first choice in 5 of those 82
- MailerCheck: first choice in 4 of those 82
- Email on Acid: first choice in 3 of those 82
- Instantly: first choice in 3 of those 82
- Litmus: first choice in 3 of those 82

**Mid-market**: 69 of 84 answers did not name Validity Everest (Validity Everest is #8 of 12 at 3%).

- GlockApps: first choice in 23 of those 69
- Google Postmaster Tools: first choice in 6 of those 69
- MailReach: first choice in 4 of those 69
- MXToolbox: first choice in 3 of those 69
- Mail-Tester: first choice in 3 of those 69
- Microsoft SNDS: first choice in 3 of those 69
- Folderly: first choice in 2 of those 69
- Yahoo Sender Hub: first choice in 2 of those 69

**Enterprise**: 45 of 84 answers did not name Validity Everest (Validity Everest is #1 of 14 at 45%).

- Everest: first choice in 4 of those 45
- Validity Engage: first choice in 4 of those 45
- GlockApps: first choice in 3 of those 45
- Inbox Monster: first choice in 2 of those 45
- Instantly: first choice in 2 of those 45
- Litmus: first choice in 2 of those 45
- Mailgun: first choice in 2 of those 45
- Sender: first choice in 2 of those 45

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