Litmus vs Mail-Tester:Which is more popular?
In September 2026, Mail-Tester had more branded searches than Litmus among email deliverability testing tools worldwide. Mail-Tester had about 72,700 branded searches, while Litmus had 590. Mail-Tester made up 16.9% of all email deliverability testing tool searches we track, and Litmus accounted for 0.14%. When we asked ChatGPT and Google AI Overviews about email deliverability testing tools, Mail-Tester appeared in four of the five answers and Litmus in two. Mail-Tester was mentioned before Litmus in every answer that named either.
Who do people search for more?
Mail-Tester, about 123 searches for every 1 for Litmus
Who does AI mention more?
Mail-Tester, mentioned in 4 of 5 answers, Litmus in 2
Who does AI recommend more?
Mail-Tester, named ahead of Litmus in 3 of 3 answers
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Top email deliverability testing tools in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Mail-Tester was mentioned in four out of five: in all three ChatGPT answers and in one of the two Google AI Overviews. Litmus was mentioned in two out of five: in two of the three ChatGPT answers, but not in either of the two Google AI Overviews. Mail-Tester was listed before Litmus in every answer that named either.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
GlockApps1st- Mail-Tester2nd
MailReach3rd
MXToolbox4th
Litmus5th
Mailtrap6th
InboxAlly–
MailMonitor–
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
- Mail-Tester4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- GlockApps4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- MailReach3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- MXToolbox2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Mailtrap2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Litmus2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- InboxAlly0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- MailMonitor0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about email deliverability testing tools
5 answers
Asked ChatGPT
“Which email deliverability testing tool should I use?”
Asked ChatGPT
“What are the best email deliverability testing tools?”
Asked ChatGPT
“What's the best email deliverability testing tool for better inbox placement?”
Searched Google, AI Overview
“email deliverability tool”
Searched Google, AI Overview
“email spam test”
Not named in any answer:
Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.
Is Litmus or Mail-Tester more popular in search?
This chart shows how often people search Google for Litmus and Mail-Tester by name. Each line represents a brand's share of searches for all eight email deliverability testing tools we track, month by month, from English-language searches worldwide.
Share of searches by month for Mail-Tester, Litmus. The figures are in the table below the chart.
View monthly share of searches table
| Month | MXToolbox | Mail-Tester | Mailtrap | GlockApps | MailReach | InboxAlly | Litmus | MailMonitor |
|---|---|---|---|---|---|---|---|---|
| Oct 2025 | 66.5% | 16.6% | 13.8% | 1.5% | 0.97% | 0.24% | 0.19% | 0.19% |
| Nov 2025 | 68.6% | 16.6% | 11.7% | 1.5% | 1% | 0.2% | 0.2% | 0.2% |
| Dec 2025 | 66.2% | 16.6% | 13.9% | 1.5% | 1.2% | 0.29% | 0.19% | 0.24% |
| Jan 2026 | 68.3% | 17.1% | 11.8% | 1.2% | 1% | 0.22% | 0.16% | 0.2% |
| Feb 2026 | 68.2% | 17.1% | 11.7% | 1.2% | 1.2% | 0.24% | 0.16% | 0.2% |
| Mar 2026 | 68.8% | 16.6% | 11.8% | 1.2% | 1% | 0.17% | 0.16% | 0.16% |
| Apr 2026 | 70.5% | 14.4% | 12.1% | 1.3% | 1.3% | 0.21% | 0.17% | 0.14% |
| May 2026 | 68.5% | 16.6% | 11.8% | 1.2% | 1.2% | 0.2% | 0.16% | 0.2% |
| Jun 2026 | 68.3% | 16.7% | 11.7% | 1.5% | 1.2% | 0.2% | 0.16% | 0.16% |
| Jul 2026 | 68.1% | 17% | 11.7% | 1.5% | 1.2% | 0.21% | 0.13% | 0.13% |
| Aug 2026 | 67.1% | 17.6% | 11.6% | 1.5% | 1.5% | 0.29% | 0.2% | 0.2% |
| Sep 2026 | 70% | 16.9% | 9.8% | 1.5% | 1.3% | 0.24% | 0.14% | 0.14% |
How has the Litmus and Mail-Tester comparison changed over the last 12 months?
3 findings
- Mail-Tester was ahead of Litmus in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, Litmus’ share of searches among email deliverability testing tools worldwide moved from 0.19% to 0.14%, and its estimated monthly branded searches moved from 880 to 590.
- Across the 12 months ending September 2026, Mail-Tester’s share of searches among email deliverability testing tools worldwide moved from 16.6% to 16.9%, and its estimated monthly branded searches moved from 75.3K to 72.7K.
How did search popularity change for email deliverability testing tools worldwide in September 2026?
2 changes
In September 2026, Mail-Tester lost share of searches among email deliverability testing tools worldwide, from 17.6% to 16.9%.
Estimated monthly branded searches for Litmus worldwide fell 33% over 12 measured months, from 880 to 590 in September 2026.
How are branded searches counted?
5 search terms
Brandwave collects information about searches that people make online using Litmus’ and Mail-Tester’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.
Litmus
1 branded search term
- litmus email
Mail-Tester
4 branded search terms
- mail-tester
- mail-tester email testing
- mail-tester software
- mailtester
Other head-to-heads among email deliverability testing tools
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