Best tool
Best tool to make sure, emails look perfect on any mail client.
By Finn N.
Monday, November 9, 2026 · Customer reviews of US businesses

The Fair Hearing score
Average
65 reviews
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Honesty, pricing, process and quality scores appear once 5 customers have rated them.
Use Email on Acid to test your emails across the most popular clients, apps and devices, then go further to measure performance, find and fix errors - even if you don't know HTML. Free Trial.
Email on Acid (emailonacid.com) has 65 customer reviews on The Fair Hearing, with an average rating of 3.8 out of 5.
Showing 29 reviews with 5 stars · Clear filters
Best tool to make sure, emails look perfect on any mail client.
By Finn N.
Great product. Excellent support. Fantastic blog content. Couldn't function at work without it.
By Ben
A very useful tool to detect and resolve design issues on a number of different email clients.
By Wren
Quick response from EOA team, appreciated!!!
By Karthick
Great way to test email layouts in lots of different email clients. We use it very often and it's become an indispensable tool.
By Dave
Email on Acid had helped us optimize our emails across all devices and email platforms so that they render exactly how we want them too.
By Sara
Great UI and UX. Seems quicker, not to mention cheaper than their big rival.
By James M.
Invaluable testing insight and super intuitive to use.
By Kai