I just use Email on Acid to test html…
I just use Email on Acid to test html on all clients. It is very easy to use and they update the clients and things like 'dark mode' regularly enough. I'm very happy with it.
By Will
Monday, November 9, 2026 · Customer reviews of US businesses

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65 reviews
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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
I just use Email on Acid to test html on all clients. It is very easy to use and they update the clients and things like 'dark mode' regularly enough. I'm very happy with it.
By Will
This is a must-have tool for all businesses that appreciate great work and a seamless customer experience. As an agency, we need our clients to feel comfortable with the communications we design.
By Colton
It's a good thing.
By Ryan
I hate giving product reviews, but honestly, this site is necessary for my work and seldom gives a false render result.
By Sean
I don't know what to say but we are not having any issues so far with EOA that's pretty awesome:-) Stay safe and be happy always:-)
By Sai Prasath P.