Mailsound
Paste your email HTML. Get a list of the CSS and HTML features that known email clients do not support, plus Gmail clipping, dark-mode, link and merge-tag problems, before you send.
Automated result for your review; see Terms.
A Litmus alternative and Email on Acid alternative
Mailsound is an email HTML checker and caniemail checker for freelance email developers and small agencies who used to pay for the entry tier of Litmus or Email on Acid just to catch client-specific rendering problems.
Pricing
| Plan | Monthly | Annual | Limit |
|---|---|---|---|
| Starter | EUR 12/month | EUR 120/year | 100 checks/month |
| Studio | EUR 29/month | EUR 290/year | Unlimited checks on this page; API key, 60 checks per hour and 1,000 per day |
Free: 5 free checks per day per person, 20 per network, and a daily ceiling for all free checks. No account and no email needed. Prices exclude VAT.
Support data from the Can I email project, MIT licence, dataset dated 2026-08-10.