Apps similar to Maildog.co include MailMoxie, which has a free version. Other options are Litmus, Email on Acid, Unspam.email and proofa.io. In total there are nine Email Marketing Services like Maildog.co for the web and self-hosting.
MailMoxie is an advanced Email Governance platform designed for the 2026 inbox landscape. It serves as a diagnostic layer for your marketing stack, ensuring every email you send is technically perfect and accessible to all.
United States
Litmus shows you exactly how your designs look on every platform, across every popular web browser. (And the not-so-popular ones.)
United Kingdom
Create a virtual simulation of your email in the top 15, most used email clients! Our Email Acid Test will analyze your code and identify exactly which HTML tags and/or CSS properties are not supported by each email client.
United States
Unspam.email is an online spam tester tool for emails. It helps to improve the deliverability and reputation of your email campaigns.
AI-powered email QA tool that catches typos, broken links, layout issues, and tone problems before send at a fraction of Litmus or Email on Acid's cost.
United Kingdom
Vetter allows you to safely determine whether an email you wish to send will be marked as spam. This is done by testing the email against a network of real email accounts, and checking whether it ended up in inboxes or was spammed.
Find out if your email is likely to trigger spam filters. Run a free email spam and security test in less than a minute with MailGenius.com
Free real-mailbox inbox placement testing across 9 providers including Gmail, Outlook, Mail.ru, and Yandex.
Kazakhstan
GlockApps provides everything you need to help troubleshoot and monitor inbox placement, email reputation, and campaign performance so that you can adjust your strategic and tactical plans, improve results and increase ROI.
United States
