Sites and apps similar to GlockApps include MailMoxie, which has a free version. Other options are Unspam.email, InboxGreen, Inbox Placement Test and MailGenius. In total there are nine Email Marketing Services like GlockApps for Chrome OS, self-hosting, Mac, Windows and Linux.
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.
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Unspam.email is an online spam tester tool for emails. It helps to improve the deliverability and reputation of your email campaigns.
InboxGreen checks whether your emails reach the inbox or land in spam. Test SPF, DKIM and DMARC authentication records for any domain instantly, no account required.
Free real-mailbox inbox placement testing across 9 providers including Gmail, Outlook, Mail.ru, and Yandex.
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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
Maildog monitors your email sending and provides you with actionable feedback on what to do to improve email deliverability.
Mailfox is an easy-to-use tool that uses webhooks from Mailgun, Sendgrid, Postmark, Resend, Mailersend and Brevo to track bounced and missed emails.
If emails bounce or are not delivered, it will notify you immediately and give you instructions on how to fix the problem.
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.
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