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An open-source CLI that checks SPF/DKIM/DMARC/MX records, verifies addresses via SMTP, and flags disposable/role-based emails, for developers validating deliverability before sending.
Open source
What to know▼
How it works
DNS health scoring, SMTP RCPT TO verification, domain typo correction, 29 RBL blacklist scans, ~74k disposable domain detection; includes REST API.
We check every product on this page once a day and record whether it still answers.
Instant, no-signup temporary email aliases with rotating domains to dodge blacklists, plus a public API for developers who want to build it into their own workflows.
FreeNo sign-upData stays with you
What to know▼
How it works
Creates custom, instant temporary email aliases (any inbox name) without sign-up, receiving emails in real-time from multiple rotating domains to avoid blacklists; also offers a public API and open-source frontend.
What's different
Rotating domains to avoid blacklists, plus no popups, timers, or tracking, unlike traditional temp mail tools.
Pricing
Free.
Best for
People needing disposable email for sign-up verifications or testing, and developers who want to build disposable email into their own workflows via the API.
We check every product on this page once a day and record whether it still answers.
Checks grammar and rewrites text right inside Gmail, LinkedIn, X and Reddit, using a Gemini API key you provide yourself, free and open source, no subscription.
FreeNo sign-upOpen source
What to know▼
How it works
Checks grammar and rewrites text inline on any website — Gmail, LinkedIn, X, Reddit — using your own free Google Gemini API key.
What's different
Free and open source, and runs on a Gemini key you supply yourself instead of a paid subscription.
Pricing
Free, no account or subscription.
Best for
People who want a Grammarly-style writing checker without paying for a subscription or handing over data to a third-party service.
We check every product on this page once a day and record whether it still answers.
Syncs a support mailbox into GitHub, GitLab or Linear so you can run a service desk from your existing issue tracker instead of paying for separate helpdesk software.
Open source
What to know▼
How it works
Syncs a support mailbox to your issue tracker over standard IMAP/SMTP, turning incoming emails into tracked issues so you can run a service desk from GitHub, GitLab, or Linear.
What's different
Open-source and works with the automation pipelines you've already built in your issue tracker, instead of adding a separate per-seat helpdesk tool.
Best for
Teams already living in GitHub, GitLab, or Linear who want to handle customer email without buying dedicated helpdesk software.
We check every product on this page once a day and record whether it still answers.
A desktop email client that syncs your mailbox into local SQLite and searches it by meaning without cloud calls. Free, open source, no account or telemetry, for Gmail, Outlook or any IMAP inbox.
FreeNo sign-upOpen source
What to know▼
How it works
Syncs your whole mailbox into a local SQLite database and lets you search it by meaning without any cloud calls, with keyboard-speed triage. Supports Gmail, Outlook, and any IMAP account, plus a CalDAV calendar.
What's different
Open source with no account and no telemetry.
Pricing
Free.
Best for
People who want a fast, keyboard-driven email client that keeps their mailbox local.
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