Tag
Tools in this catalog tagged email. Honest Catch, not a roundup.
7 tools · the Catch, not a ranking
- ResendEmail API designed for developers
Newer service means less track record. Deliverability depends on your domain reputation as much as theirs. Feature set is smaller than established players.
- ListmonkAGPL-3.0 self-hosted newsletters and transactional mail
AGPL-3.0 is copyleft — network use means you share modifications. You operate Postgres, SMTP, and bounces. There is no official hosted Listmonk Cloud.
- PlunkAGPL-3.0 transactional email, workflows, and broadcasts
AGPL-3.0 is copyleft. Hosted Free keeps Plunk branding. This is not Resend at volume — 1k/mo is the free wall, then $0.001/email. Self-host means you bring SES or equivalent.
- PostalMIT self-hosted mail delivery: SMTP + HTTP API
Self-hosted mail delivery SMTP+HTTP API — not Resend hosted tx email, not Plunk Node email, not Listmonk newsletter app. You own deliverability and IP reputation. Distinct from Resend, Plunk, and Listmonk.
- Hyvor RelayAGPL-3.0 email relay; Self-Hosted Free Forever unlimited
Do NOT claim Cloud free. Self-host unlimited is the pitch. Vs Postal full mail server and Plunk Node email. Distinct from Postal and Plunk.
- OneSignalMulti-channel messaging SaaS; Free now capped at 1k mobile MAU
Closed SaaS. LOUD (2026): Free mobile push/in-app limited to 1,000 MAU (new orgs Sep 1, existing Oct 1) — overage pauses mobile until Growth (from about $19/mo + per-MAU). Not Novu/Knock twins. SMS/RCS extra.
- MagicBellMultichannel notification API + inbox; Builder free to 1k deliveries/mo
Closed SaaS — not Novu self-host. LOUD: Startup jumps to $249/mo (50k deliveries; $0.0025 overage). Multi-channel = multi-delivery counts. You still pay SendGrid/Twilio/FCM underneath. Not Knock twin for complex workflow DAGs.