#1 Developer ToolsUnknown
MailerSend.com — alternative #1 to Inboxes App
Email API, SMTP, 500 emails/month free for transactional emails, 100 API requests/day
Catalogue source
Recorded alternatives
Alternatives to Inboxes App
Every candidate below sits in Developer Tools. What ends up on this page is decided entirely by a recorded score — not by bidding, not by editor taste. Review both records, check current vendor terms, then decide.
#2 Developer ToolsUnknown
mailsac.com — alternative #2 to Inboxes App
Free API for temporary email testing, free public email hosting, outbound capture, email-to-slack/websocket/webhook (1,500 monthly API limit...
Catalogue source
#3 Developer ToolsUnknown
Mailtrap.io — alternative #3 to Inboxes App
Email API and SMTP with 4,000 emails/month free, limited to 150 emails/day. Email Marketing includes 500 contacts and 1,500 emails/month. Em...
Catalogue source
#4 Developer ToolsUnknown
Resend — alternative #4 to Inboxes App
Transactional emails API for developers. 3,000 emails/month, 100 emails/day free, one custom domain.
Catalogue source
Questions about this page
How were these alternatives selected?
Each candidate is a live catalogue record in the same primary category, picked by a deterministic score that Oryxen records in its catalogue: how many meaningful words the two listings share, whether their pricing classes oppose (a paid product against a free one), whether both are open source, and whether either record is featured. The same catalogue state always produces the same list — no randomness, no manual ranking.
Are these alternatives ranked by payment?
No. Rows are ordered only by the recorded score, highest first, with alphabetical ties — payment never influences the order, nothing here is paid placement, and Oryxen charges no listing or placement fee.
Always verify current terms with Inboxes App directly — Oryxen records pricing classes, not live quotes.