Fax API comparison | mintfax
Compare fax APIs
mintfax is a developer-first fax service. This hub compares mintfax against the four fax APIs an evaluator is likely to have on their shortlist: Sinch (formerly Phaxio), Telnyx Programmable Fax, Documo (formerly mFax), and eFax Developer. Each sub-page lists what the competitor does well first, then states where mintfax leads on the send path, and closes with a “when mintfax is not the right call” section that describes the buyer profile the competitor serves better.
The comparison dimensions on each sub-page are the ones where mintfax leads: developer ergonomics, time-to-first-fax, flat per-page pricing, and HIPAA at every tier. mintfax is outbound-only, so the sub-pages also list inbound, CPaaS breadth, and bundled products as reasons to pick the competitor. The sub-pages contain the evidence and the verbatim competitor quotes. Pick the vendor you are evaluating.
Sub-pages
| Vendor | Page |
|---|---|
| Sinch fax alternative | For teams weighing Sinch’s Fax API (the Phaxio-derived v3 on the Sinch developer portal) against a fax-only service with signed webhooks and idempotent sends. |
| Telnyx fax alternative | For teams weighing Telnyx Programmable Fax against a fax-only service with idempotent sends, automatic retries, and no phone-number rental to make the first call. |
| Documo fax alternative | For teams weighing Documo (formerly mFax) against an API-first service where the fax API is available at every tier without a plan gate or add-on. |
| eFax Developer fax alternative | For teams weighing eFax Developer (the Enterprise API and the legacy Universal Outbound XML interface) against a self-serve fax-only service with public per-page pricing and a public error catalogue. |
Every sub-page cross-links to its migration guide in the docs. The four guides follow the same shape; Migrating from Sinch is the pattern the other three follow.
Quick-start
Pick the sub-page for the vendor you are evaluating. Or try mintfax in the sandbox. No card, no BAA needed to start.
mintfax offers a free, self-serve BAA at every tier. See the HIPAA page for storage boundaries, retention defaults, and subprocessors.