Oh Fax vs mFax: price, account, and agent support
An honest comparison of Oh Fax and mFax for sending a fax in the US or Canada, with prices checked Oct 24, 2026 on mFax's own site.
Oh Fax: $1.00 per fax by card for up to 25 pages ($0.02 per page after that, 30-page cap), or $0.02 per page from a prepaid balance or USDC. No subscription, no fax number, and no account needed for card or USDC payments.
mFax pricing
mFax is Documo's product, and mfax.io/pricing now shows Documo's plans. Solo costs $25/month billed annually for 300 pages, with $0.15 per extra page. Business costs $100/month for 1,500 pages and adds API access. Enterprise costs $300/month for 6,000 pages. There is a 14-day free trial (mFax / Documo pricing, checked Oct 24, 2026).
Price per fax (US/Canada, outbound)
| Pages | mFax | Oh Fax |
|---|---|---|
| 1 page | $25/mo subscription | $1.00 card / $0.02 balance or USDC |
| 3 pages | $25/mo subscription | $1.00 card / $0.06 balance or USDC |
| 10 pages | $25/mo subscription | $1.00 card / $0.20 balance or USDC |
Oh Fax prices come from our pricing page.
At a glance
| mFax | Oh Fax | |
|---|---|---|
| Account required | Yes. | No for card or USDC payments. An API key with a prepaid balance is optional. |
| API | On Business and higher plans. | REST API at app.ohfax.com/api/v1 |
| AI agent / MCP | None published. | Remote MCP at https://app.ohfax.com/mcp. Paid MPP requests need no account. |
| Coverage | See mFax | US and Canada only, up to 30 pages per fax. Outbound only. |
When mFax is better
- You're a healthcare team that needs EHR integration or document processing.
- You receive a lot of faxes and want them classified automatically.
When Oh Fax is better
- You want an AI agent (Claude, ChatGPT, Cursor, Codex) to send the fax without signing up or keeping a subscription.
- You send faxes occasionally and want to pay per fax.
- You want an exact quote before you pay, and an automatic refund if the fax can't be delivered.
Switch in a minute
Add https://app.ohfax.com/mcp to your agent as an MCP server, or open ohfax.com and upload a PDF. See the MCP setup guide.
Sources
- mFax / Documo pricing (checked Oct 24, 2026)
The competitor prices above are taken from each competitor's own published pages. Check them before you rely on them, because they can change.