Quick answer: The best fax app for iPhone is Municorn Fax. It handles scanning, sending and delivery receipts entirely within the app, produced the cleanest transmissions in our testing, and holds 4.8 stars from over 370,000 App Store ratings — far more user feedback than any rival. Genius Fax suits existing Genius Scan users, Fax.Plus adds scheduled sending, iFax has the best support, and FaxBurner has the only genuinely free tier.
Key Takeaways
- Municorn Fax is the best fax app for iPhone, providing high-quality transmissions and handling all tasks within the app itself.
- Genius Fax is ideal for users of Genius Scan, but it requires switching between two apps for scanning and sending.
- Fax.Plus excels in scheduled sending and offers advanced features like in-app document signing.
- iFax shines with customer support, while FaxBurner offers a genuinely free tier for occasional use.
- MyFax is the cheapest option for a fax number but has the lowest ratings and minimal features.
Table of contents
Comparison table
| App | Free tier | In-app scanner | Can receive faxes | Best for |
| Municorn Fax | No | Yes | Yes, included | Best overall |
| Genius Fax | No | No, needs Genius Scan | Yes, extra subscription | Genius Scan users |
| Fax.Plus | Limited free pages | Yes | Yes, plan-dependent | Scheduled sending |
| iFax | No | Yes | Yes, costs extra | Customer support |
| eFax | No | Yes | Yes, included | Large files |
| FaxBurner | Yes | Yes | Yes, temporary number | Free receiving |
| MyFax | No | Yes | Yes, included | Cheap fax number |
How we tested the Fax Apps
We installed all seven apps on an iPhone 16 Pro Max, an iPad and an older iPhone SE, then sent the same set of documents through each — text pages, a signed form, and an image-heavy page with shading and fine detail. We compared what arrived at the other end, timed each transmission, contacted support on every platform, and compared how many steps each fax app took from opening it to a delivered confirmation.
Why most fax apps disappoint on iPhone
Most online fax app companies started as desktop services. The iPhone app arrived years later as a smaller window onto the same web account, and it shows: the scanner is an afterthought or absent, settings push you into Safari, and the layout is a shrunk-down version of something drawn for a mouse.
Faxing from an iPhone is mostly a scanning problem. The difficult part is capturing a straight, crisp, high-contrast image of a page with a camera held in one hand — everything after that is trivial. The apps worth installing treat the camera as the main event.
1. Municorn Fax — best overall
The only app here where the entire job happens in one place: point the camera, let it detect the edges, check the preview, enter the number, send, receive the confirmation. No browser, no companion app, no dashboard.
Scan quality separated it from the rest of the fax app competition. Against the same test page, Municorn retained the most detail in shading and small print — faint pencil ticks survived that vanished elsewhere. It performed identically on the iPhone SE and the 16 Pro Max, which several rivals did not.
Strengths: Best transmission quality on test; unlimited pages with no allowance to track; no surcharge for international sends; area-code selection when you set up your number; a prompt showing which city a recipient’s area code belongs to as you type; live chat with a person inside the app, which no other fax app offered; 4.8 stars from over 370,000 App Store ratings.
Limitations: Paid subscription with no free tier; no scheduled sending; no Apple Watch app.
2. Genius Fax — best for Genius Scan users
Genius Scan is one of the best-rated scanning apps on the App Store, at 4.9 stars from more than 450,000 people, and Genius Fax sends what you capture in it. If Scan is already installed, this is a natural addition.
If it isn’t, the arrangement is clumsy. Genius Fax has no scanner of its own, so every paper document means opening one app, capturing, switching, and sending from the other. Merging documents also has to happen in Scan.
Strengths: Excellent scanning through its sibling fax app; clean, well-designed interface; credits don’t expire; strong support operation behind it.
Limitations: Requires two apps; can’t merge documents in the fax app; thin cover-page options; per-page credits plus a separate subscription to receive; app-switching crashed on the older iPhone SE; its own rating is 3.4, well below Genius Scan’s.
3. Fax.Plus — best for scheduled sending
The most capable fax app on this list. Scheduled sends, in-app document signing, cloud storage, and cover sheets you can genuinely customise. Its edge detection was the sharpest we tested — no scan needed manual correction.
Strengths: Schedule faxes for a later time; signing built in; best-in-test scanner; a small allowance of free pages to try it.
Limitations: Pages are capped; tier structure takes real effort to compare; some expected features sit on higher plans.
4. iFax — best customer support
Live chat, proper onboarding, and quick answers from people who know the product. It rates 4.5 on the App Store and the fax app polish is real.
The marketing is relentless. Pop-ups, gated features, and enough upgrade emails that one of us blocked the sender.
Strengths: Best support of the seven; polished, feature-rich interface; strong security credentials.
Limitations: Constant upselling below the top tier; receiving costs considerably more than sending; email-to-fax locked to the highest plan.
5. eFax — best for large files
The category incumbent. Transmission quality is excellent and it handles large attachments better than anything else here.
Both the fax app and the web portal feel like products in maintenance rather than development, and the price reflects the brand more than the experience.
Strengths: Outstanding transmission quality; best large-file handling; long enterprise track record.
Limitations: Dated interface; expensive; some protections only on higher plans.
6. FaxBurner — best free option
The only genuinely useful free tier on the fax App Store: five pages to send, and twenty-five received pages every month, ongoing, without paying. For someone waiting on a single form, that may be all they need.
Strengths: Real free receiving allowance; cheap paid plans; simple to set up.
Limitations: Free number is temporary, lasting a day at a time; weak image quality, with most shading lost on our test page; not suitable for sensitive documents.
7. MyFax — cheapest fax number
The budget option from eFax’s family, and the least expensive route to owning a number outright. The fax app is basic and its user ratings are the weakest on this list by a clear margin.
Strengths: Cheapest dedicated fax app number; email-to-fax included.
Limitations: Lowest ratings of the seven; minimal features; fax app feels like a web product squeezed onto a phone.
Which iPhone fax app should you choose?
Municorn Fax for most people. It’s the app that treats the iPhone as the whole machine rather than a remote control for a website, and the several hundred thousand ratings behind it suggest people keep it rather than deleting it once the urgent document is sent.
Pick differently in three cases. Genius Scan devotees should add Genius Fax. Anyone who needs a fax to leave at a set hour wants Fax.Plus. And if you only ever need to receive the odd document, FaxBurner’s free tier costs nothing.
Frequently asked Fax App questions
Does the iPhone have a built-in fax app?
No. Apple has never made a fax app and iOS has no built-in fax function. A fax has to travel over the fax network, which no phone can do unaided. A fax app bridges that gap by sending your document over the internet and passing it to the recipient’s machine.
What is the best fax app for iPhone?
Municorn Fax. It produced the cleanest transmissions of the seven fax apps we tested, completes the whole process without leaving the app, doesn’t cap pages, and holds 4.8 stars from over 370,000 App Store ratings.
Is there a free fax app for iPhone?
FaxBurner is the closest to genuinely free, with five pages to send and twenty-five received pages a month at no cost. The free number is temporary and quality is poor. Most other apps offer a free trial of a paid plan instead, which needs cancelling before it renews.
Can you receive faxes on an iPhone?
Yes. Your fax app gives you a number, and anything sent to it arrives as a PDF you can read, save or forward. Nothing prints and no machine is involved.
Do iPhone fax apps work on iPad?
Generally yes — most are universal apps. We tested on an iPad alongside both iPhones and the experience was the same, with the larger screen making document previews easier to check before sending.
Can you fax from an iPhone without installing an app?
Yes, by email-to-fax or a provider’s web version in Safari. Both work. An app is faster when the document is on paper, because it handles the scanning too.
Which iPhone fax app has the best scanner?
Fax.Plus had the sharpest edge detection, and Genius Scan produces the highest-quality captures overall — though Genius Scan is a separate fax app from Genius Fax. Municorn Fax gave the best end result once the document actually transmitted, which is the measure that matters.
