By David Thompson · Published April 9, 2026 · Updated June 8, 2026 · 9 min read
Genius Fax is a pay-as-you-go fax app for iOS and Android built by The Grizzly Labs — the same French company behind the popular Genius Scan document scanner. Unlike most fax services that charge a flat monthly fee, Genius Fax lets you buy credits in advance and use them at your own pace. Credits never expire, which makes the app a natural fit for anyone who faxes occasionally rather than daily.
The app holds a 4.9-star rating on the App Store from over 42,000 reviewers — one of the highest scores in the fax app category. But a strong rating doesn't mean it's the right fit for every user. This review covers exactly what Genius Fax costs, how the sending process works, where it falls short, and which alternatives to consider.
Quick Verdict
Genius Fax excels for occasional, personal faxing with simple documents. Its pay-per-page model and non-expiring credits keep costs low if you fax a few times a year. It is not suitable for healthcare, legal teams, or anyone needing HIPAA compliance — no BAA is offered.
What Is Genius Fax?
Genius Fax is a mobile-first online fax service available on iOS (App Store), Android (Google Play), and the web at geniusfax.com. It was developed by The Grizzly Labs, a Paris-based software studio known for Genius Scan. The app applies the same document image-processing technology — auto-detection, perspective correction, sharpening — to fax transmission.
The core differentiator is its pay-as-you-go pricing model. There is no required monthly subscription for sending faxes. You purchase a block of credits, and each page sent or received consumes one credit. Credits never expire, making this one of the better pay-as-you-go fax options for infrequent users.
Genius Fax supports faxing to 50+ countries at the same per-page rate, with no international surcharges — a genuine advantage over services that charge extra for non-US destinations.
Genius Fax Pricing: Complete Breakdown
Genius Fax charges separately for sending (credits) and receiving (a monthly fax number subscription).
Sending Faxes: Credit Packs
| Credits | Total Cost | Cost Per Page |
|---|---|---|
| 1 credit | $0.99 | $0.99/page |
| ~6 credits | ~$3.99 | ~$0.65/page |
| ~10 credits | ~$4.99 | ~$0.50/page |
| ~50 credits | ~$19.99 | ~$0.40/page |
| 200 credits | $49.99 | $0.25/page |
| 500 credits | ~$94.99 | ~$0.19/page |
Key facts:
- One credit = one fax page (sent or received)
- The cover page is always free — it does not consume a credit
- Credits purchased in the app never expire
- No subscription is required to send faxes
Receiving Faxes: Fax Number Subscription
To receive faxes, you need a dedicated fax number:
- Starts at $3.49/month
- Plus $0.19 per received page
- Local numbers available in 50+ countries
- Unlimited cloud storage for received faxes
Dual Billing Model
Sending and receiving are billed separately. If you need to both send and receive regularly, the combined cost (credits + monthly number) can exceed what flat-rate subscription services charge. Run the math before committing.
No Free Plan
Genius Fax has no free tier. The first page will cost at minimum $0.99. If you need to test the app before paying, you can create an account and explore the interface, but you cannot send a fax without purchasing credits.
How to Send a Fax with Genius Fax
Sending a fax through Genius Fax takes under two minutes once you have credits loaded. Here is the full process:
Create an Account
Sign up at geniusfax.com or directly in the iOS or Android app. You will need an email address and a password. The process takes about 30 seconds.
Purchase Credits
Tap "Buy Credits" and choose a credit pack. If you fax infrequently, start with a small pack — you can always add more later since credits never expire. Payment is processed via the App Store, Google Play, or the web checkout.
Import Your Document
Tap "New Fax" and choose your source. You can import directly from Dropbox, Google Drive, or Box, or open files from iCloud, Mail, Safari, or any other iOS/Android app using the system Share sheet. If you are using Genius Scan, documents transfer directly between the two apps.
Enter the Recipient Number
Type the recipient's fax number including the country code. For US numbers, the format is 1-XXX-XXX-XXXX. Genius Fax supports 50+ destination countries at no extra charge.
Add a Cover Page (Optional)
Add a title and brief message for the cover page — it is always free. Keep in mind that cover page customization options are basic; you cannot design a fully branded cover page within the app.
Send and Confirm
Tap Send. Genius Fax processes the document and transmits it. You will receive a push notification confirming delivery. Your full fax history is saved in the app and synced across all your devices via your account login.
Supported File Formats
Genius Fax accepts PDF and JPEG/image files only. If your document is a Word file, Excel sheet, or any other format, you will need to convert it to PDF first. Use a free tool like our document converter to convert in seconds.
Key Features
Document Import & Scanner Integration
Genius Fax's strongest technical feature is its connection to Genius Scan. If you have both apps installed, you can scan a physical document with Genius Scan — which auto-detects edges, corrects perspective, and sharpens text — then transfer it directly to Genius Fax for sending. This removes the need to handle file conversion yourself.
Cloud storage integration covers Dropbox, Google Drive, and Box. Notably absent is OneDrive, which matters for Windows and Microsoft 365 users.
International Faxing
Genius Fax routes to 50+ countries at the same per-page rate with no destination surcharges. This is a genuine advantage for users who fax internationally, since many competitors add a premium for non-US numbers. See our complete guide to international faxing for country-specific dialing formats.
Privacy and Security
The Grizzly Labs positions Genius Fax as privacy-conscious: no in-app usage tracking, Touch ID authentication, and two-factor authentication support. The app is GDPR compliant (European headquarters). However, as confirmed by their own help documentation, Genius Fax is not HIPAA compliant and does not offer a Business Associate Agreement.
Delivery Notifications and Fax History
Push notifications confirm when a fax is sent and when one is received. Your complete fax history — all sent and received transmissions — is stored in the app and synced across devices. Received faxes arrive as PDFs and can be opened in any compatible app on your device.
Genius Fax Review: Pros and Cons
Genius Fax is a polished, reliable fax app that earns its 4.9-star rating through simplicity and consistency. For occasional personal faxing — tax forms, contracts, medical releases — it is genuinely one of the easiest options available. The pay-per-page model with non-expiring credits is the standout feature.
The significant limitation is the narrow feature set. No HIPAA compliance, no email-to-fax, no multi-document faxing, and PDF/JPEG-only support mean it cannot replace a full-featured fax service for business users.
Pros
- 4.9/5 App Store rating from 42,000+ reviews
- Pay-as-you-go — no monthly fee for sending
- Credits never expire
- Simple, clean interface — minimal learning curve
- International faxing to 50+ countries at flat rate
- Strong privacy posture, no usage tracking
- Pairs naturally with Genius Scan for document capture
- Available on iOS, Android, and web
Cons
- No HIPAA compliance — no BAA offered
- PDF and JPEG only — no Word, Excel, TIFF
- No email-to-fax feature
- No scheduled sending
- Cannot send multiple documents in one fax
- Dual billing (credits + number subscription) can add up
- Email-only customer support — no live chat
- Basic cover page with limited customization
Who Should Use Genius Fax?
Good fit:
- Individuals who fax occasionally (a few times per year)
- Users who already use Genius Scan and want a seamless fax companion
- Anyone faxing internationally who wants flat per-page pricing
- Privacy-conscious users who prefer apps without usage tracking
Not a good fit:
- Healthcare providers — no HIPAA compliance, no BAA
- Legal or insurance teams — limited document format support, no integrations
- Small businesses needing team accounts or a shared inbox
- Users with Word, Excel, or TIFF documents
- Anyone who faxes frequently — a flat-rate subscription becomes cheaper
For a broader comparison of mobile fax apps, see our guide to the best iPhone fax apps and best Android fax apps.
Genius Fax Alternatives
If Genius Fax doesn't fit your needs — or if you want to compare before committing — here are the four strongest alternatives:
| Service | Best For | Starting Price | Free Tier | HIPAA |
|---|---|---|---|---|
| mFax.to | Mobile-first, any user | From $9/mo | No | Yes (Business) |
| Fax.Plus | Regular senders, teams | Free (10 pages) / $6.99/mo | Yes | Enterprise only |
| eFax | Enterprise, compliance | From $15.79/mo | No | Yes |
| iFax | Mobile + HIPAA | From $8.33/mo | No | Yes |
mFax — Best Overall Alternative
mFax.to is a mobile-first fax app with over 5 million users and a 4.8-star App Store rating. Unlike Genius Fax, mFax supports a wider range of file formats, offers HIPAA-ready business plans starting at about $9/mo (billed annually), and has a dedicated fax number included. mFax Business is fully customizable — you build your own plan with a live calculator, choosing the exact seats and pages you need and paying only for what you use, instead of being boxed into rigid fixed tiers. For healthcare, legal, or insurance users, mFax Business is the clear upgrade path.
For personal faxing, mFax competes directly with Genius Fax on simplicity: open the app, upload a document, enter the fax number, send. Delivery confirmation is included.
Fax.Plus — Best Free Option
Fax.Plus offers a permanent free tier with 10 total pages — the only major fax app with a no-cost entry point. Paid plans start at $6.99/month for 200 pages per month. HIPAA compliance is available on the Enterprise plan only ($79.99/month). It's a strong option if you want to try online faxing without spending money first.
eFax — Best for Enterprise
eFax targets businesses and enterprise users. Plans start at ~$15.79/month and include HIPAA compliance, 24/7 phone and chat support, and integrations with business software. It's more expensive than Genius Fax or mFax for casual use, but the support tier justifies the premium for organizations with compliance requirements.
iFax — Best for HIPAA on Mobile
iFax combines a mobile-first interface with full HIPAA compliance across all paid plans, starting at $8.33/month. It includes 24/7 customer support — a notable edge over Genius Fax's email-only support. Good choice for healthcare practices that need a phone-based faxing workflow with compliance built in.
Switching from Genius Fax
If you decide to switch, mFax.to covers everything Genius Fax does — and adds HIPAA support, wider format compatibility, and 24/7 delivery tracking. Trusted by 5 million users with a 4.8-star rating.
Is Genius Fax Worth It in 2026?
Genius Fax is worth it if your use case fits its design: occasional personal faxing with a clean interface and no subscription commitment. The 4.9-star rating reflects genuine quality — the app is simple, fast, and reliable for basic document transmission.
It is not worth it if you need HIPAA compliance, handle documents in formats other than PDF or JPEG, or fax often enough that a flat-rate subscription would be cheaper. At $0.99 per page for one-off sends, costs escalate quickly for anyone faxing more than a dozen pages per month.
For users who hit those limits, mFax.to is the strongest alternative: same mobile simplicity, broader format support, HIPAA-ready business plans, and a larger established user base. Download it from the App Store or visit mFax.to to send your first fax in under two minutes — no fax machine required.