Comparison

Proton Authenticator & 2FA vs NumberLink Client

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Proton Authenticator & 2FA

Securely manage your two-factor authentication codes with an open-source, end-to-end encrypted authenticator app. It offers seamless cross-device syncing, effortless import from other apps, and robust backup options, all protected by strict Swiss privacy laws. Take control of your digital security with a trusted and private solution.

Highlights
  • End-to-end encrypted iCloud sync
  • Effortless import from other authenticators
  • Secure backup and export
  • Swiss privacy by design
  • Open source and transparent
  • Offline support
Features
Read full description

Get the authenticator trusted by millions — from Proton Mail, the world's largest encrypted email provider. Proton Authenticator is open source, end-to-end encrypted, and protected by strict Swiss privacy laws. Protect all your new accounts and strengthen security on your existing ones. Proton Authenticator keeps your 2FA codes secure, accessible, and completely private — with full control over where your data is stored. KEY FEATURES Local-First Storage:Your 2FA codes are stored entirely on your device, giving you complete control over your data. Effortless Import: Migrate from Google Authenticator, Authy, or any other app in seconds. Secure Backup & Export: Retain full control of your data with easy backup and restore options. Swiss Privacy by Design: Built under Switzerland's strongest data protection regulations. Open Source & Transparent: Auditable code. No tracking. No ads. Take control of your digital security with encryption you can trust. Free to use: No Proton account required, ad-free. Offline support: On mobile and desktop apps No other 2FA app provides this combination of security and privacy. Trusted by millions. Built by Proton. Take control of your digital security today. Terms of service: https://proton.me/legal/terms Learn more: https://proton.me

About

NumberLink Client

Seamlessly sync contacts, call logs, and messages across multiple devices using your primary phone number. Send texts from any compatible device and receive notifications for messages and missed calls wherever you are. Ideal for professionals and remote workers needing flexible communication.

Highlights
  • Sync contacts, call log, and messages
  • Send texts from any device
  • Notifications for messages and missed calls
  • Use personal and work numbers on one phone
  • Limit smartphone usage with dumbphone switching
Read full description

NumberLink by Sunbeam Wireless gives you the freedom to use your phone number across multiple devices. NumberLink is a service for Sunbeam phone users and requires a Sunbeam phone and active NumberLink subscription. Learn more about NumberLink on our website at https://numberlink.sunbeamwireless.com/ Features: * Sync your contacts, call log, and messages between multiple devices. * Send text messages from any compatible device. * Get notifications for messages and missed calls on multiple devices. * Use both your personal phone number and your work number on the same phone. * Create healthier habits by limiting your smart phone usage and seamlessly switching to an F1 dumbphone. NumberLink ensures you stay in control of your communication, regardless of where you are or the device you're using, making it a great solution for: • Professionals juggling work and personal phones. • Office workers who want to text from their computer. • On-the-go Service technicians and remote workers. • Anyone who needs flexible access to calls and messages from more than one device. Installation: To use the NumberLink service, you'll need to create an account on your Sunbeam phone and purchase a NumberLink subscription. A NumberLink subscription can be purchased at https://sunbeamwireless.com/subscription-products/ or by calling 660-474-0070 ext. 3 Learn more about NumberLink on our website at https://numberlink.sunbeamwireless.com/

Screenshots

Proton Authenticator & 2FA4 screens
NumberLink Client2 screens

Verdict

The call

The clearest difference is review sentiment: Proton Authenticator & 2FA at 58% against NumberLink Client's 0%. Proton Authenticator & 2FA also leads on rating (4.6 vs 3.7) and monetization model (free vs subscription). NumberLink Client's advantage is iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Proton Authenticator & 2FA holds the better App Store score, 4.6 against 3.7. That said, the two scores are not equally well evidenced: Proton Authenticator & 2FA has 759 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 58% of Proton Authenticator & 2FA's written reviews are positive against 0% of NumberLink Client's.

UpkeepUpdate frequency

Proton Authenticator & 2FA ships an update weekly, NumberLink Client every 3 weeks. The most recent releases landed on November 8, 2026 and October 30, 2026 respectively.

Scorecard6 real differences · 4 level
Proton Authenticator & 2FA versus NumberLink Client: the parameters behind the verdict, then further details
ParameterProton Authenticator & 2FANumberLink Client
PriceFreeFree
Rating4.6 (759 ratings) — better3.7 (3 ratings)
Positive reviews57.6% of reviews — better0.0% of reviews
Number of ratings759 — better3
Update frequencyWeekly — betterEvery 3 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterSubscription
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS17.015.0 — better
Further details — not scored
Size120 MB44 MB
Age rating4+4+
DeveloperProton AGSunbeam Wireless

Customer experience

Proton Authenticator & 2FA

All ratings314 ratings
Positive82.8%
Neutral6.7%
Negative10.5%
Written reviews255 reviews
Positive57.6%
Neutral19.2%
Negative23.1%

NumberLink Client

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

Proton Authenticator & 2FA

Reported bugs

4 issues
  • Sync/login loop on iPad
  • 2FA input broken on non-iPhone devices
  • Screen strobing on iPad
  • Duplicate entries after import

Requested features

5 requests
  • PIN unlock for desktop
  • Alphabetical sorting option
  • Export function (not just Proton-specific backup)
  • Native macOS app
  • Option to hide item icons

NumberLink Client

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Proton Authenticator & 2FA

No in-app purchases

None

NumberLink Client

No in-app purchases

Questions

Is Proton Authenticator & 2FA free?
Proton Authenticator & 2FA is free to download, with no in-app purchases.
Is NumberLink Client free?
NumberLink Client is free to download, with no in-app purchases.
Which has better reviews, Proton Authenticator & 2FA or NumberLink Client?
Proton Authenticator & 2FA is rated higher. Proton Authenticator & 2FA averages 4.6 out of 5 from 759 ratings, while NumberLink Client averages 3.7 from 3 ratings.
Do Proton Authenticator & 2FA or NumberLink Client have ads?
Neither Proton Authenticator & 2FA nor NumberLink Client shows ads.
Which is updated more often, Proton Authenticator & 2FA or NumberLink Client?
Proton Authenticator & 2FA ships an update weekly, and NumberLink Client every 3 weeks. Most recently, Proton Authenticator & 2FA was updated on November 8, 2026 and NumberLink Client on October 30, 2026.

Other comparisons