Comparison

Proton Authenticator vs Constants.Info

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

Head to head
About

Proton Authenticator

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

Constants.Info

Features
Read full description

Find, Compare, and Share Material Data Easily Constants.Info is designed for quick and convenient access to material properties. Whether you're an engineer, student, or hobbyist, this app lets you look up, compare, and contribute material data - all in one place. Key Features: Quick Material Lookup Search for any material and instantly view its properties, chemical formula, and more. Our database combines community submissions with moderated values for a comprehensive resource. Compare Properties Easily compare specific properties across different materials. Whether you're analyzing boiling points, electrical conductivities, or other characteristics, Constants.Info helps you find the data you need. Contribute to the Community Submit new property values and help expand the database. Your contributions make Constants.Info a valuable resource for everyone. Moderated for Quality Submissions are reviewed on a best-effort basis to maintain data quality. While we strive for accuracy, we encourage users to verify critical information independently. Ideal for Professionals and Enthusiasts: Perfect for engineers, researchers, students, and anyone interested in material science.

Screenshots

Proton Authenticator4 screens
Constants.Info4 screens

Verdict

The call

Proton Authenticator and Constants.Info are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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.

ScorecardNo meaningful differences
Proton Authenticator versus Constants.Info: the parameters behind the verdict, then further details
ParameterProton AuthenticatorConstants.Info
PriceFreeFree
Rating4.4 (242 ratings) — better—
Positive reviews55.9% of reviews—
Number of ratings242 — better—
Update frequencyWeekly—
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS17.0 — better18.6
Further details — not scored
Size119 MB14 MB
Age rating4+4+
DeveloperProton AGTOM RICHARD REINHARDT

Bugs and requests

Proton Authenticator

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

Constants.Info

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Proton Authenticator

No in-app purchases

None

Constants.Info

No in-app purchases

Questions

Is Proton Authenticator free?
Proton Authenticator is free to download, with no in-app purchases.
Is Constants.Info free?
Constants.Info is free to download, with no in-app purchases.
Do Proton Authenticator or Constants.Info have ads?
Neither Proton Authenticator nor Constants.Info shows ads.

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