Proton Authenticator vs Constants.Info
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
Constants.Info
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Proton Authenticator | Constants.Info |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (242 ratings) — better | — |
| Positive reviews | 55.9% of reviews | — |
| Number of ratings | 242 — better | — |
| Update frequency | Weekly | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPad |
| Requires iOS | 17.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 119 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Proton AG | TOM 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
Proton Authenticator
No in-app purchases
Constants.Info
No in-app purchases
Questions
Is Proton Authenticator free?
Is Constants.Info free?
Do Proton Authenticator or Constants.Info have ads?
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