{
    "products": [
        {
            "slug": "proton-authenticator",
            "name": "Proton Authenticator",
            "kind": "app",
            "website": "https://proton.me/authenticator",
            "page": "https://listme.name/software/proton-authenticator",
            "tagline": "Open-source two-factor app with end-to-end encrypted sync",
            "summary": "Proton Authenticator is a two-factor authentication app from Proton, the company behind Proton Mail. It runs on iPhone, iPad, Apple Watch, Android, macOS, Windows and Linux, and it syncs and backs up codes with end-to-end encryption.",
            "developer": "Proton",
            "platforms": [
                "ios",
                "android",
                "macos",
                "windows",
                "linux"
            ],
            "pricing": "free",
            "price_note": "Free to use and ad-free, according to its site",
            "free_to_use": true,
            "open_source": true,
            "strengths": [
                "Free to use, with sync and backup of codes",
                "Apps for phones, tablets, Apple Watch and desktops",
                "Standalone app, with no password manager needed"
            ],
            "limits": [
                "No browser extension is listed on the product page"
            ],
            "checked": "2026-10-10",
            "connected_to_publisher": false,
            "overview": "Proton Authenticator generates one-time codes on phones, tablets, Apple Watch and desktops. The app supports biometric unlock, and you can search for codes and see the next code for an account. Codes sync and back up across devices, and the site describes the app as end-to-end encrypted.\n\nProton describes the app as open source, free to use and ad-free, and it says the company is Swiss-based. It is a standalone product, although the site also promotes Proton Pass for storing passwords alongside codes. No browser extension is listed on the product page."
        },
        {
            "slug": "stratum",
            "name": "Stratum",
            "kind": "app",
            "website": "https://stratumauth.com/",
            "page": "https://listme.name/software/stratum",
            "tagline": "Open-source Android authenticator with encrypted backups",
            "summary": "Stratum is a free and open-source two-factor authentication app for Android, formerly called Authenticator Pro. It offers encrypted backups and export, and it has a Wear OS companion app.",
            "platforms": [
                "android"
            ],
            "pricing": "open-source",
            "price_note": "Free and open source under GPL-3.0 for Android",
            "free_to_use": true,
            "open_source": true,
            "license": "GPL-3.0",
            "source": "https://github.com/stratumauth/app",
            "strengths": [
                "GPL-3.0 licensed, with source on GitHub",
                "Encrypted backups and export at any time"
            ],
            "limits": [
                "Android only, with no iOS or desktop version",
                "Backup files are yours to store safely"
            ],
            "checked": "2026-10-10",
            "connected_to_publisher": false,
            "overview": "Stratum is a community-run project that publishes its Android app under the GNU GPL v3 license. The site says the project has no corporate ties, that the source is on GitHub for anyone to audit, and that the app does not communicate with distant servers.\n\nThe app offers encrypted backup and restore, icons and categories, and a range of customisation options. It runs on Android only. The site also mentions a Wear OS app for viewing codes from a watch, which needs a connection to the phone, so Stratum suits Android users who want control over their own backup files."
        }
    ],
    "differences": [
        "Only Proton Authenticator runs on Windows.",
        "Only Proton Authenticator runs on macOS.",
        "Only Proton Authenticator runs on Linux.",
        "Only Proton Authenticator runs on iOS.",
        "Proton Authenticator: free. Stratum: free and open source."
    ],
    "shared_rankings": [
        {
            "list": "authenticator-apps",
            "name": "Authenticator apps",
            "page": "https://listme.name/best/authenticator-apps",
            "of": 10,
            "results": [
                {
                    "product": "proton-authenticator",
                    "rank": 2,
                    "score": 89,
                    "verdict": "Open-source app with end-to-end encrypted sync and backup across phones, tablets and desktops, plus an Apple Watch app. No browser extension is listed, and the company is Swiss-based.",
                    "best_for": "Encrypted sync across phones, tablets and desktops",
                    "spec": {
                        "platforms": "iOS, Android, macOS, Windows, Linux",
                        "open_source": true,
                        "backups": "End-to-end encrypted sync and backup"
                    }
                },
                {
                    "product": "stratum",
                    "rank": 6,
                    "score": 85,
                    "verdict": "Android-only and open source under GPL-3.0, with encrypted backups and export you control. It has no iOS or desktop version, so it suits Android users who want local backup files over cloud sync.",
                    "best_for": "Android users who want encrypted local backups",
                    "spec": {
                        "platforms": "Android",
                        "open_source": true,
                        "backups": "Encrypted backup and restore; export at any time"
                    }
                }
            ]
        }
    ],
    "ranks_higher_in_closest_shared_list": "proton-authenticator",
    "page": "https://listme.name/compare/proton-authenticator-vs-stratum",
    "json": "https://listme.name/api/v1/compare/proton-authenticator-vs-stratum.json",
    "notes": [
        "Scores are editorial and only comparable inside one list. Products with connected_to_publisher true receive a disclosed ranking lift: https://listme.name/methodology"
    ],
    "source": "https://listme.name",
    "license": "Free to read and cite with attribution to listme.name.",
    "docs": "https://listme.name/developers"
}