Chronos Authenticator vs SlideCrop
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Chronos Authenticator
This open-source app provides secure two-factor authentication using time-based and counter-based methods. It offers end-to-end encryption for token data and optional iCloud backup and sync for convenience. Easily import and export your authentication tokens.
- Open-source
- End-to-end encrypted token storage
- Optional iCloud backup and sync
- Token export and import
- Anonymous usage (no account required)
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Chronos is an open-source two-factor authentication (2FA) app designed to deliver robust security and reliable backup features. It supports both time-based (TOTP) and counter-based (HOTP) authentication methods. Features: • Open-source • End-to-end encrypted: Only encrypted token data is stored on the device and in iCloud • Backup & Sync (optional): Effortlessly backup and sync your data with iCloud • Export Tokens: Easily export your tokens for backup or transfer • Import Tokens: Easily import your tokens from other authenticators • Anonymous: No telemetry & app account required
SlideCrop
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Crooked slide photos, fixed instantly. Snap a photo of a projector screen or slide, and SlideCrop finds it, straightens it and cleans it up — automatically, on your iPhone or iPad. • Batch: straighten a whole lecture in one go • PDF: turn a talk into one named PDF, up to 8 slides per page • Precise: adjust corners with a magnifier and Smart Snap • Compare each cleaned slide with your original photo • Save as new photos, or replace the originals (reversible) Private by design: everything is processed on your device. No account, no ads. Try it free, including one PDF export. A one-time purchase unlocks unlimited saves and PDFs — no subscription. Available in English, Chinese, Japanese, Korean, Thai, Spanish, French and German.
Screenshots
Verdict
The clearest difference is in-app purchases: Chronos Authenticator at none against SlideCrop's 1. Chronos Authenticator also leads on update cadence (every 6 days vs every 2 weeks). On price, ads, device support and iOS requirement 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
Both are free to download. SlideCrop sells 1 one-off in-app purchase. Chronos Authenticator asks for nothing beyond the download.
Chronos Authenticator ships an update every 6 days, SlideCrop every 2 weeks. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.
| Parameter | Chronos Authenticator | SlideCrop |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 6 days — better | Every 2 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 11 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Joel-David Wong | Sira Rojanasakul |
In-app purchases
Chronos Authenticator
No in-app purchases
SlideCrop
- SlideCrop Unlimited$4.99
Questions
Is Chronos Authenticator free?
Is SlideCrop free?
Do Chronos Authenticator or SlideCrop have ads?
Which is updated more often, Chronos Authenticator or SlideCrop?
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