How Far Thunder vs Off Lens
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
How Far Thunder
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Do you hear thunder, but do not know where it is? Want to surprise your friends with supernatural abilities? Bet on it that you can predict the exact distance to the place where the thunderstorm occurs. Is your child afraid of thunder and lightning? Reassure her that the thunder is now far away and play an interesting game together - determine the exact distance to the thunder. You can do all this with one touch! Just press the start button when you see lightning, and the App itself will calculate how many miles or kilometers of bad weather is raging.
Off Lens
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OffLens is a fully offline OCR app built on Apple’s VisionKit. Capture or pick photos, draw a precise crop, and recognize text in multiple languages without sending any data to servers. Your images and text stay on your device. Key features: · Offline by design: No uploads, no tracking, no ads. · Precise crop first: Drag corners or edges to target exactly what you need. · Multi-language OCR: Recognize text across many languages; auto-detect supported. · Proofread with highlights: See bounding boxes over the original image to verify accuracy. · Editable results: Review recognized text in a clean editor and copy with one tap. · History on-device: Keep up to 100 entries locally; view, edit, or delete anytime. · Camera and gallery: Snap a photo or import from your library; optional save-back after cropping. · Share and export: Copy lines or full results; share with friends. · Privacy-first: No analytics, no remote processing—everything runs locally. How it works: 1. Choose Photo or Camera, then draw the crop box. 2. OffLens runs VisionKit OCR offline and overlays highlights for quick review. 3. Edit text if needed, then copy or share. Why OffLens: · Great for receipts, documents, slides, whiteboards, books, and multilingual content. · Works anywhere—even without a network. · Fast, accurate recognition powered by VisionKit. Need help? Contact: shungyy8@gmail.com.
Screenshots
Verdict
The clearest difference is device support: How Far Thunder at 3 against Off Lens's 1. How Far Thunder also leads on iOS requirement (14.4 vs 18.0). On price, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | How Far Thunder | Off Lens |
|---|---|---|
| Price | Free | Free |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 14.4 — better | 18.0 |
| Further details — not scored | ||
| Size | 25 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Serhii Rymar | Feiyun Technology Ltd. |
In-app purchases
How Far Thunder
No in-app purchases
Off Lens
No in-app purchases



