SOSglasses vs CritiCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SOSglasses
This app helps you read small text without your glasses. It uses augmented reality to enhance text readability in low light and bright sunlight, and offers zoom and photo capture features.
- Augmented reality for low light reading
- Text enhancement in bright sunlight
- Smooth zoom up to 15x
- Photo capture for documentation
- Invert text mode
- Strain-free Sepia mode
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BEST READING GLASSES app for iPhones, starting from iPhone 4S to the latest iPhones X,XS,XR and XS Max. NO ADVERTS forced and all basic functions totally FREE. Also the ONLY APP (as far as we know) that ENHANCES text readability - not just magnifies it, supports READING AT CANDLELIGHT WITHOUT TORCH AND - unlocks all features at very bright sunlight - because we just love sunshine :) Forgotten your reading glasses again? SOSglasses comes to the rescue! Read menus, bills, maps or important labelling information without your reading glasses! With its best in class augmented reality mode (AR), it even lets you read in candle light - for example the menu at a romantic dinner - without using the all embarrassing torch. - Other features include: - Smooth Zoom up to factor 15 in high resolution (pinch) -FREE - AR mode to read without torch in dim lighting (slider) - Photo capture for documentation -FREE - Clean, easy to use interface (e.g. tap anywhere on screen to focus, pinch to zoom) -FREE - Invert text mode if you prefer - Shift main controls to left if you prefer (just tilt right instead of left into landscape mode)-FREE - Strain-free Sepia mode (may be more comfortable for some of our readers, for example with Visual Stress Syndrome) - AR mode reduces the noise, enhances the text and still feels natural to the eyes From iPhone 4S to the latest model. For all recent iOS versions. Share pictures, ideas or just make us smile by telling us you like it. Get in touch now: www.sosglasses.eu
CritiCalc
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Simple tool for calculating a variety of transport medicine problems. This is not a tool for self-diagnosis and is meant to aid medical professionals that have been trained in these tools. Please seek medical help from a doctor as these tools in isolation are insufficient to provide medical advice. If you are a medical provider, please cross reference local policies, protocols, and training. No guarantee is provided to the accuracy of these tools.
Screenshots
Verdict
The clearest difference is in-app purchases: CritiCalc at none against SOSglasses's 1. CritiCalc also leads on update cadence (every 2 weeks vs every 2 months) and device support (4 vs 2). SOSglasses's advantage is iOS requirement (11.0 vs 15.6). On price and ads 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. SOSglasses sells 1 one-off in-app purchase. CritiCalc asks for nothing beyond the download.
SOSglasses ships an update every 2 months, CritiCalc every 2 weeks. The most recent releases landed on June 11, 2026 and September 13, 2026 respectively.
| Parameter | SOSglasses | CritiCalc |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 11.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 22 MB | 53 MB |
| Age rating | 4+ | 17+ |
| Developer | WPTRNPT LTD. | Jason Richmond |
In-app purchases
SOSglasses
- 4 -almost- Magical Features$0.99
CritiCalc
No in-app purchases









