Light Detector vs Zuzanka
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Light Detector
This utility app converts light intensity into sound, allowing users to perceive their surroundings through audio cues. Point your device's camera at any light source to hear variations in pitch based on brightness. It's designed to assist users, particularly those who are blind, in navigating and understanding their environment.
- Converts light to sound
- Adjusts sound pitch by light intensity
- Assists visually impaired users
- Easy to use camera interface
- Portable environmental awareness tool
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Have you ever listened to light? With Light Detector, now you can! Light Detector transforms any natural or artificial light source it encounters into sound. Light Detector is easy to use! Just run the application and point your iPhone camera in any direction. You will hear a higher or lower sound depending on the intensity of the light. If you are blind, Light Detector helps you to be more independent in many daily activities. At home, point your iPhone towards the ceiling to understand where the light fixtures are and whether they are switched on. In a room, move the device along the wall to check if there is a window and where it is. You can find out whether the shades are drawn by moving the device up and down. Bring Light Detector with you to discover what is around you at the speed of light.
Zuzanka
This app scans expiry dates, barcodes, and QR codes on food products. It converts expiry dates to text, offers product information, and supports visually impaired users with features like guiding sounds and voice output. Keep your kitchen organized and your food fresh.
- Expiry date scanning with guiding sounds
- Barcode and QR code scanning
- Product information lookup
- Customizable contrast and voice output
- Export scanned data
- OCR feature for text recognition
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Zuzanka is the world's first expiry date, barcode and QR code scanner. The app quickly locates expiry dates on food products, converts them to text format and allows export to other applications. You can also scan barcodes and QR codes, create custom labels and search for additional information about products. Thanks to our special algorithm you will instantly learn all the information about a product that you hold in your hand. Zuzanka was developed to support the blind and visually impaired people, but it will be useful to anyone who wants to keep their kitchen tidy. Having trouble finding the expiration date on the packaging? Can't see the small font that the date is written in? Do you want to check if the product in your fridge is still edible? Don’t know if you hold cream or jogurt in your hand? Want to learn what’s inside a package that you’ve been keeping on that shelf for months?The Zuzanka app is for you! * Easily find the expiration date on the packaging. The guiding sounds generated by your device will help you with this. If the scanned date indicates that the product is expired, the application will additionally inform you about it. * Wondering where to look for expiration dates? Check out the special section where we share our experience gained by taking several thousand photos of expiration dates. * Do you have doubts whether the app recognized the date correctly? No problem. Share a photo with a friend. You can also zoom and rotate the scanned expiration date photo. * Share the recognized date with e.g. to the Notes or Calendar app. * Turn on the contrast mode and read the expiration date in a synthetic voice. You can also zoom in on the recognized date to make it easier to see. All buttons and fonts meet contrast requirements. You can customize them to your needs. * Want to learn what’s the product you hold in your hand? No problem! The app quickly scans barcodes and QR codes. Thanks to our specially designed, unique algorithm you will get instant information about barcodes on most of the products. * If all fails, you can always the built-in OCR feature. Just shake your phone and it will switch into CR mode. Shake again and you will return to scanning. No need to open other applications, Zuzanka offers everything you need to learn about your food products. * The application is fully compatible with VoiceOver. * Use haptic feedback to know when the scanner has started or detected a date, barcode or QR code without having to listen to sounds. Zuzanka is the fulfillment of a need reported by a blind person with whom we work in the team. The release of the app and any additional features is always preceded by tests with blind and visually impaired users. Do you want to report a problem in the functioning of the app? Have ideas on how to improve it? Feel free to contact us: kontakt@zatoichi.pl. You can use the app for free. To scan expiry dates, barcodes and QR codes, the app offers a free 2-week trial, free one scan once a day, free one-day access once a month for the first few months. The app also offers in-app purchases that give you unlimited access to the expiry date, barcode and QR code scanning feature. You can purchase a lifetime access and pay only once, or you can purchase auto-renewable subscription. Privacy policy: https://zuzanka-terms-of-use.web.app/privacy-policy Terms of Use: https://zuzanka-terms-of-use.web.app/terms-of-use
Screenshots
Verdict
The clearest difference is in-app purchases: Light Detector at none against Zuzanka's 4. Light Detector also leads on ratings volume (8 vs 2) and iOS requirement (7.0 vs 12.0). Zuzanka's advantage is update cadence (fortnightly vs every 12 months) and review sentiment (100% vs 82%). On price, rating, ads and device support 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. Zuzanka sells 4 in-app purchases, starting at $5.00 per month. Light Detector asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.5 for Light Detector against 4.5 for Zuzanka. Both are backed by a comparable volume of ratings — 8 and 2 respectively. Written reviews are what separate them: 82% of Light Detector's written reviews are positive against 100% of Zuzanka's.
Light Detector ships an update every 12 months, Zuzanka fortnightly. The most recent releases landed on October 17, 2026 and October 8, 2026 respectively.
| Parameter | Light Detector | Zuzanka |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (8 ratings) | 4.5 (2 ratings) |
| Positive reviews | 81.6% of reviews | 100.0% of reviews — better |
| Number of ratings | 8 — better | 2 |
| Update frequency | Every 12 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 7.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 1 MB | 159 MB |
| Age rating | 4+ | 4+ |
| Developer | Retina Italia Onlus | Zatoichi Sp. z o.o. |
Customer experience
Light Detector
Zuzanka
In-app purchases
Light Detector
No in-app purchases
Zuzanka
- Product scanning - Monthly1 Month trial$5.001 Month
- Product scanning - 6 mos.6 Months trial$20.006 Months
- Product scanning - Annual1 Year trial$35.001 Year
- Product scanning - Lifetime$79.00








