Libre Light Sensor vs Luminosys
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Libre Light Sensor
Measure ambient light levels in Lux using your iPhone's camera. Optimize sleep quality by understanding light exposure throughout the day and night.
- Measure light in Lux
- Utilizes iPhone camera
- Optimize sleep quality
- Track light exposure
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Measure light levels in any environment. Libre Light Sensor leverages your iPhone's camera to calculate luminosity as measured in Lux. This allows you to determine how much light exposure your eyes are receiving when you wake up, during the day, and before bed in order to optimize your sleep quality.
Luminosys
Accurately measure ambient light levels in Lux or Foot Candles using your phone's camera. This tool is ideal for photography, comparing light sources, or indoor gardening. It's designed for ease of use and provides precise readings.
- Measures light in Lux
- Measures light in Foot Candles (FC)
- Uses phone camera for accuracy
- Easy to use interface
- Suitable for photography
- Useful for indoor gardening
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Luminosys allows you to accurately measure the ambient light level in Lux or Foot Candles (FC). To do this, Luminosys uses your phone's camera in conjunction with a piece of paper to accurately measure the light level. It is very easy to use and is a great app for those looking for accurate light measurements for photography, comparing light sources, or indoor gardening.
Screenshots
Verdict
The clearest difference is ads: Libre Light Sensor at none against Luminosys's shown. Libre Light Sensor also leads on update cadence (every 5 weeks vs every 19 months) and rating (4.8 vs 4.4). On price, review sentiment, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Libre Light Sensor holds the better App Store score, 4.8 against 4.4. That said, the two scores are not equally well evidenced: Libre Light Sensor has 113 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 82% of Libre Light Sensor's written reviews are positive against 75% of Luminosys's.
Libre Light Sensor ships an update every 5 weeks, Luminosys every 19 months. The most recent releases landed on September 28, 2026 and September 20, 2026 respectively.
| Parameter | Libre Light Sensor | Luminosys |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (113 ratings) — better | 4.4 (7 ratings) |
| Positive reviews | 82.4% of reviews — better | 75.0% of reviews |
| Number of ratings | 113 — better | 7 |
| Update frequency | Every 5 weeks — better | Every 19 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone | iPhone |
| Requires iOS | 16.0 | 16.0 |
| Further details — not scored | ||
| Size | 1 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | John Harrington | Melissa Zwick |
Customer experience
Libre Light Sensor
Luminosys
In-app purchases
Libre Light Sensor
No in-app purchases
Luminosys
No in-app purchases
Questions
Is Libre Light Sensor free?
Is Luminosys free?
Which has better reviews, Libre Light Sensor or Luminosys?
Do Libre Light Sensor or Luminosys have ads?
Which is updated more often, Libre Light Sensor or Luminosys?
Other comparisons
