i vs Libre Light Sensor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
i
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i-doThermometer an infrared temperature measurement app connected with mobile phone, which can quickly record temperature information and real-time temperature feedback, so that users can understand the temperature situation more easily.
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.
Screenshots
Verdict
The clearest difference is update cadence: i at fortnightly against Libre Light Sensor's every 5 weeks. i also leads on device support (3 vs 1) and iOS requirement (10.0 vs 16.0). 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.
i ships an update fortnightly, Libre Light Sensor every 5 weeks. The most recent releases landed on May 16, 2026 and September 22, 2026 respectively.
| Parameter | i | Libre Light Sensor |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.8 (113 ratings) — better |
| Positive reviews | — | 82.4% of reviews |
| Number of ratings | — | 113 — better |
| Update frequency | Fortnightly — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 10.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 5 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Robo Electronics co., Ltd. | John Harrington |
In-app purchases
i
No in-app purchases
Libre Light Sensor
No in-app purchases
