Light Meter vs Libre Light Sensor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Light Meter
This app functions as a precise and user-friendly light meter using your phone's built-in sensors. It measures illuminance, color temperature, PPFD/PAR, DLI, and luminous flux in real-time. It also includes a calculator for various illumination parameters and allows sharing or saving of measurements.
- Real-time illuminance measurement
- Color temperature measurement
- PPFD/PAR and DLI calculation
- Built-in illumination calculator
- Share and save measurements
- No additional equipment needed
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Lux-525 Pro – universal, highly-precise, and easy to use light meter. - Requires no additional equipment, everything you need is already in your phone - Calibrated with professional light meter - Smart algorithm provides unsurpassed accuracy in all conditions - Real-time measurements of illuminance, color temperature, PPFD/PAR, DLI and luminous flux - Large collection of light sources necessary for accurate calculation of PPFD/PAR and DLI - Built-in calculator for convenient and precise calculation of various illumination parameters (PPFD, DLI, Lux, Fc, Lumens) - Share your measurements via a text message or email or save them to your phone Lux-525 Pro is the best-in-class digital light meter on the phone. It is intended for personal use and may not fully replace industrial-grade light meters. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://n17dev.web.app/light-meter/policy.html
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 review sentiment: Libre Light Sensor at 82% against Light Meter's 33%. Libre Light Sensor also leads on in-app purchases (none vs 4) and update cadence (every 5 weeks vs every 10 months). On price, ratings volume, 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. Light Meter sells 4 in-app purchases, starting at $3.99 per month. Libre Light Sensor asks for nothing beyond the download.
Libre Light Sensor holds the better App Store score, 4.8 against 4.5. Both are backed by a comparable volume of ratings — 116 and 113 respectively. Written reviews point the same way: 33% of Light Meter's written reviews are positive against 82% of Libre Light Sensor's.
Light Meter ships an update every 10 months, Libre Light Sensor every 5 weeks. The most recent releases landed on September 12, 2026 and September 22, 2026 respectively.
| Parameter | Light Meter | Libre Light Sensor |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (116 ratings) | 4.8 (113 ratings) — better |
| Positive reviews | 33.3% of reviews | 82.4% of reviews — better |
| Number of ratings | 116 — better | 113 |
| Update frequency | Every 10 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15.5 — better | 16.0 |
| Further details — not scored | ||
| Size | 17 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Andrey Ivankin | John Harrington |
Customer experience
Light Meter
Libre Light Sensor
In-app purchases
Light Meter
- Premium Monthly Subscription3 Days trial$3.991 Month
- Premium Monthly Subscription3 Days trial$4.991 Month
- Premium Lifetime Subscription$19.99
- Premium Lifetime Subscription$29.99
Libre Light Sensor
No in-app purchases
Questions
Is Light Meter free?
Is Libre Light Sensor free?
Which has better reviews, Light Meter or Libre Light Sensor?
Do Light Meter or Libre Light Sensor have ads?
Which is updated more often, Light Meter or Libre Light Sensor?
Other comparisons
