PQ Calc vs Light Meter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PQ Calc
Easily convert luminance levels (nits) to digital values and vice versa using the SMPTE ST 2084 (PQ) electro-optical transfer function. Supports various bit depths and ranges for professional video workflows.
- Bi-directional conversion
- Luminance (nit) to digital level
- Digital level to luminance (nit)
- Supports Full, SMPTE, SDI-Full ranges
- Calculations in float, percent, 8-16bit
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PQ Calc offers a quick and easy way to convert values along the SMPTE ST 2084 (PQ) electro-optical transfer function (EOTF). The app is bi-directional and will convert the luminance level (nit) to the digital level in Full, SMPTE, or SDI-Full range and vice versa. Calculations are available in float, percent, 8bit, 10bit, 12bit, and 16bit. To use, enter a value in either the "Level" field or the "Nits" field and choose your range. The application will then populate the other fields simultaneously-- it's that simple!
Light Meter
This neumorphism-style light meter offers aperture priority, shutter priority, and manual modes. It allows users to adjust shutter speed, aperture, and ISO sensitivity for precise photography.
- Aperture Priority Mode (A)
- Shutter Priority Mode (S)
- Manual Mode
- Adjustable Shutter Speed
- Adjustable Aperture
- Adjustable ISO Sensitivity
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This is a neumorphism-style light meter launched by Tsingland Camera. #Features [Mode] Tsingland Light Meter currently has three modes: aperture priority (A), shutter priority (S), and manual mode. [Button] A: Aperture priority; S: Shutter priority: R: Reset parameters. [Parameters] Speed: shutter speed; Aperture: aperture; ISO: iso sensitivity. For more film shooting techniques and simulation effects, please visit 'Tsingland Camera'. User Agreement: https://tsinglandcamera.wordpress.com/termsofuse/ Privacy Policy: https://tsinglandcamera.wordpress.com/privacypolicy/ Contact us: lvjt@foxmail.com
Screenshots
Verdict
The clearest difference is price: Light Meter at Free against PQ Calc's $4.99. Light Meter also leads on update cadence (every 2 months vs every 22 months). PQ Calc's advantage is iOS requirement (14.2 vs 16.0). On rating, ratings volume, 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
Light Meter is free to download; PQ Calc costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for PQ Calc against 5.0 for Light Meter. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
PQ Calc ships an update every 22 months, Light Meter every 2 months. The most recent releases landed on October 9, 2026 and October 24, 2026 respectively.
| Parameter | PQ Calc | Light Meter |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 1 |
| Update frequency | Every 22 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 14.2 — better | 16.0 |
| Further details — not scored | ||
| Size | 1 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Avical | 景天 吕 |
Customer experience
PQ Calc
Light Meter
In-app purchases
PQ Calc
No in-app purchases
Light Meter
No in-app purchases
