# CalcuLight vs Sprokbook

The clearest difference is in-app purchases: Sprokbook at none against CalcuLight's 2. Sprokbook also leads on update cadence (daily vs monthly). CalcuLight's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 18.0). On price and ads there is nothing between them.

Both are free to download. CalcuLight sells 2 in-app purchases, starting at $0.99 per month. Sprokbook asks for nothing beyond the download.

CalcuLight ships an update monthly, Sprokbook daily. The most recent releases landed on September 19, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | CalcuLight | Sprokbook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/calculight/id6758964459/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Daily** |
| Monetization | Freemium | — |
| Size | 40 MB | 16 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Li Fan](https://appshunter.io/developer/1876047115) | [琦琪 徐](https://appshunter.io/developer/1540108126) |

## What reviewers say

### CalcuLight

[App page](https://appshunter.io/ios/app/calculight/id6758964459)

This app provides advanced light metering for film photographers, offering multiple metering modes and exposure control options. It helps users achieve precise exposures for their shots, with features like Zone System display and a log book for tracking. A free version is available, with an optional Pro upgrade for more advanced tools.

**Highlights:** Center Weighted metering, 3D Matrix metering, Spot metering (Pro), Calculated metering (Pro), Shutter Priority metering, Aperture Priority metering (Pro), Zone System overlay (Pro), Log book with GPS (Pro)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CalcuLight | $0.99 | per month |
| CalcuLight | $14.99 | one-time |


### Sprokbook

[App page](https://appshunter.io/ios/app/sprokbook/id6760282935)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CalcuLight free?

CalcuLight is free to download, with in-app purchases available.

### Is Sprokbook free?

Sprokbook is free to download, with no in-app purchases.

### Do CalcuLight or Sprokbook have ads?

Neither CalcuLight nor Sprokbook shows ads.

### Which is updated more often, CalcuLight or Sprokbook?

CalcuLight ships an update monthly, and Sprokbook daily. Most recently, CalcuLight was updated on September 19, 2026 and Sprokbook on September 18, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*