# Sun Map Clock vs Light Ruler

The clearest difference is device support: Sun Map Clock at 3 against Light Ruler's 1. Sun Map Clock also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Sun Map Clock sells 2 in-app purchases, starting at $15.00 per month and Light Ruler sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Sun Map Clock ships an update fortnightly, Light Ruler weekly. The most recent releases landed on October 14, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Sun Map Clock | Light Ruler |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 74 MB | 1 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [QAEE CONPUUTENG](https://appshunter.io/developer/1853582855) | [小倩 徐](https://appshunter.io/developer/6771586178) |

## What reviewers say

### Sun Map Clock

[App page](https://appshunter.io/ios/app/sun-map-clock-shadow-tracker/id6765796926)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $15.00 | per month |
| Yearly Subscription | $150.00 | per year |


### Light Ruler

[App page](https://appshunter.io/ios/app/light-ruler-photo-toolkit/id6779471175)

This photography calculator helps plan shots for landscape, long exposure, and night sky photography. It calculates shutter speed with ND filters, depth of field, and night sky exposure limits. All data is stored locally on your device.

**Highlights:** ND filter long exposure calculation, Equivalent exposure adjustments, Depth of field and hyperfocal distance, Night sky shutter speed limits, Angle of view and focal length comparison, Local data storage

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Pro Unlock | $3.99 | one-time |


## Frequently asked questions

### Is Sun Map Clock free?

Sun Map Clock is free to download, with in-app purchases available.

### Is Light Ruler free?

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

### Do Sun Map Clock or Light Ruler have ads?

Neither Sun Map Clock nor Light Ruler shows ads.

### Which is updated more often, Sun Map Clock or Light Ruler?

Sun Map Clock ships an update fortnightly, and Light Ruler weekly. Most recently, Sun Map Clock was updated on October 14, 2026 and Light Ruler on September 29, 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.*