# ND Filter Calc vs Sun & Moon Position

The clearest difference is in-app purchases: ND Filter Calc at none against Sun & Moon Position's 3. ND Filter Calc also leads on iOS requirement (15.0 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Sun & Moon Position sells 3 in-app purchases, starting at $0.99 per month. ND Filter Calc asks for nothing beyond the download.

ND Filter Calc ships an update every 6 days, Sun & Moon Position weekly. The most recent releases landed on November 3, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | ND Filter Calc | Sun & Moon Position |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Weekly |
| Monetization | Free | — |
| Size | 47 MB | 13 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jerry Watson](https://appshunter.io/developer/1647846813) | [ryo muranaka](https://appshunter.io/developer/1606480078) |

## What reviewers say

### ND Filter Calc

[App page](https://appshunter.io/ios/app/nd-filter-calc/id6449380764)

This tool helps photographers calculate neutral density filter effects on their camera's exposure. It includes a countdown timer for long exposures, simplifying the process of achieving desired results.

**Highlights:** Neutral density filter calculation, Exposure compensation, Long exposure timer, Countdown for shutter speeds > 3 seconds, Simple interface

**In-app purchases:** none


### Sun & Moon Position

[App page](https://appshunter.io/ios/app/sun-and-moon-position/id6815093115)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $0.99 | per month |
| Pro Yearly | $9.99 | per year |
| Pro Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is ND Filter Calc free?

ND Filter Calc is free to download, with no in-app purchases.

### Is Sun & Moon Position free?

Sun & Moon Position is free to download, with in-app purchases available.

### Do ND Filter Calc or Sun & Moon Position have ads?

Neither ND Filter Calc nor Sun & Moon Position shows ads.

### Which is updated more often, ND Filter Calc or Sun & Moon Position?

ND Filter Calc ships an update every 6 days, and Sun & Moon Position weekly. Most recently, ND Filter Calc was updated on November 3, 2026 and Sun & Moon Position on November 11, 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.*