# Perfect Exposure vs ND Filter Calc

The clearest difference is update cadence: ND Filter Calc at every 6 days against Perfect Exposure's every 2 months. Perfect Exposure's advantage is iOS requirement (10.0 vs 15.0). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Perfect Exposure ships an update every 2 months, ND Filter Calc every 6 days. The most recent releases landed on October 24, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Perfect Exposure | ND Filter Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (7 ratings)](https://appshunter.io/ios/app/perfect-exposure/id1388698298/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 days** |
| Monetization | Free | Free |
| Size | 17 MB | 47 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Haoyuan Xia](https://appshunter.io/developer/1044926382) | [Jerry Watson](https://appshunter.io/developer/1647846813) |

## What reviewers say

### Perfect Exposure

[App page](https://appshunter.io/ios/app/perfect-exposure/id1388698298)

This app assists photographers in calculating camera settings for various scenarios, including exposure time, time-lapse durations, and optimal settings for capturing sharp stars or star trails. It also helps determine depth of field and hyperfocal distance.

**Highlights:** Exposure time calculation, Time-lapse planning, Sharp star exposure limits, Star trail calculation, Depth of field calculation, Hyperfocal distance

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Perfect Exposure free?

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

### Is ND Filter Calc free?

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

### Do Perfect Exposure or ND Filter Calc have ads?

Neither Perfect Exposure nor ND Filter Calc shows ads.

### Which is updated more often, Perfect Exposure or ND Filter Calc?

Perfect Exposure ships an update every 2 months, and ND Filter Calc every 6 days. Most recently, Perfect Exposure was updated on October 24, 2026 and ND Filter Calc on September 30, 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.*