# ND Filter Calc vs NDReady

The clearest difference is in-app purchases: ND Filter Calc at none against NDReady's 2. ND Filter Calc also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, update cadence and ads there is nothing between them.

Both are free to download. NDReady sells 2 in-app purchases, starting at $4.99 per month. ND Filter Calc asks for nothing beyond the download.

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

## The numbers

| Metric | ND Filter Calc | NDReady |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 2 weeks |
| Monetization | Free | — |
| Size | 47 MB | 16 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jerry Watson](https://appshunter.io/developer/1647846813) | [Noah Biggley](https://appshunter.io/developer/6783436142) |

## 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


### NDReady

[App page](https://appshunter.io/ios/app/ndready-nd-filter-calculator/id6783436140)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $4.99 | per month |
| Pro Annual | $29.99 | per year |


## Frequently asked questions

### Is ND Filter Calc free?

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

### Is NDReady free?

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

### Do ND Filter Calc or NDReady have ads?

Neither ND Filter Calc nor NDReady shows ads.

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

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