# Neutral Density Calculator vs NDReady

The clearest difference is price: NDReady at Free against Neutral Density Calculator's $1.99. NDReady also leads on update cadence (every 2 weeks vs every 48 months). Neutral Density Calculator's advantage is in-app purchases (none vs 2) and device support (3 vs 1). On ads there is nothing between them.

NDReady is free to download; Neutral Density Calculator costs $1.99 up front. NDReady sells 2 in-app purchases, starting at $4.99 per month. Neutral Density Calculator asks for nothing beyond the download.

Neutral Density Calculator ships an update every 48 months, NDReady every 2 weeks. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Neutral Density Calculator | NDReady |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[3.4 (5 ratings)](https://appshunter.io/ios/app/neutral-density-calculator/id1343590260/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 48 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 1 MB | 16 MB |
| Requires iOS | **13** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Noah Biggley](https://appshunter.io/developer/6783436142) |

## What reviewers say

### Neutral Density Calculator

[App page](https://appshunter.io/ios/app/neutral-density-calculator/id1343590260)

This utility app assists photographers in determining the correct shutter speed when using neutral density filters. Input your filter's stops and base shutter speed to instantly get the adjusted exposure time, with an optional countdown timer for long exposures.

**Highlights:** ND filter stop input, Base shutter speed input, Calculated shutter speed output, Countdown timer for long exposures, Screen dimming during timer, Sound notification for timer completion, Supports up to 20-stop ND filters

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

**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 Neutral Density Calculator free?

Neutral Density Calculator costs $1.99, with no in-app purchases.

### Is NDReady free?

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

### Do Neutral Density Calculator or NDReady have ads?

Neither Neutral Density Calculator nor NDReady shows ads.

### Which is updated more often, Neutral Density Calculator or NDReady?

Neutral Density Calculator ships an update every 48 months, and NDReady every 2 weeks. Most recently, Neutral Density Calculator was updated on November 2, 2026 and NDReady on October 31, 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.*