# NDCalc2 vs ND Filter Calc

The clearest difference is review sentiment: ND Filter Calc at 100% against NDCalc2's 0%. ND Filter Calc also leads on price (Free vs $0.99) and update cadence (every 6 days vs every 10 months). NDCalc2's advantage is iOS requirement (7.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

ND Filter Calc is free to download; NDCalc2 costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

NDCalc2 ships an update every 10 months, ND Filter Calc every 6 days. The most recent releases landed on October 8, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | NDCalc2 | ND Filter Calc |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[1.5 (2 ratings)](https://appshunter.io/ios/app/ndcalc2/id822835884/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 6 days** |
| Monetization | Paid | **Free** |
| Size | 20 MB | 47 MB |
| Requires iOS | **7.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Boris Nienke](https://appshunter.io/developer/300699195) | [Jerry Watson](https://appshunter.io/developer/1647846813) |

## What reviewers say

### NDCalc2

[App page](https://appshunter.io/ios/app/ndcalc2/id822835884)

Calculate correct exposure times when using ND filters for long exposures. Easily manage your filter collection, add custom filters, and switch between single and multi-select modes for stacking.

**Highlights:** Calculate exposure time with ND filters, Supports iPhone 5/s/c screens, Multi-Select Mode for filter stacking, Add custom ND filters, Delete and reorder filters, Countdown timer for long exposures

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

**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 NDCalc2 free?

NDCalc2 costs $0.99, with no in-app purchases.

### Is ND Filter Calc free?

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

### Do NDCalc2 or ND Filter Calc have ads?

Neither NDCalc2 nor ND Filter Calc shows ads.

### Which is updated more often, NDCalc2 or ND Filter Calc?

NDCalc2 ships an update every 10 months, and ND Filter Calc every 6 days. Most recently, NDCalc2 was updated on October 8, 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.*