# ND+Timer vs ND Filter Calc

The clearest difference is review sentiment: ND Filter Calc at 100% against ND+Timer's 60%. ND Filter Calc also leads on in-app purchases (none vs 1) and update cadence (every 6 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ND+Timer sells 1 one-off in-app purchase. ND Filter Calc asks for nothing beyond the download.

ND+Timer ships an update every 2 months, ND Filter Calc every 6 days. The most recent releases landed on September 20, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | ND+Timer | ND Filter Calc |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 60.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 9 MB | 47 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tobias Ullerich](https://appshunter.io/developer/1475365559) | [Jerry Watson](https://appshunter.io/developer/1647846813) |

## What reviewers say

### ND+Timer

[App page](https://appshunter.io/ios/app/nd-plus-timer/id1534477340)

This app helps photographers determine correct exposure times for long exposure shots using ND filters. It includes a timer to capture the perfect moment and offers pro features through in-app purchases for enhanced functionality.

**Highlights:** Exposure time calculation with ND filters, Integrated timer for capturing moments, Notifications while device is locked, Dark mode (Pro feature), Lock screen widget with running timer (Pro feature), Dynamic Island support (Pro feature), Automatic exposure computation for multiple filters (Pro feature)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ND+Timer Pro | $1.99 | one-time |


### 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 ND+Timer free?

ND+Timer is free to download, with in-app purchases available.

### Is ND Filter Calc free?

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

### Do ND+Timer or ND Filter Calc have ads?

Neither ND+Timer nor ND Filter Calc shows ads.

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

ND+Timer ships an update every 2 months, and ND Filter Calc every 6 days. Most recently, ND+Timer was updated on September 20, 2026 and ND Filter Calc on June 1, 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.*