# ND Filter Calc vs Silverlog ND

The clearest difference is in-app purchases: ND Filter Calc at none against Silverlog ND's 5. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Silverlog ND sells 5 one-off in-app purchases. ND Filter Calc asks for nothing beyond the download.

ND Filter Calc ships an update every 6 days, Silverlog ND every 5 days. The most recent releases landed on September 30, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | ND Filter Calc | Silverlog ND |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 days | **Every 5 days** |
| Monetization | Free | — |
| Size | 47 MB | 40 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jerry Watson](https://appshunter.io/developer/1647846813) | [Simon Westgate](https://appshunter.io/developer/1856537803) |

## 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


### Silverlog ND

[App page](https://appshunter.io/ios/app/silverlog-nd/id6759198139)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Nice One | $0.99 | one-time |
| Legend | $2.99 | one-time |
| Absolute Hero | $4.99 | one-time |
| Guardian Angel | $9.99 | one-time |
| Actual Saint | $29.99 | one-time |


## Frequently asked questions

### Is ND Filter Calc free?

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

### Is Silverlog ND free?

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

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

Neither ND Filter Calc nor Silverlog ND shows ads.

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

ND Filter Calc ships an update every 6 days, and Silverlog ND every 5 days. Most recently, ND Filter Calc was updated on September 30, 2026 and Silverlog ND on October 11, 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.*