# Rollei Action one vs ND Filter Calc

The clearest difference is review sentiment: ND Filter Calc at 100% against Rollei Action one's 50%. ND Filter Calc also leads on update cadence (every 6 days vs every 8 months). Rollei Action one's advantage is iOS requirement (9.0 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Rollei Action one ships an update every 8 months, ND Filter Calc every 6 days. Both last shipped on November 3, 2026.

## The numbers

| Metric | Rollei Action one | ND Filter Calc |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 6 days** |
| Monetization | Free | Free |
| Size | 209 MB | 47 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Rollei GmbH & Co. KG](https://appshunter.io/developer/658176679) | [Jerry Watson](https://appshunter.io/developer/1647846813) |

## What reviewers say

### Rollei Action one

[App page](https://appshunter.io/ios/app/rollei-action-one/id1609581031)

Control your action camera remotely with this app. Review, download, edit, and share photos and videos directly from your phone without needing a computer. Supports various shooting modes like time-lapse and slow motion.

**Highlights:** Remote camera operation via WiFi, Image and video review, Direct download to phone, In-app editing, Time-lapse and slow motion modes, Continuous shooting, Loop recording

**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 Rollei Action one free?

Rollei Action one is free to download, with no in-app purchases.

### Is ND Filter Calc free?

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

### Do Rollei Action one or ND Filter Calc have ads?

Neither Rollei Action one nor ND Filter Calc shows ads.

### Which is updated more often, Rollei Action one or ND Filter Calc?

Rollei Action one ships an update every 8 months, and ND Filter Calc every 6 days. Most recently, Rollei Action one was updated on November 3, 2026 and ND Filter Calc on November 3, 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.*