# DataCalc by DPBOX vs First Rush Viewer

The clearest difference is in-app purchases: First Rush Viewer at none against DataCalc by DPBOX's 1. First Rush Viewer also leads on update cadence (every 9 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. DataCalc by DPBOX sells 1 in-app purchase, starting at $2.99 per year. First Rush Viewer asks for nothing beyond the download.

DataCalc by DPBOX ships an update every 2 months, First Rush Viewer every 9 days. The most recent releases landed on September 14, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | DataCalc by DPBOX | First Rush Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 9 days** |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 1 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gavin Foo](https://appshunter.io/developer/556377228) | [진규 한](https://appshunter.io/developer/1895596688) |

## What reviewers say

### DataCalc by DPBOX

[App page](https://appshunter.io/ios/app/datacalc-by-dpbox-video-data/id6503596289)

This tool helps filmmakers calculate video data capacity, transfer times, and recording durations. It offers offline use, iCloud synchronization, and language/unit switching.

**Highlights:** Offline data calculation, Transfer time estimation, Recording duration calculation, Summary of records, iCloud synchronization, Language and unit switching

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual | $2.99 | per year |


### First Rush Viewer

[App page](https://appshunter.io/ios/app/first-rush-viewer/id6765779820)

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

**In-app purchases:** none


## Frequently asked questions

### Is DataCalc by DPBOX free?

DataCalc by DPBOX is free to download, with in-app purchases available.

### Is First Rush Viewer free?

First Rush Viewer is free to download, with no in-app purchases.

### Do DataCalc by DPBOX or First Rush Viewer have ads?

Neither DataCalc by DPBOX nor First Rush Viewer shows ads.

### Which is updated more often, DataCalc by DPBOX or First Rush Viewer?

DataCalc by DPBOX ships an update every 2 months, and First Rush Viewer every 9 days. Most recently, DataCalc by DPBOX was updated on September 14, 2026 and First Rush Viewer on September 13, 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.*