# Subnet Mask vs DBF Viewer

The clearest difference is ads: DBF Viewer at none against Subnet Mask's shown. DBF Viewer also leads on update cadence (every 6 days vs every 6 months) and device support (4 vs 1). On price and in-app purchases there is nothing between them.

Both are free to download. Subnet Mask sells 1 one-off in-app purchase and DBF Viewer sells 2 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Subnet Mask ships an update every 6 months, DBF Viewer every 6 days. The most recent releases landed on October 14, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Subnet Mask | DBF Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (31 ratings)](https://appshunter.io/ios/app/subnet-mask/id580727679/reviews)** | — |
| Number of ratings | **31** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Every 6 days** |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 23 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Takahiro Furuya](https://appshunter.io/developer/503779747) | [Rush Tools LLC](https://appshunter.io/developer/1896773547) |

## What reviewers say

### Subnet Mask

[App page](https://appshunter.io/ios/app/subnet-mask/id580727679)

This app provides a quick way to calculate subnet masks and host addresses. It features a keypad for CIDR notation and allows for manipulation of keys via swipe gestures, functioning like a slider. It can also be used to determine wildcard masks and the number of addresses.

**Highlights:** Subnet mask calculation, Host address calculation, CIDR notation keypad, Swipe key manipulation, Wildcard mask calculation

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $0.99 | one-time |


### DBF Viewer

[App page](https://appshunter.io/ios/app/dbf-viewer/id6800510170)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Access | $6.99 | per 7 days |
| Annual Access | $69.99 | per year |


## Frequently asked questions

### Is Subnet Mask free?

Subnet Mask is free to download, with in-app purchases available.

### Is DBF Viewer free?

DBF Viewer is free to download, with in-app purchases available.

### Do Subnet Mask or DBF Viewer have ads?

Subnet Mask shows ads; DBF Viewer does not.

### Which is updated more often, Subnet Mask or DBF Viewer?

Subnet Mask ships an update every 6 months, and DBF Viewer every 6 days. Most recently, Subnet Mask was updated on October 14, 2026 and DBF Viewer on October 18, 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.*