# Octodecuple Calc vs Umbra Browser

The clearest difference is in-app purchases: Octodecuple Calc at none against Umbra Browser's 3. Octodecuple Calc also leads on update cadence (every 2 weeks vs every 2 months) and device support (3 vs 1). Umbra Browser's advantage is ads (none vs shown). On price there is nothing between them.

Both are free to download. Umbra Browser sells 3 in-app purchases, starting at $3.99 per month. Octodecuple Calc asks for nothing beyond the download.

Octodecuple Calc ships an update every 2 weeks, Umbra Browser every 2 months. The most recent releases landed on September 23, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Octodecuple Calc | Umbra Browser |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Size | 36 MB | 3 MB |
| Requires iOS | **15.8.3** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [Kevin Stewart](https://appshunter.io/developer/1840294398) |

## What reviewers say

### Octodecuple Calc

[App page](https://appshunter.io/ios/app/octodecuple-calc/id6742386286)

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

**In-app purchases:** none


### Umbra Browser

[App page](https://appshunter.io/ios/app/umbra-browser/id6761460876)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Eclipse Monthly | $3.99 | per month |
| Eclipse Yearly | $29.99 | per year |
| Eclipse Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is Octodecuple Calc free?

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

### Is Umbra Browser free?

Umbra Browser is free to download, with in-app purchases available.

### Do Octodecuple Calc or Umbra Browser have ads?

Octodecuple Calc shows ads; Umbra Browser does not.

### Which is updated more often, Octodecuple Calc or Umbra Browser?

Octodecuple Calc ships an update every 2 weeks, and Umbra Browser every 2 months. Most recently, Octodecuple Calc was updated on September 23, 2026 and Umbra Browser on September 14, 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.*