# Compound Calculator vs Pencil Fire

The clearest difference is price: Pencil Fire at Free against Compound Calculator's $0.99. Pencil Fire also leads on in-app purchases (none vs 3). Compound Calculator's advantage is ads (none vs shown) and update cadence (every 5 days vs every 2 weeks). On device support and iOS requirement there is nothing between them.

Pencil Fire is free to download; Compound Calculator costs $0.99 up front. Compound Calculator sells 3 in-app purchases, starting at $2.99 per month. Pencil Fire asks for nothing beyond the download.

Compound Calculator ships an update every 5 days, Pencil Fire every 2 weeks. Both last shipped on October 28, 2026.

## The numbers

| Metric | Compound Calculator | Pencil Fire |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 5 days** | Every 2 weeks |
| Size | 5 MB | 72 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [乐祥 胡](https://appshunter.io/developer/1572365721) | [Dung Phung Van](https://appshunter.io/developer/1839231258) |

## What reviewers say

### Compound Calculator

[App page](https://appshunter.io/ios/app/compound-calculator-lite/id6749442265)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Compound Calculator - Pro 30days | $2.99 | per month |
| Compound Calculator - Pro 360days | $14.99 | per year |
| Compound Calculator Pro - lifetime | $19.99 | one-time |


### Pencil Fire

[App page](https://appshunter.io/ios/app/pencil-fire/id6752404216)

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

**In-app purchases:** none


## Frequently asked questions

### Is Compound Calculator free?

Compound Calculator costs $0.99, and also offers in-app purchases.

### Is Pencil Fire free?

Pencil Fire is free to download, with no in-app purchases.

### Do Compound Calculator or Pencil Fire have ads?

Pencil Fire shows ads; Compound Calculator does not.

### Which is updated more often, Compound Calculator or Pencil Fire?

Compound Calculator ships an update every 5 days, and Pencil Fire every 2 weeks. Most recently, Compound Calculator was updated on October 28, 2026 and Pencil Fire on October 28, 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.*