# Drastic Calc vs CalcBoard

The clearest difference is in-app purchases: Drastic Calc at none against CalcBoard's 1. Drastic Calc also leads on update cadence (weekly vs every 3 months). CalcBoard's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. CalcBoard sells 1 one-off in-app purchase. Drastic Calc asks for nothing beyond the download.

Drastic Calc ships an update weekly, CalcBoard every 3 months. Both last shipped on October 28, 2026.

## The numbers

| Metric | Drastic Calc | CalcBoard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/calcboard-multi-calculator/id6759535339/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 3 months |
| Monetization | — | Free with in-app purchases |
| Size | 15 MB | 50 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Tatsuro Furuya](https://appshunter.io/developer/1865297357) | [Colby Clark](https://appshunter.io/developer/1110053823) |

## What reviewers say

### Drastic Calc

[App page](https://appshunter.io/ios/app/drastic-calc/id6757259289)

**Features:** macOS Compatibility

**In-app purchases:** none


### CalcBoard

[App page](https://appshunter.io/ios/app/calcboard-multi-calculator/id6759535339)

Perform multiple calculations simultaneously on one screen, compare prices side-by-side, and access various modes like scientific and programmer. This ad-free utility offers precise results and stores your data locally.

**Highlights:** Multiple independent calculator panels, Side-by-side price comparison, Scientific, programmer, and unit converter modes, Visible expression history, Shared value tray for chaining calculations, Named variables for complex formulas, Ad-free and no tracking

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CalcBoard Premium | $2.99 | one-time |


## Frequently asked questions

### Is Drastic Calc free?

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

### Is CalcBoard free?

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

### Do Drastic Calc or CalcBoard have ads?

Drastic Calc shows ads; CalcBoard does not.

### Which is updated more often, Drastic Calc or CalcBoard?

Drastic Calc ships an update weekly, and CalcBoard every 3 months. Most recently, Drastic Calc was updated on October 28, 2026 and CalcBoard 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.*