# Quadratic Formula Calculator vs Drastic Calc

The clearest difference is in-app purchases: Drastic Calc at none against Quadratic Formula Calculator's 1. Drastic Calc also leads on update cadence (weekly vs every 9 months). Quadratic Formula Calculator's advantage is iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.

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

Quadratic Formula Calculator ships an update every 9 months, Drastic Calc weekly. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Quadratic Formula Calculator | Drastic Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (71 ratings)](https://appshunter.io/ios/app/quadratic-formula-calculator/id1425311468/reviews)** | — |
| Number of ratings | **71** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 9 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 3 MB | 15 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Edward Prokopik](https://appshunter.io/developer/1077587110) | [Tatsuro Furuya](https://appshunter.io/developer/1865297357) |

## What reviewers say

### Quadratic Formula Calculator

[App page](https://appshunter.io/ios/app/quadratic-formula-calculator/id1425311468)

This app simplifies solving quadratic equations by allowing users to input coefficients a, b, and c. It quickly displays the solutions for x, including support for imaginary numbers. Users can also switch between light and dark themes for a personalized experience.

**Highlights:** Input coefficients a, b, and c, Displays solutions for x, Supports imaginary number solutions, Light and Dark modes

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Mode | $1.99 | one-time |


### Drastic Calc

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Quadratic Formula Calculator free?

Quadratic Formula Calculator is free to download, with in-app purchases available.

### Is Drastic Calc free?

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

### Do Quadratic Formula Calculator or Drastic Calc have ads?

Both Quadratic Formula Calculator and Drastic Calc show ads.

### Which is updated more often, Quadratic Formula Calculator or Drastic Calc?

Quadratic Formula Calculator ships an update every 9 months, and Drastic Calc weekly. Most recently, Quadratic Formula Calculator was updated on November 6, 2026 and Drastic Calc on October 31, 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.*