# Calc Engine vs Impact!

The clearest difference is update cadence: Calc Engine at daily against Impact!'s fortnightly. Calc Engine also leads on iOS requirement (18 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Calc Engine sells 1 one-off in-app purchase and Impact! sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Calc Engine ships an update daily, Impact! fortnightly. The most recent releases landed on October 28, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Calc Engine | Impact! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/calc-engine/id1061766849/reviews)** | — |
| Number of ratings | **5** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Fortnightly |
| Monetization | Free | — |
| Size | 17 MB | 13 MB |
| Requires iOS | **18** | 26.0 |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 17+ |
| Developer | [VersaEdge Software, LLC](https://appshunter.io/developer/301294952) | [Audun Kjelstrup](https://appshunter.io/developer/989920958) |

## What reviewers say

### Calc Engine

[App page](https://appshunter.io/ios/app/calc-engine/id1061766849)

A highly customizable calculator with advanced features like graphing, equation solving, and unit conversion. Design your own keyboards and functions to streamline your workflow across Apple devices.

**Highlights:** Customizable keyboard layouts, User-defined functions and constants, Live equation graphing, Equation solving, Extensive unit conversions, Programmer mode (hex, binary, octal), Cross-device syncing

**Features:** Family Sharing, Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calc Engine+ | $9.99 | one-time |


### Impact!

[App page](https://appshunter.io/ios/app/impact-ballistic-calculator/id6476831891)

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Impact! Pro | $14.99 | one-time |


## Frequently asked questions

### Is Calc Engine free?

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

### Is Impact! free?

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

### Do Calc Engine or Impact! have ads?

Neither Calc Engine nor Impact! shows ads.

### Which is updated more often, Calc Engine or Impact!?

Calc Engine ships an update daily, and Impact! fortnightly. Most recently, Calc Engine was updated on October 28, 2026 and Impact! on October 21, 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.*