# Calc Engine vs prismCalc

The clearest difference is update cadence: Calc Engine at daily against prismCalc's weekly. Calc Engine also leads on monetization model (free vs freemium) and iOS requirement (18 vs 26.0). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Calc Engine against 5.0 for prismCalc. Both are backed by a comparable volume of ratings — 4 and 4 respectively.

Calc Engine ships an update daily, prismCalc weekly. The most recent releases landed on October 5, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Calc Engine | prismCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/calc-engine/id1061766849/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/prismcalc/id6756225072/reviews) |
| Number of ratings | 4 | 4 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Weekly |
| Monetization | **Free** | Freemium |
| Size | 17 MB | 70 MB |
| Requires iOS | **18** | 26.0 |
| Devices | iPhone, iPad, Mac, Apple Watch | iPhone, iPad, Mac, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [VersaEdge Software, LLC](https://appshunter.io/developer/301294952) | [Patrick LaClair](https://appshunter.io/developer/1859344139) |

## 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 |


### prismCalc

[App page](https://appshunter.io/ios/app/prismcalc/id6756225072)

This app offers a visually appealing and functional calculator for everyday financial tasks like splitting bills, calculating discounts, and comparing loan payments. It provides live calculation previews, a history of recent results, and various everyday tools.

**Highlights:** Live calculation preview, History of recent results, Tip and split bill calculator, Discount calculator, Loan calculator, Unit converter, Customizable themes

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| prismCalc Pro | $2.99 | one-time |


## Frequently asked questions

### Is Calc Engine free?

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

### Is prismCalc free?

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

### Which has better reviews, Calc Engine or prismCalc?

Calc Engine and prismCalc are both rated 5.0 out of 5 on the App Store, from 4 and 4 ratings respectively.

### Do Calc Engine or prismCalc have ads?

Neither Calc Engine nor prismCalc shows ads.

### Which is updated more often, Calc Engine or prismCalc?

Calc Engine ships an update daily, and prismCalc weekly. Most recently, Calc Engine was updated on October 5, 2026 and prismCalc on October 3, 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.*