# Calc Engine vs Smart Calc+

The clearest difference is in-app purchases: Smart Calc+ at none against Calc Engine's 1. Smart Calc+ also leads on iOS requirement (13.4 vs 18). Calc Engine's advantage is update cadence (daily vs every 3 days). On price, ads and device support there is nothing between them.

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

Calc Engine ships an update daily, Smart Calc+ every 3 days. The most recent releases landed on October 5, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Calc Engine | Smart Calc+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/calc-engine/id1061766849/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Every 3 days |
| Monetization | Free | — |
| Size | 17 MB | 22 MB |
| Requires iOS | 18 | **13.4** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [VersaEdge Software, LLC](https://appshunter.io/developer/301294952) | [Rahman Usta](https://appshunter.io/developer/1750311538) |

## 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 |


### Smart Calc+

[App page](https://appshunter.io/ios/app/smart-calc-plus/id6504203262)

**In-app purchases:** none


## Frequently asked questions

### Is Calc Engine free?

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

### Is Smart Calc+ free?

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

### Do Calc Engine or Smart Calc+ have ads?

Neither Calc Engine nor Smart Calc+ shows ads.

### Which is updated more often, Calc Engine or Smart Calc+?

Calc Engine ships an update daily, and Smart Calc+ every 3 days. Most recently, Calc Engine was updated on October 5, 2026 and Smart Calc+ on September 29, 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.*