# PERI Material Scan vs Simple Unit Converter App

The clearest difference is price: PERI Material Scan at Free against Simple Unit Converter App's $1.99. PERI Material Scan also leads on in-app purchases (none vs 3) and ads (none vs shown). Simple Unit Converter App's advantage is update cadence (every 3 months vs every 9 months). On device support there is nothing between them.

PERI Material Scan is free to download; Simple Unit Converter App costs $1.99 up front. Simple Unit Converter App sells 3 one-off in-app purchases. PERI Material Scan asks for nothing beyond the download.

PERI Material Scan ships an update every 9 months, Simple Unit Converter App every 3 months. The most recent releases landed on September 25, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | PERI Material Scan | Simple Unit Converter App |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/simple-unit-converter-app/id1531584085/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Every 3 months** |
| Monetization | — | Paid |
| Size | 11 MB | 4 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [PERI GmbH](https://appshunter.io/developer/626229088) | [CranialDev.LLC](https://appshunter.io/developer/1445325464) |

## What reviewers say

### PERI Material Scan

[App page](https://appshunter.io/ios/app/peri-material-scan/id1483467539)

**Features:** macOS Compatibility

**In-app purchases:** none


### Simple Unit Converter App

[App page](https://appshunter.io/ios/app/simple-unit-converter-app/id1531584085)

Easily convert between a vast range of measurement units, including acceleration, mass, temperature, and volume. This tool supports numerous categories to help you with everyday conversions and specialized needs.

**Highlights:** Wide array of unit types, Converts acceleration, mass, temperature, volume, and more, Supports numerous categories, User-requested additions, Intuitive interface

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NoAds | $0.99 | one-time |
| Small Tip | $1.99 | one-time |
| Generous Tip | $4.99 | one-time |


## Frequently asked questions

### Is PERI Material Scan free?

PERI Material Scan is free to download, with no in-app purchases.

### Is Simple Unit Converter App free?

Simple Unit Converter App costs $1.99, and also offers in-app purchases.

### Do PERI Material Scan or Simple Unit Converter App have ads?

Simple Unit Converter App shows ads; PERI Material Scan does not.

### Which is updated more often, PERI Material Scan or Simple Unit Converter App?

PERI Material Scan ships an update every 9 months, and Simple Unit Converter App every 3 months. Most recently, PERI Material Scan was updated on September 25, 2026 and Simple Unit Converter App on October 5, 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.*