# UNITS MASTER vs WriteFlow

The clearest difference is price: WriteFlow at Free against UNITS MASTER's $6.99. WriteFlow also leads on rating (5.0 vs 4.3) and update cadence (every 5 days vs every 4 months). UNITS MASTER's advantage is in-app purchases (none vs 3) and device support (4 vs 2). On ads there is nothing between them.

WriteFlow is free to download; UNITS MASTER costs $6.99 up front. WriteFlow sells 3 in-app purchases, starting at $6.99 per month. UNITS MASTER asks for nothing beyond the download.

WriteFlow holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 6 and 2 respectively.

UNITS MASTER ships an update every 4 months, WriteFlow every 5 days. The most recent releases landed on October 14, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | UNITS MASTER | WriteFlow |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | [4.3 (6 ratings)](https://appshunter.io/ios/app/units-master/id1428926317/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/writeflow-ai-writing-keyboard/id6759579216/reviews)** |
| Number of ratings | **6** | 2 |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 days** |
| Monetization | Paid | **Freemium** |
| Size | 13 MB | 27 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Intemodino Group s.r.o.](https://appshunter.io/developer/557849644) | [Juraj Gajdos](https://appshunter.io/developer/1879621198) |

## What reviewers say

### UNITS MASTER

[App page](https://appshunter.io/ios/app/units-master/id1428926317)

This app is a comprehensive unit conversion calculator for length, distance, and area. It supports a vast array of US and metric units, offering both fractional and decimal calculations with customizable rounding. Users can also perform complex mathematical operations and access a calculation history.

**Highlights:** Extensive US and metric unit support, Fractional and decimal calculations, Customizable rounding precision, Complex calculation capabilities, Calculation history and sharing, Multiple output formats

**Features:** Vision Pro support

**In-app purchases:** none


### WriteFlow

[App page](https://appshunter.io/ios/app/writeflow-ai-writing-keyboard/id6759579216)

Enhance your writing directly within any app. This AI-powered keyboard offers instant grammar correction, text rewriting, translation, and tone adjustment. Improve your messages, emails, and social media posts effortlessly.

**Highlights:** Instant grammar and spelling correction, Text rewriting and paraphrasing, Multilingual translation, Tone adjustment (professional, friendly, etc.), Customizable AI prompts, Works across multiple apps

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WriteFlow AI Keyboard | $6.99 | per month |
| WriteFlow AI Keyboard | $39.99 | per 6 months |
| WriteFlow AI Keyboard | $49.99 | per year |


## Frequently asked questions

### Is UNITS MASTER free?

UNITS MASTER costs $6.99, with no in-app purchases.

### Is WriteFlow free?

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

### Which has better reviews, UNITS MASTER or WriteFlow?

WriteFlow is rated higher. UNITS MASTER averages 4.3 out of 5 from 6 ratings, while WriteFlow averages 5.0 from 2 ratings.

### Do UNITS MASTER or WriteFlow have ads?

Neither UNITS MASTER nor WriteFlow shows ads.

### Which is updated more often, UNITS MASTER or WriteFlow?

UNITS MASTER ships an update every 4 months, and WriteFlow every 5 days. Most recently, UNITS MASTER was updated on October 14, 2026 and WriteFlow on September 30, 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.*