# PrimeThink vs WriteFlow

The clearest difference is in-app purchases: PrimeThink at none against WriteFlow's 3. PrimeThink also leads on iOS requirement (15.0 vs 18.0). WriteFlow's advantage is update cadence (every 5 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. WriteFlow sells 3 in-app purchases, starting at $6.99 per month. PrimeThink asks for nothing beyond the download.

PrimeThink ships an update every 3 weeks, WriteFlow every 5 days. The most recent releases landed on October 13, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | PrimeThink | WriteFlow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/writeflow-ai-writing-keyboard/id6759579216/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | — | Freemium |
| Size | 67 MB | 27 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Novaware Ltd](https://appshunter.io/developer/1502285848) | [Juraj Gajdos](https://appshunter.io/developer/1879621198) |

## What reviewers say

### PrimeThink

[App page](https://appshunter.io/ios/app/primethink/id6744278915)

**Features:** macOS Compatibility, 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 PrimeThink free?

PrimeThink is free to download, with no in-app purchases.

### Is WriteFlow free?

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

### Do PrimeThink or WriteFlow have ads?

Neither PrimeThink nor WriteFlow shows ads.

### Which is updated more often, PrimeThink or WriteFlow?

PrimeThink ships an update every 3 weeks, and WriteFlow every 5 days. Most recently, PrimeThink was updated on October 13, 2026 and WriteFlow on October 16, 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.*