# Plain vs Hoban HDPM

The clearest difference is in-app purchases: Hoban HDPM at none against Plain's 3. Hoban HDPM also leads on update cadence (every 4 days vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Plain sells 3 in-app purchases, starting at $4.99 per 7 days. Hoban HDPM asks for nothing beyond the download.

Plain ships an update every 4 months, Hoban HDPM every 4 days. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Plain | Hoban HDPM |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 26 MB | 131 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MOBIVERSITE YAZILIM BILISIM REKLAM VE DANISMANLIK HIZMETLERI SANAYI TICARET LIMITED STI](https://appshunter.io/developer/968440561) | [齁斑科技社會企業有限公司](https://appshunter.io/developer/1725140118) |

## What reviewers say

### Plain

[App page](https://appshunter.io/ios/app/plain-ai-keyboard/id6467874401)

This advanced AI-powered keyboard acts as your personal text assistant, offering features like grammar correction, translation, and tone adjustment. It helps you write, communicate, and generate text more effectively across all your applications.

**Highlights:** Grammar and spell check, Seamless translation, AI-powered answers, Tone adjustment, Text paraphrasing, Response generation, Text continuation, Synonym finder

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Week PRO | $4.99 | per 7 days |
| 1 Month PRO | $9.99 | per month |
| 1 Year PRO | $39.99 | per year |


### Hoban HDPM

[App page](https://appshunter.io/ios/app/hoban-hdpm/id6499187575)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Plain free?

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

### Is Hoban HDPM free?

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

### Do Plain or Hoban HDPM have ads?

Neither Plain nor Hoban HDPM shows ads.

### Which is updated more often, Plain or Hoban HDPM?

Plain ships an update every 4 months, and Hoban HDPM every 4 days. Most recently, Plain was updated on November 3, 2026 and Hoban HDPM on October 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.*