# DevStack Tools vs hYYa ink

The clearest difference is in-app purchases: DevStack Tools at none against hYYa ink's 1. DevStack Tools also leads on iOS requirement (13.0 vs 17.0). hYYa ink's advantage is update cadence (every 3 days vs every 6 weeks). On price, ads and device support there is nothing between them.

Both are free to download. hYYa ink sells 1 one-off in-app purchase. DevStack Tools asks for nothing beyond the download.

DevStack Tools ships an update every 6 weeks, hYYa ink every 3 days. The most recent releases landed on October 8, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | DevStack Tools | hYYa ink |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hyya-ink-pdf-and-markdown/id6786209046/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 days** |
| Monetization | — | Freemium |
| Size | 29 MB | 16 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPad, iPod, Mac | iPhone, iPad, Mac, Vision Pro |
| Age rating | 4+ | 4+ |
| Developer | [Man Sao Ng](https://appshunter.io/developer/1590351701) | [Hassaan Abdeen](https://appshunter.io/developer/1866789892) |

## What reviewers say

### DevStack Tools

[App page](https://appshunter.io/ios/app/devstack-tools/id6773667344)

**Features:** Vision Pro support

**In-app purchases:** none


### hYYa ink

[App page](https://appshunter.io/ios/app/hyya-ink-pdf-and-markdown/id6786209046)

This app transforms raw text files like Markdown, JSON, and CSV into readable, editable documents. It also offers robust PDF management, including editing, signing, and making scanned documents searchable. AI integration allows for summarization and reformatting of text-based files.

**Highlights:** Live Markdown rendering with formatting toolbar, Editable JSON, YAML, TOML trees, Interactive CSV/TSV tables, Offline diagram generation (Mermaid, Graphviz), Beautifully typeset LaTeX math, PDF editing, signing, and search, On-device AI actions for text manipulation

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| hYYa ink Pro | $19.99 | one-time |


## Frequently asked questions

### Is DevStack Tools free?

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

### Is hYYa ink free?

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

### Do DevStack Tools or hYYa ink have ads?

Neither DevStack Tools nor hYYa ink shows ads.

### Which is updated more often, DevStack Tools or hYYa ink?

DevStack Tools ships an update every 6 weeks, and hYYa ink every 3 days. Most recently, DevStack Tools was updated on October 8, 2026 and hYYa ink on October 19, 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.*