# Zen Slate vs Thread Mark

The clearest difference is ads: Zen Slate at none against Thread Mark's shown. Thread Mark's advantage is iOS requirement (13.0 vs 17.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Zen Slate sells 2 in-app purchases, starting at $19.99 per year and Thread Mark sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Zen Slate ships an update every 10 days, Thread Mark fortnightly. The most recent releases landed on September 24, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Zen Slate | Thread Mark |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 10 days** | Fortnightly |
| Size | 16 MB | 49 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ZenProducts Technologies Pvt. Ltd.](https://appshunter.io/developer/1849997461) | [Koya Kurauchi](https://appshunter.io/developer/1887146796) |

## What reviewers say

### Zen Slate

[App page](https://appshunter.io/ios/app/zen-slate-notes-and-to-dos/id6754855420)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zen Slate Pro Annual | $19.99 | per year |
| Zen Slate, bought once | $49.99 | one-time |


### Thread Mark

[App page](https://appshunter.io/ios/app/thread-mark-markdown-notes/id6775019899)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy the Developer a Coffee | $2.99 | one-time |
| ThreadMark Pro | $9.99 | one-time |


## Frequently asked questions

### Is Zen Slate free?

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

### Is Thread Mark free?

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

### Do Zen Slate or Thread Mark have ads?

Thread Mark shows ads; Zen Slate does not.

### Which is updated more often, Zen Slate or Thread Mark?

Zen Slate ships an update every 10 days, and Thread Mark fortnightly. Most recently, Zen Slate was updated on September 24, 2026 and Thread Mark on September 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.*