# The Quantified Self vs GrayCat Markdown

The clearest difference is in-app purchases: GrayCat Markdown at none against The Quantified Self's 4. GrayCat Markdown also leads on update cadence (every 5 weeks vs every 7 months). The Quantified Self's advantage is iOS requirement (13.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. The Quantified Self sells 4 in-app purchases, starting at $1.99 per month. GrayCat Markdown asks for nothing beyond the download.

The Quantified Self ships an update every 7 months, GrayCat Markdown every 5 weeks. The most recent releases landed on September 17, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | The Quantified Self | GrayCat Markdown |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 5 weeks** |
| Monetization | Freemium | — |
| Size | 39 MB | 5 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Jared Clifton-Lee](https://appshunter.io/developer/1649451005) | [泳涛 茅](https://appshunter.io/developer/1893812217) |

## What reviewers say

### The Quantified Self

[App page](https://appshunter.io/ios/app/the-quantified-self/id6443804884)

This app helps you manage recurring tasks and habits, prioritizing them by urgency, due date, or importance. It offers automation based on location or NFC tags, performance tracking, and workload adjustment. Organize habits into projects and review your past activities.

**Highlights:** Recurring task management, Habit tracking (good and bad), Automation via location/NFC, Habit organization into projects, Performance tracking over time, Workload adjustment based on bandwidth

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $1.99 | per month |
| Pro Quarterly | $5.49 | per 3 months |
| Pro Biannual | $10.49 | per 6 months |
| Pro Yearly | $20.49 | per year |


### GrayCat Markdown

[App page](https://appshunter.io/ios/app/graycat-markdown/id6762512754)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is The Quantified Self free?

The Quantified Self is free to download, with in-app purchases available.

### Is GrayCat Markdown free?

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

### Do The Quantified Self or GrayCat Markdown have ads?

Neither The Quantified Self nor GrayCat Markdown shows ads.

### Which is updated more often, The Quantified Self or GrayCat Markdown?

The Quantified Self ships an update every 7 months, and GrayCat Markdown every 5 weeks. Most recently, The Quantified Self was updated on September 17, 2026 and GrayCat Markdown on September 9, 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.*