# CleanMD vs Thought Spark

The clearest difference is in-app purchases: CleanMD at none against Thought Spark's 2. CleanMD also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Thought Spark sells 2 in-app purchases, starting at $7.99 per month. CleanMD asks for nothing beyond the download.

CleanMD ships an update monthly, Thought Spark every 4 weeks. Both last shipped on October 25, 2026.

## The numbers

| Metric | CleanMD | Thought Spark |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/thought-spark-idea-capture/id6785658186/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 weeks** |
| Monetization | — | Freemium |
| Size | 36 MB | 2 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [袁凯 张](https://appshunter.io/developer/1887716815) | [Edventure Design LLC](https://appshunter.io/developer/6785658188) |

## What reviewers say

### CleanMD

[App page](https://appshunter.io/ios/app/cleanmd-pdf-to-markdown/id6776694920)

**Features:** macOS Compatibility

**In-app purchases:** none


### Thought Spark

[App page](https://appshunter.io/ios/app/thought-spark-idea-capture/id6785658186)

Capture fleeting thoughts instantly through voice or text, then use AI to refine them with targeted questions. Research your ideas by scanning the web for context and prior art. Turn concepts into actionable tasks, reminders, and calendar events.

**Highlights:** Instant voice and text capture, AI-guided idea refinement, Web-based idea research, Actionable task generation, Cross-platform synchronization, Automatic transcription and titling

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Thought Spark Pro (Monthly) | $7.99 | per month |
| Thought Spark Pro (Yearly) | $49.99 | per year |


## Frequently asked questions

### Is CleanMD free?

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

### Is Thought Spark free?

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

### Do CleanMD or Thought Spark have ads?

Neither CleanMD nor Thought Spark shows ads.

### Which is updated more often, CleanMD or Thought Spark?

CleanMD ships an update monthly, and Thought Spark every 4 weeks. Most recently, CleanMD was updated on October 25, 2026 and Thought Spark on October 25, 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.*