# RackDocs vs Master Tempo

The clearest difference is ads: RackDocs at none against Master Tempo's shown. RackDocs also leads on update cadence (every 6 days vs every 3 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. RackDocs sells 4 in-app purchases, starting at $0.99 per month and Master Tempo sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

RackDocs ships an update every 6 days, Master Tempo every 3 months. The most recent releases landed on October 12, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | RackDocs | Master Tempo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/rackdocs-eurorack-reference/id6753894257/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 6 days** | Every 3 months |
| Monetization | Freemium | — |
| Size | 31 MB | 10 MB |
| Requires iOS | **18.0** | 18.5 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [TheMM](https://appshunter.io/developer/312265848) | [Ratshavarin Trinabhametr](https://appshunter.io/developer/1546579848) |

## What reviewers say

### RackDocs

[App page](https://appshunter.io/ios/app/rackdocs-eurorack-reference/id6753894257)

Document your modular synthesizer modules with photos and detailed notes. Capture every switch position, LED behavior, and hidden feature. Sync across devices and access your documentation offline.

**Highlights:** Photo-based module documentation, AI annotation extraction from manuals, Multi-context documentation, LED behavior tracking, Switch position guides, Community library of documented modules, Offline access and iCloud sync

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.99 | per month |
| Yearly Subscription | $3.99 | per year |
| Yearly Supporter | $8.99 | per year |
| Lifetime Access | $44.99 | one-time |


### Master Tempo

[App page](https://appshunter.io/ios/app/master-tempo/id6757002087)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Coffee | $0.29 | one-time |
| Big Coffee | $0.69 | one-time |
| Master Tempo Pro | $5.99 | one-time |


## Frequently asked questions

### Is RackDocs free?

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

### Is Master Tempo free?

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

### Do RackDocs or Master Tempo have ads?

Master Tempo shows ads; RackDocs does not.

### Which is updated more often, RackDocs or Master Tempo?

RackDocs ships an update every 6 days, and Master Tempo every 3 months. Most recently, RackDocs was updated on October 12, 2026 and Master Tempo on October 11, 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.*