# Lactate Express vs DocumentDiary

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

Both are free to download. Lactate Express sells 4 in-app purchases, starting at $24.99 per month and DocumentDiary sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

Lactate Express ships an update every 3 weeks, DocumentDiary every 3 months. The most recent releases landed on October 12, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Lactate Express | DocumentDiary |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 37.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Size | 133 MB | 15 MB |
| Requires iOS | 17.5 | **17.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [COPAtec GmbH](https://appshunter.io/developer/890381257) | [JULIUS RUDORFER](https://appshunter.io/developer/1863969016) |

## What reviewers say

### Lactate Express

[App page](https://appshunter.io/ios/app/lactate-express/id1671640113)

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Teams (Monthly) | $24.99 | per month |
| Professionals (1 Month) | $44.99 | per month |
| Teams (Yearly) | $250.00 | per year |
| Professionals (Yearly) | $399.00 | per year |


### DocumentDiary

[App page](https://appshunter.io/ios/app/documentdiary/id6756974469)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DocumentDiary Premium · Monthly | $5.99 | per month |
| DocumentDiary Premium | $22.99 | per 6 months |


## Frequently asked questions

### Is Lactate Express free?

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

### Is DocumentDiary free?

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

### Do Lactate Express or DocumentDiary have ads?

DocumentDiary shows ads; Lactate Express does not.

### Which is updated more often, Lactate Express or DocumentDiary?

Lactate Express ships an update every 3 weeks, and DocumentDiary every 3 months. Most recently, Lactate Express was updated on October 12, 2026 and DocumentDiary on September 29, 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.*