# DiaMeter vs Baby Diary

The clearest difference is ads: DiaMeter at none against Baby Diary's shown. DiaMeter also leads on iOS requirement (11.0 vs 17.0). Baby Diary's advantage is update cadence (every 3 days vs monthly) and review sentiment (62% vs 38%). On price, rating, in-app purchases and monetization model there is nothing between them.

Both are free to download. DiaMeter sells 3 in-app purchases, starting at $4.49 per month and Baby Diary sells 6 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Baby Diary holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Baby Diary has 146 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 38% of DiaMeter's written reviews are positive against 62% of Baby Diary's.

DiaMeter ships an update monthly, Baby Diary every 3 days. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | DiaMeter | Baby Diary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (8 ratings)](https://appshunter.io/ios/app/diameter/id1196947268/reviews) | **[4.8 (146 ratings)](https://appshunter.io/ios/app/baby-diary-sleep-plus/id1402586391/reviews)** |
| Number of ratings | 8 | **146** |
| Positive reviews | 38.1% of reviews | **62.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 3 days** |
| Monetization | Freemium | Free with in-app purchases |
| Size | 69 MB | 94 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MeteorIT](https://appshunter.io/developer/1156077103) | [Pavel Goncharov](https://appshunter.io/developer/1052509933) |

## What reviewers say

### DiaMeter

[App page](https://appshunter.io/ios/app/diameter/id1196947268)

This app helps manage diabetes by tracking blood sugar, insulin doses, and carbohydrate intake. It provides clear statistics and reminders to help users achieve better control over their condition. Features include a bread unit calculator and educational articles.

**Highlights:** Diabetes diary with all records, Quick data entry, Bread unit calculator, Insulin dose calculation, Statistics for sugar, insulin, and food, Data export to table, Cloud synchronization, Automatic reminders

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Месячная подписка | $4.49 | per month |
| Годовая подписка (промо) | $36.99 | per year |
| Полный доступ (годовая подписка) | $37.99 | per year |


### Baby Diary

[App page](https://appshunter.io/ios/app/baby-diary-sleep-plus/id1402586391)

This app helps new parents track and improve their baby's sleep patterns. It allows logging sleep sessions, calculating wakefulness, and provides insights based on sleep standards. Additional features include event tracking, statistical analysis, and reminders for bedtime.

**Highlights:** Log baby's sleep sessions, Calculate wakefulness intervals, Sleep standard compliance hints, Track daily baby events, Statistical data analysis, Create bedtime reminders, Export data to Excel

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One month | $0.99 | per month |
| One month: Statistics + Widget | $1.99 | per month |
| A small cup of coffee | $1.99 | one-time |
| Medium cup of coffee | $2.99 | one-time |
| A large cup of coffee | $4.99 | one-time |
| Full version | $34.99 | one-time |


## Frequently asked questions

### Is DiaMeter free?

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

### Is Baby Diary free?

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

### Which has better reviews, DiaMeter or Baby Diary?

Baby Diary is rated higher. DiaMeter averages 4.6 out of 5 from 8 ratings, while Baby Diary averages 4.8 from 146 ratings.

### Do DiaMeter or Baby Diary have ads?

Baby Diary shows ads; DiaMeter does not.

### Which is updated more often, DiaMeter or Baby Diary?

DiaMeter ships an update monthly, and Baby Diary every 3 days. Most recently, DiaMeter was updated on November 2, 2026 and Baby Diary on November 3, 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.*