# Glucose Timer vs Blood Sugar Diary

The clearest difference is in-app purchases: Glucose Timer at none against Blood Sugar Diary's 4. Blood Sugar Diary's advantage is update cadence (every 4 days vs every 2 weeks) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Blood Sugar Diary sells 4 in-app purchases, starting at $7.99 per month. Glucose Timer asks for nothing beyond the download.

Glucose Timer ships an update every 2 weeks, Blood Sugar Diary every 4 days. The most recent releases landed on November 9, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | Glucose Timer | Blood Sugar Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Size | 6 MB | 74 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 12+ |
| Developer | [Weichen Cheng](https://appshunter.io/developer/1193049632) | [Muhammed Bozkurt](https://appshunter.io/developer/1808955530) |

## What reviewers say

### Glucose Timer

[App page](https://appshunter.io/ios/app/glucose-timer/id6755944934)

**Features:** macOS Compatibility

**In-app purchases:** none


### Blood Sugar Diary

[App page](https://appshunter.io/ios/app/blood-sugar-diary-zerospike/id6778782351)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| zerospike Pro Monthly | $7.99 | per month |
| zerospike Pro Annual | $39.99 | per year |
| zerospike Pro Annual | $39.99 | per year |
| zerospike Pro Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is Glucose Timer free?

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

### Is Blood Sugar Diary free?

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

### Do Glucose Timer or Blood Sugar Diary have ads?

Neither Glucose Timer nor Blood Sugar Diary shows ads.

### Which is updated more often, Glucose Timer or Blood Sugar Diary?

Glucose Timer ships an update every 2 weeks, and Blood Sugar Diary every 4 days. Most recently, Glucose Timer was updated on November 9, 2026 and Blood Sugar Diary on November 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.*