# Carbohydrate Log vs SignalButton

The clearest difference is ads: SignalButton at none against Carbohydrate Log's shown. Carbohydrate Log's advantage is iOS requirement (13.0 vs 15.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Carbohydrate Log sells 3 in-app purchases, starting at $0.99 per month and SignalButton sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

Carbohydrate Log ships an update every 10 days, SignalButton every 2 weeks. The most recent releases landed on September 28, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Carbohydrate Log | SignalButton |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 10 days** | Every 2 weeks |
| Size | 51 MB | 89 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [NAOYA ONO](https://appshunter.io/developer/1530328146) | [ANIMAL HEALTH PUBLICATIONS, L.L.C.](https://appshunter.io/developer/1689862838) |

## What reviewers say

### Carbohydrate Log

[App page](https://appshunter.io/ios/app/carbohydrate-log/id6470109699)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan | $0.99 | per month |
| Support Developer | $0.99 | one-time |
| Remove ads | $24.99 | one-time |


### SignalButton

[App page](https://appshunter.io/ios/app/signalbutton/id6760325356)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SignalButton Monthly Access | $5.99 | per month |
| SignalButton Yearly Access | $59.99 | per year |


## Frequently asked questions

### Is Carbohydrate Log free?

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

### Is SignalButton free?

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

### Do Carbohydrate Log or SignalButton have ads?

Carbohydrate Log shows ads; SignalButton does not.

### Which is updated more often, Carbohydrate Log or SignalButton?

Carbohydrate Log ships an update every 10 days, and SignalButton every 2 weeks. Most recently, Carbohydrate Log was updated on September 28, 2026 and SignalButton on October 9, 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.*