# Delta vs Caffeine Curve

The clearest difference is in-app purchases: Caffeine Curve at none against Delta's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Delta sells 1 one-off in-app purchase. Caffeine Curve asks for nothing beyond the download.

Delta ships an update every 11 days, Caffeine Curve fortnightly. The most recent releases landed on October 11, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Delta | Caffeine Curve |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/caffeine-curve/id6760567892/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 11 days** | Fortnightly |
| Monetization | — | Free |
| Size | 17 MB | 4 MB |
| Requires iOS | 17.0 | **16.6** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Marcel Timm](https://appshunter.io/developer/1846068948) | [Haris Delalic](https://appshunter.io/developer/1885039771) |

## What reviewers say

### Delta

[App page](https://appshunter.io/ios/app/delta-tdee-tracker/id6753978074)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Delta Unlimited | $2.99 | one-time |


### Caffeine Curve

[App page](https://appshunter.io/ios/app/caffeine-curve/id6760567892)

This app estimates your current caffeine level in real-time by analyzing dietary caffeine entries from Apple Health. It helps you understand how caffeine affects your body throughout the day, aiding decisions about intake and sleep. The interface is designed for quick, clear information.

**Highlights:** Real-time caffeine level tracking, Caffeine absorption and elimination model, Apple Health integration, Lock Screen widget and Home Screen Widgets, Peak and sleep indicators, Personalized sensitivity profiles, Demo mode for exploration

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Delta free?

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

### Is Caffeine Curve free?

Caffeine Curve is free to download, with no in-app purchases.

### Do Delta or Caffeine Curve have ads?

Neither Delta nor Caffeine Curve shows ads.

### Which is updated more often, Delta or Caffeine Curve?

Delta ships an update every 11 days, and Caffeine Curve fortnightly. Most recently, Delta was updated on October 11, 2026 and Caffeine Curve on October 10, 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.*