# Caffeine Curve vs Steady

The clearest difference is in-app purchases: Caffeine Curve at none against Steady's 2. Caffeine Curve also leads on ratings volume (5 vs 1) and iOS requirement (16.6 vs 18.0). Steady's advantage is device support (3 vs 1). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Steady sells 2 in-app purchases, starting at $3.99 per month. Caffeine Curve asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Caffeine Curve against 5.0 for Steady. That said, the two scores are not equally well evidenced: Caffeine Curve has 5 ratings behind it against 1, so its average is the more settled of the two.

Caffeine Curve ships an update fortnightly, Steady weekly. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Caffeine Curve | Steady |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (5 ratings)](https://appshunter.io/ios/app/caffeine-curve/id6760567892/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/steady-night-shift-sleep/id6768091450/reviews) |
| Number of ratings | **5** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | **Free** | Freemium |
| Size | 4 MB | 14 MB |
| Requires iOS | **16.6** | 18.0 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Haris Delalic](https://appshunter.io/developer/1885039771) | [JC Mobile App Studio LLC](https://appshunter.io/developer/1895553190) |

## What reviewers say

### 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


### Steady

[App page](https://appshunter.io/ios/app/steady-night-shift-sleep/id6768091450)

This app helps shift workers manage fatigue and optimize sleep. It offers a smart wake alarm, fatigue forecasting, and personalized coaching tips. Prioritizing privacy, it keeps all your data on your device.

**Highlights:** Drive home risk alert, Smart wake alarm, 3-day fatigue forecast, Evidence-based coaching tips, Bilingual (English/Spanish), Private, on-device data storage

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Steady Pro, Monthly | $3.99 | per month |
| Steady Pro, Yearly | $24.99 | per year |


## Frequently asked questions

### Is Caffeine Curve free?

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

### Is Steady free?

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

### Which has better reviews, Caffeine Curve or Steady?

Caffeine Curve and Steady are both rated 5.0 out of 5 on the App Store, from 5 and 1 ratings respectively.

### Do Caffeine Curve or Steady have ads?

Neither Caffeine Curve nor Steady shows ads.

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

Caffeine Curve ships an update fortnightly, and Steady weekly. Most recently, Caffeine Curve was updated on October 24, 2026 and Steady on October 28, 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.*