# 100 Days Tracker vs Caffeine Level Tracker & Calc

The clearest difference is in-app purchases: Caffeine Level Tracker & Calc at none against 100 Days Tracker's 1. Caffeine Level Tracker & Calc also leads on iOS requirement (15.0 vs 17.6). 100 Days Tracker's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. 100 Days Tracker sells 1 one-off in-app purchase. Caffeine Level Tracker & Calc asks for nothing beyond the download.

100 Days Tracker ships an update every 6 weeks, Caffeine Level Tracker & Calc every 2 months. The most recent releases landed on October 10, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | 100 Days Tracker | Caffeine Level Tracker & Calc |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free | — |
| Size | 11 MB | 45 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Chad Goodyear](https://appshunter.io/developer/1448496611) | [Seulki Eom](https://appshunter.io/developer/1718927408) |

## What reviewers say

### 100 Days Tracker

[App page](https://appshunter.io/ios/app/100-days-tracker/id6470750665)

This app helps you build lasting habits by tracking your daily progress on up to 100-day challenges. Customize your goals with themes and layouts, and share your achievements. Widgets offer at-a-glance progress updates.

**Highlights:** Track multiple 100-day challenges, Home screen widgets for progress, Customizable color themes, Grid and overview layouts, Share progress snapshots

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Lifetime | $6.99 | one-time |


### Caffeine Level Tracker & Calc

[App page](https://appshunter.io/ios/app/caffeine-level-tracker-and-calc/id6778823481)

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

**In-app purchases:** none


## Frequently asked questions

### Is 100 Days Tracker free?

100 Days Tracker is free to download, with in-app purchases available.

### Is Caffeine Level Tracker & Calc free?

Caffeine Level Tracker & Calc is free to download, with no in-app purchases.

### Do 100 Days Tracker or Caffeine Level Tracker & Calc have ads?

Caffeine Level Tracker & Calc shows ads; 100 Days Tracker does not.

### Which is updated more often, 100 Days Tracker or Caffeine Level Tracker & Calc?

100 Days Tracker ships an update every 6 weeks, and Caffeine Level Tracker & Calc every 2 months. Most recently, 100 Days Tracker was updated on October 10, 2026 and Caffeine Level Tracker & Calc on October 13, 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.*