# 100 Days After vs ONE Habit Tracker

The clearest difference is rating: ONE Habit Tracker at 5.0 against 100 Days After's 4.2. ONE Habit Tracker also leads on update cadence (every 2 months vs every 4 months). 100 Days After's advantage is in-app purchases (none vs 3) and ratings volume (6 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. ONE Habit Tracker sells 3 in-app purchases, starting at $3.99 per month. 100 Days After asks for nothing beyond the download.

ONE Habit Tracker holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: 100 Days After has 6 ratings behind it against 1, so its average is the more settled of the two.

100 Days After ships an update every 4 months, ONE Habit Tracker every 2 months. The most recent releases landed on October 23, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | 100 Days After | ONE Habit Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (6 ratings)](https://appshunter.io/ios/app/100-days-after/id444664249/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/one-habit-tracker-progress/id6748330634/reviews)** |
| Number of ratings | **6** | 1 |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | **Free** | Freemium |
| Size | 9 MB | 18 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Broong, Inc.](https://appshunter.io/developer/324853708) | [Jeff Cedilla](https://appshunter.io/developer/944615129) |

## What reviewers say

### 100 Days After

[App page](https://appshunter.io/ios/app/100-days-after/id444664249)

Calculate the 100th day from any given date or celebrate anniversaries. Export calculated dates as events to your iPhone's calendar.

**Highlights:** Calculate 100th day from any date, Celebrate anniversaries, Export dates as calendar events, New user interface, New features

**Features:** Vision Pro support

**In-app purchases:** none


### ONE Habit Tracker

[App page](https://appshunter.io/ios/app/one-habit-tracker-progress/id6748330634)

This app helps you build lasting habits by focusing on mastering one at a time. It uses psychology-backed commitment periods, intelligent insights, and streak risk prediction to prevent failure and celebrate your wins.

**Highlights:** Master one habit at a time, Commitment-based system (30, 60, 90 days), Streak risk prediction, Mood tracking for trigger identification, Visual streak counters and milestone celebrations, Weekly analytics and progress reports, Distraction-free interface with dark mode

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $3.99 | per month |
| Yearly | $6.99 | per year |
| Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is 100 Days After free?

100 Days After is free to download, with no in-app purchases.

### Is ONE Habit Tracker free?

ONE Habit Tracker is free to download, with in-app purchases available.

### Which has better reviews, 100 Days After or ONE Habit Tracker?

ONE Habit Tracker is rated higher. 100 Days After averages 4.2 out of 5 from 6 ratings, while ONE Habit Tracker averages 5.0 from 1 ratings.

### Do 100 Days After or ONE Habit Tracker have ads?

Neither 100 Days After nor ONE Habit Tracker shows ads.

### Which is updated more often, 100 Days After or ONE Habit Tracker?

100 Days After ships an update every 4 months, and ONE Habit Tracker every 2 months. Most recently, 100 Days After was updated on October 23, 2026 and ONE Habit Tracker on October 18, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*