# Master One vs CountCal

The clearest difference is in-app purchases: CountCal at none against Master One's 1. CountCal also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 2 months). On price and iOS requirement there is nothing between them.

Both are free to download. Master One sells 1 one-off in-app purchase. CountCal asks for nothing beyond the download.

Master One ships an update every 2 months, CountCal every 2 weeks. The most recent releases landed on September 24, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Master One | CountCal |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/master-one-habit-builder/id6504889928/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 3 MB | 13 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Mary Ogawa](https://appshunter.io/developer/1615657857) | [Youru Tan](https://appshunter.io/developer/6800798459) |

## What reviewers say

### Master One

[App page](https://appshunter.io/ios/app/master-one-habit-builder/id6504889928)

This app guides you in building habits by focusing on one at a time. You can set custom durations, track your progress and streaks, and review your completed habits. It offers a clean, distraction-free interface with options to archive or restart habits.

**Highlights:** One habit focus, Custom habit durations, Streak and history tracking, Mastered habits archive, Minimalist design, Archive and restart habits, Strict mode for perfect streaks

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LIFE_PURCHASE | $0.99 | one-time |


### CountCal

[App page](https://appshunter.io/ios/app/countcal-day-tracker/id6800798457)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Master One free?

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

### Is CountCal free?

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

### Do Master One or CountCal have ads?

Master One shows ads; CountCal does not.

### Which is updated more often, Master One or CountCal?

Master One ships an update every 2 months, and CountCal every 2 weeks. Most recently, Master One was updated on September 24, 2026 and CountCal on September 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.*