# Kai vs Harmony

The clearest difference is ads: Harmony at none against Kai's shown. Harmony also leads on device support (3 vs 1). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Kai sells 7 in-app purchases, starting at $4.99 per month and Harmony sells 1 in-app purchase, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Kai against 5.0 for Harmony. Both are backed by a comparable volume of ratings — 4 and 2 respectively.

Kai ships an update fortnightly, Harmony every 2 weeks. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Kai | Harmony |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/kai-gamified-habit-tracker/id6755117400/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/harmony-sync-relationship-app/id6759437951/reviews) |
| Number of ratings | **4** | 2 |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 120 MB | 11 MB |
| Requires iOS | 16.4 | **15.5** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Alexander Mayer](https://appshunter.io/developer/1776128059) | [Asmik Arustamyan](https://appshunter.io/developer/1878581956) |

## What reviewers say

### Kai

[App page](https://appshunter.io/ios/app/kai-gamified-habit-tracker/id6755117400)

This app gamifies habit tracking, turning goal setting into a rewarding journey. Build routines, earn rewards, and watch a virtual companion grow as you achieve your daily wins. It offers a private, offline experience with smart reminders and minimalist progress insights.

**Highlights:** Unlimited habit creation, Streak protection and momentum building, Unlockable badges and mascot items, Minimalist insights and growth trends, Personalized habit quiz, Offline core functionality, Smart, supportive reminders

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kai Plus | $4.99 | per month |
| Kai Plus | $9.99 | per 7 days |
| Kai Plus | $19.99 | per year |
| Kai Plus | $24.99 | per year |
| Kai Plus | $29.99 | per year |
| Kai Plus | $79.99 | per year |
| Kai Plus | $99.99 | one-time |


### Harmony

[App page](https://appshunter.io/ios/app/harmony-sync-relationship-app/id6759437951)

This app provides tools for couples to improve communication, resolve conflicts, and deepen emotional connection. It offers guided exercises and daily habits designed to strengthen bonds and foster understanding.

**Highlights:** Guided communication tools, Conflict resolution support, Daily connection habits, Relationship insights and tracking, Deepen emotional connection

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HarmonySync Premium | $5.99 | per month |


## Frequently asked questions

### Is Kai free?

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

### Is Harmony free?

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

### Which has better reviews, Kai or Harmony?

Kai and Harmony are both rated 5.0 out of 5 on the App Store, from 4 and 2 ratings respectively.

### Do Kai or Harmony have ads?

Kai shows ads; Harmony does not.

### Which is updated more often, Kai or Harmony?

Kai ships an update fortnightly, and Harmony every 2 weeks. Most recently, Kai was updated on October 30, 2026 and Harmony on November 5, 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.*