# AI Chat Assistant vs Lunar Calendar

The clearest difference is in-app purchases: Lunar Calendar at none against AI Chat Assistant's 2. Lunar Calendar also leads on update cadence (every 3 days vs every 3 weeks) and iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. AI Chat Assistant sells 2 in-app purchases, starting at $2.99 per 7 days. Lunar Calendar asks for nothing beyond the download.

AI Chat Assistant ships an update every 3 weeks, Lunar Calendar every 3 days. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | AI Chat Assistant | Lunar Calendar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Size | 58 MB | 27 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [DEVSRANK](https://appshunter.io/developer/1716669578) | [DNK Software International Company Limited](https://appshunter.io/developer/1024517118) |

## What reviewers say

### AI Chat Assistant

[App page](https://appshunter.io/ios/app/ai-chat-assistant-replyo/id6740520360)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chatbot Weekly | $2.99 | per 7 days |
| Chatbot Yearly | $14.99 | per year |


### Lunar Calendar

[App page](https://appshunter.io/ios/app/lunar-calendar-reminder/id6772409721)

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

**In-app purchases:** none


## Frequently asked questions

### Is AI Chat Assistant free?

AI Chat Assistant is free to download, with in-app purchases available.

### Is Lunar Calendar free?

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

### Do AI Chat Assistant or Lunar Calendar have ads?

Neither AI Chat Assistant nor Lunar Calendar shows ads.

### Which is updated more often, AI Chat Assistant or Lunar Calendar?

AI Chat Assistant ships an update every 3 weeks, and Lunar Calendar every 3 days. Most recently, AI Chat Assistant was updated on October 26, 2026 and Lunar Calendar on October 24, 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.*