# STS2 vs ChatMax AI Chatbot Assistant

The clearest difference is in-app purchases: STS2 at none against ChatMax AI Chatbot Assistant's 9. STS2 also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. ChatMax AI Chatbot Assistant sells 9 in-app purchases, starting at $4.99 per 7 days. STS2 asks for nothing beyond the download.

STS2 ships an update every 2 months, ChatMax AI Chatbot Assistant every 4 weeks. The most recent releases landed on September 6, 2026 and August 13, 2026 respectively.

## The numbers

| Metric | STS2 | ChatMax AI Chatbot Assistant |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.8 (13 ratings)](https://appshunter.io/ios/app/chatmax-ai-chatbot-assistant/id6445909511/reviews)** |
| Number of ratings | — | **13** |
| Positive reviews | — | 42.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 76 MB | 42 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [中铁工程装备集团有限公司](https://appshunter.io/developer/1447605449) | [Greycat Network Tech Co., Ltd](https://appshunter.io/developer/1635132210) |

## What reviewers say

### STS2

[App page](https://appshunter.io/ios/app/sts2/id6444602139)

**Features:** Vision Pro support

**In-app purchases:** none


### ChatMax AI Chatbot Assistant

[App page](https://appshunter.io/ios/app/chatmax-ai-chatbot-assistant/id6445909511)

Get instant, comprehensive answers to your questions with an advanced AI chatbot. This tool provides tailored advice, creative inspiration, and professional input for various writing needs, from stories to translations.

**Highlights:** Instant answers to questions, AI-powered writing assistance, Creative content generation, Language practice and translation, Tailored advice and professional input, Information retrieval on any topic

**Features:** macOS Compatibility

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro | $4.99 | per 7 days |
| Weekly Membership | $6.99 | per 7 days |
| Weekly Lite | $7.99 | per 7 days |
| Month Pro | $15.99 | per month |
| Month Pro | $19.99 | per month |
| Chat AI Lifetime | $39.99 | per year |
| Yearly Lite | $49.99 | per year |
| 1 Year Plan for the Best Price | $59.99 | per year |
| Yearly Advanced | $69.99 | per year |


## Frequently asked questions

### Is STS2 free?

STS2 is free to download, with no in-app purchases.

### Is ChatMax AI Chatbot Assistant free?

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

### Do STS2 or ChatMax AI Chatbot Assistant have ads?

ChatMax AI Chatbot Assistant shows ads; STS2 does not.

### Which is updated more often, STS2 or ChatMax AI Chatbot Assistant?

STS2 ships an update every 2 months, and ChatMax AI Chatbot Assistant every 4 weeks. Most recently, STS2 was updated on September 6, 2026 and ChatMax AI Chatbot Assistant on August 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.*