# Chat AI vs Linear System Solver

The clearest difference is price: Chat AI at Free against Linear System Solver's $0.99. Linear System Solver's advantage is in-app purchases (none vs 4) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

Chat AI is free to download; Linear System Solver costs $0.99 up front. Chat AI sells 4 in-app purchases, starting at $7.99 per 7 days. Linear System Solver asks for nothing beyond the download.

Chat AI ships an update every 10 days, Linear System Solver every 3 days. The most recent releases landed on October 19, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Chat AI | Linear System Solver |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.6 (1.1K ratings)](https://appshunter.io/ios/app/chat-ai-personal-assistant/id1671341729/reviews)** | — |
| Number of ratings | **1.1K** | — |
| Positive reviews | 74.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 10 days | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 82 MB | 1 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Evoplex](https://appshunter.io/developer/1643679195) | [Luigi Fonti](https://appshunter.io/developer/360904185) |

## What reviewers say

### Chat AI

[App page](https://appshunter.io/ios/app/chat-ai-personal-assistant/id1671341729)

Engage in deep conversations with an advanced AI chatbot on any topic. Chat with virtual celebrity personas and get assistance with creative tasks, learning, or professional needs. The app offers an intuitive interface for easy navigation and conversation history tracking.

**Highlights:** AI chatbot conversations, Virtual celebrity chats, Personalized assistance, Intuitive interface, Conversation history, Learning AI

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $7.99 | per 7 days |
| Premium | $14.99 | per month |
| Premium | $49.99 | per year |
| Premium | $49.99 | per year |

**What reviewers like**

- 👍 Great AI assistant
- 💡 Ability to create custom AI personas
- 🚀 Fast and responsive
- 😊 Enjoyable user experience

**What reviewers complain about**

- 🐛 Occasional bugs and glitches
- 💰 Expensive subscription
- 🔒 Privacy concerns
- ⏳ Limited chat duration

**Reported bugs**

- Chat ending unexpectedly
- Inability to retrieve past conversations
- Inconsistent AI responses

**Requested features**

- Ability to save and continue conversations
- Integration with video calling
- More customization options
- Offline mode


### Linear System Solver

[App page](https://appshunter.io/ios/app/linear-system-solver/id6469396751)

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

**In-app purchases:** none


## Frequently asked questions

### Is Chat AI free?

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

### Is Linear System Solver free?

Linear System Solver costs $0.99, with no in-app purchases.

### Do Chat AI or Linear System Solver have ads?

Chat AI shows ads; Linear System Solver does not.

### Which is updated more often, Chat AI or Linear System Solver?

Chat AI ships an update every 10 days, and Linear System Solver every 3 days. Most recently, Chat AI was updated on October 19, 2026 and Linear System Solver on October 12, 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.*