# CAI Chat AI vs Hephaistos

The clearest difference is ads: Hephaistos at none against CAI Chat AI's shown. Hephaistos also leads on update cadence (every 2 days vs every 4 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. CAI Chat AI sells 9 in-app purchases, starting at $4.99 per 7 days and Hephaistos sells 6 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.

CAI Chat AI ships an update every 4 weeks, Hephaistos every 2 days. The most recent releases landed on November 3, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | CAI Chat AI | Hephaistos |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (121 ratings)](https://appshunter.io/ios/app/cai-chat-ai-poly-ai-assistant/id6447175075/reviews)** | — |
| Number of ratings | **121** | — |
| Positive reviews | 92.4% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 84 MB | 39 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 12+ | 4+ |
| Developer | [Jon Hui](https://appshunter.io/developer/6802981380) | [Logan Ablaoui](https://appshunter.io/developer/1874952906) |

## What reviewers say

### CAI Chat AI

[App page](https://appshunter.io/ios/app/cai-chat-ai-poly-ai-assistant/id6447175075)

This AI chatbot offers a versatile platform for chatting, writing, voice conversations, smart search, and image generation. It allows users to compare answers from multiple AI models within a single conversation and provides tools for content creation, homework help, and even calorie tracking.

**Highlights:** AI Chatbot and AI Writer, Voice Chat with natural responses, AI Smart Search with real-time web data, Image generation from prompts, Document scanning and text extraction, AI Calorie and Meal Tracker, Role-based AI assistants

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro Subscription | $4.99 | per 7 days |
| Weekly Subscription | $6.99 | per 7 days |
| Monthly Pro Subscription | $6.99 | per month |
| Monthly Subscription | $9.99 | per month |
| Weekly Premium Subscription | $14.99 | per 7 days |
| Monthly Subscription (Secret) | $19.99 | per month |
| Monthly Premium Subscription | $19.99 | per month |
| Annual Subscription | $39.99 | per year |
| Annual Premium Subscription | $59.99 | per year |

**What reviewers like**

- 🚀 Fast and efficient responses
- 👍 User-friendly interface
- 💡 Versatile AI models (ChatGPT, Gemini, Claude)
- 💡 Image generation feature
- 💡 Voice interaction/text-to-speech

**What reviewers complain about**

- 🐛 Limits on free version/questions
- 🐛 Frustrating hidden limits on conversations
- 🐛 Occasional minor glitches

**Reported bugs**

- Demo version not working/limited questions
- Hidden limits on AI conversations

**Requested features**

- More music-related prompts
- Support for more languages


### Hephaistos

[App page](https://appshunter.io/ios/app/hephaistos/id6761625537)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Spark (monthly) | $8.99 | per month |
| Flame (monthly) | $24.99 | per month |
| Titan (monthly) | $44.99 | per month |
| Spark (yearly) | $89.99 | per year |
| Flame (yearly) | $249.00 | per year |
| Titan (yearly) | $399.00 | per year |


## Frequently asked questions

### Is CAI Chat AI free?

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

### Is Hephaistos free?

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

### Do CAI Chat AI or Hephaistos have ads?

CAI Chat AI shows ads; Hephaistos does not.

### Which is updated more often, CAI Chat AI or Hephaistos?

CAI Chat AI ships an update every 4 weeks, and Hephaistos every 2 days. Most recently, CAI Chat AI was updated on November 3, 2026 and Hephaistos on October 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.*