# KernelAI vs Hephaistos

The clearest difference is in-app purchases: KernelAI at none against Hephaistos's 6. Hephaistos's advantage is update cadence (every 2 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Hephaistos sells 6 in-app purchases, starting at $8.99 per month. KernelAI asks for nothing beyond the download.

KernelAI ships an update every 3 weeks, Hephaistos every 2 days. The most recent releases landed on October 24, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | KernelAI | Hephaistos |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (42 ratings)](https://appshunter.io/ios/app/kernelai-offline-ai-chat/id6757350731/reviews)** | — |
| Number of ratings | **42** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free | — |
| Size | 86 MB | 39 MB |
| Requires iOS | 16.4 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Anes Khadiri](https://appshunter.io/developer/1863184646) | [Logan Ablaoui](https://appshunter.io/developer/1874952906) |

## What reviewers say

### KernelAI

[App page](https://appshunter.io/ios/app/kernelai-offline-ai-chat/id6757350731)

This AI assistant operates entirely on your device, offering private, offline access to over 43 free models. It functions without an internet connection, ensuring your data remains secure and inaccessible to anyone but you. Enjoy AI capabilities anywhere, anytime, with no data collection or subscriptions.

**Highlights:** Private, offline AI operation, No internet required, Zero data collection, Access to 43+ free AI models, Vision AI for image analysis, File attachments for document understanding, Ad-free experience

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

**In-app purchases:** none


### 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 KernelAI free?

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

### Is Hephaistos free?

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

### Do KernelAI or Hephaistos have ads?

Neither KernelAI nor Hephaistos shows ads.

### Which is updated more often, KernelAI or Hephaistos?

KernelAI ships an update every 3 weeks, and Hephaistos every 2 days. Most recently, KernelAI was updated on October 24, 2026 and Hephaistos on October 19, 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.*