# TechFeed vs Principal AI

The clearest difference is monetization model: Principal AI at free against TechFeed's freemium. TechFeed's advantage is iOS requirement (13.0 vs 15.1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

TechFeed ships an update every 3 weeks, Principal AI every 4 weeks. The most recent releases landed on October 19, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | TechFeed | Principal AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/principal-ai/id6761268899/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 38.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 weeks |
| Monetization | Freemium | **Free** |
| Size | 267 MB | 44 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [OpenWeb Technology Corp.](https://appshunter.io/developer/1135796017) | [Fernando Ramirez](https://appshunter.io/developer/1846460167) |

## What reviewers say

### TechFeed

[App page](https://appshunter.io/ios/app/techfeed/id1135796018)

This app aggregates and delivers high-quality technical information for engineers. It features over 200 specialized channels, expert-curated content, and modes for different information needs. Users can also translate content and bookmark articles for later reading.

**Highlights:** High-quality technical information aggregation, Over 200 specialized engineer channels, Expert-curated content, Normal and Expert modes for information depth, Automatic translation for titles and comments, Bookmark integration with Hatena Bookmark and Pocket, Social network for IT engineers

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

**In-app purchases:** none


### Principal AI

[App page](https://appshunter.io/ios/app/principal-ai/id6761268899)

Visualize GitHub activity with a unique 2D representation of your repository's structure. Track commits, view file changes, and explore project history in an engaging, visual format. Designed for developers who appreciate code as an art form.

**Highlights:** Live Activity Feed, File City visualization, Commit details, Commit timeline, Pull-to-refresh, Swipe navigation

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

**In-app purchases:** none


## Frequently asked questions

### Is TechFeed free?

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

### Is Principal AI free?

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

### Do TechFeed or Principal AI have ads?

Neither TechFeed nor Principal AI shows ads.

### Which is updated more often, TechFeed or Principal AI?

TechFeed ships an update every 3 weeks, and Principal AI every 4 weeks. Most recently, TechFeed was updated on October 19, 2026 and Principal AI 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.*