TechFeed vs Principal AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TechFeed
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.
- 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
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TechFeed Pro is "the strongest on earth" information service and social network for engineers. The predecessor, "TechFeed", was a service where algorithms automatically collect and aggregate technical information from around the world and deliver it to users. The higher-level version, "TechFeed Pro", utilizes the results of direct hearings and user tests from over 30 experts, making it an information service for engineers that is unique in the world. [High information quality] The information gathering algorithm has been designed from scratch to provide highly professional and high quality information in real time. Many experts have said that "no noise" and "you can find information that you cannot find anywhere else". [Over 200 specialized channels] TechFeed "channels" are over 200 online communities designed exclusively for engineers. Just join the channel and you'll get everything your engineers want to know in real time, from release to pull request. The information on the channel is constantly updated by us with the help of experts. No more maintenance of information sources. [Aim Expert! Expert mode installed! ] There are two modes for following channels. Usually in normal mode. We will meet the needs of "I don't need too detailed information, but I want to keep up with trends." In contrast to Expert Mode information, Expert Mode allows you to obtain high-level information from overseas experts in real time. An information experience that was realized because we thoroughly analyzed the needs and technical information of engineers. Switch easily according to your level of interest and understanding. [Automatic translation and bookmarks] Engineers, anyway, I would like to touch on primary English information and high-quality information. TechFeed will fully support such engineers. Equipped with an automatic translation function for titles and comments. But again, it takes time to read English. So you need to read it later. Therefore, TechFeed has a highly functional bookmark button that works in conjunction with Hatena Bookmark and Pocket. [Building a social network specialized for IT engineers] The new TechFeed is thoroughly social. Follow a user to receive their activity in real time. Which articles you bookmarked, shared, read. Your friends and experts will give you the information you missed.
Principal AI
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.
- Live Activity Feed
- File City visualization
- Commit details
- Commit timeline
- Pull-to-refresh
- Swipe navigation
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Principal AI transforms GitHub activity into a visual experience. Watch commits come to life through File City — a two dimensional visualization that turns your repository's structure. WHAT YOU'LL SEE • Live Activity Feed — Recent commits from featured repositories, grouped by hour • Change Visualizations — Changed Files Highlighted • Commit Details — Author, message, timestamps, and code stats at a glance • Commit Timeline — Swipe through commits and watch the city change with each one DESIGNED FOR DEVELOPERS Built for those who appreciate code as craft. Whether you're tracking your favorite open source projects or just want a beautiful way to see what's happening in the developer world, Principal AI brings GitHub activity to your pocket. FEATURES • Pull-to-refresh to see the latest commits • Swipe vertically between repositories • Swipe horizontally between commits • Tap the commit timeline to jump between changes No account required to browse the activity feed. From Noetic Labs — building tools for developers who see code differently.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | TechFeed | Principal AI |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (3 ratings) — better |
| Positive reviews | 38.5% of reviews | — |
| Number of ratings | — | 3 — better |
| Update frequency | Every 3 weeks — better | Every 4 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Freemium | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 267 MB | 44 MB |
| Age rating | 17+ | 4+ |
| Developer | OpenWeb Technology Corp. | Fernando Ramirez |
In-app purchases
TechFeed
No in-app purchases
Principal AI
No in-app purchases









