Comparison

Reeder. vs Principal AI

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Reeder.

Consolidate your reading, watching, and listening into a single, unified timeline. Syncs seamlessly across devices and allows for easy sharing of curated content. Organize links and create custom views with powerful filters.

Highlights
  • Unified content timeline
  • Cross-device syncing
  • Shared public feeds
  • Customizable filters
  • Save and organize links
  • iCloud sync
Features
Read full description

Reeder is your all-in-one inbox for reading, watching and listening to content from various sources. From Unread Counts to Timeline Syncing Say goodbye to unread counts! With Reeder, your timeline position is synced across all your devices, letting you pick up right where you left off. Shared Feeds Turn any tag into a public, auto-updating feed that can be viewed in any browser or added to any RSS reader that supports JSON feeds, making it simple to share your curated content. Unified Timeline Reeder supports more than just RSS feeds. It integrates videos, podcasts and social media posts into a single, streamlined view. While it’s not meant to replace full-featured clients, Reeder offers a centralized way to keep track of everything you follow, with the option to open content in other apps (if supported) when you want to dive deeper. Filters Create custom timelines with filters based on keywords, media types or feed types. Save and Organize Links Easily save links from Safari or any other app to Reeder using its share extension, keeping everything organized and easy to find. iCloud Sync Reeder only syncs what’s important — your subscriptions, timeline position and tagged items (including Links, Favorites, Bookmarks and Later) — across all your devices using iCloud, making syncing faster and more efficient, with changes pushed to your other devices within seconds. Content is fetched directly from the sources, ensuring you always have the latest updates. Terms of Use: https://reeder.app/terms Privacy Policy: https://reeder.app/privacy

About

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.

Highlights
  • Live Activity Feed
  • File City visualization
  • Commit details
  • Commit timeline
  • Pull-to-refresh
  • Swipe navigation
Features
Read full description

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

Reeder.4 screens
Principal AI3 screens

Verdict

The call

The clearest difference is rating: Principal AI at 5.0 against Reeder.'s 4.3. Principal AI also leads on in-app purchases (none vs 2) and iOS requirement (15.1 vs 17.0). Reeder.'s advantage is ratings volume (907 vs 3). On price, update cadence, ads and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Reeder. sells 2 in-app purchases, starting at $1.99 per month. Principal AI asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Principal AI holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Reeder. has 907 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

Reeder. ships an update every 2 weeks, Principal AI every 4 weeks. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

Scorecard5 real differences · 5 level
Reeder. versus Principal AI: the parameters behind the verdict, then further details
ParameterReeder.Principal AI
PriceFreeFree
Rating4.3 (907 ratings)5.0 (3 ratings) — better
Positive reviews53.2% of reviews—
Number of ratings907 — better3
Update frequencyEvery 2 weeks — betterEvery 4 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPad, MaciPhone, iPad, iPod
Requires iOS17.015.1 — better
Further details — not scored
Size30 MB44 MB
Age rating17+4+
DeveloperSilvio RizziFernando Ramirez

Bugs and requests

Reeder.

Reported bugs

4 issues
  • Feeds failing to import or sync correctly
  • Inconsistent timeline ordering and display
  • Podcast and video playback issues
  • Crashes and stability problems

Requested features

6 requests
  • Add read/unread status indicators
  • Improve feed organization with folders
  • Provide more customization options for layout and typography
  • Integrate with third-party RSS services
  • Introduce keyboard shortcuts for common actions
Show 1 more
  • Add option to hide read/viewed content

Principal AI

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

Reeder.

Subscriptions2
  • Monthly$1.991 Month
  • Yearly$14.991 Year
None

Principal AI

No in-app purchases

Questions

Is Reeder. free?
Reeder. is free to download, with in-app purchases available.
Is Principal AI free?
Principal AI is free to download, with no in-app purchases.
Which has better reviews, Reeder. or Principal AI?
Principal AI is rated higher. Reeder. averages 4.3 out of 5 from 907 ratings, while Principal AI averages 5.0 from 3 ratings.
Do Reeder. or Principal AI have ads?
Neither Reeder. nor Principal AI shows ads.
Which is updated more often, Reeder. or Principal AI?
Reeder. ships an update every 2 weeks, and Principal AI every 4 weeks. Most recently, Reeder. was updated on November 4, 2026 and Principal AI on October 31, 2026.

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