StarPterano vs BiasCheck
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
StarPterano
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StarPterano is a client application for Mastodon, a distributed social networking service. It features a large amount of information that can be viewed, a light operation feel, and a wealth of unique functions. 【Features of StarPterano】 The timeline is displayed in full screen, and can be displayed in multi-columns on the iPad. The background color of selected posts on the timeline changes, as does the color of related posts. Pinch in/out to show/uncheck mini-view for quick viewing of a large number of posts. Pinch out to zoom in and out to see even hard-to-see custom emojis. Pinch out to zoom in and out to see custom emojis that are hard to see. Swipe left or right to switch between multiple accounts easily. A variety of settings are available, including text and icon size, freely selectable accent colors, and relative/absolute time display. Post input can be done while displaying the timeline. Streaming support Automatic CW expansion Long text is automatically displayed with its height limited so that it does not get in the way. Supports custom emoji animations. 【Supported features】 Use of multiple accounts, reply/boost/favorite/bookmark operations for posts on different accounts Timeline streaming Display of custom emoji, emoji picker Post posting functions (images, public range, CW, NSFW) Boosting, favoriting, and bookmarking See who has favorite/boosted a post Conversation display with in_reply_to Animated display of icons and custom emoji Video playback, video posting (compressed) Post GIF animations List function Search function for tags, users, and posts Profile editing Integrated local and home view Reserved postings Polls (post polls, view polls, participate in polls) Editing of posts NowPlaying post, which allows you to post the name of the song that is currently playing. Custom emoji picker ・Display reply destinations and hashtag and emoji suggestions while typing from "@", "#", and ":". Follow hashtags Explore trending posts, hashtags, news, and recommended users Translation function Emoji reactions (Only servers that support fedibird API) 【Notes】 Push notification function is not supported. Filtering function is not supported.
BiasCheck
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Bias analyzes any webpage, article, or selected text and tells you exactly how slanted it is — politically, emotionally, and factually — using on-device AI. No accounts. No servers. No data ever leaves your device. HOW IT WORKS Enable Bias in Safari (Settings → Safari → Extensions → Bias). Then tap the Bias icon in Safari's toolbar to analyze the current page. Or long-press any selected text and tap "Check Bias" from the menu. WHAT YOU GET • Political Lean — a left-to-right spectrum showing where the content sits, from Far Left to Far Right • Bias Score — 0–100 neutrality score so you can compare sources at a glance • Truthiness Score — how factually grounded the content appears • Bias Types — Framing Bias, Loaded Language, Appeal to Emotion, Confirmation Bias, and 18 more • Emotional Tone — Neutral, Sensational, Fear-Mongering, Inflammatory, and more • Summary — a plain-English explanation of what bias is present and why • Key Phrases — the exact quotes driving the detected bias COMPLETELY PRIVATE Everything runs on your device using Apple's on-device AI. Your text, history, and settings never touch a server. Deleting the app permanently removes all stored data. SAFARI EXTENSION Bias adds a "Check Bias" option to Safari's long-press menu for any selected text. Results appear instantly in the extension popup without leaving the page you're reading. HISTORY Every analysis is saved locally so you can review and compare past results across sessions. No subscription. No API keys. No accounts. Just clarity.
Screenshots
Verdict
The clearest difference is device support: StarPterano at 4 against BiasCheck's 2. StarPterano also leads on iOS requirement (13.0 vs 15.0). On price, 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.
| Parameter | StarPterano | BiasCheck |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 days | — |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPod |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 20 MB | 7 MB |
| Age rating | 17+ | 17+ |
| Developer | SEGO Takayoshi | JASON ARBON |
In-app purchases
StarPterano
No in-app purchases
BiasCheck
No in-app purchases









