AnnoReader vs ロボットアーム
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
AnnoReader
This app visually breaks down English sentences to improve grammar understanding and reading comprehension. It offers annotation, translation, and text-to-speech features to aid learners in mastering sentence structure and fluency.
- Visual syntax analysis of sentences
- Phrase and clause translation
- Text-to-speech with accent options
- AI grammar checking
- OCR for text capture
- Dictionary lookup and phrasal verb meanings
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AnnoReader: English Grammar Learning Tool AnnoReader is an "English Grammar Learning Tool" designed for English language learners. It helps improve reading comprehension by making sentence structure and modification relationships instantly visible. Purpose This app was developed to address common challenges faced by English learners, such as: - Wanting to learn English grammar more effectively - Difficulty identifying phrases and clauses - Trouble distinguishing the five sentence patterns (SVOC) - Preparing for long passages in tests like TOEIC - Desire to read more fluently With translation and text-to-speech features, AnnoReader can also be used for listening and speaking practice beyond grammar study. Key Features English Annotation (Syntax Analysis) - Visualizes clauses, phrases, and modification relationships - Displays parts of speech for words - Provides dictionary lookup for words - Shows meanings of phrasal verbs - Highlights the five sentence patterns (SVOC) - Underlines compound words Translation - Displays translations by phrase and clause units - Supports various languages, including Japanese Text-to-Speech - High-quality native speaker voice for reading English text - Four accent options: American, British, Australian, and Indian - Allows simultaneous grammar and listening practice - Repeat function and timed rewind feature for enhanced learning AI Grammar Check - AI-powered checking of inputted English text - Easily identifies grammatical errors and typos Camera Function (OCR) - Captures English text from books or documents using the built-in camera - Performs annotation on the captured text Multiple Input Methods - Direct text input - Paste from clipboard - Import text via iOS share function Customization Settings - Adjustable font and annotation settings to suit user preferences For more information: - Terms of Service: https://annoreader.com/ja/terms_of_service - Privacy Policy: https://annoreader.com/ja/privacy
ロボットアーム
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グラフ上にロボットアームを描画します。 長さと角度を入力するとアームがその姿勢をとります。 関節の座標も表示することができます。 ※本アプリの不具合により発生する不都合については責任を負い兼ねますことご了承ください。
Screenshots
Verdict
The clearest difference is in-app purchases: ロボットアーム at none against AnnoReader's 4. ロボットアーム also leads on update cadence (every 2 weeks vs monthly). AnnoReader's advantage is iOS requirement (15.6 vs 17.6.1). On price, 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
Both are free to download. AnnoReader sells 4 in-app purchases, starting at $1.49 per month. ロボットアーム asks for nothing beyond the download.
AnnoReader ships an update monthly, ロボットアーム every 2 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.
| Parameter | AnnoReader | ロボットアーム |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 69.2% of reviews | — |
| Update frequency | Monthly | Every 2 weeks — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 17.6.1 |
| Further details — not scored | ||
| Size | 95 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Hironobu Saito | Risako Asai |
In-app purchases
AnnoReader
- Basic(monthly)7 Days trial$1.491 Month
- Basic Plus(Monthly)7 Days trial$3.491 Month
- Pro(Monthly)$4.991 Month
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- Pro Plus (Monthly)$11.991 Month
ロボットアーム
No in-app purchases









