Comparison

AnnoReader vs Curios

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

Curios

Features
Read full description

英語のクイズで、語彙と世界の教養を一緒に学ぶ。Curiosは、科学・歴史・文化・地理などの話題を英語で楽しめる学習アプリです。 【毎日の学習を短いクイズで】 ・1日5問から学習をスタート ・英語の問題と日本語訳で理解をサポート ・回答後は英語と日本語の解説で振り返り ・問題文・選択肢・解説を英語の音声で確認 ・中断したクイズを続きから再開 【学んだ内容を復習】 ・間違えた問題にもう一度挑戦 ・気になった単語を自分で保存 ・学習履歴と毎日の目標で継続をサポート 【無料でできること】 1日10問の新しい問題、解説、英語の読み上げ、同じセットの再挑戦を利用できます。無料版には広告が表示される場合があります。 【買い切りPremium】 広告非表示、1日の出題上限の解除、間違えた問題をまとめた復習、保存した単語の復習デッキを利用できます。購入は1回限りで、自動更新のサブスクリプションではありません。価格はアプリ内の購入画面で確認できます。 試験対策に加えて、英語で知る楽しさを毎日の習慣に。

Screenshots

AnnoReader4 screens
Curios3 screens

Verdict

The call

The clearest difference is device support: AnnoReader at 3 against Curios's 1. AnnoReader also leads on iOS requirement (15.6 vs 17.0). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. AnnoReader sells 4 in-app purchases, starting at $1.49 per month and Curios sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

AnnoReader ships an update monthly, Curios every 2 months. The most recent releases landed on October 7, 2026 and October 30, 2026 respectively.

Scorecard2 real differences · 6 level
AnnoReader versus Curios: the parameters behind the verdict, then further details
ParameterAnnoReaderCurios
PriceFreeFree
Positive reviews69.2% of reviews—
Update frequencyMonthly — betterEvery 2 months
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.6 — better17.0
Further details — not scored
Size95 MB8 MB
Age rating4+12+
DeveloperHironobu SaitoShunsuke Asai

In-app purchases

4 purchases

AnnoReader

Subscriptions4
  • Basic(monthly)7 Days trial$1.491 Month
  • Basic Plus(Monthly)7 Days trial$3.491 Month
  • Pro(Monthly)$4.991 Month
Show 1 more
  • Pro Plus (Monthly)$11.991 Month
1 purchases

Curios

One-time1
  • 買い切りPremium$5.99

Questions

Is AnnoReader free?
AnnoReader is free to download, with in-app purchases available.
Is Curios free?
Curios is free to download, with in-app purchases available.
Do AnnoReader or Curios have ads?
Both AnnoReader and Curios show ads.
Which is updated more often, AnnoReader or Curios?
AnnoReader ships an update monthly, and Curios every 2 months. Most recently, AnnoReader was updated on October 7, 2026 and Curios on October 30, 2026.

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