Comparison

EssAI vs Sugoku

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

Head to head
About

EssAI

Features
Read full description

小論文と総合問題を、書いたその場で採点します。 大学入試の小論文は、書いても採点してもらえる機会がほとんどありません。EssAI は答案を送るとすぐに5つの観点で採点し、どこをどう直すかまで返します。 ■ 5つの観点で採点します ・論理構成(25点)主張から結論までの筋が通っているか ・根拠の質(25点)主張を支える事実や具体例があるか ・表現力(20点)読み手に伝わる日本語になっているか ・課題適合性(20点)設問が求めていることに答えているか ・独自性(10点)ありきたりでない視点があるか 各観点にS〜Dの評価と、次に何をすればよいかのコメントが付きます。 ■ 添削だけで終わらせません ・模範答案とあわせて「その答案が満たしている観点」を並べます。読むだけで終わらせず、自分の答案と1つずつ照らし合わせられます。 ・弱い文には書き直し例が付きます。どこが弱いのかを、その場で見比べられます。 ・採点のあと、AIがあなたの主張に反論します。答えるうちに論が深くなります。 ■ 志望校に合わせた練習 過去問を登録すると、出題の型(図表統合・多文書統合・要約+論述・精密読解)を判定し、その型に効く訓練を並べます。過去問から予想問題を作ることもできます。 ■ 総合問題にも対応 資料の読み比べ、統計の読み違いを見抜く練習、要約、短い論述。総合問題で問われる力を、部分練習から本番形式まで段階的に扱います。 ■ 塾・学校でのご利用 先生は生徒の提出状況とスコアの推移を一覧で確認でき、答案にコメントを返せます。生徒はクラスコードで参加します。 ■ 料金 ・無料:月3回まで採点できます ・スタンダード(月額 1,480円 / 年額 9,800円) ・シーズンパス(3ヶ月 3,800円)入試直前期向け 無料の範囲だけでも、5観点の採点と模範答案は同じものが返ります。 ※ 採点はAIが行います。同じ答案でも点数が数点ぶれることがあるため、複数回の採点を平均しています。1〜2点の差は「変化なし」として扱い、上がった・下がったと断定しません。 【サブスクリプションについて】 EssAI スタンダード(自動更新サブスクリプション) ・月額プラン ¥1,480 / 1か月ごとに自動更新 ・年額プラン ¥9,800 / 1年ごとに自動更新 ・シーズンパス ¥3,800 / 3か月ごとに自動更新 いずれのプランも、小論文・総合問題の採点回数の上限が解除されます。 お支払いは購入確定時にApple IDアカウントに請求されます。現在の期間が終了する24時間前までに自動更新をオフにしない限り、サブスクリプションは自動更新されます。更新の課金は、期間終了前の24時間以内に行われます。購入後は、iOSの「設定」>Apple ID>サブスクリプションから管理・解約できます。 利用規約(EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ サービス利用規約: https://shoronmon.vercel.app/terms プライバシーポリシー: https://shoronmon.vercel.app/privacy

About

Sugoku

Features
Read full description

Sugoku is a drill app for high school mathematics, shown the way it looks in a printed textbook: fractions stacked with a horizontal bar, √ with a vinculum, raised exponents, and ∫, Σ, lim rendered properly. Problems are generated on the fly, so you never run out of practice. WHAT YOU CAN PRACTICE - 235 topics covering the full Japanese high school curriculum (Math I, A, II, B, C, III): algebra and proof, quadratic functions, sets and logic, trigonometry, exponentials and logarithms, analytic geometry, differentiation and integration, sequences, statistical inference, vectors, complex plane, conic sections, limits and calculus. - Three difficulty levels, from fundamentals to university entrance exam level. - Answers are not forced to be integers: type fractions and radicals directly. The answer boxes show the shape of the answer, so you learn how results are written. - Figures label vertices, angles and side ratios; graphs plot key points (intercepts, vertex, center). - Missed problems come back immediately. Bookmarks and mistake analysis let you drill only your weak spots. KYOKUISEN (RANKING) - A daily rating match with a leaderboard grouped by school year. - One attempt per day; watch a video ad to add attempts, up to three per day. - Your nickname and rating are visible to other players. Do not enter your real name or anything you would not want public. - Offline, your own records are shown instead. SUGOKU PREMIUM (IN-APP PURCHASE) - Removes ads. - Three Kyokuisen attempts every day, no video ads needed. - 20 coins at the start of each Kyokuisen season. - Bookmarks up to 500 items (20 on the free tier). - Answer timer with time analysis, plus the Sakura skin. - One-time purchase. Restore from the settings screen. COMMON TEST PREP PLAN (AUTO-RENEWABLE SUBSCRIPTION) - Topic-by-topic practice booklets in the style of Japan's Common Test (in Japanese). One booklet per field (14 in total) is free; the rest are included in the Common Test Prep Plan. - Monthly plan: ¥480 per month. Yearly plan: ¥3,800 per year (prices in Japan; other regions follow the App Store price). - Payment is charged to your Apple ID at confirmation of purchase. The subscription renews automatically for the same period and price unless auto-renew is turned off at least 24 hours before the end of the current period. - Manage or cancel in your device's Settings > Apple ID > Subscriptions. Restore purchases from the subscription screen. ADS - On the free tier, banner ads appear on the topic list and the result screen. - Video ads play only when you choose to add a Kyokuisen attempt. Ads never interrupt you mid-problem. PLEASE NOTE - The app is available in English and Japanese. When your device language is not Japanese, problem statements, answer fields and choices are shown in English. Hints, step-by-step explanations and Common Test prep booklets remain in Japanese. - Requires iOS 17.0 or later, iPhone and iPad. Study records are stored on your device. Leaderboard data is stored in Apple CloudKit. See the privacy policy for details, or contact us through the support page. Terms of Use: https://ottub.github.io/sugoku/terms.html Privacy Policy: https://ottub.github.io/sugoku/privacy-policy.html

Screenshots

EssAI4 screens
Sugoku4 screens

Verdict

The call

The clearest difference is ads: EssAI at none against Sugoku's shown. EssAI also leads on iOS requirement (15.1 vs 17.0). Sugoku's advantage is update cadence (every 3 days vs every 6 weeks). On price, in-app purchases 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. EssAI sells 2 in-app purchases, starting at $22.99 per 3 months and Sugoku sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

EssAI ships an update every 6 weeks, Sugoku every 3 days. Both last shipped on October 25, 2026.

Scorecard3 real differences · 3 level
EssAI versus Sugoku: the parameters behind the verdict, then further details
ParameterEssAISugoku
PriceFreeFree
Update frequencyEvery 6 weeksEvery 3 days — better
AdsNo — betterYes
In-app purchasesYesYes
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.1 — better17.0
Further details — not scored
Size41 MB615 MB
Age rating4+4+
DeveloperRYUKI KONNAMIryo otsuka

In-app purchases

2 purchases

EssAI

Subscriptions2
  • シーズンパス(3ヶ月)$22.993 Months
  • スタンダード(年額)$59.991 Year
3 purchases

Sugoku

Subscriptions2
  • Monthly$2.991 Month
  • Yearly$22.991 Year
One-time1
  • プレミアムプラン$1.99

Questions

Is EssAI free?
EssAI is free to download, with in-app purchases available.
Is Sugoku free?
Sugoku is free to download, with in-app purchases available.
Do EssAI or Sugoku have ads?
Sugoku shows ads; EssAI does not.
Which is updated more often, EssAI or Sugoku?
EssAI ships an update every 6 weeks, and Sugoku every 3 days. Most recently, EssAI was updated on October 25, 2026 and Sugoku on October 25, 2026.

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