高校数学 数I〜数C 解法の最初の一手 vs Sugoku
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
高校数学 数I〜数C 解法の最初の一手
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「この問題、まず何をする?」が一瞬で出てくる頭をつくる。 「初手」は、数学の問題を見た瞬間に“解法の最初の一手”を思い浮かべる力を、反射レベルまで鍛えるアプリです。完答は求めません。「まず何をするか」だけを、たくさん浴びて体に焼き付けます。 数学I・Aから数学II・B、さらに数学III・数学Cまで。理系受験でつかう範囲の「初手」がこの1本にそろいました。680をこえるパターン・4,500問以上を、1問数十秒のテンポで浴びられます。 初手は思い出せたのに、公式そのものがうろ覚えで手が止まる——そこを埋める「公式・定理集」も入っています。 ■ こんな人に ・公式は知ってるのに、問題を前にすると手が止まる ・応用問題で「どこから手をつければ?」と固まる ・共通テストや入試の過去問で、最初の一歩が思いつかない ・数III・数Cの極限/微分積分でも「まず何をするか」を反射で出したい ・短時間でテンポよく数学の感覚を鍛えたい ■ 特長 ・問題を見て「初手」を思い浮かべ、答え合わせ。1問数十秒のテンポ ・解けなかった所は責めない。「もう一度」にたまって、あとでやり直せる ・「鉄則帳」で覚えるべき定石を一覧。必須→発展まで自分のペースで ・「公式・定理集」で数I〜数Cの公式・定理を200件超、単元ごとに引ける。使いどころつき、必要なものには成立条件も ・問題と初手をセットで流し見する「ながめる」モード ・基礎の展開・因数分解から数III・数Cまで、同じ「初手」の考え方でひとつながり ■ 収録(数I・A・II・B・III・C — 理系受験でつかう範囲がまるごと) ・数学I+A: 数と式/集合と命題/2次関数/図形と計量(三角比)/データの分析/場合の数・確率/図形の性質/整数の性質 ・数学II+B: 式と証明/複素数と方程式/図形と方程式/三角関数/指数関数・対数関数/微分法・積分法/数列/統計的な推測/ベクトル ・数学III: 極限/微分法/積分法 ・数学C: 複素数平面/平面上の曲線(二次曲線・媒介変数・極座標) ※ ベクトルは新課程では数Cですが、受験の定番範囲として収録しています ※ 展開・因数分解は高校範囲の土台として、無料のウォームアップに収録しています ■ 無料と有料 ・一覧・鉄則帳・公式・定理集はずっと無料 ・カードは、入口の「数と式」なら全部、ほかの単元も単元ごとに最初に開いた3枚まで無料で見られる ・全単元を自分の手で解いて記録に残すには、一度きりの買い切りで解放
Sugoku
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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
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Verdict
The clearest difference is ads: 高校数学 数I〜数C 解法の最初の一手 at none against Sugoku's shown. 高校数学 数I〜数C 解法の最初の一手 also leads on iOS requirement (15.0 vs 17.0). Sugoku's advantage is update cadence (every 3 days vs weekly). 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
Both are free to download. 高校数学 数I〜数C 解法の最初の一手 sells 1 one-off in-app purchase and Sugoku sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
高校数学 数I〜数C 解法の最初の一手 ships an update weekly, Sugoku every 3 days. The most recent releases landed on October 14, 2026 and October 16, 2026 respectively.
| Parameter | 高校数学 数I〜数C 解法の最初の一手 | Sugoku |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly | Every 3 days — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 22 MB | 485 MB |
| Age rating | 4+ | 4+ |
| Developer | Gen Nakanishi | ryo otsuka |
In-app purchases
高校数学 数I〜数C 解法の最初の一手
- 全解放(すべての初手)$4.99
Sugoku
- プレミアムプラン$1.99
Questions
Is 高校数学 数I〜数C 解法の最初の一手 free?
Is Sugoku free?
Do 高校数学 数I〜数C 解法の最初の一手 or Sugoku have ads?
Which is updated more often, 高校数学 数I〜数C 解法の最初の一手 or Sugoku?
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