Comparison

高校数学 数I〜数C 解法の最初の一手 vs Studypress

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

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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

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Studypress

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Studypress is an online study room where you study at a time you set. You enter the room at the time you booked and focus for 25 minutes. You can see the other people who booked the same time through a blurred camera. ■ How it works 1. Join a team When you sign up, you join a team automatically. 2. Book a slot in the online study room Pick any time from 0:00 to 24:00. Each slot is 25 minutes. You can book weekly slots or one-time slots for just that week. You can cancel up to 5 times a week. 3. Enter when it's time You can enter starting 5 minutes before the start. You can't enter after the start time. If you keep the waiting screen open, the slot starts automatically. Everyone in the room finishes at the same time. 4. Judged by time at your seat Stay 25 minutes for ○, 12 minutes or more for △, and anything shorter is recorded as × on your schedule. 5. Results for you and your team on Monday Reach your weekly goal and your level goes up; if everyone on the team reaches it, it goes up by 2. If you miss your goal, your level drops by 1 and you move to a new team. ■ Camera and sound • Video is blurred and is not recorded anywhere • Audio is not sent. The app never asks for microphone access ■ Features that help you focus • During a slot, 15 ambient sounds such as rain and a campfire play, each with its own background • Notifications 5 minutes and 1 minute before the start • Dim the screen during a slot • Your teammates' schedules and attendance history • A Home Screen widget shows your next slot and the slots you've completed this week • Records by subject and a look back at your stats ■ Studypress Pro Some features are available with Studypress Pro. You can see which ones on the Pro screen in the app. • On iPhone and iPad, an ad is shown after you book a slot. Ads are not shown with Studypress Pro ■ About subscriptions • Pro is available as monthly and yearly auto-renewing subscriptions, and as a one-time purchase • Payment is charged to your Apple ID when you confirm the purchase • Subscriptions renew automatically at the same price unless canceled at least 24 hours before the end of the current period • You can cancel anytime from "Subscriptions" in the App Store Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://ryoheihoriuchi0000.github.io/stadius-privacy-en.html

Screenshots

高校数学 数I〜数C 解法の最初の一手4 screens
Studypress4 screens

Verdict

The call

The clearest difference is ads: 高校数学 数I〜数C 解法の最初の一手 at none against Studypress'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). On price, update cadence, 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. 高校数学 数I〜数C 解法の最初の一手 sells 1 one-off in-app purchase and Studypress sells 6 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

高校数学 数I〜数C 解法の最初の一手 ships an update weekly, Studypress every 5 days. The most recent releases landed on October 28, 2026 and November 10, 2026 respectively.

Scorecard2 real differences · 4 level
高校数学 数I〜数C 解法の最初の一手 versus Studypress: the parameters behind the verdict, then further details
Parameter高校数学 数I〜数C 解法の最初の一手Studypress
PriceFreeFree
Update frequencyWeeklyEvery 5 days — better
AdsNo — betterYes
In-app purchasesYesYes
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.0 — better17.0
Further details — not scored
Size22 MB85 MB
Age rating4+4+
DeveloperGen NakanishiRyohei Horiuchi

In-app purchases

1 purchases

高校数学 数I〜数C 解法の最初の一手

One-time1
  • 全解放(すべての初手)$4.99
6 purchases

Studypress

Subscriptions2
  • Studypress Pro Monthly$3.991 Month
  • Studypress Pro Yearly7 Days trial$9.991 Year
One-time4
  • 1 Bait$0.49
  • 7 Bait$2.99
  • 13 Bait$4.99
Show 1 more
  • Studypress Pro Lifetime$29.99

Questions

Is 高校数学 数I〜数C 解法の最初の一手 free?
高校数学 数I〜数C 解法の最初の一手 is free to download, with in-app purchases available.
Is Studypress free?
Studypress is free to download, with in-app purchases available.
Do 高校数学 数I〜数C 解法の最初の一手 or Studypress have ads?
Studypress shows ads; 高校数学 数I〜数C 解法の最初の一手 does not.
Which is updated more often, 高校数学 数I〜数C 解法の最初の一手 or Studypress?
高校数学 数I〜数C 解法の最初の一手 ships an update weekly, and Studypress every 5 days. Most recently, 高校数学 数I〜数C 解法の最初の一手 was updated on October 28, 2026 and Studypress on November 10, 2026.

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