Comparison

StudyJunkie vs Toi Lock

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

Head to head
About

StudyJunkie

Features
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StudyJunkie turns every app-opening moment into a study opportunity. Before you can open social media, games, or any app you choose, you must answer a quiz. Powered by iOS Screen Time (Family Controls), StudyJunkie puts a smart learning gate between you and distraction. HOW IT WORKS 1. Select apps you want to restrict 2. When you try to open them, a quiz appears 3. Answer correctly to unlock the app for your chosen duration QUIZ CATEGORIES - Math: auto-generated calculation problems (Jr. High / High School level) - English Vocabulary: 3,700+ words with audio (Jr. High, High School, TOEIC) - Pharmaceuticals: brand name and generic name matching - Custom: create your own questions for any subject FEATURES - 7 difficulty levels (Jr. High 1-3, High School 1-3, TOEIC) - Word memory tracking: words answered correctly 3+ times are marked learned - Combo system: keep your streak going! - ZONE mode: triggered at 5+ combos for a special effect - Detailed stats: total answers, accuracy, best streak, and more - Custom quiz creator: add any question you need - Bilingual UI: Japanese and English supported - No data collection: your study data stays on your device

About

Toi Lock

Features
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ToiLock は、暗記カードを解いてアプリを解除できるスクリーンタイムアプリです。 SNSやゲームを開く前に、単語・用語・英語・資格問題など、自分で作成した暗記カードに答えることで解除できます。 「つい開いてしまう時間」を、「少しだけ勉強する時間」に変える。 学習習慣づくりをサポートします。 こんな人におすすめ ・スマホ時間を減らしたい ・勉強習慣を作りたい ・単語帳を毎日続けたい ・資格試験や語学学習をしている ・集中力を保ちたい 主な機能 ○ スクリーンタイム ・時間帯ごとのロック設定 ・使用時間によるロック設定 ・一時解除機能 ・アプリごとにグループ管理 ・自分に合ったルールを作成 暗記カード ・オリジナル暗記カードを作成 ・表裏カード対応 ・タグ管理 ・画像付きカード対応 ・共有 / インポート対応 ToiLock は、Apple の Screen Time API を利用して動作します。 保護者向け監視アプリではなく、自己管理・学習支援を目的としたアプリです。

Screenshots

StudyJunkie3 screens
Toi Lock4 screens

Verdict

The call

The clearest difference is in-app purchases: StudyJunkie at none against Toi Lock's 3. Toi Lock's advantage is update cadence (weekly vs every 2 weeks). On price, ads, device support and iOS requirement 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. Toi Lock sells 3 one-off in-app purchases. StudyJunkie asks for nothing beyond the download.

UpkeepUpdate frequency

StudyJunkie ships an update every 2 weeks, Toi Lock weekly. The most recent releases landed on September 28, 2026 and September 14, 2026 respectively.

Scorecard2 real differences · 4 level
StudyJunkie versus Toi Lock: the parameters behind the verdict, then further details
ParameterStudyJunkieToi Lock
PriceFreeFree
Update frequencyEvery 2 weeksWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad — betteriPhone
Requires iOS18.0 — better18.2
Further details — not scored
Size10 MB5 MB
Age rating4+4+
DeveloperKAZUHIRO KAMAKURAMasami Mitsuta

In-app purchases

None

StudyJunkie

No in-app purchases

3 purchases

Toi Lock

One-time3
  • Card Capacity +50$0.99
  • Card Capacity +500$4.99
  • Card Capacity +2000$9.99

Questions

Is StudyJunkie free?
StudyJunkie is free to download, with no in-app purchases.
Is Toi Lock free?
Toi Lock is free to download, with in-app purchases available.
Do StudyJunkie or Toi Lock have ads?
Neither StudyJunkie nor Toi Lock shows ads.
Which is updated more often, StudyJunkie or Toi Lock?
StudyJunkie ships an update every 2 weeks, and Toi Lock weekly. Most recently, StudyJunkie was updated on September 28, 2026 and Toi Lock on September 14, 2026.

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