Human Factor vs AcoustioNary
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Human Factor
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殺人事件を解くように、英文法を身につける。 Human Factorは、殺人ミステリーのストーリーを聴きながら英語の文法を学ぶ、新しいタイプの英語学習アプリです。 全13エピソードの犯罪ドラマを通じて、名詞・形容詞から仮定法まで、英文法の基礎を体系的に学べます。各エピソードには物語トラックと文法ガイドトラックの2つが収録されています。 ▼ ストーリー 若い女性の不審死。刑事ワトソンが捜査を進めるにつれ、被害者の恋人、新聞記者、編集長、そしてマフィアの影が浮かび上がる。事件の真相は、あなたの文法力で解き明かされます。 ▼ 特徴 ・全13エピソード × 2トラック(ストーリー+文法ガイド) ・日本語と英語のバイリンガル構成 ・オリジナルの音声ドラマ ・歌詞表示付きのオーディオプレーヤー ・Play All機能で全エピソードを連続再生 ▼ 学べる文法項目 Episode 1: 名詞と形容詞 Episode 2: 疑問詞 Episode 3: 時制 Episode 4: 場所を表す表現 Episode 5: 方法や手段を表す表現 Episode 6: 人物を表す表現 Episode 7: 動作と進行形 Episode 8: 理由を表す表現 Episode 9: 推測と可能性 Episode 10: 命令形 Episode 11: 受動態と間接話法 Episode 12: 推測の表現 Episode 13: 仮定法と助動詞 犯罪ドラマの緊張感の中で、自然に英文法が身につきます。
AcoustioNary
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Learn English inside a guitar world. Every example sentence in AcoustioNary is about guitars — practice, tone, recording, performing, buying, and guitar culture — so you build real English while staying close to something you love. Features • 1,500+ leveled vocabulary cards, from basic to advanced • Fill-in-the-blank questions (vocabulary + grammar, prepositions, collocations) • Reading passages with comprehension questions • Listening & pronunciation (on-device text-to-speech; works offline) • A review queue of what you miss, plus a re-practice session • Per-level focus mode • Japanese/English UI, Light/Night (warm dark) themes • Free to use — watch a short rewarded video to unlock another 45 minutes of practice. One-tap "Remove ads forever" available as a one-time in-app purchase. Terms & Privacy By using the app you agree to the Terms of Use (EULA). • Terms of Use / EULA: https://app-docs.tonebeyond.jp/AcoustioNary-terms.html • Privacy Policy: https://app-docs.tonebeyond.jp/AcoustioNary-privacy-policy.html ■ Level guide Entry, Beginner, Intermediate, Advanced, and Expression are AcoustioNary's own communication goals. They do not represent exam grades or scores.
Screenshots
Verdict
The clearest difference is in-app purchases: Human Factor at none against AcoustioNary's 4. AcoustioNary's advantage is iOS requirement (17.0 vs 26.2). On price 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. AcoustioNary sells 4 one-off in-app purchases. Human Factor asks for nothing beyond the download.
| Parameter | Human Factor | AcoustioNary |
|---|---|---|
| Price | Free | Free |
| Update frequency | — | Every 2 days |
| Ads | — | No |
| In-app purchases | No — better | Yes |
| Devices | — | iPhone — better |
| Requires iOS | 26.2 | 17.0 — better |
| Further details — not scored | ||
| Size | 1.9 GB | 10 MB |
| Age rating | 17+ | 4+ |
| Developer | Masahiko Hattori | Tomonori Kowatari |
In-app purchases
Human Factor
No in-app purchases
AcoustioNary
- Remove ads forever$1.99
- 応援チップ(小)$1.99
- 応援チップ(中)$4.99
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- 応援チップ(大)$9.99









