Comparison

Human Factor vs AcoustioNary

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

Head to head
About

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。

About

AcoustioNary

Features
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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

AcoustioNary4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. AcoustioNary sells 4 one-off in-app purchases. Human Factor asks for nothing beyond the download.

Scorecard2 real differences · 4 level
Human Factor versus AcoustioNary: the parameters behind the verdict, then further details
ParameterHuman FactorAcoustioNary
PriceFreeFree
Update frequency—Every 2 days
Ads—No
In-app purchasesNo — betterYes
Devices—iPhone — better
Requires iOS26.217.0 — better
Further details — not scored
Size1.9 GB10 MB
Age rating17+4+
DeveloperMasahiko HattoriTomonori Kowatari

In-app purchases

None

Human Factor

No in-app purchases

4 purchases

AcoustioNary

One-time4
  • Remove ads forever$1.99
  • 応援チップ(小)$1.99
  • 応援チップ(中)$4.99
Show 1 more
  • 応援チップ(大)$9.99

Questions

Is Human Factor free?
Human Factor is free to download, with no in-app purchases.
Is AcoustioNary free?
AcoustioNary is free to download, with in-app purchases available.

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