英単語9000 vs CheckBoostAudio
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
英単語9000
This app helps users efficiently memorize vocabulary by focusing on words they are likely to forget. It utilizes a spaced repetition system based on the forgetting curve to reinforce learning and improve retention.
- 9000 vocabulary words included
- Focuses on weak words based on forgetting curve
- Push notifications for difficult words
- Memory strength assessment
- Efficient learning with occasional study sessions
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■９０００語収録で初心者から上級者まで学習可能！ ■忘却曲線に基づき記憶が弱い単語を集中して出題！ ■プッシュ通知で苦手な単語をお知らせ！ 毎日勉強するのは大変かつ一度覚えてもまたすぐに忘れてしまいます。そんな記憶に注目して、忘れる前にもう一度学習することで記憶の定着をサポートするアプリの登場です！ 学習回数を重ねるにつれて「記憶度」を判定し、苦手な単語に集中して学習できます。 短時間に学習しても記憶は定着しにくいので効率できではありません。このアプリでは時間とともに忘れていく記憶を再現しながら学習するため、毎日学習する必要はなく、「たまに」学習することでより効率的に、手軽に記憶を定着させることが可能です！ 日々改良を重ねていますのでお気軽に改善要望をお寄せください！
CheckBoostAudio
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Take your listening experience to the next level with this simple and intuitive audio player designed for language learners! With powerful features to help you manage tracks for repeated listening and focused practice, it’s your perfect companion for efficient learning. # Key Features - Track Check Feature Mark the parts you couldn’t catch with a simple check. Instantly identify which tracks need more attention for smoother and smarter review. - Waveform Display for Precise Control Visualize your audio with a sleek waveform display! Easily pinpoint the exact moment you want to rewind or fast-forward to—perfect for detailed practice. - Checked Tracks Page Easily access all your checked tracks on the Checked Tracks page! Revisit and focus on the parts you struggled with or the sections you want to master. Designed for language learners, musicians, and anyone who loves music, this player enhances your listening habits, whether for study, practice, or leisure. Download now and start building better listening habits today!
Screenshots
Verdict
The clearest difference is update cadence: CheckBoostAudio at every 3 days against 英単語9000's every 22 months. On price, ads, 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. Neither carries in-app purchases, so what you see is what you pay.
英単語9000 ships an update every 22 months, CheckBoostAudio every 3 days. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | 英単語9000 | CheckBoostAudio |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 22 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 29 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | Kenta Shimomura | Masatomo Fukuda |
In-app purchases
英単語9000
No in-app purchases
CheckBoostAudio
No in-app purchases
Questions
Is 英単語9000 free?
Is CheckBoostAudio free?
Do 英単語9000 or CheckBoostAudio have ads?
Which is updated more often, 英単語9000 or CheckBoostAudio?
Other comparisons
