Delta单词 vs Onsei
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Delta单词
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世界语言，装进口袋 5大洲、10+语系、60+语言、100+词书 纯粹背词，回归简单 背单词最重要的当然是优雅 Polyglot就是你！ 彝语、泰米尔语、尤卡坦玛雅语一网打尽 多词书模式 同时背多个语言是别样的快乐 大千世界，我想看看 学习一种语言，就等于获得了第二个灵魂
Onsei
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Onsei is a Japanese learning app designed for focused daily study. Build vocabulary and grammar with spaced repetition, clear review flows, native audio, and scenario-based practice that helps you turn study into real usage. Features: • Vocabulary and grammar review • Spaced repetition scheduling • Daily study sessions and progress tracking • Japanese audio playback • Optional account sync across devices • Scenario-based practice for everyday situations
Screenshots
Verdict
The clearest difference is update cadence: Delta单词 at daily against Onsei's every 10 days. 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.
Delta单词 ships an update daily, Onsei every 10 days. The most recent releases landed on September 8, 2026 and September 4, 2026 respectively.
| Parameter | Delta单词 | Onsei |
|---|---|---|
| Price | Free | Free |
| Update frequency | Daily — better | Every 10 days |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.1 | 15.1 |
| Further details — not scored | ||
| Size | 180 MB | 33 MB |
| Age rating | 4+ | 12+ |
| Developer | 田丰 何 | 鑫 陈 |
In-app purchases
Delta单词
No in-app purchases
Onsei
No in-app purchases
