Comparison

Plain850:核心英文 850詞 vs Kay Ogden

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

Head to head
About

Plain850:核心英文 850詞

Features
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Plain850 是一個專注於 850 個核心英文詞的簡潔學習工具。 它不是要你背更多、更難的單字,而是幫你把最常見、最基礎、最容易用錯的英文詞重新學穩。 很多英文學習者其實已經認識不少單字,但在真正閱讀、寫作或表達時,仍然會卡在 make、do、get、take、have、in、on、with 這類核心詞的用法。Plain850 的目標,就是讓你用更安靜、更清晰的方式,回到英文的基礎。 主要功能: ・學習 850 個核心英文詞 ・透過「850 單字書」將學習進度視覺化 ・按分類瀏覽單字 ・查看中文、日文、西班牙文說明 ・閱讀簡單 A2 英文文化文章 ・閱讀時可點按單字查看解釋 ・收藏想重溫的單字 ・使用測驗模式檢查記憶 ・支援英文發音 ・無需登入 ・可離線使用 ・免費使用,沒有廣告 Plain850 適合: ・想重新打好英文基礎的人 ・認識很多單字,但核心詞用得不穩的人 ・正在學英文的中文、日文或西班牙文使用者 ・想用碎片時間安靜複習英文的人 ・不喜歡複雜介面、廣告或過度遊戲化學習工具的人 Plain850 的設計理念很簡單: 不是背更多字,而是先把最重要的字學深。 從 850 個核心詞開始,慢慢建立更穩定的英文基礎。

About

Kay Ogden

Features
Read full description

Kay Ogden helps you learn English with Ogden Basic English — the practical 850-word core and the 1368-word library. British and American audio is now built into the app. Tap any word, definition, or example and hear it immediately, even on a plane or a subway. New Concept English Book 1 audio is included; Books 2–4 can be downloaded when you need them. Study with flashcards, IPA pronunciation, phrases, stories, daily review, and New Concept lessons. When you need help writing a sentence, AI writing assistance is there. Kay Ogden is the focused native iOS edition for learners who want a calm, classic vocabulary routine — offline first. Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Plain850:核心英文 850詞4 screens
Kay Ogden4 screens

Verdict

The call

The clearest difference is in-app purchases: Plain850:核心英文 850詞 at none against Kay Ogden's 2. Plain850:核心英文 850詞 also leads on iOS requirement (13.0 vs 15.0). Kay Ogden's advantage is update cadence (every 2 days vs every 2 weeks). On price, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Kay Ogden sells 2 in-app purchases, starting at $0.99 per month. Plain850:核心英文 850詞 asks for nothing beyond the download.

UpkeepUpdate frequency

Plain850:核心英文 850詞 ships an update every 2 weeks, Kay Ogden every 2 days. The most recent releases landed on September 9, 2026 and September 8, 2026 respectively.

Scorecard3 real differences · 3 level
Plain850:核心英文 850詞 versus Kay Ogden: the parameters behind the verdict, then further details
ParameterPlain850:核心英文 850詞Kay Ogden
PriceFreeFree
Update frequencyEvery 2 weeksEvery 2 days — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size43 MB804 MB
Age rating4+4+
DeveloperLok Wai小琦 王

In-app purchases

None

Plain850:核心英文 850詞

No in-app purchases

2 purchases

Kay Ogden

Subscriptions2
  • AI Writing Monthly$0.991 Month
  • Kay Support$1.991 Month

Questions

Is Plain850:核心英文 850詞 free?
Plain850:核心英文 850詞 is free to download, with no in-app purchases.
Is Kay Ogden free?
Kay Ogden is free to download, with in-app purchases available.
Do Plain850:核心英文 850詞 or Kay Ogden have ads?
Neither Plain850:核心英文 850詞 nor Kay Ogden shows ads.
Which is updated more often, Plain850:核心英文 850詞 or Kay Ogden?
Plain850:核心英文 850詞 ships an update every 2 weeks, and Kay Ogden every 2 days. Most recently, Plain850:核心英文 850詞 was updated on September 9, 2026 and Kay Ogden on September 8, 2026.

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