Comparison

ReadingRookie vs TheLostKOSM

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

Head to head

About

ReadingRookie

Features

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Reading Rookie is a three-level reading series for language and content integrated learning. It is designed to elevate young learners’ enthusiasm in reading interesting and inspiring passages on a variety of topics, which enhance students’ joy of reading, academic knowledge, and future vision. Each reading passage is supported by a set of reading activities to help students’ logical understanding of the texts and develop their critical and comprehensive reading skills.

About

TheLostKOSM

Features

Read full description

과학관에 구비된 많은 정보와 관람물들을 보다 자세히 관찰하고, 재미있게 학습할 수 있도록, 과학관 내부 전시물을 활용해서 퀴즈를 푸는 앱입니다.

Screenshots

ReadingRookie4 screens

TheLostKOSM4 screens

Verdict

The call

The clearest difference is update cadence: TheLostKOSM at weekly against ReadingRookie's every 6 months. ReadingRookie's advantage is iOS requirement (12.2 vs 15.6). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

ReadingRookie ships an update every 6 months, TheLostKOSM weekly. The most recent releases landed on December 15, 2025 and October 24, 2026 respectively.

Scorecard2 real differences · 4 level

ReadingRookie versus TheLostKOSM: the parameters behind the verdict, then further details
Parameter	ReadingRookie	TheLostKOSM
Price	Free	Free
Update frequency	Every 6 months	Weekly — better
Ads	No	No
In-app purchases	No	No
Devices	iPhone, iPod	iPhone, iPad, iPod — better
Requires iOS	12.2 — better	15.6
Further details — not scored
Size	1 MB	173 MB
Age rating	4+	4+
Developer	Epublic CO.,LTD	Korea National Ocean Science Museum

In-app purchases

None

ReadingRookie

No in-app purchases

None

TheLostKOSM

No in-app purchases

Questions

Is ReadingRookie free?

ReadingRookie is free to download, with no in-app purchases.

Is TheLostKOSM free?

TheLostKOSM is free to download, with no in-app purchases.

Do ReadingRookie or TheLostKOSM have ads?

Neither ReadingRookie nor TheLostKOSM shows ads.

Which is updated more often, ReadingRookie or TheLostKOSM?

ReadingRookie ships an update every 6 months, and TheLostKOSM weekly. Most recently, ReadingRookie was updated on December 15, 2025 and TheLostKOSM on October 24, 2026.