P21

🇺🇸 United States
CAVES BOOKS LTD.  | 
26
ASO score
Text
2/100
Reviews
50/100
Graphic
60/100
Other
0/100
rating
App Rating
2.9
rating
Votes
50
rating
App Age
6y 9m
rating
Last Update
Nov 02, 2025
rating
iAP
JPY120 - 980

Compare with Category Top Apps

Metrics
Current App
Category Top Average
Difference
Rating
2.92
4.59
-36%
Number of Ratings (Voted)
50
1M
-100%
App Age
6y 8m
7y 11m
-15%
In-app Purchases Price
$0
$53
Update Frequency
40d
19d
+105%
Title Length
3
27
-89%
Subtitle Length
0
28
Description Length
689
3 025
-77%
Number of Screenshots
1872
1298
+44 %
Size
226MB
239MB
-6 %

Category Ranking in United States

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Top Dec 06, 2025 Dec 13, 2025
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Ranking Keywords in United States

Keywords App Rank
Illustration
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Text ASO

Title (
Characters: 3 of 30
)
P21
Subtitle (
Characters: 0 of 30
)
Description (
Characters: 689 of 4000
)
P21 is a four-level phonics series for young learners. With the P21 App, you can listen to audio tracks from the P21 student books, watch videos in each unit, review keywords with flashcards, and play interesting phonics games. It contains all of the resources you need when learning phonics using the P21 series. Through the P21 series, children are able to build solid foundations in phonological awareness, oral language, phonics, reading, and spelling. The Alphabet, Short Vowels and Special Letters, Long Vowels and Blends, and Controlled Vowels and Digraphs are covered in the series. With P21 and the P21 App, your 21st century kids will become experts in the sounds of English.}
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Visual ASO

Screenshots

Rating & Reviews

Reviews Overview
🧐 Coming Soon…
Rating
2.9
50 voters

Some Latest Reviews

kennu_ku
10 Nov, 2025
4
IOS system P21 audio It's very difficult to stretch the timeline of sound. Please help improve this,
p21savy
06 Jun, 2020
3
1. Game 1: For some words, there is no corresponding bubbles. And no speaker icon is shown to repeat the word. 2. Song: The track number is not in order.

Other

Additional Information
Rating:
2.93
Voted: 50
App Store Link:
Website: -
Email: -
Privacy Policy:
Categories: Education
Size: 225MB
iAP: 120 - 980 JPY
App Age: 6 years 9 months
Release Date: Mar 22, 2019
Last Update: Nov 02, 2025
Version: 1.47
Version history
1.47
Nov 02, 2025
bug fix
1.46
Nov 26, 2024
bug fix
Version history