Comparison

P21 vs Sentopoly

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

Head to head
About

P21

This educational app supports a four-level phonics series for young learners. It offers audio tracks, videos, flashcards, and games to help children build foundational skills in phonological awareness, reading, and spelling.

Highlights
  • Audio tracks from student books
  • Educational videos
  • Keyword flashcards
  • Phonics games
  • Progress tracking
Features
Read full description

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.

About

Sentopoly

Features
Read full description

Sentopoly: learn a language from the sentences you actually need. SEVENTEEN LANGUAGES Learn Arabic, Chinese (Simplified), Chinese (Traditional, Taiwan), Dutch, English, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Portuguese, Russian, Spanish, Turkish or Vietnamese, starting from any of the others. Choose the language you speak and the one you want, and change pairs whenever you like. TYPE OR SAY A SENTENCE In your language or the one you are learning. Sentopoly translates it the way a native speaker would say it and breaks it into words: meaning, part of speech, pronunciation and a note on usage. Chinese comes with Zhuyin or pinyin, Japanese with furigana and romaji, Korean, Russian, Arabic and Hindi with romanisation, and the European languages with IPA. HEAR IT PROPERLY Every sentence and every word is read in a natural native voice, in all 17 languages. Listen mode plays your sentences one after another, with the screen off if you like, with shuffle and a pause after each one so you can repeat it. SAY IT, GET SCORED Shadow mode plays the sentence, records you repeating it, and scores your pronunciation word by word. Words you got wrong turn red; tap one to hear it again. Scoring covers 15 of the 17 languages; for Indonesian and Turkish you can still record yourself and compare. REMEMBER IT Sentences and words go into a five-stage spaced-repetition schedule. A few minutes a day keeps everything you have learned alive. A daily goal and a streak keep you honest, a day with nothing due never breaks your streak, and Hard ones drills the cards you keep missing. START WITH A TOOLKIT Learning Taiwan Mandarin? A built-in starter pack gives you 250 everyday sentences in ten units: asking questions, people and things, numbers and money, time, dates, measurements, directions, past and future, can / want / need, feelings. Starter packs for the other languages, each adapted to the country where the language is spoken, arrive in the next update. YOUR LIBRARY Tag sentences, search them, filter yours from the course. The app's own interface is in English or Traditional Chinese. PRIVATE BY DESIGN No account. Your sentences live on your phone and in your own iCloud backup. No ads, no tracking. SENTOPOLY PRO Try everything free for 7 days. Pro unlocks unlimited new sentences, voices and pronunciation scoring: US$4.99 a month or US$29.99 a year. Cancel any time; everything you saved stays yours. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://sentopoly-proxy.khazaril-1df.workers.dev/privacy

Screenshots

P214 screens
Sentopoly4 screens

Verdict

The call

The clearest difference is in-app purchases: P21 at none against Sentopoly's 2. P21 also leads on iOS requirement (11.0 vs 16.4). Sentopoly's advantage is update cadence (every 3 days vs every 6 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. Sentopoly sells 2 in-app purchases, starting at $4.99 per month. P21 asks for nothing beyond the download.

UpkeepUpdate frequency

P21 ships an update every 6 weeks, Sentopoly every 3 days. The most recent releases landed on November 2, 2026 and November 6, 2026 respectively.

Scorecard3 real differences · 6 level
P21 versus Sentopoly: the parameters behind the verdict, then further details
ParameterP21Sentopoly
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 6 weeksEvery 3 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS11.0 — better16.4
Further details — not scored
Size226 MB104 MB
Age rating4+4+
DeveloperCAVES BOOKS LTD.Ian Jukes

In-app purchases

None

P21

No in-app purchases

2 purchases

Sentopoly

Subscriptions2
  • Sentopoly Pro, monthly7 Days trial$4.991 Month
  • Sentopoly Pro, yearly7 Days trial$29.991 Year

Questions

Is P21 free?
P21 is free to download, with no in-app purchases.
Is Sentopoly free?
Sentopoly is free to download, with in-app purchases available.
Do P21 or Sentopoly have ads?
Neither P21 nor Sentopoly shows ads.
Which is updated more often, P21 or Sentopoly?
P21 ships an update every 6 weeks, and Sentopoly every 3 days. Most recently, P21 was updated on November 2, 2026 and Sentopoly on November 6, 2026.

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