Knock, knock, knock! vs Shelf
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Knock, knock, knock!
This interactive book app brings a classic children's story to life with engaging page-turning and the ability to record your own narration. It's designed for young children to enjoy a beloved tale in a new digital format.
- Interactive page turning
- Recordable narration
- Multiple language options
- Classic children's story
- Designed for toddlers
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The book Knock, knock, knock! is one of the best selling children's books in Sweden. In this app we've adapted a classic book for small children. – Choose language by pressing the icon in the upper left corner. - Turn page by tapping on the doors (three times for big doors, one time for small doors) or by swiping to the next page. – You can also record your own reading of the book!Press the microphone in the upper left corner and follow the instructions. Suitable for children from 1 year. Illustrations and text: Anna-Clara Tidholm Publisher: Alfabeta Bokförlag AB Produced by: Nekomata Games/5Monkeys
Shelf
Access your personal library of purchased audiobooks and e-books. Read or listen anywhere, anytime, with or without an internet connection. Enjoy your collection without subscriptions or time limits.
- Access purchased audiobooks and e-books
- Read or listen offline
- No subscriptions or time limits
- Bookmark and comment
- Customize reading experience
- Adjust playback speed
- Sleep timer for audiobooks
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Med Shelfappen får du enkelt tillgång till ditt alldeles egna bibliotek, fyllt med alla ljud- och e-böcker som du har köpt via ditt personliga konto. Det innebär att du helt fritt kan läsa eller lyssna på dina böcker var som helst, när som helst, med eller utan internetuppkoppling. Säg hejdå till stressiga abonnemang och hej till din egna samling böcker som du valt ut och vill läsa eller lyssna på. Med vår app kan du dessutom ta god tid på dig och njuta av läsupplevelsen utan att vara orolig över att överskrida någon typ av tidsbegränsning. Vi har ljudböcker och e-böcker för alla smaker, både nyheter och gamla klassiker. Välj och vraka bland bästsäljare, deckare, feel-good och inspirerande biografier. Du hittar enkelt din nästa läsupplevelse genom att ta hjälp av våra tips och topplistor. Logga in på ditt vanliga Adlibris-konto så synkroniseras alla dina tidigare köpta e-böcker och ljudböcker direkt till appen. Saknar du ett konto kan du enkelt skapa ett direkt på vår hemsida. I Shelf-appen kan du: - Läsa e-böcker - Lyssna på ljudböcker - Lyssna eller läsa i offline-läge - Lägga in egna bokmärken och kommentarer - Anpassa din läsupplevelse genom att välja textstorlek, typsnitt och bakgrundsfärg - Anpassa uppläsningshastigheten från 0.5 till 3.0 gånger hastigheten - Ställa in sovtimer för att pausa din ljudbok Mejla oss gärna om du har några idéer, synpunkter eller problem. Du når oss på shelf@beat.no. Trevlig läsning!
Screenshots
Verdict
The clearest difference is price: Shelf at Free against Knock, knock, knock!'s $2.99. Shelf also leads on update cadence (every 5 weeks vs every 48 months). Knock, knock, knock!'s advantage is iOS requirement (9.3 vs 15.0). On 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
Shelf is free to download; Knock, knock, knock! costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Knock, knock, knock! ships an update every 48 months, Shelf every 5 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | Knock, knock, knock! | Shelf |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | — | 4.7 (7 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | — | 7 — better |
| Update frequency | Every 48 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Ad-supported — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.3 — better | 15.0 |
| Further details — not scored | ||
| Size | 121 MB | 40 MB |
| Age rating | 4+ | 12+ |
| Developer | Alfabeta | Beat Technology AS |
Customer experience
Knock, knock, knock!
Shelf
In-app purchases
Knock, knock, knock!
No in-app purchases
Shelf
No in-app purchases
