Comparison

Yondazo vs HeartShelf

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

Head to head
About

Yondazo

Track your reading progress with detailed charts and insights. Log books, add notes, and visualize your reading journey over time. Offers on-device AI analysis for private habit discovery.

Highlights
  • Monthly, yearly, and all-time reading charts
  • On-device AI reading habit analysis
  • Book notes, ratings, and genre tagging
  • Visual bookshelf with cover grid or list view
  • Barcode scanning for quick book entry
  • Data backup and transfer
Features
Read full description

Yondazo is a reading log app that helps you track every book you finish and reflect on your reading journey from three different angles: monthly totals, year-over-year comparisons, and all-time growth. On Apple Intelligence-compatible devices, you can also get on-device AI insights into your reading habits — fully private, fully local. ■ THREE CHARTS TO VISUALIZE YOUR READING See how much you've read this month with the monthly bar chart, compare this year against last year with the year-over-year view, and watch your reading habit build over time with the cumulative line chart. Switch between the three views to look back on your reading journey from every angle. ■ AI READING INSIGHTS, PROCESSED ON-DEVICE On Apple Intelligence-compatible devices, on-device AI analyzes your reading habits and surfaces patterns you might not have noticed on your own — favorite genres, go-to authors, and your natural reading rhythm. Everything runs locally on your iPhone. Your reading data never leaves the device and is never sent to any server. It's private AI reading analysis — with nothing ever sent to the cloud. * On devices that don't support Apple Intelligence, you can still explore your reading trends through detailed statistics. ■ NOTES, RATINGS & GENRES FOR EVERY BOOK Jot down your thoughts after finishing a book, give it a 5-star rating, and tag it with a genre. Each entry becomes part of your personal reading journal, so you can revisit what you read and how you felt about it. Bookmark your favorites to find them again with a single tap. ■ A BEAUTIFUL BOOKSHELF, ALL YOURS Every book you add appears in a beautiful cover grid — a bookshelf that's entirely yours, ready to browse anytime. Prefer a cleaner view? Switch to list mode with a single tap. ■ ADD BOOKS IN SECONDS WITH BARCODE SCAN Just point your camera at a book's barcode. The title, author, publisher, and cover are added automatically — no tedious typing required. For older titles without a barcode, you can search and add them by title. ■ YOUR DATA, SAFE AND PORTABLE Your reading history matters. That's why Yondazo gives you the tools to keep it safe. • Full backup and restore (JSON format) • Seamless data transfer when you switch devices • Automatic migration from older versions ■ WHO IT'S FOR • Readers who want a simple way to log the books they finish • Anyone curious about how many books they read each month • People who like comparing this year's reading with last year's • Readers who enjoy reflecting on their habits through data • Anyone who wants AI to help them spot patterns in their reading • Readers who like keeping notes and impressions of each book

About

HeartShelf

Features
Read full description

This app lets you create your own bookshelf. Each book can record 15 different emotions, allowing you to look back on them as bookshelves for each emotion. When you want to feel happy, open the "happy" emotion bookshelf, and you'll find a wide selection of books that will make you feel happy.

Screenshots

Yondazo4 screens
HeartShelf4 screens

Verdict

The call

Yondazo and HeartShelf are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both ship on a similar rhythm, roughly every 6 months. The most recent releases landed on October 12, 2026 and October 28, 2026 respectively.

ScorecardNo meaningful differences
Yondazo versus HeartShelf: the parameters behind the verdict, then further details
ParameterYondazoHeartShelf
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 6 monthsEvery 6 months
AdsNoNo
In-app purchasesNoNo
MonetizationAd-supported—
DevicesiPhone, iPad — betteriPhone
Requires iOS18.0 — better18.5
Further details — not scored
Size7 MB24 MB
Age rating4+12+
Developerarakawa yuichiroKEISUKE MAEGAWA

In-app purchases

None

Yondazo

No in-app purchases

None

HeartShelf

No in-app purchases

Questions

Is Yondazo free?
Yondazo is free to download, with no in-app purchases.
Is HeartShelf free?
HeartShelf is free to download, with no in-app purchases.
Do Yondazo or HeartShelf have ads?
Neither Yondazo nor HeartShelf shows ads.
Which is updated more often, Yondazo or HeartShelf?
Yondazo ships an update every 6 months, and HeartShelf every 6 months. Most recently, Yondazo was updated on October 12, 2026 and HeartShelf on October 28, 2026.

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