Comparison

Reading Memory vs BookDiary

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

Head to head
About

Reading Memory

This app helps you record and deepen your reading experience through chat-based notes and AI interactions. It allows you to track reading goals, analyze habits, and revisit your thoughts on books.

Highlights
  • AI-powered chat memos
  • Mood tagging for emotional depth
  • Card-swipe review format
  • Smart book search and barcode scanning
  • Reading goal setting and habit tracking
  • AI summaries of chat memos
  • Reading statistics and analysis
  • Achievements and reading milestones
Features
Read full description

A quiet reading journal that keeps every book and how it felt. Open a book again, and the notes you wrote before come back as letters. You read many books, but you forget what was in them and what you felt. When you reread, you wonder what you were thinking the first time. Reading Memory is for that. No social feed, no followers, no public reviews. Just you and the book. PAST NOTES COME BACK AS LETTERS Each book shows the notes you've written as letters, grouped by date. Notes you haven't revisited arrive as letters to read one at a time, and you can add a line from who you are now. Mark how they feel today: "I remember," "This still hits," "I had forgotten," and more. NOTES IN ONE LINE, LIKE A CHAT Capture thoughts, quotes, and impressions as you read, in a chat-like flow. No character limits. Nobody else sees them. MOOD TAGS Eight moods for finished books and notes: moved, excited, thought-provoking, comforting, challenging, bittersweet, fun, and shocking. BOOKSHELF Your books line up by their covers. Grid and list views. Organize books as want to read, reading, finished, or on the pile. BOOK SEARCH & BARCODE Add books by title search or by scanning the barcode. Book data comes from Google Books, openBD, and Rakuten Books. "READ TODAY" FOR EACH BOOK One tap on the book you read today. You can see which book you read on which day, and your streak grows. You can also record it from the Home Screen and Lock Screen widgets. WANT-TO-READ LIST Set priorities, planned reading dates, and purchase links for books you want to read. READING CALENDAR & BADGES See the days you read on a calendar, with your streak and finished books. Earn badges at milestones (82 in total). — MEMORY PLUS (Premium) Notes, letters, the bookshelf, and "read today" are free. The free plan holds up to 10 books. Premium adds: ◆ Unlimited books ◆ AI Chat Notes: AI replies to your chat notes with questions, using what you wrote about that book ◆ AI Summary: summarizes the notes you wrote for a book ◆ Detailed statistics: genre distribution, mood analysis, calendar heatmap, and more Pricing: $3.99 per month / $39.99 per year in the US (prices vary by region). Auto-renewable subscription. Payment is charged to your Apple ID at confirmation of purchase. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel it in Settings › Apple Account › Subscriptions. Terms of Use (EULA): https://taniguchi-kyoichi.com/products/reading-memory/terms Privacy Policy: https://taniguchi-kyoichi.com/products/reading-memory/privacy — Made by an independent developer. No ads. Feedback and bug reports: use the "Feedback" button in the app.

About

BookDiary

A private reading journal to track your books, quotes, and reading habits without requiring an account or social sharing. Log your progress, save memorable passages, and discover new reads all on your device.

Highlights
  • Private reading journal
  • Save quotes from pages
  • Reading progress tracking
  • Digital book shelf
  • Reading calendar
  • Personal reading awards
  • Draw from TBR pile
Read full description

A private reading journal for readers who’d rather not share. Snap a page to save the line that stayed with you, watch your reading days quietly fill a calendar, and keep every book on a shelf that’s yours alone. No accounts. No social feed. ◆ FEATURES Five tabs: Shelf, Reading, To Read, Quotes and Records Read from a photo: snap a page and the text becomes your quote. Snap the cover to fill in title and author. Text recognition runs on your device. Reading calendar: days you added a book, logged a page, or saved a quote are marked Monthly wrap: books finished, pages, reading days and a line from the month, on one card A line for today: one of your saved quotes as a notification at the time you choose (optional) First reads and rereads logged separately, so you can see how a book changes with you Quote cards: save or share a passage as a washi-paper image Reading progress: log today’s page and watch the bar fill Personal reading awards: book of the year, most moving, most reread and more Draw a book: can’t decide what’s next? Draw one from your TBR pile Beautiful covers without photos: nine genres, each with its own washi-paper design. Using a photo? Pinch and drag to fit it to the frame. ◆ WHO IT’S FOR Readers who want to read without other people’s ratings Commonplace-book keepers moving from paper to phone Rereaders who return to favorite books over the years Anyone with a tall TBR pile Lovers of dark academia and quiet design People who avoid apps that require an account ◆ PRIVACY No account required Your books, quotes and notes are stored on your device only and never sent to a server Photo text recognition happens on-device No barcode lookups or external book services No tracking, no analytics on your reading To introduce our other apps, the app may load public App Store information (app names and icons). Your records are never sent. ◆ PRICING, PLAINLY BookDiary is free to use. The free version includes: Up to 50 books Up to 3 quotes per book and 3 photos per reading log 2 personal award categories Up to 5 entries per My Data category 5 photo text scans Washi quote cards in square format Reading calendar for the current month; monthly wrap viewable in the app The Sumi shelf theme in cover view Introductions to our other apps

Screenshots

Reading Memory4 screens
BookDiary4 screens

Verdict

The call

The clearest difference is update cadence: BookDiary at every 2 weeks against Reading Memory's every 3 months. On price, review sentiment, ads and in-app purchases 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. Reading Memory sells 2 in-app purchases, starting at $3.99 per month and BookDiary sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Reading Memory ships an update every 3 months, BookDiary every 2 weeks. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

Scorecard1 real difference · 9 level
Reading Memory versus BookDiary: the parameters behind the verdict, then further details
ParameterReading MemoryBookDiary
PriceFreeFree
Rating—4.0 (1 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhoneiPhone, iPad — better
Requires iOS17.017.0
Further details — not scored
Size32 MB3 MB
Age rating4+4+
DeveloperKyoichi Taniguchitorankirite

Customer experience

Reading Memory

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

BookDiary

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

Reading Memory

Subscriptions2
  • メモリープラス月額プラン$3.991 Month
  • メモリープラス年額プラン1 Month trial$39.991 Year
1 purchases

BookDiary

One-time1
  • Premium$3.99

Questions

Is Reading Memory free?
Reading Memory is free to download, with in-app purchases available.
Is BookDiary free?
BookDiary is free to download, with in-app purchases available.
Do Reading Memory or BookDiary have ads?
Neither Reading Memory nor BookDiary shows ads.
Which is updated more often, Reading Memory or BookDiary?
Reading Memory ships an update every 3 months, and BookDiary every 2 weeks. Most recently, Reading Memory was updated on October 28, 2026 and BookDiary on October 25, 2026.

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