Lucid Reader vs BookPDF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Lucid Reader
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Lucid Reader — A Streamlined PDF Viewer for Focused Reading Lucid Reader gives you a clean, distraction-free way to read PDFs — whether they're standard documents or books you've scanned yourself. No clutter, no complexity. Just your PDF and you. *** Key Features *** • Two-Page Spread — Read like a real book, with an optional standalone cover page. • Flexible Binding — Switch between right-to-left or left-to-right binding, perfect for Japanese-style books and manga. • Optimized Display — Fine-tune the display area and zoom independently for the left and right pages to maximize space and trim away margins. • Intuitive Page Navigation — Turn pages effortlessly with a tap or a swipe, with customizable tap zones. • Page Lock — Keep your view exactly where you set it and prevent accidental shifts. • Full-Screen Mode — Fully immerse yourself with a distraction-free view. • Collections — Group multiple files together for tidy, organized reading. • iCloud Storage — Offload files to iCloud to reclaim space on your device. *** Effortless File Access *** Open PDFs in seconds: • Tap the + icon in the top-right corner of the file list, or • Choose "Save to Lucid Reader" from the share menu in any other app. *** Secret Mode — Enhanced Privacy (In-App Purchase) *** • Create more collections • Protect your sensitive files with advanced privacy tools: • File Hiding — Swipe right on any file and tap Secret to hide it from the list. • Restricted Access — Hidden files stay concealed until you unlock them with Face ID / Touch ID, keeping them private even if someone glances at your screen. • App Switcher Privacy — Secret-mode PDFs are blurred when switching apps, so your private content stays hidden even on the multitasking screen. • End-to-End Encryption — Encrypt secret files with a password directly on your device. Your files remain unreadable without your password, even if your iCloud storage is accessed. Experience the perfect balance of simplicity and control. Lucid Reader is built for one thing — hassle-free PDF reading.
BookPDF
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このアプリは、PDFを“本のように”快適に読むためのシンプルなリーダーです。 右から左へのページめくり表示に対応し、読書の流れを邪魔しない設計にしてあります。 主な機能 ・右から左へ進むページめくり(読書向け表示) ・しおり(現在ページをワンタップで登録/解除) ・しおり一覧からページへジャンプ ・続きから再開(前回の読書位置を保存) ・PDFの取り込みとライブラリ管理(名前変更・削除) こんな人におすすめ ・PDF小説や資料を“読むために”使いたい ・余計な機能より、見やすさと操作の迷いの少なさを重視したい ※本アプリは、ユーザーが用意したPDFファイルを端末内で閲覧するためのアプリです。
Screenshots
Verdict
The clearest difference is in-app purchases: BookPDF at none against Lucid Reader's 1. BookPDF also leads on update cadence (every 2 days vs fortnightly). On price, ads, device support and iOS requirement 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
Both are free to download. Lucid Reader sells 1 one-off in-app purchase. BookPDF asks for nothing beyond the download.
Lucid Reader ships an update fortnightly, BookPDF every 2 days. The most recent releases landed on September 26, 2026 and September 25, 2026 respectively.
| Parameter | Lucid Reader | BookPDF |
|---|---|---|
| Price | Free | Free |
| Update frequency | Fortnightly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 — better | 18 |
| Further details — not scored | ||
| Size | 4 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Satoshi Takezawa | Yuta Sugawara |
In-app purchases
Lucid Reader
- Pro Mode$0.99
BookPDF
No in-app purchases








