Comparison

Read Rocket vs Codex Books

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

Head to head
About

Read Rocket

Enhance reading speed and focus with three science-backed modes: Flash, Scroll, and Speak. Import documents from various formats and sync across Apple devices. Enjoy a private, ad-free experience with a one-time purchase.

Highlights
  • Flash Mode for word-by-word reading
  • Scroll Mode with guided highlight
  • AI Speak Mode with synchronized highlight
  • Import PDFs, EPUBs, web articles, and more
  • Cross-device syncing (iPhone, iPad, Mac)
  • On-device processing for privacy
  • One-time purchase, no subscriptions
Features
Read full description

Read Rocket gives you three powerful, science-backed ways to read faster and stay focused — whether you're powering through textbooks, catching up on articles, or flying through your reading list. THREE WAYS TO READ Flash Mode displays one word at a time at a fixed focal point, eliminating the eye movements that account for most of your reading time. Set your own pace and watch your speed climb. Scroll Mode adds a guided highlight that moves through your document at a steady rhythm, keeping your attention locked and preventing the backtracking that slows you down. Speak Mode pairs high-quality AI text-to-speech with a synchronized visual highlight, engaging both your eyes and ears for stronger comprehension and retention. IMPORT ALMOST ANYTHING Bring in PDFs, EPUBs, Word documents, web articles, plain text, Markdown, HTML, RTF, OpenDocument files, and more — Read Rocket strips away the clutter so you can focus on what matters. Save articles straight from Safari or any app using your device's share menu, and they're instantly ready to read. YOUR LIBRARY, YOUR WAY Start reading on your iPhone, pick up right where you left off on your Mac or iPad. Your progress syncs automatically. Export your library to take your files where you need them. BUILT FOR APPLE Read Rocket is a native app designed for iPhone, iPad, and Mac. It supports widgets for quick access to your reading list, a share extension for effortless importing, and all the system features you expect from a great Apple app. PRIVACY FIRST Read Rocket processes everything on your device. Your documents never leave your hands. No accounts, no tracking, no ads. AI VOICES THAT SOUND NATURAL Speak Mode includes Kokoro AI voices that run entirely on your device — no internet connection needed, no data sent anywhere. Choose from American and British English accents, or use any of Apple's built-in system voices. SIMPLE, FAIR PRICING Try Read Rocket free for 7 days. Then it's just $8.99 — one time, forever yours, on all your Apple devices. No subscriptions. No recurring charges. No upsells.

About

Codex Books

Features
Read full description

Codex helps you build and organize a personal book library from the books around you. Scan a book cover with your camera, pick a photo from your library, scan an ISBN barcode, or search by title, author, or ISBN. Codex retrieves book details such as title, author, year, cover, description, and ISBN, then saves them into your library for quick browsing and lookup. Your collection can be sorted by author, year, or category, and books can be grouped into genres and adjusted manually when needed. You can also export your full library as JSON for backup or sharing. Features: - Scan book covers with OCR-based search - Scan ISBN barcodes with the camera - Search manually by title, author, or ISBN - Save title, author, year, category, description, cover, and ISBN - Organize books by author, year, and category - Edit categories and remove books from the library - Export your collection as JSON - Sync your library through iCloud - Codex is designed for readers who want a fast way to catalog physical books without maintaining a spreadsheet by hand.Note:In order to function, the app needs Google API with Books API access which can be configured via the app settings.

Screenshots

Read Rocket4 screens
Codex Books4 screens

Verdict

The call

The clearest difference is update cadence: Codex Books at every 3 days against Read Rocket's every 3 weeks. On price, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Read Rocket sells 1 one-off in-app purchase and Codex Books sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Read Rocket ships an update every 3 weeks, Codex Books every 3 days. Both last shipped on October 31, 2026.

Scorecard1 real difference · 9 level
Read Rocket versus Codex Books: the parameters behind the verdict, then further details
ParameterRead RocketCodex Books
PriceFreeFree
Rating5.0 (3 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 3 weeksEvery 3 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS18.018.0
Further details — not scored
Size383 MB6 MB
Age rating4+4+
DeveloperJOSEPH CLAYTON KLEINShinro OU

In-app purchases

1 purchases

Read Rocket

One-time1
  • Unlock Read Rocket$8.99
1 purchases

Codex Books

One-time1
  • Unlimited Library (Lifetime)$5.99

Questions

Is Read Rocket free?
Read Rocket is free to download, with in-app purchases available.
Is Codex Books free?
Codex Books is free to download, with in-app purchases available.
Do Read Rocket or Codex Books have ads?
Neither Read Rocket nor Codex Books shows ads.
Which is updated more often, Read Rocket or Codex Books?
Read Rocket ships an update every 3 weeks, and Codex Books every 3 days. Most recently, Read Rocket was updated on October 31, 2026 and Codex Books on October 31, 2026.

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