O'Reilly vs 1Z0
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
O'Reilly
Access a vast library of expert-led books, videos, and courses on business and technology trends. Learn online or offline, sync progress across devices, and personalize your reading experience. Discover and organize content with playlists for easy access.
- Offline access to books, videos, and courses
- Cross-device progress syncing
- Content discovery and playlist creation
- Personalized text display and night mode
- Search across all learning materials
- External keyboard support
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Build the skills you need for the job you have—or the one you want. With the O’Reilly app paired with a membership, you’ll get access to thousands of books, videos, and courses trusted by tech practitioners around the world. Whether you’re a developer, data professional, or technology leader, O’Reilly helps you stay ahead in a rapidly evolving industry. Here are just a few ways you can use the O’Reilly app to learn today’s most critical skills: • Explore the latest in programming, AI, cloud, DevOps, and cybersecurity, with content from the people actually putting the technology to work—plus in-depth content on leadership, soft skills, and much more. • Discover best-selling titles and early releases from leading publishers, all in one digital library built for technology professionals. • Listen to thousands of audiobooks to keep the learning going while you multitask. • Watch live events and training sessions, or dive into 5,000+ courses on-demand. • Use playlists to save and organize content you’re exploring, and share them with your friends and coworkers. • Learn on the go, anywhere, with downloadable content and progress syncing across devices. • Quickly find the resources that will help you solve the problems you encounter in your day-to-day work with AI-powered search, plus AI overviews (with citations) to get up to speed on the basics. Powerful tools to support your learning: • Recommendations based on your interests and history • Playlists to organize the content you want to learn • Deep search to find answers fast across 75K+ titles, 3.7K+ audiobooks, 30K+ hours of video, and much more • Highlights and notes to capture key ideas • Adjustable reading settings including font size and night mode • Playback speed controls for faster learning Get started with one of our most popular skills: • AI and machine learning • Software development and programming • Data engineering and data science • Cloud, DevOps, and infrastructure • Cybersecurity • Product management and leadership The O’Reilly app works best with a membership. Learn more at oreilly.com.
1Z0
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PASS YOUR ORACLE CERTIFIED PROFESSIONAL: JAVA SE 17 DEVELOPER EXAM Master Java SE 17 with 500+ practice questions designed to help you earn your OCP certification on the first attempt. 500+ practice questions 5-minute study sessions Track your progress Remove mastered questions Text-to-speech support Dark mode available WHY GET CERTIFIED? Oracle Certified Professional: Java SE 17 Developer professionals earn up to $203K annually. This elite Oracle credential validates your expertise and sets you apart in the competitive software development job market. WHAT YOU'LL MASTER: • Primitive Types, Wrapper Classes and Autoboxing • String, StringBuilder and Text Blocks • Date-Time API including LocalDate, LocalTime, ZonedDateTime, Period and Duration • Controlling Program Flow with Switch Expressions, Loops and Pattern Matching • Java Object-Oriented Approach including Constructors, Inheritance and Polymorphism • Handling Exceptions and Error Recovery • Working with Arrays and Collections • Streams and Lambda Expressions • Java Platform Module System and Packaging • Managing Concurrent Code Execution • Java I/O API and File Handling • Accessing Databases Using JDBC • Implementing Localization for Global Applications • Sealed Classes and Records • Pattern Matching for instanceof • Math API and Numeric Promotion Rules STUDY ANYWHERE: Coffee breaks. Commutes. Lunch hours. Turn dead time into Software Development expertise. Download now. Pass your exam. Master Software Development.
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Verdict
The clearest difference is update cadence: O'Reilly at fortnightly against 1Z0's every 2 months. 1Z0's advantage is iOS requirement (15.0 vs 18.5). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
O'Reilly ships an update fortnightly, 1Z0 every 2 months. The most recent releases landed on October 20, 2026 and October 2, 2026 respectively.
| Parameter | O'Reilly | 1Z0 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (34K ratings) — better | — |
| Positive reviews | 46.0% of reviews | — |
| Number of ratings | 34K — better | — |
| Update frequency | Fortnightly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Subscription | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.5 | 15.0 — better |
| Further details — not scored | ||
| Size | 64 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | O'Reilly Media, Inc. | Davy Raitt |
Bugs and requests
O'Reilly
Reported bugs
4 issues- Frequent crashes and freezes
- Unreliable downloads and offline access
- Login issues and loss of progress
- Inconsistent behavior across updates
Requested features
4 requests- Improved bookmarking and note-taking
- Customizable text formatting and layout
- Better search and content discovery
- Seamless sync across devices
1Z0
Not enough reviews yet to summarise bugs or requests.
In-app purchases
O'Reilly
No in-app purchases
1Z0
No in-app purchases









