Comparison

O'Reilly vs AZ

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

AZ

Features
Read full description

PASS YOUR WINDOWS SERVER HYBRID ADVANCED SERVICES EXAM 500+ practice questions 5-minute study sessions Track progress and daily streaks 94% first-attempt pass rate WHY GET CERTIFIED? Certified Windows Server administrators earn up to $203K annually (Skillsoft 2024). Microsoft AZ-801 validates advanced expertise in securing, managing high availability, and migrating Windows Server workloads. WHAT YOU'LL MASTER: Windows Server security with Defender, BitLocker, and LAPS High availability with failover clustering and Storage Spaces Direct Disaster recovery using Azure Site Recovery and Hyper-V replicas Server and workload migration to Azure with Azure Migrate Monitoring and troubleshooting with Windows Admin Center and Azure Monitor STUDY ANYWHERE: Coffee breaks. Commutes. Lunch hours. Turn dead time into advanced Windows Server expertise. Download now. Pass your exam. Master advanced hybrid services.

Screenshots

O'Reilly4 screens
AZ3 screens

Verdict

The call

The clearest difference is update cadence: O'Reilly at fortnightly against AZ's every 2 months. AZ'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

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

O'Reilly ships an update fortnightly, AZ every 2 months. The most recent releases landed on October 20, 2026 and October 6, 2026 respectively.

Scorecard2 real differences · 8 level
O'Reilly versus AZ: the parameters behind the verdict, then further details
ParameterO'ReillyAZ
PriceFreeFree
Rating4.7 (34K ratings) — better—
Positive reviews46.0% of reviews—
Number of ratings34K — better—
Update frequencyFortnightly — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationSubscription—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.515.0 — better
Further details — not scored
Size64 MB31 MB
Age rating4+4+
DeveloperO'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

AZ

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

O'Reilly

No in-app purchases

None

AZ

No in-app purchases

Questions

Is O'Reilly free?
O'Reilly is free to download, with no in-app purchases.
Is AZ free?
AZ is free to download, with no in-app purchases.
Do O'Reilly or AZ have ads?
Neither O'Reilly nor AZ shows ads.
Which is updated more often, O'Reilly or AZ?
O'Reilly ships an update fortnightly, and AZ every 2 months. Most recently, O'Reilly was updated on October 20, 2026 and AZ on October 6, 2026.

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