O'Reilly vs CertNinja
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 tech books, videos, and courses to build in-demand skills. Stay current with the latest in programming, AI, cloud, and more. Learn on the go with offline downloads and progress syncing.
- Thousands of books, videos, and courses
- Content on programming, AI, cloud, DevOps, cybersecurity
- Audiobooks for multitasking
- Live events and on-demand training
- Playlists for content organization
- Offline downloads and progress syncing
- AI-powered search and overviews
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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.
CertNinja
Prepare for IT certification exams with AI-powered flashcards and study tools. Access thousands of practice questions, instant explanations, and detailed progress tracking for cloud, security, and DevOps professionals.
- Thousands of practice questions
- Instant answer explanations
- AI study tutor
- Progress tracking by domain
- Multiple choice & multi-select questions
- Covers 30+ certifications
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Pass your IT certification exam faster with CertNinja — the smart flashcard app built for cloud, security, and DevOps professionals. Whether you're studying for AWS, Azure, CompTIA, CISSP, or Kubernetes, CertNinja gives you everything you need to build real exam confidence. STUDY SMARTER WITH FLASHCARDS • Thousands of practice questions across 30+ certifications • Multiple choice and multi-select questions — just like the real exam • Instant explanations for every answer, right and wrong • Domain tags and difficulty levels on every card AI STUDY TUTOR • Ask anything about your certification in plain English • Deep explanations of complex concepts like IAM, Zero Trust, or risk frameworks • Available 24/7, no waiting TRACK YOUR PROGRESS • Accuracy stats broken down by exam domain • Daily study streak to keep you consistent • See exactly which areas need the most work CERTIFICATIONS COVERED AWS — Cloud Practitioner, Solutions Architect Associate & Professional, DevOps Engineer, Developer Associate, SysOps Administrator, Security Specialty Azure — AZ-900, AZ-104, AZ-305, AZ-400, AZ-500, SC-200, SC-100 CompTIA — Security+, Network+, CySA+, SecurityX ISC2 — CISSP, CCSP SACA — CISM, CRISC, CISA, CCOA CNCF / HashiCorp — CKA, CKAD, Terraform Google Cloud — Professional Cloud Architect, Professional Cloud Security Engineer GIAC — GCIH FREE VS PRO Free: 10 flashcards per certification to try before you commit Pro: Unlimited flashcards, 100 AI tutor interactions/month, bookmarks, domain analytics Start studying today. Your next certification is within reach. Privacy Policy: https://evolvetech86-bestnext.github.io/bestnext-privacy/certninja/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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Verdict
The clearest difference is review sentiment: CertNinja at 100% against O'Reilly's 46%. CertNinja also leads on rating (5.0 vs 4.7) and update cadence (every 5 days vs fortnightly). O'Reilly's advantage is in-app purchases (none vs 2) and ratings volume (34K vs 1). On price, ads 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. CertNinja sells 2 in-app purchases, starting at $8.99 per month. O'Reilly asks for nothing beyond the download.
CertNinja holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: O'Reilly has 34K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 46% of O'Reilly's written reviews are positive against 100% of CertNinja's.
O'Reilly ships an update fortnightly, CertNinja every 5 days. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.
| Parameter | O'Reilly | CertNinja |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (34K ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 46.5% of reviews | 100.0% of reviews — better |
| Number of ratings | 34K — better | 1 |
| Update frequency | Fortnightly | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.5 | 15.1 — better |
| Further details — not scored | ||
| Size | 65 MB | 55 MB |
| Age rating | 4+ | 4+ |
| Developer | O'Reilly Media, Inc. | Saleh Rafiee |
Customer experience
O'Reilly
CertNinja
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
CertNinja
Not enough reviews yet to summarise bugs or requests.
In-app purchases
O'Reilly
No in-app purchases
CertNinja
- CertNinja Pro$8.991 Month
- CertNinja Pro Annual$59.991 Year









