O'Reilly vs HDT Training
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.
HDT Training
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Heavy Duty Transaxle offers self-paced online training built for the off-highway and industrial drivetrain industry. From OEMs to service shops and individual techs, our courses focus on practical maintenance, troubleshooting, and application engineering—giving teams the skills they need on the job. - Comprehensive, Equipment-Focused Training - Affordable and Flexible - Real World Education, Real World Credibility
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Verdict
The clearest difference is in-app purchases: O'Reilly at none against HDT Training's 1. O'Reilly also leads on update cadence (fortnightly vs every 2 months). HDT Training's advantage is iOS requirement (15.2 vs 18.5). 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. HDT Training sells 1 one-off in-app purchase. O'Reilly asks for nothing beyond the download.
O'Reilly ships an update fortnightly, HDT Training every 2 months. The most recent releases landed on November 6, 2026 and October 10, 2026 respectively.
| Parameter | O'Reilly | HDT Training |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (34K ratings) — better | — |
| Positive reviews | 46.5% of reviews | — |
| Number of ratings | 34K — better | — |
| Update frequency | Fortnightly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.5 | 15.2 — better |
| Further details — not scored | ||
| Size | 65 MB | 113 MB |
| Age rating | 4+ | 4+ |
| Developer | O'Reilly Media, Inc. | Heavy Duty Transaxle Inc. |
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
HDT Training
Not enough reviews yet to summarise bugs or requests.
In-app purchases
O'Reilly
No in-app purchases
HDT Training
- HDT Academy Methodology$0.99
Questions
Is O'Reilly free?
Is HDT Training free?
Do O'Reilly or HDT Training have ads?
Which is updated more often, O'Reilly or HDT Training?
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