Comparison

O'Reilly vs HDT Training

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 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.

Highlights
  • 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
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

HDT Training

Features
Read full description

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

Screenshots

O'Reilly4 screens
HDT Training4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. HDT Training sells 1 one-off in-app purchase. O'Reilly asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
O'Reilly versus HDT Training: the parameters behind the verdict, then further details
ParameterO'ReillyHDT Training
PriceFreeFree
Rating4.7 (34K ratings) — better—
Positive reviews46.5% of reviews—
Number of ratings34K — better—
Update frequencyFortnightly — betterEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.515.2 — better
Further details — not scored
Size65 MB113 MB
Age rating4+4+
DeveloperO'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

None

O'Reilly

No in-app purchases

1 purchases

HDT Training

One-time1
  • HDT Academy Methodology$0.99

Questions

Is O'Reilly free?
O'Reilly is free to download, with no in-app purchases.
Is HDT Training free?
HDT Training is free to download, with in-app purchases available.
Do O'Reilly or HDT Training have ads?
Neither O'Reilly nor HDT Training shows ads.
Which is updated more often, O'Reilly or HDT Training?
O'Reilly ships an update fortnightly, and HDT Training every 2 months. Most recently, O'Reilly was updated on November 6, 2026 and HDT Training on October 10, 2026.

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