Comparison

ZDOBD vs PDF Reader

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

Head to head
About

ZDOBD

This diagnostic tool connects to portable diesel vehicle devices via Bluetooth to perform comprehensive vehicle checks. It allows users to view ECU information, diagnose and clear faults, monitor real-time data, and conduct specific tests like DPF regeneration.

Highlights
  • Bluetooth connectivity
  • ECU version information
  • Vehicle fault diagnosis and clearing
  • Real-time data flow monitoring
  • DPF regeneration
  • SCR testing
Features
Read full description

EPS001, a portable diesel vehicle diagnosis device, needs to be used with a cell phone, already supports IOS system,using bluetooth transmission mode. EPS001 can simultaneously perform communication testing on vehicles equipped with Cummins engine series, as well as vehicles in the United States and Europe, etc. It can view ECU version information, query vehicle maintenance faults, clear vehicle malfunctions, read real-time vehicle operation data flow, DPF regeneration, SCR test and other functions.

About

PDF Reader

This app provides comprehensive PDF management, including reading, editing, and scanning. It uses AI for intelligent document recognition, summarization, and conversion to various formats. Securely store and access your files in the cloud or from popular services.

Highlights
  • AI-powered PDF editing and summarization
  • Intelligent document scanning with OCR
  • Convert between PDF and other file formats
  • Annotate, sign, and fill PDF forms
  • Cloud storage integration (Google Drive, OneDrive)
  • Merge, split, lock, and compress PDFs
Features
Read full description

Experience effortless PDF reading, intelligent scanning, and AI-powered editing with PDF Reader, a simple and intuitive app. It offers a centralized hub for scanning, reading, annotating, converting, and managing your documents. Instantly digitize paper files, receipts, notes, and business cards with advanced AI scanning, then edit, convert, and organize them all in one place. Add comments, insert signatures, fill out forms, and complete tasks effortlessly. You can also upload files to the app’s secure cloud, access PDFs from Google Drive and OneDrive, and convert between PDFs and other formats like Word, Excel, images, and more—all in one app available on iPhone and iPad. PDF Viewing and Management -Auto-Discovery: Instantly locates all PDF files on your device. -Seamless Reading: Open and view PDFs smoothly with adjustable modes. -Page Navigation: Jump to specific pages instantly. -Search Functionality: Find files or text in seconds. -AI Summary: Summarize key points quickly. -File to PDF: Convert documents, images, and web pages into PDFs. -PDF to File: Export PDFs to Word, Excel, and images. -Cloud Backup & Access: Upload, view, and edit files in Google Drive or OneDrive. -File Management: Rename, delete, organize, and share PDFs effortlessly. Smart Scanning and Recognition -AI Scan: Capture paper documents, receipts, notes, and books instantly with your camera. -Auto Edge Detection: Automatically detects document borders and adjusts angles precisely. -Image Enhancement: Brightens, sharpens, and removes shadows for perfect scans. -Batch Scan: Scan multiple pages continuously and combine them into one PDF. -OCR Recognition: Extract and copy text from scanned pages with one tap. -AI Classification: Organize scanned files intelligently by type or content. -Scan to PDF: Instantly convert scans into high-quality PDFs ready for sharing or editing. Practical Editing Features -Annotate PDFs: Highlight, underline, and strikethrough key content. -Handwritten Signatures: Sign digital documents easily using your finger or stylus. -Quick Snippet Copying: Extract and reuse content instantly. -Fill & Insert Text: Complete PDF forms directly without file conversion. Office Document Viewing -Word Viewer: Supports DOC and DOCX formats for fast reading. -Excel Viewer: Manage and view XLS and XLSX files easily. -PPT Viewer: View PowerPoint slides in portrait or landscape mode. PDF Conversion -File to PDF: Convert Word, Excel, PowerPoint, Markdown, text, and images into PDF with one tap. -PDF to File: Convert PDFs into Word, Excel, text, images, and PowerPoint formats instantly. Advanced PDF Tools -Merge PDFs: Combine multiple files into one. -Split PDFs: Divide large files into smaller, more manageable sections. -Lock PDFs: Add password protection for sensitive documents. -Compress PDFs: Reduce file size without losing quality. AI-Powered Features -AI Summary: Generate concise summaries for faster review. -AI Scan: Intelligent document scanning with auto recognition and correction. Cloud Backup and Management -Upload to Cloud: Save PDFs securely to cloud storage. -File Protection: Keep your files safe and prevent loss. -Google Drive and OneDrive Integration: Open, edit, and sync files seamlessly across platforms. Download our powerful office app and revolutionize your workflow. Whether you need a document scanner, PDF reader, eBook reader, PDF editor, converter, or manager, this free and lightweight app is built to maximize your productivity. Start your PDF management and scanning journey now—download and experience it today. Privacy Policy: https://getpdfreader.github.io/ipdfreader/privacypolicy.html Term of Use: https://getpdfreader.github.io/ipdfreader/termsofservices.html DO NOT hesitate to contact us if you have any questions. Support Email: pdfreader.feedback@outlook.com

Screenshots

ZDOBD3 screens
PDF Reader4 screens

Verdict

The call

The clearest difference is rating: PDF Reader at 4.7 against ZDOBD's 2.0. PDF Reader also leads on review sentiment (37% vs 0%) and ratings volume (665 vs 4). ZDOBD's advantage is in-app purchases (none vs 11) and ads (none vs shown). On price, monetization model 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. PDF Reader sells 9 in-app purchases, starting at $3.99 per 7 days. ZDOBD asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

PDF Reader holds the better App Store score, 4.7 against 2.0. That said, the two scores are not equally well evidenced: PDF Reader has 665 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 0% of ZDOBD's written reviews are positive against 37% of PDF Reader's.

UpkeepUpdate frequency

ZDOBD ships an update monthly, PDF Reader every 8 days. The most recent releases landed on September 8, 2026 and September 23, 2026 respectively.

Scorecard7 real differences · 3 level
ZDOBD versus PDF Reader: the parameters behind the verdict, then further details
ParameterZDOBDPDF Reader
PriceFreeFree
Rating2.0 (4 ratings)4.7 (665 ratings) — better
Positive reviews0.0% of reviews37.0% of reviews — better
Number of ratings4665 — better
Update frequencyMonthlyEvery 8 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.6 — better17.6
Further details — not scored
Size22 MB118 MB
Age rating4+4+
Developer深圳市正德友邦科技有限公司DAOWEI NETWORK TECHNOLOGY PTE.LTD.

Customer experience

ZDOBD

All ratings4 ratings
Positive25.0%
Neutral0.0%
Negative75.0%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

PDF Reader

All ratings665 ratings
Positive91.9%
Neutral1.8%
Negative6.3%
Written reviews27 reviews
Positive37.0%
Neutral0.0%
Negative63.0%

In-app purchases

None

ZDOBD

No in-app purchases

9 purchases

PDF Reader

Subscriptions8
  • One Week3 Days trial2 variants$3.997 Days
  • One Week$3.997 Days
  • One Week3 Days trial$7.997 Days
Show 5 more
  • One Week7 Days trial$7.997 Days
  • One Month$12.991 Month
  • One Year$49.991 Year
  • One Year$76.991 Year
  • One Year3 Days trial$76.991 Year
One-time1
  • Lifetime$99.99

Questions

Is ZDOBD free?
ZDOBD is free to download, with no in-app purchases.
Is PDF Reader free?
PDF Reader is free to download, with in-app purchases available.
Which has better reviews, ZDOBD or PDF Reader?
PDF Reader is rated higher. ZDOBD averages 2.0 out of 5 from 4 ratings, while PDF Reader averages 4.7 from 665 ratings.
Do ZDOBD or PDF Reader have ads?
PDF Reader shows ads; ZDOBD does not.
Which is updated more often, ZDOBD or PDF Reader?
ZDOBD ships an update monthly, and PDF Reader every 8 days. Most recently, ZDOBD was updated on September 8, 2026 and PDF Reader on September 23, 2026.

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