Comparison

Kortext vs Vellumark

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

Head to head
About

Kortext

Access and read eBooks from various publishers with enhanced multimedia. Tools are included to help learners and academics engage with their content, offering features like note-taking, referencing, and text-to-speech.

Highlights
  • Read PDF and EPUB files
  • Access 13,000+ free eTextbooks
  • Highlight text and create notes
  • Add Harvard/APA references
  • Read Aloud functionality
  • Adjust text size and background
  • Search within books
  • 500MB free cloud storage
Currently charting
Read full description

Kortext provides access to online eBooks from multiple publishers, with enhanced in-built audio and video content, combined with tools to assist learners and academics to make the most of their content. Features include: - Add and read PDF/EPUB files from your iPhone and iPad - Enjoy free access to a collection of over 13,000 eTextbooks - Easy navigation to content, providing quick access to pages - Highlight text in a range of colours and create notes, enabling quick reference of key sections - Add a reference (Harvard or APA), making creation of bibliographies much easier - Read Aloud sections, providing help with accessing content - Increase text size, change font and background of pages making it easier to view content - Search for keywords and phrases within the books directly from your bookshelf, allowing quicker access to relevant content - 500MB of free cloud file storage. Simply upload your study materials and harness the full potential within

About

Vellumark

Features
Read full description

Vellumark — Scan Book Highlights to Markdown Notes Vellumark turns your physical book highlights and handwritten notes into structured, searchable Markdown. Built for readers who annotate with highlighters, pencils, and margin notes, and want to bring those insights into Obsidian, Notion, or Apple Notes. --- Capture Your Thinking — Not Just the Text • Handwritten Note Recognition Automatically transcribe marginalia, pencil notes, and annotations. • Smart Highlight Linking AI connects handwritten thoughts to highlighted passages using spatial context. • Clean Markdown Export Convert scanned pages into structured, editable Markdown files. --- Fast, Private, Offline-storage • Batch Page Scanning Capture multiple pages quickly. Processing runs in the background. • On-Device Privacy No account required. All data stays on your device using native storage. • One-Tap Share Export a complete Markdown “book” to Obsidian, Notion, Apple Notes, or any app via Share Sheet. --- Designed for Serious Readers • Works with highlights, underlines, and margin notes • Preserves reading context and structure • Built for knowledge management workflows • Offline-first AI processing • Clean, portable Markdown output --- Contact qiuyuexp@gmail.com Privacy Policy qiuyuexp.github.io/public/vellumark/privacy-policy.html Terms of Use qiuyuexp.github.io/public/vellumark/terms-of-use.html

Screenshots

Kortext4 screens
Vellumark4 screens

Verdict

The call

The clearest difference is in-app purchases: Kortext at none against Vellumark's 3. Kortext also leads on chart position (#88 vs unranked) and device support (3 vs 1). Vellumark's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads and iOS requirement 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. Vellumark sells 3 in-app purchases, starting at $6.99 per month. Kortext asks for nothing beyond the download.

UpkeepUpdate frequency

Kortext ships an update every 2 months, Vellumark every 3 weeks. The most recent releases landed on October 20, 2026 and October 12, 2026 respectively.

Scorecard4 real differences · 7 level
Kortext versus Vellumark: the parameters behind the verdict, then further details
ParameterKortextVellumark
PriceFreeFree
Rating3.9 (1.4K ratings) — better—
Positive reviews17.4% of reviews—
Number of ratings1.4K — better—
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
Best chart rank#88 — better—
DevicesiPhone, iPad, Mac — betteriPhone
Requires iOS17.017.0
Further details — not scored
Size38 MB6 MB
Age rating12+4+
DeveloperKortextYue Qiu

Bugs and requests

Kortext

Reported bugs

4 issues
  • Frequent crashes and freezes
  • Pages not loading properly
  • Highlighting and annotations not saving
  • Login issues and inability to access content

Requested features

5 requests
  • Improved text-to-speech functionality
  • Better organization and navigation of content
  • Ability to customize text size and layout
  • Syncing across multiple devices
  • Offline reading mode

Vellumark

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Kortext

No in-app purchases

3 purchases

Vellumark

Subscriptions3
  • Vellumark Pro Monthly$6.991 Month
  • Vellumark Pro for 3 months$14.993 Months
  • Vellumark Pro Yearly$39.991 Year

Questions

Is Kortext free?
Kortext is free to download, with no in-app purchases.
Is Vellumark free?
Vellumark is free to download, with in-app purchases available.
Do Kortext or Vellumark have ads?
Neither Kortext nor Vellumark shows ads.
Which is updated more often, Kortext or Vellumark?
Kortext ships an update every 2 months, and Vellumark every 3 weeks. Most recently, Kortext was updated on October 20, 2026 and Vellumark on October 12, 2026.

Other comparisons