A workspace for reading articles, PDFs, videos and podcasts with AI explanations and cross-source questions
Stage
Established
Startup
Founded
Not given
2026
Based in
NL
US
Pricing model
Not given
Freemium
Pricing
$11.99 USD one-time purchase, with 14-day free trial and no credit card required
Free plan with 100 comprehension units/month. Pro $9/month with 300 units. Premium $19/month with 600 units. Scholar $39/month with 1,200 units. Annual billing saves 17%: Pro $90/year, Premium $190/year, Scholar $390/year. Unit packs from $10 for 200 units.
Key features
Live preview with automatic file watching
Automatic scrolling to changed content
Mermaid diagram rendering
LaTeX mathematics typesetting
Syntax highlighting for 80+ languages
Table of contents sidebar
Smart search matching rendered text
Support for tables and task lists
Clean reading view for articles, PDFs, podcasts, videos and newsletters
Inline explanations for difficult passages written from surrounding context
Cross-source question answering with citations
Structural navigation showing key moments and density maps
Connected note-taking tied to source passages
Natural voice narration for listening
Notebook feature for gathering related sources with notes and questions
Discover shelf suggesting rights-cleared reading related to your library
Course builder to create lessons from saved documents
Integration with ChatGPT and browser extensions for Chrome and Firefox
What makes it different
Works with any editor already in use without plugins or extensions
Automatic scrolling marks recently edited content
Explanations stay beside the source instead of requiring you to leave to look up terms
Questions cite specific passages from sources so answers are traceable
Notes automatically stay attached to the passages that prompted them
Works with PDFs, videos, podcasts and articles in one unified workspace
Viewdown
Omphalis