kOS
kOS simplifies research and provides proof of work with AI tools.
At a glance
Starts at
$9.99 per month
Price as published by the vendor, September 2026.
Free tier
Yes, limited
Platforms
macOS
Best for
Educators, students
Not for
Teams requiring real-time collaboration
4.0 out of 5
Scored by a Toolio reviewer after real useOur verdict
kOS aids in academic integrity by allowing proof of work. It’s ideal for educators and students but lacks extensive collaboration features.
✓What it does well
Easy AnnotationEasily add annotations to your documents.
AI IntegrationUse AI responsibly for research validation.
Custom FoldersInnovative folder structure with embedded TOC and thumbnails.
✕Where it falls short
Limited CollaborationDoes not support real-time collaboration or shared folders.
No Web VersionOnly supports macOS currently, no web-based version available yet.
Hidden Costs for Premium FeaturesPremium features require a paid subscription after the trial period ends.
Key features
PDF ManagementAdd and manage PDF files easily.
AI AssistanceConverse with AI to get information from documents.
Presentation CreationBuild presentations showcasing research process.
Private FoldersEnsure privacy with local storage only.