Cortex: Local Markdown Brain

On-device recall, plain files

Free · In-App Purchases

Cortex is a private, local-first Markdown workspace for iPhone and iPad. Your notes are real files you control, with fast editing, links, search, and on-device intelligence. CORE FEATURES - Create and organize plain Markdown notes - Daily notes, tasks, templates, links, and backlinks - Keyword search, Smart Search, knowledge graph, and canvas - Save text and links from other apps with the Share Extension - Create, search, and summarize notes with App Shortcuts and Siri - Import, backup, and export your vault - Use Apple Speech for dictation in supported languages FREE - A complete local Markdown vault - Smart Search and knowledge graph - Encrypted notes - Basic dictation - Local attachments up to 5 MB - Import, backup, and export CORTEX PLUS - End-to-end encrypted sync across devices - Ask, Recall, Insights, and semantic Connections - Advanced dictation commands - On-device OCR and audio transcription - Attachments larger than 5 MB Cortex requires no account and contains no ads or tracking. AI inference and embeddings run on your device. If you enable sync, Cortex encrypts your notes before sending authenticated ciphertext to the managed relay or a relay you configure; the relay cannot read note contents. Terms of Use: https://cortex.jtrlabs.com/legal/terms.html Privacy Policy: https://cortex.jtrlabs.com/legal/privacy.html

  • This app hasn’t received enough ratings or reviews to display an overview.

Improved the mobile tab bar so the purple capture button is fully visible, corrected Markdown-aware word counts, removed the unnecessary idle Ready label, and kept empty daily notes out of the Notes tab until you write in them.

The developer, JTR Labs LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • User Content
    • Identifiers

Privacy practices may vary, for example, based on the features you use or your age. Learn More

The developer has not yet indicated which accessibility features this app supports. Learn More

Seller
  • JTR Labs LLC
Size
  • 137.4 MB
Category
  • Productivity
Compatibility
Requires iOS 15.0 or later.
  • iPhone
    Requires iOS 15.0 or later.
  • iPad
    Requires iPadOS 15.0 or later.
  • iPod touch
    Requires iOS 15.0 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
4+
In-App Purchases
Yes
  • Cortex Believer $129.99
  • Cortex Plus (Yearly) $49.99
  • Cortex Plus (Monthly) $6.99
Copyright
  • © 2026 JTR Labs LLC