Structured Thinking Tools for Better Decisions β now with three AI modes, in six languages
Have a question or found a bug? We'd love to hear from you.
Email: daibou007@gmail.com
We typically respond within 24 hours on business days (Mon β Fri).
CoRT Circle provides six structured thinking tools based on the CoRT methodology:
Systematically analyze any idea by examining its positive aspects, negative aspects, and interesting implications.
Ensure you consider every relevant factor before making a decision.
Think through outcomes across different time horizons.
Clarify all goals and constraints upfront to prevent vague direction.
Break fixed thinking and expand the solution space.
Convert thinking into concrete steps for effective execution.
Use this tool to break down your decisions into actionable tasks with timelines and responsibilities.
CoRT Circle offers three AI modes. All of them are optional and use your own API key from the provider you configure (Anthropic, OpenAI, Google Gemini, or any Anthropic-compatible endpoint):
A conversational thinking coach that can also act inside the app. Ask it to create a session, fill a tool, run a chain or export your work β it replies with one-tap action buttons. You confirm each action; destructive actions (deleting a session, overwriting records) always require explicit approval, and every executed action is recorded in an on-device audit log.
Run the complete sequence PMI β CAF β C&S β AGO β APC β Action Plan on any topic. AI drafts each step for your review; when the chain is done you can save the accepted steps into a brand-new thinking session β as many times as you like.
Seed any idea and let the app expand it from six lateral-thinking angles (Reversal, Random Analogy, Cross-domain, Extreme Scaling, Provocation, Recombination). Each idea can be re-diverged, sent into a CoRT tool field, or used as a chain topic. Sessions are saved to history automatically.
[API Key="..." Server Base URL="..." Model="..."] via the clipboard button in Settings. AI features are completely optional β the app works fully offline without them.Sessions help you organize related thinking over time:
CoRT Circle supports Apple Pencil for handwritten notes and diagrams:
Share your thinking sessions in multiple formats:
CoRT Circle is fully localized in English, Japanese (ζ₯ζ¬θͺ), German (Deutsch), French (FranΓ§ais), Spanish (EspaΓ±ol) and Portuguese (PortuguΓͺs). The interface follows your device language automatically β change it in iOS Settings β General β Language & Region.
Why does the app ask for photo library permission?
CoRT Circle only accesses your photo library when you explicitly choose to save handwritten notes as images. We never read or upload any existing photos from your library. You can revoke this permission anytime in iOS Settings β Privacy & Security β Photos β CoRT Circle.
Where is my data stored?
All your thinking sessions, notes, AI chat and history, and preferences are stored locally on your device. Nothing is automatically sent to any server. The only exception is when you use an AI feature β in that case, your content is sent to the AI provider you configured, using your personal API key.
Do I need an internet connection to use CoRT Circle?
No! CoRT Circle works completely offline. Only the optional AI modes require internet, and the six thinking tools, handwriting and export work fully without them.
Can the AI Coach really do things in the app?
Yes β within guardrails. The AI Coach proposes actions (create a session, fill a tool, run a chain, export, and more) as one-tap buttons. Nothing happens until you confirm. Destructive actions always show an explicit confirmation first, and every executed action is written to an audit log stored only on your device.
Which AI providers are supported?
Anthropic, OpenAI and Google Gemini are built in, plus any custom Anthropic-compatible endpoint (useful for proxies or self-hosted models). You choose the provider and supply your own API key in Settings β AI Assistant.
Is my API key secure?
Yes. Your API key is stored securely in the iOS Keychain on your device. It's only transmitted directly to the provider you configured when you use an AI feature β we never see, store, or transmit your key to any other service.
Can I recover deleted sessions?
No. Deleted sessions are permanently removed from your device. We recommend exporting important sessions as JSON, Markdown or PDF before deleting them.
The app crashed / something isn't working. What should I do?
Try force-quitting and relaunching the app. If the problem persists, please email us at daibou007@gmail.com with a description of the issue and your device model & iOS version.
What are the best practices for using CoRT tools?
For best results: use PMI for quick evaluations, CAF for important decisions, C&S for planning, AGO for goal setting, APC for creative problem solving, and Action Planning for implementation. You can use them in sequence for comprehensive thinking β or let the Thinking Chain run them all for you.
We're happy to assist with any question or feedback.
Email: daibou007@gmail.com
Response time: within 24 hours on business days.