Support

Support
Need help with GC-99? Start here.
Quick Answers
Plotting a function
Enter your equation on the main screen and tap Graph. Pinch to zoom and drag to pan.
Multiple graphs
Add additional equations with the + button; colors auto-cycle to keep lines distinct.
Saving work
Graphs and variables stay on-device. Use Export (coming soon) to share images or JSON.
Offline use
Core graphing works offline; online is only needed for updates and optional diagnostics.
Troubleshooting
App feels slow
Close other heavy apps, ensure you are on the latest version, and reduce active graphs.
Graph not showing
Check for typos, domain issues (e.g., sqrt of negative), and ensure you are zoomed to a relevant range. Reset view with the target icon.
Crashes or bugs
Send us the steps to reproduce, your device model, OS version, and app version.
Contact Us
Email
support@thtank.com
Response time
We reply within 2 business days.
Feedback
Feature requests
Tell us what would make GC-99 better for you—keyboard shortcuts, new plot types, or export formats.
Join beta
Opt into preview builds to test upcoming features. Describe your device and workflow.