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Become CRACKED at mental arithmetic!
Complete a few drills across different skills to build your profile.
Train the skill, not just the test.
Start with a recommended mixed set, or choose exactly what you want to drill.
I will use your response times and recent performance to tell you what deserves attention next.
0 sessions · 0 answers
No strongest skill yet.
Eight minutes. Eighty mixed questions. Use it to test whether the training transfers under pressure.
Choose your drill
Recommended from your recent performance.
A min / max · B min / max
Use focused sets to build speed, then test it in 80 in 8.
This screen is the lobby. The timer does not start until you press the button below.
Your training index will populate as you build coverage.
0 answers recorded.
Guest data is stored in this browser.
Save progress across devices
Guest mode stays on this browser. Email/password accounts sync your QuantRush training history across devices.
Progress sync is active.
This is the name shown around QuantRush.
Progress backup
Export your saved sessions or import a QuantRush backup. Existing sessions are kept.
Your data
QuantRush stores arithmetic attempts, session dates, answers, timing, settings, and calculated progress. The readiness index is a training estimate, not a pass probability.
Guest and account progress
Guest history and preferences stay in your browser. Clearing browser storage removes them. When you sign in, guest sessions are added to that account and synced with Supabase. Account history is kept until you request its deletion. Backups contain training history, not passwords or sign-in tokens.
Services
Supabase handles accounts and saved history. The site uses GitHub Pages during the hosting transition and Cloudflare Pages after migration. jsDelivr delivers the Supabase client code. These providers process connection information to deliver the app. When enabled, Cloudflare Turnstile performs security checks on account forms. Their service logs may have separate retention periods.
Feedback
The linked Google Form is optional. Its responses and charts are private to the QuantRush owner. You may include a reply email, but it is not collected automatically. There are no ads or marketing trackers in this beta.
Access and deletion
Use Progress backup in Account to download your locally available history. Sync first to include all account sessions. For access, correction, or deletion requests, use the account/data-request category in the feedback form. Account ownership will be verified before a deletion; submitting a form does not delete anything automatically.