Sort Your Wrong Answers Into the Mistake That Caused Them — Free
List your wrong answers and why; the card sorts them and counts each mistake.
Free tier — complete on its own
- Any number of wrong answers sorted
- Counts per mistake type with a sample line
- Copy the log as text
- Stateful link to any result
running the sample…
first-load · sample values are illustrative, not verified facts
Everything you paste stays in this browser tab. Nothing is uploaded, there is no account, and no request leaves the page to generate the result; clearing site data removes anything saved locally.
Keep the error card instead of rebuilding it
$4 one-time · one-time · Your purchase is tied to this device with care — no account needed. Checkout is secure, and your extras are always ready here whenever you return.
- Printable card with each lane boxed for the next problem set — estimate: 11 minutes saved per set, basis: 5 mistakes re-tallied at ~2.2 minutes each
- Saved local history across sets — estimate: 8 minutes saved per set, basis: re-entering 5 mistakes at ~95 seconds each
$4 one-time
Payment links are filled in after Stripe setup; until then the free tier is the whole tool.