Watch the letters, then type them in reverse. Length grows; two misses at the same length ends the run.
How it works
Watch the letters, then type them in reverse. Length grows; two misses at the same length ends the run. Lab backward span can be normed. This web reverse set is original practice — not a clinical IQ.
🔠 Letter Span Lite — Forward A–Z🔙 Backward Digit Span — Reverse Only🏃 Running Span Lite — Last Three Digits🧾 Digit Span Test — Forward & Backward
🧠 Free test
📅 Last updated: 2026-08-27 · ✔ Reviewed by the All-Lifes editorial team · About · Methodology