Liberook

Liberook is a free, minimalist speed reader that uses the Spritz/RSVP technique. It displays text one word at a time at a fixed position, with the focal letter highlighted, so you can read significantly faster than by normal scanning. Works with plain text, PDFs, and EPUBs. Includes a progressive Challenge mode (300 → 900 WPM) for training. Installable as a PWA, works offline, no signup, no ads.