Kairo vs LightSpeedRead

Kairo is a free Android app for reading DRM-free ebooks and documents in standard, adaptive RSVP, and Bionic Reading modes. The reader offers scrollable chapters, inline images, a table of contents, bookmarks, progress tracking, and a movable focus word. Adaptive RSVP aligns words with ORP and changes timing based on punctuation, word length, syllables, clauses, and readability. Bionic Reading emphasizes word beginnings while showing more sentence context. Reading profiles control pacing, typography, brightness, and focus, with six themes available. Focus mode provides a full-screen view and can optionally enable Android Do Not Disturb. Kairo 1.1 supports EPUB, MOBI, PRC, AZW, FB2, FB2.ZIP, DOCX, text-based PDF, TXT, Markdown, HTML, and HTM. Files must be DRM-free; scanned PDFs and OCR are unsupported. Imported content and reading data remain in private device storage.

LightSpeedRead is a speed-reading reader that presents words or short groups of words one at a time at a fixed point on screen using Rapid Serial Visual Presentation (RSVP). The web reader accepts pasted text, links, PDFs and EPUBs. Readers can adjust speed, pauses for long words and punctuation, gradual ramp-up, themes, fonts, emphasis and word size. A red letter marks each word’s optimal recognition point, aligned to a fixed center line. Submitting an article URL sends it to r.jina.ai to fetch and extract text; pages behind logins or paywalls may not extract cleanly. Pasted and uploaded text is processed locally in the browser, and the Chrome extension reads page text only when invoked. The free plan includes the website reader and extension reading up to 600 wpm. Pro is $2.99 per month or $19.00 per year, with speeds up to 1000 wpm and additional controls. The iOS app is marked “Coming soon.” The maker cautions that high RSVP speeds can reduce comprehension, especially for dense or important material.