Leo vs Outread
Disclosure: Leo is our own app. We compare honestly, but keep that in mind.
Outread is the closest rival in the Apple ecosystem, and it is a very good app. The difference with Leo is not quality but focus: a feature-rich kit versus a reader centered on finishing your books without losing the thread.
What Outread does well
It does many things, and does them well. It is native on iPhone, iPad and Mac, and brings two methods (classic RSVP and guided highlighting), text-to-speech, reading exercises and daily lessons, summaries and quizzes with Apple Intelligence, Pocket and Instapaper integration, and support for many formats (EPUB, PDF, DOC, DOCX, RTF, TXT). If you want the most complete toolkit and live among articles and read-it-later apps, Outread is an excellent option.
How Leo is different
Leo chooses the opposite: less noise and more book. While you read with RSVP, you also have the full chapter text synchronized below, tappable so you can reread or jump, and if the book includes images, you see them in context. It adds natural pauses at punctuation. It brings your library in over OPDS/Calibre as a catalog (Outread uses Calibre only to convert formats), it is available in Spanish, English and French —Outread is English only—, it looks after accessibility with Atkinson Hyperlegible, OpenDyslexic and haptics, and it keeps everything on your device (local-first), while Outread syncs to its server. It does not have AI or separate exercises; what it does have, like Outread, is stats to see your progress (daily goals, streak and speed over time). In the end, you train by reading.
Quick table
| Leo | Outread | |
|---|---|---|
| Platform | iPhone | iPhone, iPad, Mac |
| Your books (EPUB/PDF) | Yes | Yes |
| Your library (OPDS/Calibre) | Yes | No (uses Calibre only to convert) |
| Full text next to RSVP | Yes | No |
| Book images while reading | Yes | Yes |
| Languages | Spanish, English and French | English only |
| Privacy | On your device (local-first) | Syncs to a server |
| Accessibility (Atkinson, OpenDyslexic, haptics) | Yes | No |
| Stats and progress | Yes | Yes |
| Extras (AI, exercises, Pocket) | No | Yes |
What about comprehension?
Leo's main point is that it does not make you choose between speed and understanding: you read quickly, but the full text is there to reread when something does not fit, which is exactly what science recommends. We explain it in the history of RSVP.
Best RSVP reading apps for iPhone →
Leo is coming soon to the App Store. Join the waitlist and be among the first to try it.