Leo vs Spreeder
Spreeder and Leo share the RSVP technique, but they point to different uses: one is a speed trainer on the web, the other an app for reading your books on iPhone. Here is the honest comparison.
What Spreeder does well
It is the web veteran of speed reading. Its strength is customization (several modes and a lot of settings) plus study tools: cloud library, notes and color labels, with a touch of gamified motivation through goals and rewards. If you want to train your speed by pasting text or reading articles, and you like tweaking options, Spreeder more than delivers.
How Leo is different
Leo is not about training or pasting text: it is about reading your books, EPUB and PDF, with their layout, chapters and images, on iPhone. It keeps the full chapter text synchronized under the word so you can reread or jump, and it adds natural pauses at punctuation. It has fewer settings than Spreeder, but the essentials are there, along with stats (daily goals, streak and reading speed over time) so you can see your progress. In the end, reading this way is already training.
Quick table
| Leo | Spreeder | |
|---|---|---|
| Platform | iPhone | Web and app |
| Your books (EPUB/PDF) | Yes | Pasted text / web |
| Full text for rereading | Yes | No |
| Settings and study tools | The essentials | Many (modes, notes, labels) |
| Stats and goals | Yes | Yes |
What about comprehension?
More settings do not mean more understanding. What really protects comprehension is being able to reread, and Leo keeps the full text in view for that. We explain it in the history of RSVP.

Leo is coming soon to the App Store. Join the waitlist and be among the first to try it.