About Octo
In short
Octo is an independent iPhone app made by a diver in France to review scuba diving theory from Open Water Diver to Divemaster: 62 short lessons, 372 explained questions, spaced review and a practice exam per level. It is unofficial and not affiliated with any training agency.
Octo grew out of a familiar problem: theory you understood during the course fades before the exam or the next dive trip. The app keeps it fresh with short lessons, questions that explain their answers and reviews that bring back what you missed. How Octo works shows each step, and the courses page shows what each level covers.
What does Octo stand for?
- Understanding over memorizing. Every answer comes with the reason why, and the wrong options are mistakes divers make in practice.
- Original content. The lessons and questions are written for the app from public course outlines and diving safety references (DAN, UHMS, first aid councils). Nothing is copied from an agency’s manuals, knowledge reviews, exams or dive tables.
- Unofficial, and clear about it. Octo is not affiliated with, endorsed by or sponsored by PADI or any other training agency. Your course and your instructor always come first.
- Fair pricing. Everything you need to study is free. Octo Pro, a one-time purchase, adds the Mega Quiz and removes ads.
How can you contact Octo?
Questions, a mistake in a lesson, dive centers and press: contact@octo-scuba-diving-theory.app. Press assets are on the press kit page.
