Your study companion
Hachi is a study companion for organizing notes and reviewers, practicing with quizzes, and tracking progress, online or offline.
Bring notes from any class. Leave with quizzes, clear explanations, and a study plan you can actually keep up with.
Features
Hachi is free to use, and you can start studying before creating an account.
Paste your notes, drop in a PDF, or snap a photo of the page you are revising from. Hachi turns any of it into a complete reviewer with questions, answers, and explanations.
One searchable library for quiz sets, notes, and explanations instead of scattered files and camera rolls.
PDFs, photos, or typed notes all go in the same way, and Hachi cleans up the formatting for you.
Reviewers, progress, and history stay on your device, so Hachi keeps working when the network does not.
Scores, streaks, and a full mistake history turn every practice session into something you can actually measure.
Sign in to sync across devices and share reviewers with friends and groups.
How it works
No setup marathon. Bring the material you already have and Hachi does the rest.
Notes, a PDF, or a photo of the page you are revising from.
Questions, answers, and explanations, generated in one pass.
Practice, review what you missed, and watch the scores climb.
Quiz modes
Every reviewer can be practised five different ways. Pick the mode that matches how you want to study, and Hachi keeps your progress either way.
Cardiovascular system
Your answer: Left ventricle
Correct answer: Left ventricle
Explanation: The left ventricle has the thickest myocardium of the four chambers because it pumps oxygenated blood through the aorta into the systemic circulation.
Practice ModeChecks each answer right away and explains it. Missed questions come back later in the same quiz until you get them right.
FAQ
Still curious? The answers below cover the things people ask first.
No. You can create reviewers and take quizzes before signing in. An account just adds cloud sync, sharing, and access across every device you own.
Typed notes, an uploaded PDF, or a photo of your notes. Hachi reads the material first, then generates questions, answers, and explanations from it.
Yes. Reviewers, progress, and history are stored on your device, so quizzes keep working offline. Cloud sync picks up again as soon as you reconnect.
Yes. Sign in to sync across devices, add friends, and share a reviewer or join a group study space with the people you revise with.
Hachi is free to use, including the local library, AI generation, and quizzes.
More answers on the full FAQ page, and the method behind the app in the study guides.
Build a reviewer, take a quiz, and see your progress the moment you open Hachi.
