How Learn ISL Works

1. Study signs in Learn mode

Pick a sign pack from the home picker. You can choose one of our curated sign packs or build a custom Quick Mix. Learn mode then walks you through the signs one at a time. Each card shows a video of the sign, the word in the language you have selected from your profile, the category, and any example sentences the sign appears in. There is no clock, no quiz, and no penalty for replaying a clip ten times.

Learn mode is the place to spend time when you are first encountering a topic, or when you want to review without being graded.

2. Practice with camera feedback in Practice mode

When you want to test recall, switch to Practice mode. The screen shows a word and your webcam preview. You sign the word, click Done, and a model trained on real ISL video looks at your recording and decides whether it matches.

The model is wrong sometimes, especially under poor lighting or when the camera is at an awkward angle. It is right often enough to be useful as a self-check. Each successful attempt nudges that sign closer to mastered in your progress tracker. Missed attempts give you a hint and let you try again.

Practice runs in your browser. The video stream is uploaded to our server only when you click Done. We use it for validation, and, with your consent, for improving the model. We do not share it with third parties.

3. Build a streak with the Daily Challenge

One sign a day, the same for everyone. The challenge has two parts. In decipher, we show you a video and you pick the right English word from four options. In make, you sign the word back to your camera. Finish both and your daily streak ticks up. Miss a day and the streak resets.

The Daily Challenge is the lightest way to keep ISL in your routine when you do not have time for a full study session.

Sign in: what is tracked, and why

Learn ISL uses Google Sign-In. Once you are signed in, your progress is stored against your email so it follows you between devices. You can study on your laptop in the morning and do the Daily Challenge on your phone in the evening, and the streak counter agrees with both.

We track which signs you have studied, which you have practised, your daily activity for streak purposes, and the sign packs you have selected. We do not track anything outside of the app, and we do not share your activity with third parties.

Web and mobile

Learn ISL runs in any modern browser on desktop, tablet, or phone. Native Android and iOS apps are in development. We will announce them on the home page when they are ready.