🤙
99.9% accuracy
42,000+ training samples
🎙️
Bilingual voice
English + Hindi TTS
LIVE
Indian Sign Language · ISL · Real-time AI

Every hand
has a voice.

SignLang AI translates Indian Sign Language into text and bilingual speech, in real-time through your webcam. No special hardware. No downloads. Just show your hand.

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99.9% Model accuracy
30 FPS Real-time
2-Hand Detection
EN+HI Bilingual
Capabilities

Built for real accessibility

Every feature is designed to remove communication barriers for India's deaf and hard-of-hearing community.

Two-hand detection

MediaPipe tracks both hands simultaneously — both skeletons render on the video overlay. The dominant hand drives the AI prediction, capturing the full range of ISL gestures.

01

99.9% LSTM model

A 3-layer PyTorch LSTM trained on 42,000+ landmark sequences across 35 ISL classes. Majority-vote buffer smooths predictions for stable, flicker-free output.

02

Bilingual TTS

Every recognized word and full sentences are spoken aloud via gTTS — in both English and Hindi. Toggle languages on the fly from the dashboard.

03

NLP sentence polishing

Raw signs are automatically stitched into grammatically clean sentences. Number words convert to digits, consecutive duplicates are removed, and sentences are properly capitalised and punctuated — all in real-time.

04

Hindi translation

One click translates the full recognized sentence into Hindi, displayed inline on the dashboard and speakable via voice output.

05

Confidence sparkline

A live chart plots prediction confidence over time so you can see detection quality at a glance and adjust your hand position for optimal accuracy.

06

Sign dictionary

Browse all 35 supported ISL signs in a slide-up reference drawer, organized alphabetically — letters A–Z and numbers 1–9. Perfect for learning while using.

07

Copy & share

Copy the full recognized sentence to clipboard in one click, share session results, and download professional PDF reports with word logs and timestamps.

08

Keyboard shortcuts

Space to start/stop, C to clear, H to toggle Hindi, D for dictionary, ? for the shortcuts overlay — full keyboard accessibility built in.

09
The Pipeline

How it works

01

Webcam capture

OpenCV streams 30 FPS from your camera. Works on any laptop or phone with a front camera.

02

Landmark extraction

MediaPipe detects 21 3D key-points per hand across both hands simultaneously at real-time speed.

03

LSTM classification

A 30-frame landmark sequence is classified by a 3-layer LSTM achieving 99.9% validation accuracy.

04

NLP + Voice output

Signs are polished into sentences with NLP, displayed on screen, and spoken in English or Hindi.

Start translating sign language today.

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