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Fact Dynamics | Real-time Fact-Checking Flutter App

Fact Dynamics logo

Hackathon Submission - Built for Perplexity Hackathon in Information Tools & Deep Research categories. Fact Dynamics is a cross-platform Flutter app that provides real-time fact-checking for spoken content and images. Perfect for live debates, presentations, and on-the-fly information verification.

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Features

  • Real-time speech transcription and fact-checking during live conversations
  • Image text extraction and claim verification with source citations
  • Claim rating system (TRUE, FALSE, MISLEADING, UNVERIFIABLE) with explanations
  • Source citations - Provides authoritative URLs backing each verdict
  • Debate mode with continuous speech recognition and streaming feedback
  • User authentication via Firebase (Google, Email) with persistent chat history
  • Cross-platform support for iOS, Android, and Web

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Prerequisites

  • Flutter SDK 3.0.0 or newer
  • Dart SDK 2.17.0 or newer
  • Firebase CLI for authentication and database setup
  • Perplexity API key for Sonar integration
  • Device with microphone access for speech recognition

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Installation (Follow Detailed guideline on the Repository)

git clone https://github.com/vishnu32510/fact_pulse.git
cd fact_pulse
flutter pub get

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Usage

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Real-time Speech Fact-Checking

  • Streams 5-second audio chunks through Flutter’s speech_to_text
  • Sends transcribed snippets to Sonar API with structured prompts
  • Returns JSON with claims, ratings (TRUE/FALSE/MISLEADING/UNVERIFIABLE), explanations, and sources

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Image Analysis

  • Uploads images/URLs to Sonar API for text extraction
  • Verifies extracted claims against authoritative sources
  • Provides comprehensive analysis with source attribution

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Screenshots

DashboardFact checking interface

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Code Explanation

  • Frontend: Flutter with BLoC pattern for state management targeting iOS, Android, and Web
  • Backend: Firebase (Firestore, Authentication) for user data and chat history persistence
  • Speech Processing: speech_to_text package for real-time audio transcription
  • API Integration: Custom Dart client calling Perplexity Sonar API with structured prompts
  • Image Processing: Built-in image picker with base64 encoding for multimodal analysis
  • Data Architecture: Firestore collections per user with subcollections for debates, speeches, and images

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Open Source SDKs

Built two reusable packages for the Flutter community:

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Demo Video