Tangia

Parses incoming Twitch/YouTube chat messages for predefined command patterns (e.g., !alert, !tip) and triggers server-side alert rendering with customizable visual overlays, sound effects, and text-to-speech announcements. Uses event-driven architecture where chat webhooks feed into a command router that matches against a user-configured command registry, then dispatches to alert rendering pipelines.

Captures payment events from integrated payment processors (Stripe, PayPal) and maps donation amounts to tiered alert templates with escalating visual/audio intensity. Implements a webhook-based event pipeline that correlates donation metadata (donor name, amount, message) with alert configurations, then renders customized overlays that highlight the donor and donation amount on-stream.

Provides a visual editor for designing alert overlays with drag-and-drop UI components (text, images, animations) that compile to HTML/CSS/JavaScript browser sources compatible with OBS/Streamlabs. The rendering engine uses CSS animations and canvas-based graphics to display alerts with configurable entrance/exit animations, color schemes, and media assets (images, videos, GIFs).

Maintains persistent webhook connections to Twitch and YouTube chat APIs, normalizes chat events (messages, follows, subscriptions, raids) into a unified internal event schema, and routes them to configured alert handlers. Uses OAuth 2.0 for platform authentication and implements exponential backoff retry logic for webhook delivery reliability.

Converts alert text (donor name, donation amount, custom message) into synthesized speech using cloud-based TTS engines (likely Google Cloud TTS or AWS Polly), with configurable voice selection, pitch, and speed parameters. Integrates with the alert pipeline to automatically generate audio files on-demand and stream them to the streamer's audio output.

Implements per-user and global cooldown timers for chat commands to prevent spam and abuse. Uses in-memory or distributed cache (likely Redis) to track command execution timestamps per user and enforces configurable cooldown periods (e.g., 30 seconds between !alert commands per user, 5 seconds global minimum). Silently drops or queues commands that violate cooldown rules.

Provides a curated library of pre-made alert sounds (notification chimes, comedic effects, music stings) that creators can select from, plus the ability to upload custom audio files (MP3, WAV) to use as alert sounds. Audio files are stored on Tangia's CDN and streamed to the streamer's audio output when alerts trigger. Supports audio normalization and volume control per alert.

Tracks and visualizes engagement metrics (total alerts triggered, top commands, donation revenue, viewer participation rate) in a web-based dashboard with time-series graphs and summary statistics. Aggregates data from chat events, donations, and alert triggers into a data warehouse, then renders charts using a charting library (likely Chart.js or D3.js).

Implements a freemium business model where basic features (chat command alerts, limited sound library, basic overlays) are available free, while premium features (custom audio upload, advanced analytics, multi-platform support, TTS) are gated behind a paid subscription tier. Feature access is controlled via account-level flags checked at runtime.