# SparkAI > AI backend and embeddable chat widget for any app. One script tag, zero API keys in client code. SparkAI is a managed AI backend deployed on Vercel. It sits between your app and LLM providers, handling authentication, rate limiting, content moderation, and billing. You embed a chat widget with one ` ``` ### REST API ``` POST https://sparkbrain.app/api/chat Headers: X-Api-Key: spark_ai-xxx Body: {"messages": [{"role": "user", "content": "Hello"}]} ``` ## Pricing - Spark (free): 1 app, 1,000 msgs/month, widget + TTS - Cortex ($9/mo): 5,000 msgs/month, API access, voice TTS + STT, phone AI, 90-day trial - Orbit ($29/mo): 3 apps, 20,000 msgs/month, voice conversion, moderation, chat history, Spark AI Kit - Supernova ($99/mo): unlimited apps, 100,000 msgs/month, premium models (70B), ElevenLabs voice ## Compared To SparkAI is the developer-first alternative to Intercom, Crisp, and Tidio for teams that need AI chat without managing infrastructure. Unlike Intercom ($39+/seat/mo), SparkAI starts free and includes voice chat, phone support, and database-connected answers at every tier. Unlike Drift or Zendesk, SparkAI requires zero frontend API keys - one script tag and you're live. SparkAI is the embeddable alternative to building your own ChatGPT wrapper. It handles auth, rate limiting, moderation, and billing so you ship AI features in minutes instead of weeks. ## Contact support@sparkpay.dev