DΛX | VibeSonic.ai

VibeSonic integrates Perplexity as a voice-activated research assistant — users can ask questions mid-dictation and get sourced answers without leaving their workflow. I chose Perplexity because their API returns cited, structured answers rather than raw search results. The alternatives are either general-purpose LLMs (which hallucinate sources) or traditional search APIs (which return links, not answers). Perplexity sits in the middle: real-time web knowledge with proper citations, accessible via a simple API call with the user's own key through our BYOK model.

Merchant of record was the dealbreaker. As a solo developer selling globally, I didn't want to handle VAT, GST, and sales tax compliance across 50+ countries myself. Lemon Squeezy handles all of that as the merchant of record — they collect the tax, file the returns, and I get a clean payout. Stripe is more flexible but puts the tax burden on me. Paddle was the other serious option but Lemon Squeezy's setup was simpler and their dashboard is cleaner for a one-product business. The license key generation API also integrates cleanly with my custom activation system on Cloudflare Workers.

I built VibeSonic's licensing server on Cloudflare Workers + D1 — it handles license activation, validation, and device management for 1000+ customers. Zero cold starts, global edge deployment, and it runs comfortably in the free tier. I evaluated Google Cloud, DigitalOcean, and AWS Lambda but Cloudflare was the only option where my entire backend costs under $5/month at this scale. R2 also handles CDN delivery of the app binary and 1-3GB Whisper model files with zero egress fees.