Synthesis.ml submits the user's resume along with the job application questions to the Google Gemini API service, so the LLM can answer the questions intelligently. The user's email and name are stored in synthesis.ml server's database for the purpose of tracking token usage. Payments are handled by the third-party payment processor, Paypal. Synthesis.ml does not use any data for any other purposes and does not sell any data to anyone else. The extension is not free because Google Gemini API costs money, but a free trial period is offered so users can try up to 10 form fills and/or resume and cover letter rewrites for free.