Audiobook tool's 'use your subscription' pitch still needs a separate speech key
A new Show HN submission promotes audiobook creation through an existing AI subscription, while narration needs separate API credentials and may incur usage charges.
One audiobook, two ways of paying
A new Show HN post promotes PDF TO MP3 as a way to create audiobooks with an AI subscription a user already has. Its English setup page says a connected Codex or Claude assistant handles document processing through MCP. Narration is a separate step: users must supply an OpenAI or Gemini speech API key, which may incur provider charges. The product page discloses that split, even as its headline emphasizes using an existing subscription.
Why the pitch drew questions
In the October 13 Hacker News discussion, commenters challenged whether the submission title implied that the subscription covered the whole audiobook workflow. The creator replied that document processing uses the connected subscription, while text-to-speech requires a separate API key. That clarification resolves what the product says it charges for, but the public sources do not establish the total cost of a typical book or the quality of a completed recording. The news is the fresh community showcase and its billing debate, not a claim that narration is free.