AfiniTwin

Use cases

Four real ways to use the AfiniTwin daily. Composite characters. Any resemblance to real persons is coincidental. (Closed decision 2026-05-10: public cases with marked fictional characters, no real testimonials in Phase 1.)

Ana — the direct consultant

Mi Afini Standard in Claude Projects

  1. Ana downloads the .md of the Standard preset in Spanish.
  2. Creates a Claude Project named "Mi Afini Standard" and pastes the Project instructions.
  3. Uses it for daily conversations: planning, drafting, reviewing client proposals.
  4. Activates Voice mode when she needs sign-able drafts ("write this for me").
  5. Activates Analyst mode when a client asks about psychometric validity of a test their company uses ("give me the technical analysis of my Big Five").
  6. After the second quarter, repurchases Twin with updated data.

Pablo — the ghostwriter of himself

Mi Afini Ghostwriter in ChatGPT Custom GPT

  1. Pablo downloads the .txt of the Ghostwriter preset.
  2. Creates a Custom GPT called "Me, writing".
  3. Pastes the content in Instructions.
  4. Uses it to reply to long professional emails: Pablo provides the idea, the GPT turns it into sign-able text that sounds like him.
  5. Doesn't use it for intimate messages (he writes those).
  6. If the GPT inserts a verbal tic Pablo does not use, he gives feedback: "no, that word is not mine".

Marta — the reflective decision-maker

Mi Afini Critic in Gemini

  1. Marta downloads the .md of the Critic preset after reading and accepting Appendix B.3 disclaimer.
  2. Creates a Gem called "The other side".
  3. Activates it when she has an important professional or personal decision on her mind.
  4. She pastes the argument in favor of the decision and asks for critic mode.
  5. The Gem returns the best possible refutation. If Marta still thinks the same after, she's more confident. If not, she delays the decision.
  6. Does NOT use it when tired or emotionally loaded — Appendix B.3 advises against.

Hugo — the technical user

Full JSON via Anthropic API

  1. Hugo is a developer. Downloads the full JSON with opt-in narratives only for professional context.
  2. Loads it in his personal agent via Anthropic's direct API.
  3. Leverages prompt caching: the system prompt is cached across turns, cheapening cost.
  4. Combines with his own tools to make the agent help him code while keeping his technical voice.
  5. When he repurchases Twin, he runs a git diff between the two JSONs to see how his profile changed.
AfiniTwin — Use cases (fictional characters)