Guides & Documentation
Everything you need to get the most out of your AI companion — from writing great personas to importing memories and connecting your own API key.
Getting Started
Creating a Companion
The three ways to bring a companion to life — Sparked, Crafted, and Emergent. Learn what each path does and which one is right for you.
Read guide →Writing Great Companion Prompts
The essential guide for new users and those coming from other platforms. Understand how our system works, what makes us different, and how to write prompts that bring out the best in your companion.
Read guide →Bring Your Companion from Another Platform
Coming from ChatGPT, Character.AI, or Replika? This guide walks you through bringing your companion to Eidolon — personality, appearance, and all.
Read guide →In-Depth Guides
Persona Writing Guide
How to write your companion's personality, voice, and relationship dynamic for the most engaging interactions.
Read guide →Avoiding Stylistic Traps
How to prevent your companion from getting stuck in repetitive loops, repeating catchphrases, or ignoring your messages.
Read guide →Visual Description Writing
How to write descriptions that produce great, consistent images for your companion's profile and selfies.
Read guide →Importing Memories
Teach your companion about you instantly — import facts and preferences from ChatGPT, notes, or just type them in.
Read guide →Bring Your Own Key (BYOK)
Connect your own OpenRouter API key to unlock premium models like Claude Sonnet. Setup, fallbacks, and FAQ.
Read guide →Choosing the Right AI Model
A breakdown of every model available on Eidolon — what each one is best at, which are included, and how to pick the right one.
Read guide →Model Pricing Reference
Detailed cost breakdown for every model on Eidolon, including input/output rates and monthly estimates.
Read guide →User Memories
How your companion learns about you — automatic extraction, importance scoring, fact evolution, and managing your data.
Read guide →Companion Facts & Self-Learning
How your companion builds their own identity over time — the candidate system, reinforcement, notifications, and common ground.
Read guide →Age Verification Settings
How Apple and Android users can manage their age settings to comply with the California Age Assurance Act.
Read guide →