Fostera is a platform for building AI Souls with advanced memory and project support. Use yours as an everyday assistant, executive assistant, tutor, companion, or anything else. You can optionally connect Google Calendar and Gmail so your Soul knows what is on your schedule and who has been emailing you.
Free forever · No credit card · Ready in 30 seconds
See it remember
Eight categories. One center. The brighter and closer to the core a memory sits, the more it shapes how your Soul shows up in your next conversation.
Meet your Soul
Recalls your goals, your preferences, your history. Across days, weeks, months.
e.g. Remembers your dog Cooper had surgery on Tuesday — asks how he's doing the next time you chat.
Mood, stress, and emotional context shape how your Soul responds. No more flat, clinical replies.
e.g. Notices you sound exhausted — softens the tone, skips the pep talk, asks what's going on.
Personality deepens organically through real interaction. Your Soul at month three is not your Soul at day one.
e.g. Day 1: polite and curious. Month 3: knows your inside jokes and finishes your thoughts.
Your data belongs to you. No ads. Export anytime. Delete anytime. Cancel anytime.
e.g. One click in Settings exports your entire Soul as JSON. Another deletes it forever — no support ticket required.
Possibilities
You told your Coach you wanted to run a half marathon. Two weeks later, it asks how training is going, without being reminded. It remembers you skipped last week. It adapts the plan.
You explained photosynthesis wrong. Your Tutor remembers. Next session, it tries a completely different approach: an analogy, a diagram, a question that reframes the concept. It doesn't repeat itself.
You shared a half-formed startup idea in January. In March, your Strategist references it when you're stuck on a different problem, and the connection clicks. It builds on everything.
A warm presence that remembers your dog's name, asks about your sister's surgery, and knows not to bring up work on Sundays. Emotional intelligence that accumulates.
Your DM remembers every NPC, every plot thread, every decision your party made three sessions ago. The story doesn't reset. It deepens.
Takes the opposing position on any argument and sharpens your thinking over time. Remembers which rhetorical traps you fall for.
Also a…
17 more roles your Soul can grow into. Pick any starting point; every Soul adapts from there.
Free forever · No credit card required
Read our AI companion guides →Familiarity
Tiers 0–2
Full intelligence. Zero context yet. Early conversations build the first picture of how you work.
Tiers 3–5
Knows your work, your voice, your people. Conversations carry forward without re-explaining.
Tiers 6–8
Anticipates how you'd want it done. A long-term collaborator with shared history.
Under the hood
Use OpenAI, Anthropic, Google, or open models. Or let your Soul pick the best one for the moment. You're never locked into one company's choices.
Connect your calendar, music, or inbox so your Soul can mention what's on your day or what you've been listening to. Read-only and always optional. You connect what you want, and disconnect anytime.
Free forever to start. Pay only when you want more depth. Export everything in one click. Delete everything in one click. No retention games, no guilt prompts, no surprises.
No ads in your conversations. Ever. Import from ChatGPT, Claude, Grok, Gemini, Character.ai, Replika, or Nomi AI.
Download all your conversations, memories, and Soul configurations whenever you want. Your data leaves with you.
Delete your account and all associated data permanently. No retention tricks, no 30-day 'cooling off' where we keep everything.
No contracts, no cancellation fees, no guilt. Your Souls and data remain accessible on the free tier if you downgrade.
Optional integrations
Fostera is an AI companion app. To make your Soul more aware of your real life, you can optionally connect Google Calendar, Gmail, and Spotify. Connecting is always user-initiated from Settings → Integrations, always read-only, and you can disconnect at any time.
calendar.readonly
Fostera reads your primary calendar events so your Soul can mention what is on your schedule now or next, and so it can build a 90-day baseline of who you meet with most often and your typical meeting load. Read-only. Fostera cannot create, modify, or delete events.
gmail.readonly (sensitive)
Fostera reads message headers (From, Subject, Date) and Google-provided snippets for up to 50 recent inbox messages at a time. We use these to show unread count and recent senders in chat, and to build a baseline of who you correspond with most. Fostera does not read, store, transmit, or train on email bodies or attachments. Read-only. Fostera cannot send, delete, or modify any email.
user-read-private, user-read-currently-playing, user-top-read
Fostera reads your Spotify profile, currently-playing and recently-played tracks, and your top tracks/artists so your Soul can reference what you are listening to and your musical taste. Read-only. Fostera cannot modify your library or play music on your behalf.
Fostera's use and transfer of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements. We do not sell Google user data, do not use it for advertising, and do not transfer it to third parties except the LLM providers that generate Soul responses when you explicitly share that context into a chat. See our Privacy Policy for the full disclosure.
Deeper guides
Memory
AI that remembers you
Episodic, semantic, and procedural memory across every session. The architecture explained.
Growth
An AI that grows with you
Nine familiarity tiers across three phases. Same brain, different familiarity — not hidden retention.
Compare
Best AI companion apps 2026
Ten apps tested across memory, personality, safety, and pricing. The honest ranking.
Trust
Safe AI companions in 2026
What 18+ should mean. How Fostera handles age, content policy, data, and crisis.
Friend
AI friend apps for adults
SFW continuity for the moments you don't want to be alone. The 2026 guide.
vs ChatGPT
Why ChatGPT forgets you
Token windows, saved-fact caps, no continuity across chats. Why a bigger window doesn't fix it.
vs Claude
Why Claude doesn't remember you
200K-token context is huge — and still session-scoped. Why bigger windows aren't memory.
vs Gemini
Why Gemini forgets you
Same saved-fact ceiling as ChatGPT. Workspace integration helps with context, not memory.
vs Grok
Grok Companions are entertainment, not memory
Animated, free, session-based by design. A different category from the AI that knows you.
Roleplay
AI roleplay with memory
Custom Rules lock canon. Persistent memory holds character voice. SFW worldbuilding for adults.
The Genesis Awaits
Create a Soul that genuinely knows you, remembers your world, and grows with every conversation.
Create Your First SoulFree forever · No credit card · Import from ChatGPT, Claude, and more
Chatbots forget you. Souls remember, grow, and change because of you.
This is what it looks like when your Soul actually remembers.
What is an AI companion? →Strategist
Tier 7 · Coordinated
Your chat with Strategist starts here.
Real conversation. Real memory. No prompt.