---
title: FAQ
description: Common questions about openmemory - cost, accounts, keys, data, dreaming, and self-hosting.
---

## Are there limits?

Yes. The hosted service has per-space limits (see [Limits](/docs/limits)). There is no SLA.

## Do I need an account?

No. `POST https://api.openmemory.sh/v1/spaces` returns a space id and a key. The key is the only credential.

## I lost my key. Can I get it back?

No. Only a hash of the key is stored. Create a new space. The old one is deleted after 90 days without use.

## Can I rotate a key?

Not in place. Export the space (`GET /v1/export`), create a new space, write the data you need into it, and delete the old space (`DELETE /v1/space`).

## MCP or REST?

Use MCP when your agent runs in a client that supports it (Claude Code, Cursor, Codex, the OpenAI Agents SDK). Use REST for your own code, scheduled jobs, and atomic batch writes, which are REST-only.

## How is this different from a vector store?

Recall uses both: full-text search and embeddings, merged into one ranking. The facts live in a database, not in the vector index. The index holds only embeddings tagged with a space id, and if it is unavailable, recall falls back to words. Next to the facts, openmemory has a journal, typed records, an approval ledger with compare-and-set transitions, KV, an event log, and nightly dreaming that consolidates memory without touching what the user stated. See [Concepts](/docs/concepts).

## Does dreaming send my data to a model?

In `client` mode (the default), the service hands the job to your agent, which runs it on your own model. Nothing goes to a model from the service side. In `server` mode, the service runs the job on Cloudflare Workers AI. With `off`, nothing runs on a schedule. See [Dreaming](/docs/dreaming).

## Can dreaming change what I told the agent?

No. Facts with origin `user` and pinned facts are never rewritten, merged away, or demoted. Every dream can be undone for 7 days.

## How do I delete something for good?

Use `forget` with `dry_run` first, then without it. It hard-deletes and leaves only content-free tombstones. `DELETE /v1/space` removes everything. See [Forget and privacy](/docs/forget-and-privacy).

## Does search work in my language?

Word search works in any script: it folds case and accents, so café matches cafe, and words match as prefixes. Meaning search uses an English embedding model, so it works best in English; in other languages, rely on words.

## Can several agents share a space?

Yes, if they share the key. Actions, records, and KV have compare-and-set operations, so concurrent agents do not overwrite each other or execute the same action twice.

## Can I self-host?

Yes, on Node.js 22.18+ with built-in SQLite, or on your own Cloudflare account with Workers and D1. See [Self-hosting](/docs/self-hosting).