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Shared memory for people who use several agents: the options

If you use more than one agent, there are four kinds of option: the memory built into each app; a hosted memory several agents connect to, such as Hjarni, MemoryPlugin or Saudad; a developer memory engine, such as Mem0 or Supermemory; or a local server you run yourself, such as Basic Memory. Which fits depends on whether you want to just connect, to write notes, to build, or to run it yourself.

Updated Written by SaudadGuides

What we looked at

Saudad wrote this page, and Saudad is one of the options, so here is how we judged them, before the list: what each one is, who it suits, where your memory lives, and what it costs, each from the product’s own pages on the date beside its source. We don’t rank them; the right one depends on what you want to do.

The options

Each option in its maker’s words where we quote them, prices as their pages list them.
FeatureWhat it isSuitsWhere your memory livesPrice
Built-in memory (Claude, ChatGPT and others)[1][2]Each app’s own memoryPeople who use one appInside each appIncluded
Hjarni[3][4]A hosted Markdown knowledge base with an official serverPeople who want to write and organise notes themselvesHostedFree up to 25 notes; Pro €11 a month
MemoryPlugin[5][6]One memory across “21+ AI tools”, in its own words, through a browser extension and a hosted serverPeople who want memory inside chat apps that don’t connect to serversHosted, with a local optionCurrently Core $89 a year and Pro $180 a year, billed annually
SaudadOne private memory your agents connect to, organised into spacesPeople who use several agents and don’t want to run anythingHostedThe Personal plan, after a free trial with no card
Mem0[7][8]A memory layer for agents, managed or self-hostedDevelopers adding memory to their own appHosted, or self-hosted from its open-source coreFree and custom plans
Supermemory[9][10][11]A memory engine for agents, through an API, plugins and a hosted serverDevelopers building memory into their own agents or appsHosted, or on your machine from its open-source releaseFree with $5 of credits a month; paid plans from $19 a month
Basic Memory[12][13]A knowledge graph in plain Markdown filesPeople who want their memory as files they own and editYour computer, with optional cloud syncFree on your machine; cloud sync from $15 per seat a month
The MCP reference memory server[14]A basic local knowledge graph in one fileDevelopers learning how memory servers workYour computerFree

Which kind fits

Built-in memory, if…

  • You use one app, most of the time.
  • You want nothing to set up or pay for.

A hosted memory, if…

  • You use several agents, on more than one computer.
  • You want to connect them and get on with your work.

A developer engine, if…

  • You’re building memory into your own agent or app.
  • You want an API and SDKs, or to self-host the engine.

A local server, if…

  • You want everything on your own computer, as files you own.
  • Your agents run on that computer and can reach a local server.

Where Saudad fits

Saudad is a hosted memory for people, not a developer engine: you sign in with a code, paste one address into each agent, and your agents fill it as you work. It’s organised into spaces, such as one per client or project, and every memory shows its space and the app that saved it. It works with Claude, Claude Code, Codex, Cursor, OpenClaw and other apps, and ChatGPT on its Business, Enterprise and Edu plans (read-only on Pro).

It isn’t open source, it doesn’t run on your own computer, and it has no browser extension: if you need any of those, one of the others suits you better.

Questions

Why trust a list written by Saudad?

Don’t take it on trust: every fact about another product links that product’s own page, with the date we read it. We’ve put Saudad where it fits, with what it doesn’t do, and we don’t rank the options.

Is ChatGPT’s or Claude’s built-in memory enough?

If you use one of them most of the time, often yes. Each keeps its memory inside its own app, so it stops being enough once you use a second agent.

What does Saudad cost?

€9 a month billed yearly, or €12 monthly, VAT included, after a 14-day free trial with no card.

Sources

  1. 1.Claude’s memory and searching past chats · Anthropic Help Center · checked 28 October 2026
  2. 2.Memory in ChatGPT · OpenAI Help Center · checked 19 September 2026
  3. 3.Hjarni (llms.txt) · Hjarni · checked 28 October 2026
  4. 4.Pricing · Hjarni · checked 28 October 2026
  5. 5.MemoryPlugin · MemoryPlugin · checked 28 October 2026
  6. 6.Remote MCP server · MemoryPlugin Help · checked 28 October 2026
  7. 7.Mem0 documentation index · Mem0 · checked 28 October 2026
  8. 8.Pricing · Mem0 · checked 28 October 2026
  9. 9.Supermemory · Supermemory · checked 28 October 2026
  10. 10.Pricing · Supermemory · checked 28 October 2026
  11. 11.supermemoryai/supermemory · GitHub · checked 28 October 2026
  12. 12.Basic Memory · Basic Machines · checked 28 October 2026
  13. 13.Pricing · Basic Machines · checked 28 October 2026
  14. 14.Knowledge graph memory server · Model Context Protocol, reference servers · checked 28 October 2026

Changes to this page

  • : First published.

Saudad wrote this page and has tried to be fair to every product in it. Each fact about another product links its source, read on the date beside it.

Give every agent the same brain.

Saudad is one private memory that Claude and your other agents share. Paste one address into each agent you use.

See how to connectSee pricing