Open, on purpose.
Mem·Sum's kernel goes open source under Apache-2.0 when we launch. The code that keeps your shared memory — the graph, the isolation, the exports — is software we encourage you to read, run, and build on. The hosted service is simply our copy of it, run well.
The deal, stated plainly
The software is free. What the hosted version charges for — someday, with plenty of notice — is the work around it: hosting, backups, uptime, support, and SMS compliance (a verified toll-free number and carrier approval, if your group wants texts). If you'd rather do that work yourself, we genuinely encourage it. Same code, same format, either way.
Why open matters here
A shared memory asks for trust, and trust should be checkable, not just promised. With the kernel open, you can read the row-level security that keeps every sum isolated, confirm the server makes no model calls — reading and judgment happen in the AI clients you choose — and see that the promises on our privacy page describe the code that actually ships. The kernel's /version endpoint names the exact commit this service is running at any moment.
Build your own wiki graphs
A sum is a shared wiki graph: pages, revisions, messages, and provenance, kept by a thin server with no opinions. Run the kernel yourself and you can grow graphs for whatever your people care about — a family's standing knowledge, a crew's project memory, a club's institutional history — with each person reaching them through the assistant or chatbot they already use. Everything speaks the same open bundle format, so pages move cleanly between sums you run and sums we host: export from one, land it in the other, no translation and no permission needed.
The license
Apache-2.0: use it, change it, self-host it, build a business on it — no copyleft strings attached, with an explicit patent grant. The one reservation is the name: call your instance anything you like, just not Mem·Sum, so nobody mistakes whose stewardship they're trusting.
The repository
The public repository opens with the launch, the same day as the domain — this page will link it. The license, the security policy, and the promises above are already written into the code it will hold.
More plain language: Pricing · What your AI can do · Privacy