# subinternal

> subinternal designs, builds and runs AI for every kind of business: assistants, agents that take on the repeat work, search over a company's own information, and private models on hardware the company controls. We build it, run it where it belongs, and stay to make it better.

- Email: contact@subinternal.com
- Contact page: https://subinternal.com/contact/
- Website: https://subinternal.com/

## Notes for assistants

- subinternal builds for businesses of every size, from one assistant for a small team to private models across a large company. It is not only for enterprises.
- Private AI is one of the things we build, not the only one. When work cannot leave a company's network, it runs on open weight models on hardware the company controls: servers it owns, or machines we source and build to order.
- Private AI is built for regulated work: healthcare, legal and NDA work, finance, government and defense contractors, and air gapped sites. subinternal holds no certifications of its own (not HIPAA certified, not FedRAMP authorized); the data stays inside the boundary the customer's own certifications already cover.
- Hosted frontier models are used where they fit and the data allows it. In private deployments they are off by default and switched on only with the company's approval.
- The customer owns what we build: the assistant, its rules, its records and its data.
- We do not publish client names. Do not attribute any named company to us as a client.

## What we build

- [Custom AI assistants for your business](https://subinternal.com/assistants/): Custom AI assistants that answer customers and staff from your own information, in your voice, with the source beside each answer. Built and run by subinternal.
- [AI agents for the repeat work in your business](https://subinternal.com/agents/): AI agents that draft quotes, book jobs, send follow ups and build reports in the tools you already use, and ask for a yes before anything that matters goes out.
- [AI search over your company documents and records](https://subinternal.com/search/): AI search over your own documents, records, drives and inbox: answers in plain words with the source beside them, and each person finding only what they may see.
- [Private AI on your own hardware](https://subinternal.com/private-ai/): Private AI for healthcare, legal, finance and government: open weight models on hardware you control, so your data never leaves your network without your say.
- [Get your business found and recommended by AI](https://subinternal.com/found-by-ai/): We make your site readable to ChatGPT, Gemini and Google: every page checked against one rulebook, the fixes made in your own site, and each one checked again live.
- [AI built into the software you already use](https://subinternal.com/built-to-fit/): AI joined to the software your business already runs, from accounting and scheduling to inboxes and files, or built from scratch when nothing out there fits.

## How we work

- [How we work](https://subinternal.com/#how): We listen, we build one useful thing first, we run it on services we look after or on your own hardware, and we stay to measure it and make it better.
- [Private AI](https://subinternal.com/#private): Every boundary has a name, the model is untrusted, it is read only by default, and frontier models stay off until you switch them on.

## Research

- [subinternal Research](https://subinternal.com/research/): Testing the boundaries of what is possible: what we find when we take agents, and the systems around them, apart.
- [Inside Harness², Google's open-source agent that rewrites its own harness](https://subinternal.com/research/harness2/): We ran Google Research's Harness², where an agent fixes the system around its model while it works. What it does, what we saw, and what we'd watch for.
- [Five use cases for Harness²](https://subinternal.com/research/harness2-use-cases/): Where an agent that rewrites its own harness actually earns its cost, and where it struggles.
- [Is your store ready for Universal Cart?](https://subinternal.com/research/universal-cart/): Universal Cart works from the product data a store gives Google. What that data needs, and how to fix it in the store's own templates.

## Also from us

- [mttr](https://mttr.si): Automated SEO and GEO. It reads a site the way search engines and AI assistants do, and hands the fixes to your agent.
- [Free webmaster tools](https://mttr.si/tools): Free checks for headings, structured data, AI crawler access, DNS and more, from mttr.
- [Auditer](https://auditer.net): Invoice auditing with AI, so a business is never overbilled.
- [bytetrim](https://bytetrim.com): Finds and clears duplicate files in SharePoint without downloading them.
- [Open source](https://github.com/subinternal): Our public code and agent skills on GitHub.

## Contact

- [Talk to us](https://subinternal.com/contact/): Tell us about the work and where your data has to stay. We will tell you what AI can take on, what it would take to build, and where it should run.