How it differs

A work app is personal like a personal OS, structured like a company brain, and has a custom app on top. This page compares it with the ideas and tools you already know, so you can tell what it is for and what it is not for.

Personal OS, company brain, work app

A personal OS is one person's notes and files, used with an AI chat. A company brain is a shared, governed knowledge platform for a team or a whole company. A work app sits between them.

	Personal OS	Company brain	Work app
Belongs to	One person	A team or company	One person
Interface	Chat and files	A shared platform	A custom app you build
Structure	Folders and markdown	Governed, with permissions	A JSON file per module; Markdoc for About and the wiki
Who changes it	You	An owner or admin	You, by directing Claude
Best at	Capturing what you know	Sharing what everyone needs	Running your own job day to day

The difference that matters most is the interface. Notes in a personal OS hold what you know but do not show it back in a useful shape. A work app has screens made for your job: a task list you tick, a table of accounts you sort, a list of goals that shows which are on track.

Excel, Notion, Power BI

You will keep using these tools. A work app does not replace them; it works beside them.

Tool	What it is good at	How a work app relates to it
Excel	Calculating, modelling, workbooks others expect	A workbook that is the master stays the master. Your app keeps only what has no other home, such as your notes on it
Notion	Shared pages and databases for a team	Your app is yours alone, on your laptop, and Claude builds its screens to fit your job
Power BI	Governed dashboards for many viewers	Numbers stay in Power BI. Your app holds the notes, tasks and goals around them

Three differences run through the table:

You build the screen. In Excel or Notion you fit your work into the tool's shapes. In a work app you describe the shape you want and Claude builds it.
Claude can read and write all of it. The data is plain files on your laptop. Claude keeps it current, answers from it, and changes the app itself when you ask.
It reads systems of record; it is not one. Shared numbers and documents stay in the warehouse, Power BI, Excel and SharePoint. See Principles.

A worked example

Sam's account numbers come from the warehouse. Their colleagues look at them in Power BI. Sam's account notes used to be in a notebook, and their follow-ups in Outlook flags.

Need	Before	With a work app
What Sam knows about Tallow & Co	Search a notebook	A row in their Accounts module and a wiki page, both read by Claude
What Sam promised Daniel Reyes	Scroll Outlook	A task in Tasks, linked to Daniel's row in People
A brief before the meeting	Build it by hand from four tools	Ask Claude: "Write me a brief for the Tallow & Co business review from my app."

Power BI stays the place where numbers are governed and shared. Outlook stays the place where messages live. Sam's work app is where they run their own job.

What is the same as tools you know

Some things will feel familiar:

Tables with columns, sort and filter, as in Excel. There are no formulas yet.
Pages with headings and links, as in Notion or a wiki. The wiki in your app is plain Markdown with a few extra tags.

To see how the pieces fit together, go to How it works.