The business operating system for founders

Keep the business understandable.

See what needs attention today, find the record behind a decision, track upcoming obligations, and keep the way your business works out of scattered notes and apps.

5Line OS is currently in private preview. If you already have access, sign in with your 5Line Account.

The owner home starts with today's decisions, then leads into the company record behind them.

One path through the business

Capture it. Decide where it belongs.

Put loose work in the Owner Inbox, review it once, and file it into the right company record.

01
Capture what happened
Send a note, decision, receipt, document, idea, or follow-up to one owner Inbox without stopping to organize it first.
02
File it into the business
Turn reviewed items into real company records—ventures, files, procedures, marketing work, or business administration evidence.
03
Run the day from the record
Start with the owner review, see what needs attention, and open the exact place where the work belongs.
04
Work with an assistant from the same record
Choose what a connected assistant may use, keep uncertain or sensitive work in the owner Inbox for review, and use the Company Brief while direct access remains in private testing.

The record behind the work

Know where each part of the business lives.

Each area has a clear job, from company setup and daily decisions to obligations, procedures, marketing, and files.

Foundation

Define what the company is

Keep the operating brief, Business Stack, ventures, ownership context, and core company records together.

Daily work

Give every loose end a destination

Collect notes, decisions, receipts, and follow-ups in one Inbox, then file each item where it belongs.

Continuity

Preserve how the business runs

Maintain obligations, supporting evidence, procedures, run history, files, and Vault metadata without burying them in one long document.

Connected assistants

Keep help grounded in the business record

The 5Line OS connection lets a supported assistant search the company records you allow, read the current owner review, and prepare bounded proposals in the selected company. Governed documents, Runbook procedures, authority records, and assistant-role configurations become Governance Change Requests for owner review.

Built for the way founders actually work

Business memory you control—not another chat history.

5Line OS keeps structured, owner-approved business records separate from chat. It remembers what you deliberately save—not every conversation—and connected access is limited to the company information you allow.

Separate records and permissions for each company
Search and answers grounded in approved company records
Suggestions sent to the owner Inbox instead of written directly
Access tied to each person's 5Line Account
Existing Vault records and private working notes are not read

Direct connected access is in private testing and is not publicly available. ChatGPT is the current test target; Claude compatibility has not yet been verified. The Company Brief remains available as a manual fallback.

Plans that fit the business you have

Start small. Keep the same source of truth as you grow.

5Line OS is in private preview. Plans are shown for orientation, but public purchases are not open.

Starter

For a creator or focused side business.

Private preview

One company workspace
Owner Inbox, files, procedures, money, and marketing records
Assistant permissions and Company Brief fallback
Web, iPhone, and iPad availability planned for public release

Founder

For someone operating several ventures or companies.

Private preview

Up to three company workspaces
Everything in Starter
Multi-company operating views and exports
Founder-level setup and continuity tools

Public subscriptions are not open during the private preview.

Straight answers

What 5Line OS is—and is not.

Is 5Line OS a project manager?

It is broader than a project manager. 5Line OS organizes the business model, ventures, files, obligations, procedures, marketing records, owner decisions, and continuity work by company.

Does it put an AI assistant inside the app?

No. You keep using a supported assistant for the conversation. The 5Line OS connection lets a supported assistant search the company records you allow, read the current owner review, and prepare bounded proposals in the selected company. Governed documents, Runbook procedures, authority records, and assistant-role configurations become Governance Change Requests for owner review. Direct connected access is in private testing and is not publicly available. ChatGPT is the current test target; Claude compatibility has not yet been verified. The Company Brief remains available as a manual fallback.

Can I use it on desktop, iPhone, and iPad?

5Line OS is currently in private preview. Public availability for web, iPhone, and iPad has not opened.

Build a business another person can understand

Start with the business you run today.

Already have private-preview access? Sign in with your 5Line Account, or review the support guide.