Personal operating system

A personal principles app for decisions you want to repeat.

Principium helps you turn scattered lessons, values, and standards into personal principles you can find, refine, and apply when choices get noisy.

See the app

From values to usable rules

Most values are too broad to guide a Tuesday afternoon decision. Principium helps you convert them into short principles with context, examples, and visual anchors.

Capture a lesson while it is still sharp.
Rewrite it as a decision rule you can act on.
Group related principles by work, health, relationships, or focus.

Designed for returning, not just writing

The product workflow is built around returning to your principles, improving them, and making them memorable enough to show up in real life.

Use images and layouts as memory cues.
Review principles before recurring situations.
Keep older versions clear instead of losing context in a notes app.

Principium workflow

A concrete flow for moving from reflection to something you can use before the next decision.

01 Write the raw thought: “I overcommit when I answer immediately.”
02 Shape it into a principle: “Pause before saying yes to new work.”
03 Add a concrete trigger: “When a request arrives after 4 PM, decide tomorrow.”
04 Review it before planning your week.

Examples

Principium works best when broad intentions become short rules connected to real situations.

Focus

Before: I should stop checking messages so much.

Messages wait until the first deep-work block is complete.

Health

Before: I want more energy.

Protect sleep before optimizing anything else.

Read the guides Explore the productivity system