Notes with depth.

Notes that show what you don't know yet.

Sophiastra is a note app where you build your thinking in 2D and explore it in 3D. For Mac, Windows and the browser.
Like wisdom (sophia) piling up in layers of rock (strata), your notes stack up level by level.

Download for free Mac · WindowsTry it in your browser No install
The browser version has the same features as the download version. The only difference: what you write is not saved.
No ads, no sign-up. Your data is saved only on your own computer.
Sophiastra in English: topics laid out on a 3D map, with the level below showing faintly underneath
Build in 2D

Put a question on each row,
and the gaps in your understanding appear.

In 2D, topics are arranged from top to bottom like a pyramid. The strip on the left lets you give each row a role.

Phrase the roles as questions like "Why?" or "For example?", and every empty row becomes a clear sign of "what I don't understand yet".

What don't I understand?In a word?Why?For example?What's still unclear?

Row patterns you use often can be added in one go from a template.

2D view: row roles in the left strip, topics arranged as a pyramid on the right
Explore in 3D

Levels stacked on top of each other
lead you to unexpected connections.

In 3D, the level you're looking at is shown clearly, with the level below faintly visible underneath.

2D for organizing, 3D for inspiration. Switch between them with one button, on the same notes.

The 3D view seen at an angle
Keep writing

Inside each topic, it's like a chat.

Inside every topic, keep writing notes as chat-like bubbles. When a subject grows too big, take it down a level; when the talk drifts, move it sideways.

Notes

What happened and what you thought, as bubbles in time order. You can also read them straight through like a book.

Sideways

Other subjects at the same level. Lay them out on the map and connect them with lines.

Down

The content of that topic. Stack as many levels as you like.

Privacy

Your thoughts stay on your computer.

Nothing sent online

What you write is saved only on your computer. No account needed.

Daily backups

A backup is saved automatically once a day (30 days kept). Deleted topics can be restored for 30 days.

Free, no ads

The core features are free. No ads.

Sophiastra Demo 0.4.6

For Mac and Windows · Free

Mac 0.4.6 .dmg · about 8 MB Windows 0.4.6 (beta) .zip · about 13 MB
MacmacOS 14 Sonoma or later
Mac with Apple silicon (M1 or later)
Macs with Intel processors are not supported
WindowsWindows 10 / 11 (64-bit)
Requires Microsoft Edge WebView2 (included in Windows 11 and most Windows 10 PCs)
BrowserLatest Chrome, Edge, Safari or Firefox
No install. What you write is not saved

The app starts in English when your Mac or PC is set to a language other than Japanese. You can switch between English and 日本語 anytime from the ⋯ menu.
Want to try before downloading? Use the browser version (same features, nothing is saved).
The demo version does not include AI features.
On Windows, right-click the zip → "Extract All" first, then open Sophiastra.exe in the extracted folder (it won't run from inside the zip). If "Windows protected your PC" appears the first time, click "More info" → "Run anyway".

Installing

Download it and open it right away.

The Mac app is signed and notarized by Apple.

  1. Open the downloaded .dmg and drag Sophiastra into the "Applications" folder.
  2. Double-click Sophiastra in the Applications folder.The first time, macOS says it was downloaded from the internet. Just press "Open".