Noterat

Rev. 1.1  /  iPhone & iPad

Think on paper.
Solve it on the same page.

Noterat puts handwriting, technical drawings and real symbolic maths on one sheet — so the sketch, the reasoning and the answer never end up in three different apps.

Download on theApp Store

iOS 26 · iPadOS 26 · English & Svenska

Noterat on iPad: a SymPy worksheet with symbolic integration, a deflection plot and a unit conversion.
Handwritten notes titled Think on paper in Noterat on iPhone.

Fig. 01

Think in ink.

Write and sketch with Apple Pencil the way you would on paper. Pens, highlighters, shapes and text, and a strip of tape to hide a line until you want to see it again.

Erase
Scribble over a word and it's gone — one undo step.
Snap
Freehand right triangles snap to exactly 90°. Near-level boxes straighten themselves.
Bend
Turn a straight stroke into a parabola, or hang it as a rope of a given length.
Search
Find words in your handwriting, typed text and imported PDFs.
Handwritten engineering notes in Noterat: a cantilever sketch, the bending equation and a list of assumptions.
Fig. 01 — Cantilever study. Every stroke is editable PencilKit ink.

Fig. 02

Solve with SymPy.

A real computer-algebra system sits inside the page. Integrate, differentiate, solve systems, work with matrices and plot — exactly or numerically, with units that follow the maths all the way to the answer.

# units are part of the number
2[m] + 30[cm]               = 2.3 m
12[m/s] * 3[s]              = 36 m
convert(10[m/s], [km/h])    = 36 km/h

Everything runs on the device. No connection, no server — the engine ships with the app.

A SymPy worksheet in Noterat on iPhone: symbolic integration, a deflection plot and a unit conversion giving 1.35 mm.
Fig. 02 — Cantilever, end load. δ = 1.35 mm, computed by the app's own engine.

Fig. 02a — try it

Push the beam.

The same steel cantilever as Fig. 02 — 50 × 100 mm, E = 200 GPa. Move the load or the length and watch the tip move. In Noterat you'd write this yourself; here we did the typing.

P = 1.0 kN L = 1.50 m

δ = P·L³ / (3·E·I)

δ = 1.35 mm

I = b·h³/12 = 416.67 cm⁴ · bend exaggerated so you can see it

Fig. 03

Draw to the millimetre.

Create, import and edit 2D CAD drawings in DXF, with coordinates, snapping and layers. Then drop the drawing into your notes at the scale you choose and export it back out for any other CAD program.

DXF
Open, edit and export — nothing gets trapped in the app.
3D
Lasso a closed profile — a tube, an I-beam — and extrude it into a body you can turn.
Scale
Dimensions in the ruler's unit, bodies at the ink's scale.
A dimensioned mounting plate drawn in Noterat's DXF editor, with a side elevation.
Fig. 03 — Mounting plate MP-016, rev A. 160 × 100 × 12 mm.

Contents

…and the small things that add up

  1. Tabs & split view04

    Notebooks, Markdown and drawings open side by side on iPad.

  2. Page headers & courses09

    Name, date and course code on every page — exported as real text.

  3. Colour & fill13

    Palette presets, an eyedropper, and drag-to-fill for closed shapes.

  4. LaTeX out17

    Copy calculation cells as LaTeX, in reading order, with answers.

  5. PDF in, PDF out22

    Annotate imported PDFs; export any notebook as a PDF.

  6. A desk around the paper26

    Twelve pastel themes — or a dark desk lit by flickering candles.

  7. iCloud sync31

    iPhone and iPad in step, through your own private iCloud.

  8. Two languages35

    English and Svenska, following your device.

No account.
No ads.
No tracking.
Your notes are yours.

Appendix A

Nobody reads over your shoulder.

Noterat has no sign-in and no server of ours. There isn't a single analytics, advertising or tracking SDK in the app. Your notebooks live on your device — and, if you turn on sync, in your own private iCloud.

Read the privacy policy — it's written to be read.

Give your ideas room
to take shape.

Free on the App Store for iPhone and iPad.

Download on theApp Store