penloft.

Your pen.
Your space.

3D modeling for
Android tablets.

Draw a line. Pull it into a wall. Model with the pen already in your hand.

In development · Android + S Pen

Try the prototype

For interiors, spaces & objects.
Being built by a solo founder in Istanbul.

Interactive room previewLive 3D
ROOM + DOORMETERS
3.20 m 0.90 m
01 / 04Draw the footprint

Drag to orbit · scroll to zoom

Illustrative 3D preview, not the CAD editor. See the real prototype below.

Not just a concept.
A model you can make.

The current prototype: draw a profile, enter exact dimensions, pull a solid and export an STL.

Try the prototype
Actual Penloft prototype: extruded solid, Push/Pull tool and on-screen dimension keypad with meter and millimeter units.
From dimensions to a solid. The real on-screen keypad.
Actual Penloft prototype with a 3D solid and the confirmation message Exported STL.
Out of the canvas. A successful STL export.

Real prototype, tablet emulation, 8 Oct 2026. Export verified on a 2 × 3 × 2.7 m watertight solid. Not a physical S Pen device test.

Inspect the open-source prototype
From the first line to the first walkthrough.Explore the workflow

Think in lines.
Work in volumes.

Draw. Measure. Pull. Open.
Illustrative workflow. The current prototype draws and extrudes solids.

01

Draw the footprint.

Draw a closed rectangle. Start with the footprint of your space.

A pen drawing a rectangular footprint in perspectiveCLOSED PROFILE
02

Make it exact.

Type 3.20 m or 3200 mm. Give your drawing an exact dimension.

A 3.20 meter dimension with an on-screen numeric keypad3.20 mLENGTH / m3.20789456123
03

Pull it into a wall.

Lift a face into a volume. Turn it around and inspect it.

A flat profile lifted to become a clay-colored wallPUSH / PULL
04

Open the space.

Cut an opening. Orbit to see the room come together.

A three-dimensional wall with a 90 centimeter doorway cut through it0.90 mSPACE, NOT JUST SURFACES

The pen makes.
The hand moves.

Two kinds of input.
One uninterrupted train of thought.

Tablet input map: pen for geometry, one finger to orbit, two fingers to pan and pinch to zoomPENONE FINGERTWO FINGERS
S Pen
Draw, select, push & pull.Geometry follows the pen.
One finger
Orbit the model.Look around without changing tools.
Two fingers
Pan & pinch to zoom.Find the detail. Keep your place.

Pen/touch input separation and palm rejection are implemented in the prototype. Real S Pen hardware testing is still ahead.

A good pen.
A capable tablet.
Why stop at 2D?

Penloft starts with the Android tablet you already use, and the spaces you want to make.

Pen-first modeling shouldn't
require an iPad.

SketchUp for iPad and Shapr3D bring modeling to tablets, but not Android. Penloft focuses on that missing pen-first workflow.

SketchUp for iPad iPadOS
Shapr3D No Android support

SketchUp retired its Android Viewer on 29 August 2025. It was a viewer, not a modeling editor. Read the notice.

Other 3D tools exist on Android. Our focus is narrower: a stylus-first, measured push/pull workflow. Platform sources checked 8 October 2026.

New ways to draw.
Open roots.

Built on Hew, the open-source solids modeler. Penloft adds a pen-and-touch workflow; the geometry foundation is Hew's work.

Explore Hew on GitHub

Hew: GNU AGPL-3.0-only, with the Hew Plugin API Exception. Penloft's derived core must respect those terms. This page's 3D demo uses Three.js, not the Hew kernel.

What's being built

Next validation
Android + S Pen hardware testing. Tablet emulation is verified; real-device validation is ahead.
Working now
Measured push/pull, touch navigation, STL export and offline PWA. glTF and 3MF are planned.
Further ahead
Conversational editing with Claude.
“Make this wall 3.2 m.
Add a 90 cm door.”
Planned. Not connected or shipping yet.

Bring your next
space to the table.

Work on interiors, rooms or objects with an Android tablet? Help shape what Penloft becomes.

Early development. Open conversation.

Request early access

Opens your email app. No waitlist counter.
No launch date promised.