How do I draw in isometric in JotJam?

Open a design, switch the grid to Isometric, and lines lock to the three iso axes.

What size are the blocks?

The massing box is 100 × 100 × 100 cm. The L-block has a 200 × 200 cm footprint with a 100 × 100 cm notch, 100 cm high. The gabled house is 200 × 300 cm with 250 cm walls and a 400 cm ridge.

No — they're drawings in isometric projection, ready to use in 2D drawings and diagrams.

Architecture symbols

Axonometric symbols

True isometric pieces that line up with each other, shaded with light from the left.

Axonometric or isometric?

An axonometric drawing shows a building in three dimensions without perspective: parallel lines stay parallel and sizes along each axis can be measured. Isometric is the most common kind, with the three axes 120° apart. These pieces are isometric, so they line up with the iso grid in the design tool.

What to use them for

Massing studies — stack and combine the box and the L-block to test building volumes.
Exploded and structure diagrams — the column-and-beam frame and the wall with an opening.
Room diagrams — the table, chair, bed and sofa, at their real sizes.
Scale — the person (175 cm) and the tree (about 360 cm), each with an isometric ground shadow.

Questions

How do I draw in isometric in JotJam?: Open a design, switch the grid to Isometric, and lines lock to the three iso axes.
What size are the blocks?: The massing box is 100 × 100 × 100 cm. The L-block has a 200 × 200 cm footprint with a 100 × 100 cm notch, 100 cm high. The gabled house is 200 × 300 cm with 250 cm walls and a 400 cm ridge.
Are they 3D models?: No — they're drawings in isometric projection, ready to use in 2D drawings and diagrams.