- Is Size Sim free?
- Yes. The 2D height comparison chart is completely free and needs no account. The first-person 3D sandbox is in alpha and available for everyone to try.
- What units can I compare heights in?
- Centimetres, metres, kilometres, feet, inches, and feet + inches. Every height is stored in centimetres internally, so switching the display unit never changes a figure's real height — 6 ft and 182.88 cm draw identically.
- How large a size difference can it show?
- Heights from a few centimetres to several kilometres share one chart. The zoom goes to roughly 2000×, so a 1.8 m person and a 2 km giantess stay usable together instead of one of them vanishing into a pixel.
- Are the figures actually drawn to scale?
- Yes. Every figure on the chart is drawn at one shared pixels-per-centimetre ratio, so a 300 cm character renders at exactly 1.6667× the height of a 180 cm one. Proportion is a property of the layout, not something applied per figure.
- Can I use my own character art?
- Yes. Upload an SVG silhouette for any figure and it is fitted to the same true-height rules as the built-in ones, with the crown at the top of the figure and the soles on the baseline.
- Is my work saved, and is anything uploaded?
- Your figures are saved in your own browser and are still there when you return. There is no account and nothing is sent to a server. You can also export the chart as a PNG or copy a link that rebuilds the scene.