Chapter 1 is free — nine levels. One purchase unlocks the other 48 levels across 7 chapters, plus the god-mode sandbox and the level editor. No ads, no timers, no subscription.

Does it work on iPad and Mac?

Yes. Span runs on iPhone, iPad and Apple silicon Macs, and your progress follows you between them over iCloud.

Yes. Every beam is solved for tension and compression on every frame, and the colour you see is that force. A bridge fails because its load path fails, not because a script decided it should.

Do I need to know engineering?

No. The first level walks you through drawing a beam, testing it and reading the stress view — and every level ships a worked solution you can ask to see when you're stuck.

Physics bridge builder

Build it. Test it. Hold on.

Span is a calm, physics-driven bridge builder. Draw a bridge across the gap, choose your materials, then press Test and watch it carry the load — or buckle in glorious slow motion.

See it move

iPhone · iPad · Mac

One-time purchase. No ads, no timers, no subscription.

Every beam glows with the forces running through it: a live X-ray of tension and compression, so you can see exactly why it held, or why it snapped. Rewind, move one strut, try again.

Features

What's in the box

57 hand-built levels across eight worlds — timber valleys to ocean straits
Timber, steel, stone, cables and road & rail decks
Real hazards: wind, earthquakes, thermal stress and floods
Drawbridges, canal locks, trains and passing ships
God-mode Sandbox: unlimited budget, every material, every disaster
Level editor: sculpt terrain, place anchors, schedule the traffic

Screens

See it move

FAQ

Questions

Is Span free?: Chapter 1 is free — nine levels. One purchase unlocks the other 48 levels across 7 chapters, plus the god-mode sandbox and the level editor. No ads, no timers, no subscription.
Does it work on iPad and Mac?: Yes. Span runs on iPhone, iPad and Apple silicon Macs, and your progress follows you between them over iCloud.
Is the physics real?: Yes. Every beam is solved for tension and compression on every frame, and the colour you see is that force. A bridge fails because its load path fails, not because a script decided it should.
Do I need to know engineering?: No. The first level walks you through drawing a beam, testing it and reading the stress view — and every level ships a worked solution you can ask to see when you're stuck.