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MachineForge on the web is built the same way as our iOS apps: private by design.
Your work stays on this device
Your progress — best scores, XP and days active — is stored only in this browser (on-device storage). It is never sent anywhere. Clear your browser data and it's gone; nobody else can see it.
The lab and gear drill run right here
The mechanical-advantage lab and the gear-ratio drill are pure on-device math — the exact same formulas the MachineForge iOS app uses (effort ÷ load-arm for a lever, driven ÷ drive teeth for a gear, and so on). There's no server, no simulator in the cloud, and no AI that sees what you build.
No accounts, no ads, no tracking
There is no sign-up and no login. There are no ads and no in-app purchases. There are no third-party trackers embedded in the app.
Built for ages 9–14
The 400 concept questions come straight from the MachineForge iOS project and are aligned to NGSS engineering-design and simple-machines standards. A hint appears only after a first try — you think it through first, and mistakes are treated as part of learning. The iOS app also has a hands-on physics sandbox (build a catapult, knock down a tower) that needs a phone's physics engine — that part stays on iOS; the web version focuses on the reasoning and the math.
Spark & Anvil is a non-profit, 501(c)(3) pending. Apps stay free forever. This page is a plain-language summary, not legal advice.