Native parametric CAD for Mac. Buy once, own it forever. Metal-fast, offline, no cloud lock-in. Parametric like Fusion — but yours. Native parametric CAD with a built-in gear generator (ISO 21771). One-time purchase, no subscription. Native parametric CAD, fully offline — and drivable by your own AI assistant (MCP, planned for the beta). Buy once, no subscription.
Contornia turns an idea into a print-ready part — parametric, fast, and fully offline. No subscription, no cloud requirement, no 10-document cap. Buy it once; the file is yours. Built on a Mac, for Mac makers who've had enough of Fusion 360 stutter.
100% refundable until launch macOS 14+ Apple Silicon
The signature capability
Built in, parametric, print-ready. Contornia's gear generators compute real involute teeth to ISO 21771 — planetary, spur, and rack gears. Type in the tooth counts, get a printable part. No add-in, no script, no Autodesk app store.
I want this → Claim your Founder seatFusion's hobby licence is generous — right up until you hit the walls that exist to push you into a €680/year subscription. On a Mac, stutter and cloud round-trips come on top. Contornia knocks every one of those walls down.
| Fusion 360 — Personal Use (free) | Contornia |
|---|---|
| 10 active documents max. Your 11th design forces you to freeze another one (read-only). | Unlimited projects. They're files on your disk. That's it. |
| Export cut down: no IGES, SAT, DWG or DXF export on the Personal licence. STEP only stayed in 2020 after a backlash — Autodesk sets the rules, not you. | STL, 3MF & STEP, no licence gate. Your geometry, your formats — today and in five years. No licence clause can take that back. |
| 2D drawings: a single sheet per drawing. | Print-first: 3MF/STL, print-ready, without the single-sheet grind. |
| Must go online every 2 weeks. No login → no CAD. Your designs live in Autodesk's cloud. | Fully offline. No login, no account, no cloud. Starts on a plane exactly like it does at your desk. |
| Non-commercial only: more than ~$1,000/year in revenue from your making = licence breach. | Buy once, your licence. Sell your prints. We don't care — it's yours. |
| Noticeably sluggish on Mac: cloud round-trips, no native rendering, lukewarm performance on Apple Silicon. | Metal + AppKit from the ground up. No Electron, no cross-platform layer, no SwiftUI overhead. Built for your chip. |
This isn't “cheaper than Autodesk” — free beats any price. It's yours, fast, and runs without anyone's permission.
Contornia is Swift, AppKit and Metal — Apple's own graphics pipeline — from the very first line. No Electron, no cross-platform wrapper, no cloud round-trip between you and your model. Orbit, zoom and rebuild run at your display's refresh rate, not at the mood of a data centre. On Apple Silicon it feels like a Mac app, because it is one.
Pay once, use forever. No subscription that ratchets up every year. No forced account, no
“log in to keep working”. Your designs are files on your drive
(.contornia, openly documented JSON) — not a proprietary cloud vault someone else
can lock. No internet required. No clause that takes export formats away again.
Contornia computes on a manifold-guaranteed geometry kernel. Translation: no open edges, no non-manifold errors, no “your slicer reports holes” surprises at midnight. Export to 3MF and STL is the main road, not the fire exit. What you see in the viewport is what your Bambu/Prusa prints.
Built in instead of bolted on: parametric gear generators to ISO 21771. Planetary gearboxes, spur gears, racks — including profile shift, backlash, tip relief and helical teeth. Tooth counts in, correctly meshing print-ready teeth out. What's an add-in bazaar in Fusion is a panel in Contornia.
Two captures straight from the Contornia viewport, current development build — no mockups, no renders from another program.
Contornia isn't finished yet — which is exactly why the Founder price is real and not just marketing. Get in now and you help fund a one-person studio, and you get the lowest price there will ever be, permanently.
| Feature | Founder | Later (v1.0) |
|---|---|---|
| Price | €99 one-time | €149 one-time |
| Licence | Perpetual (yours forever) | Perpetual |
| v1.0 included | yes | yes |
| All 1.x updates | included | included |
| Founder beta access (spring 2027) | yes | no |
| Your name in the credits (optional) | yes | no |
| Direct line to the developer (Discord) | yes | Standard support |
No subscription, no risk. You lock in the €99 Founder price and beta access. Change your mind — for any reason, before launch — and you get 100% back. One click, no questions.
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Pre-order / early-access reservation: delivery happens at launch — there
is no instant download now. Fully refundable at any point until then. Our
right-of-withdrawal policy and
privacy policy apply.
Roadmap (honest): Founder beta from spring 2027. Public v1.0 by Q3 2027 at the latest. If the date slips you have two options: wait, or take your money back. Your call, always.
Get updates instead and be there when the beta opens. No purchase needed.
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Not for you? One click tells us why:
Because Fusion's “free” has conditions: 10 active documents max, no IGES/SAT/DXF export on the Personal licence, single-sheet 2D drawings, a mandatory login every two weeks, your data in Autodesk's cloud, and a revenue cap of roughly $1,000/year. Contornia has none of that. You pay €99 once and get speed, offline operation and real ownership. We don't compete on price — we compete on control.
Yes — any time until launch, 100%, no reason needed. It's a pre-order, not a bet. One click in the order portal or an email to us is enough.
Yes — deliberately. Contornia is built on Metal and AppKit, not on a cross-platform layer. That's exactly why it's fast and feels like macOS. Requirements: macOS 14+ on Apple Silicon (M1 or newer). No Windows/Linux version is planned; serving a second operating system would cost precisely the native quality you came for.
Completely. Your designs are local files in the openly documented
.contornia format (JSON), plus standard export to STEP, STL and
3MF. Nothing has to live in a cloud, nothing is chained to an active
subscription. If Contornia folds tomorrow, your files and the app you bought keep working.
Honest answer, because you're becoming a Founder: at launch the focus is parametric solid modelling (sketch → extrude/revolve/sweep/loft, fillet/chamfer/shell, booleans, patterns), the gear generators, and print export (3MF/STL/STEP). Not there yet: full technical drawing derivation, assembly constraints at Fusion's level, CAM/milling, FEM simulation and a rendering studio. That comes step by step — as a Founder you get a vote on what comes first.
And because you should know: Contornia runs on a mesh kernel. Fillets currently apply to the whole body, not to individual edges (in progress), and STEP export contains faceted rather than exact surfaces. Irrelevant for 3D printing — not always for CNC milling at a job shop.
Founder beta from spring 2027, public v1.0 by Q3 2027 at the latest. As a Founder you're in the beta and see every milestone. If something slips, you decide: stick around, or take your money back.