Shares Figma's canvas-rendering-engine problem, with a third dimension added — a real-time, precise 3D scene editor in the browser is genuinely harder than 2D, specialist graphics engineering most builds never approach.
VIBE SCORE 57/100
A moderate score above just means the individual parts are buildable — it isn't a build/buy recommendation on its own. Here's the actual reason this one's still JUST PAY:
The parts this build actually needs, each rated on its own — the average is the Vibe Score above.
| Landing page | 99 |
| Custom canvas/rendering engine | 15 |
Two real costs, not just "free": the AI agent's own usage, and hosting once it's running. Both are estimated from this app's own effort rating and component list — see the assumptions on the method page.
| AI agent — with a subscription (Claude Pro/Max, Cursor, etc.) | $0 marginal |
| AI agent — pay-per-use API, no subscription | $86–$172 one-time |
| Hosting, once it's running | $0/mo (free tier) |
| Domain name, if you want your own | ~$12/yr |
Spline costs $15/mo. Even paying per-token with no subscription, and accounting for hosting, this build pays for itself in about 12 months.
Don't feel like building it? These are already made, open-source, and free.
Just pay. Shares Figma's canvas-rendering-engine problem, with a third dimension added — a real-time, precise 3D scene editor in the browser is genuinely harder than 2D, specialist graphics engineering most builds never approach.
Spline costs $15/mo (about $180/yr) as of 2026-08. That's what a working rebuild would save you.
A real-time, precise 3D editor — moving, scaling, and texturing objects with immediate visual feedback — is a genuinely deep graphics-engineering problem, harder than the 2D canvas-rendering-engine case this register already treats as specialist work Physics simulation and interactive behaviors layered on the 3D scene compound that difficulty further Exporting to multiple 3D formats for use elsewhere needs real format-compatibility work
Yes — Three.js are open-source options worth trying before you build your own. Details are in the standard parts section on this page.
Closest matches on the register — ranked by the build parts they share with Spline, not just by category.
Browse all design tools · every comparison · how scoring works · the full register
An occasional email when new apps get reviewed — the verdict, the effort, and what changed. No tracking pixels, no drip sequence, one click to leave.