HOW IT WORKS
A GitHub for battling tops
Today, custom battling-top designs live scattered across drives, forums, and print sites - with no shared home, no attribution, and no way for the people who made them to be credited or paid. Inertia changes that.
The Idea
People already design and 3D-print their own battling tops - for fun, for homage, for competition. But a design you spent weeks on gets copied, reposted, and remixed with your name stripped off, and you never see a cent when someone prints it.
Inertia is a common, attributed home for those designs. Upload one to Inertia and it's logged with credit; fork or remix it and the lineage stays linked; play any design instantly in Arc, our physics simulator; and when someone prints a top, a single payment flows to everyone who helped make it.
"Design, play, and build on each other's work - with credit and payment that follow the file."
The Three Pillars
Arc
The simulator. Play any design instantly in real, geometry-driven physics. Free, open source, runs offline.
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The Registry
Upload designs to Inertia with attribution and fork lineage. You set the license and royalty terms.
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Print & Get Paid
Order a print and one payment fans out to every designer in the lineage and the maker.
Read more →Arc - The Simulator
Free • Open Source • The Engagement Hook
Upload a design file and it's immediately playable in Arc - no purchase, no print, no account. Drop two tops in a bowl and battle them in physics driven entirely by their geometry: the shape of the contact ring decides how hard a hit lands, the mass distribution decides stamina and stability, the tip decides how it moves across the floor.
There are no made-up stats - no "attack +2." Every number Arc shows is read straight from the file. That makes it a genuine design tool: iterate against a real model and see a balance problem before you ever spend money printing it.
For players: battle with designs the community has made - these tops never break and never cost a dime.
For designers: a fidelity-rich middle step between sketching an idea and committing it to metal.
For developers: Arc is an open repository the community builds toward true-to-life realism. It needs no internet to run - point it at your own stash of designs, the official Inertia registry, or anyone else's.
The Registry
The Core • Built on the Open Zephyr Protocol
When someone says "upload that to Inertia," the registry is where it lands. Deposit a design and it's logged with attribution that travels with the file. When someone forks it — rebalances it's weight into an attacker, reskins it, tunes a single gram — that new version stays linked to the lineage it grew out of. Your own iterations form a chain too: v1 to v2 to v3, all yours, all visible.
The original author sets the license and royalty terms. A fork carries those terms forward and can add its own. Makers finally get seen among their peers - like other maker communities, but with credit built in from the first upload rather than bolted on after.
Uploading is free - getting onto the protocol shouldn't cost anything. The registry rides the open Zephyr protocol, a neutral, attribution-bearing layer Inertia builds on top of rather than owns.
Print & Get Paid
On the Roadmap • The Value Loop
When you're ready to hold a design in your hand, order a print right through Inertia. We route the job to print-on-demand makers, show you quotes, and let you pick on price, shipping, and material - plastic for playtesting, metal for the real thing.
Because the platform owns the checkout, a single purchase fans out automatically: every designer in the lineage is paid their declared share, and the manufacturer is paid for the print - all in one cross-border transaction, in real money. The manufacturer is just another payee, not a gatekeeper.
No token. No speculation. No middleman taking a cut nobody agreed to. The split is known up front, and the people who made the thing get paid the moment it sells.
How the Split Is Decided
Inertia can verify lineage by geometry - who derived from whom is machine-checkable. But it deliberately does not try to compute how much a change is "worth." A one-gram balance tweak can be the entire competitive value of a top; a flashy cosmetic reskin might be worth very little. No algorithm should pretend to judge that.
So the platform routes value, it doesn't appraise it. The original author declares license and royalty terms; a fork carries those forward and adds its own; at sale, payment simply follows the declared terms along the chain. Collaborators who want a custom arrangement can negotiate their own split - with a human in the loop, not a formula.
"Attribution is computed. Value is declared. Payment is routed."
Who It's For
Designers & Makers
Upload original designs to Inertia and keep credit forever. Set your own terms. Earn when people print your work or build on it.
Result: your name stays on your work, and your work can finally pay you back.
Players
Battle real designs in Arc for free - tops that never break and never sell out. Print the ones you love.
Result: a way to play and compete that isn't gated by scalpers or store stock.
Open-Source Developers
Arc is an open engine. Contribute toward higher physical fidelity, new stadiums, and game modes - with your contributions attributed too.
Result: a meaty, real-physics open-source project with attribution and payment baked in.
The Community
A path toward a community-owned design ecosystem - open geometry, open mechanics, open launchers - that no single company controls.
Result: original IP the community builds, owns, and can keep building on.
Why It's Not Crypto
Attribution and payment might sound like blockchain territory. It isn't. Inertia keeps the useful part - cryptographic proof of who made what - and drops the rest. No token to buy, no coin to hold, no speculation.
Creators are paid in real money over open payment rails, in their own currency. Attribution works because designs should proliferate, not become scarce collectibles - the opposite of an NFT.
"Cryptography, not cryptocurrency."
Where We Are
Built in the open, foundation first. Here's what's live, what's proven, and what's next.
Inertia App - Open Beta
Live NowThe competitive-play companion is live and free - tournaments, practice tracking, combo building.
Geometry Engine - Tier-0 Validation
ProvenReal community designs separate cleanly into attack / stamina / defense archetypes from geometry alone - zero authored stats.
Arc - The Simulator (MVP)
In DevelopmentLoad a design, drop it in a bowl, and battle it. The open engine the developer community grows toward true-to-life fidelity.
Design Registry + Attribution
In DevelopmentUpload, fork, and remix with machine-checkable lineage - built on the open Zephyr protocol.
Print-to-Pay Loop
NextOrder a print and one cross-border payment splits fairly across the lineage and the maker - real money, no token.
Get In Early
We're building the open home for battling-top design. Join the list for early access to Arc and the registry, and a say in where it goes.
Join the Early ListOriginal designs only - Inertia is brand-clean and community-owned.