Nullcore
Nullcore // Pro Tier

NullFit Pro

The fastest way to refit clothing onto 3D models. Now with live real-time sculpting.

The upgrade tier for power users: drag-and-watch live preview, four refit algorithms with auto-repair, multi-outfit batching, and surgical per-region control. A job that used to eat 5+ hours per model now takes about 30 minutes.

demo
Watch the full workflow › Quick showcase (30s) ›

Shows the complete pipeline, including the 30-second touch-up sculpting on the few outfits that need it. No misleading "one-click magic" cuts. What you see is what you get.

Get NullFit Pro ›
Pricing
 
Blender
$35
one-time
The Blender add-on and the Companion. The full Pro toolkit, in Blender.
Get Blender ›
 
Unity
$35
one-time
The Unity version and the Companion. The full Pro toolkit, in Unity.
Get Unity ›
Best value
Bundle
$40
one-time
Both engines, one purchase. Just $5 more than a single version, the obvious pick if you work in both.
Get the Bundle ›

Prefer a subscription? Nullcore Cloud runs NullFit and NullSculpt in the cloud from $20/mo.

What Pro unlocks

Live Preview — real-time sculpting

  • Four real-time sliders — Looseness, Anti-Clip, Body Clearance, Polish. Drag and watch the refit react instantly.
  • Four presets — Tight / Standard / Loose / Layered. One click for the common cases.
  • Clipping heatmap + Fit Check score — see exactly where cloth pokes through, with a fit-quality score, before you commit.
  • No bake-and-pray loop. Sculpt, look, ship.

Refit algorithms — pick the one your model needs

Standard

The everyday refit. Clean and fast; all most humanoid models need.

Better

The default Pro algorithm. Stronger refit plus one-click clipping cleanup. Handles ~95% of standard models.

Adaptive

Built for complex models (anthro, stylized) where the standard refit distorts. Handles the awkward cases simpler refitters can't.

Snap

Last-resort fit for irregular models: dragons, custom proportions, anything other algorithms can't track. Forces a clean fit when nothing else will.

If a refit looks off, the panel tells you which stronger option to try next. You don't have to guess.

Get the fit perfect

  • Auto Clipping Repair — standalone, three detection modes (Fast / Balanced / Thorough), strength up to 2.0, optional smoothing.
  • Shrink to Fit — pull cloth in snug against the body for a clean close fit.
  • Symmetrize — mirror a fit so both sides match perfectly.
  • Smoothing Workshop — standalone smoothing playground. Run it on any refit result, layer the effect, dial the strength.
  • Preserved Faces — in Edit Mode on the cloth, select the parts you don't want touched (waistband, trim, anything) and click Mark. Those faces stay locked no matter what refit you run.

Surgical control

  • Shape Key Filter — restrict the refit to specific regions. "Breasts Only" refits just the cup and leaves straps and band alone; "Exclude Breasts" refits everything except the chest.
  • Strength Slider — one 0.5 to 2.0 dial. 1.0 is normal, higher for more breathing room, lower for a tighter fit. No guessing at millimeter numbers.

Productivity & batch

  • Refit All Selected — apply the refit to every selected outfit in one click.
  • Match All Shape Keys — for each body shape key, create a driver-ready cloth-side key so the outfit follows the body live.
  • Multi-Body Wardrobe & Presets — capture body shapes as presets, then run any number of outfits against any number of bodies in one click.
  • Weight Transfer — copy body vertex groups onto store-bought outfits so they inherit your model's rig.
  • Align to Body & Bake Cloth Pose — helpers to seat an outfit on the body and bake a posed result before refitting.
How it works

An add-on does the work in your scene, in Blender or Unity, paired with the Nullcore Companion app that handles the heavy lifting. Install both, activate Pro with your license key, and refit. The walkthrough below shows the Blender path; the Unity version drops into your project the same way.

  1. Buy here — your license key arrives by email within seconds.
  2. Download the bundle from your Gumroad library: three files — Nullcore-Companion-[VERSION]-Setup.exe, nullfit.py (the Blender add-on), and README.txt.
  3. Run the installer. A real per-user Windows wizard, no admin, no UAC, no zip-fiddling. SmartScreen will warn on first run since the build isn't signed yet: click More info, then Run anyway. (EV cert is on the wishlist.)
  4. Companion launches. Paste your key, click Activate.
  5. The refit engine downloads automatically from your Library tile. Restart Companion once when it finishes.
  6. Install nullfit.py in Blender — Pro features unlock in the NullFit tab.

That's the whole process. No subscription, no monthly check-ins.

Tech specs
Engines
Runs as a Blender add-on and as a Unity version, $35 each. Or take the bundle: both engines for $40, only $5 more than a single version.
Platforms
Blender 2.93 LTS through 5.x, and a Unity version for current and recent Unity releases. Windows; macOS / Linux on the roadmap if there's demand.
Compatible
Runs alongside the CATS Blender Plugin without conflict.
Models
Any humanoid model with shape keys + clothing: humanoid, anthro, dragon, stylized, and custom-proportion, including the irregular cases other refit tools can't handle.
License
1 machine per license. Moving to a new PC? DM me on Discord and I'll release your slot.
Updates
Free updates on the v1.x line. Companion notifies you when a new version ships and pulls it directly, no return trip to your store page.
Privacy
Authenticates on startup, then no telemetry, no usage tracking, and no phone-home. Short offline stretches are fine.
Is Pro actually for you?

Pro is the one-time, offline, full license, built for power users: multi-outfit batches, irregular models (anthro, dragons, custom proportions), live-preview sculpting, and per-region surgical control. It comes as a Blender add-on or a Unity version at $35, so it drops into the tool you already use, and the bundle adds the second engine for just $5 more. Prefer a subscription to a one-time purchase? Nullcore Cloud runs the same tools in the cloud, plus NullSculpt.

Support & policies
Discord (fastest support) › GitHub issues › End User License Agreement ›

All sales are final once a license has been activated. That said, if something is genuinely broken on your end, DM me on Discord first. I'd rather fix it than leave you stuck.

FAQ
Do I need to know Blender or Unity?
No. NullFit lets you refit and fine-tune outfits with sliders, no weight painting, no mesh editing. It comes in a Blender add-on and a Unity version, so you can work in whichever you already use. If you do know the software, it just saves you hours.
What does NullFit actually do?
It refits and fit-sculpts clothing so an outfit conforms to a given model, transferring weights, adapting the shape, and repairing clipping. It works on the clothing; it doesn't reshape the model's body for you.
How is NullFit priced?
The desktop versions are a one-time purchase, the Blender add-on or the Unity version for $35 each, or both bundled for $40, just $5 more for both engines. Prefer a subscription? Nullcore Cloud runs the same Pro tools in the cloud, plus NullSculpt, with nothing to install, for $20/mo.
What exactly do I get?
Two pieces: the Nullcore Companion (a Windows app that holds your license and runs the compute), and the NullFit add-on for your engine, the Blender add-on or the Unity version. You need both, and they talk to each other locally on your machine.
Does my data leave my computer?
It depends on the fit. For local fits, the Blender Pro refit runs entirely on your own computer and your meshes are never uploaded. Server-side fits, the Unity tool and the Cloud plan, send the specific body and outfit meshes you select to my server to compute the fit and return the result; those meshes are processed only to perform that fit, are not stored afterward, and are never used for anything else. Either way, your other models, project files and session contents are never read or uploaded. The license is checked with my server at activation and via lightweight checks afterward, and I run no usage telemetry. The privacy page has the full detail.
My antivirus flagged the installer. Is it safe?
Yes. NullFit is an unsigned indie installer, so Windows SmartScreen and some AV tools are cautious on first run. Click "More info, then Run anyway," or restore from quarantine and add a folder exclusion. It's a false positive from the licensing protection layer.
Which Blender and Unity versions are supported?
The Companion installs the plugin into the Blender versions it detects on your machine, and the Unity version drops into your project. Both work across current and recent releases, just restart after installing.
How do updates work?
In-app. The Companion notifies you when a new version is available and updates itself; the plugin updates with one click. You don't need to re-download from Gumroad for new versions.
Can I use it on more than one PC?
A license activates on one machine at a time. If you change machines, reach out in my Discord and I'll release your old slot.
What happens to my Pro license if you stop working on NullFit?
Your access stays. Blender Pro is a one-time purchase, and I'm building a continuity plan so legitimate license holders keep full access even if I step away or the project winds down. The goal is simple: your access should not depend on me being around to keep it alive.