Tech that feels instant

SoupBrain builds clean, modern automation and AI tools that remove busywork and keep things simple.

Meet SplineGen

Try SplineGen →

The modern spline generator for engineers

Seven international standards, FEA stress analysis, 9 export formats, and a 133-material database—running entirely in your browser. No installs, no $15K license.

splinegen.com
SplineGen application interface showing involute spline parameters and 2D drawing
FEA Stress Analysis

See where the metal yields

A built-in 2D Saint-Venant torsion solver meshes the actual cross-section (including any tooth edits) and paints stress contours right on the drawing. Get peak shear, stress concentration factor, FOS, and angle of twist—solved in seconds, no desktop CAE required.

  • Sector meshing with ~20× resolution per tooth for symmetric splines
  • Conjugate-gradient solver, scale-invariant normalization
  • Color-mapped overlay with toggleable legend
Tooth Layout

Edit teeth interactively

Remove teeth, merge gaps, and preview every change live. 1-, 2-, 3-, and 4-way symmetry modes keep your design balanced—or break symmetry on purpose when the application calls for it.

LTCA & Misalignment

Per-tooth load distribution

A spring-stiffness model accounts for pitch error and shaft misalignment, showing exactly which teeth carry the load. Feed the computed k_load straight into the analytical stress formulas.

7 Standards

Involute & serration—every common spec

ANSI B92.1, B92.2M, ISO 4156, DIN 5480, plus three serration standards (Generic, SAE J500, DIN 5481). Switch the standard, the entire UI adapts.

  • External, internal, or overlay (hub + shaft) profiles
  • Pressure angles 14.5° through 45°; class 4–12 fits
  • Dual tolerance system for B92.1 (ISO 286 IT-grade or ANSI reference)
  • DIN 5480 reference diameters 6 mm – 500 mm, 16 modules
Material Database

133 materials, 10 categories

Carbon & alloy steels, stainless, tool steels, cast iron, aluminum, copper/brass, titanium, superalloys, engineering plastics, and 3D-printed polymers—each with yield, tensile, modulus, hardness, and Poisson's ratio.

Machining Estimates

From geometry to shop floor

Six processes—broaching, grinding, wire EDM, sinker EDM, hobbing, shaping—with material-specific overrides. Get spindle RPM, feed rate, total thrust, and burn-risk warnings before you cut chips.

Export & Compliance

Nine formats, one PDF compliance report

DXF (2018 & 2013), STEP, STL, SVG, PDF, AutoCAD script, CSV, and a multi-page engineering compliance report suitable for AS9100 / IATF 16949 design packages—with sign-off blocks, FOS indicators, LTCA results, and a 7-point disclaimer.

  • Pair-mode DXF with separate Shaft and Hub layers
  • Per-field unit override; precision 3–10 decimals
  • Conditional sections—no blank pages
Pair Mode & Fit Analysis

Shaft and hub, side by side

Render the mating profiles together. Get major/minor clearance, backlash, effective clearance, and interference detection with color-coded status.

2D Technical Drawing

Crisp SVG, every reference circle

Professional SVG rendering with toggleable major / minor / pitch / form / base diameter circles, hatch patterns, and pin overlays. Pan and zoom with mouse or touch; nine independently configurable colors.

3D Visualization

From cross-section to solid—live in the browser

A full 3D extrusion of the spline cross-section, rendered in WebGL via Three.js. Five metal material presets (steel, aluminum, copper, titanium, stainless), three-point lighting, adjustable transparency, and orbit controls—pan, rotate, zoom with mouse or touch.

  • Solid model spins up instantly from the same geometry as the 2D drawing
  • Pin overlays carry through to the 3D view for inspection visualization
  • Pair with the 2D SVG renderer for technical-drawing output

Standards supported

  • ANSI B92.1
  • ANSI B92.2M
  • ISO 4156
  • DIN 5480
  • SAE J500
  • DIN 5481
  • Generic Serration

How SplineGen compares

Feature Free calculators SplineGen KISSsoft / Hexagon
Standards coverage1–273–5
CAD export (DXF/STEP/STL)—9 formatsNative CAD
2D FEA stress analysis—Yes3D
LTCA / load distribution—Spring modelFull contact
Material database—133 materialsExtensive
Machining estimates—6 processesSeparate tools
Web-based, no installSomeYesDesktop only
PriceFree$12.95–$24.95/mo$8K–$25K+