Mathematical Vector Geometry Architecture

Engineered for Digital Pattern Cutters & Apparel Technologists

sloper.fit replaces slow manual drafting with an in-browser parametric geometric solver. Every curve, dart, notch, and seam allowance is computed to 0.01mm mathematical precision.

Launch App Studio Explore Free Patterns

Parametric Armhole & Scye Math

Dynamic Cubic Bézier Curves & Scye Depth Alignment

Armholes and necklines aren't approximated with crude straight segments. Our solver computes smooth cubic Bézier splines tangent to shoulder slope angles, maintaining exact perimeter balance between front armholes and sleeve caps.

Automatic easing ratio preservation across sleeve crowns
Seamless notch alignment at 1/3 and 2/3 scye inflection points
Zero flattening or corner pinching when grading across sizes

bezier_scye_solver.ts TANGENT C1

Perimeter: 433.0 mm Delta: 0.00 mm

dart_roof_convex_truing.ts AUTO ROOF REFLECT

Fold direction: Toward Center Front Distortion: 0% Flush

100% Zero Fabric Gap Guarantee

Convex Dart Roof Extension & Folding Truing

When darts are folded flat during garment assembly, straight seam allowances create unsightly notches or missing fabric chunks. sloper.fit calculates the mirror-reflected convex roof geometry over dart legs so the edge lies completely straight once stitched.

Correct crest calculation for side bust darts, waist darts, and shoulder darts
Automatic fold direction detection (Center vs Side seam)
Built directly into all exported PDFs, SVGs, and DXF files

Physical Integrity Protocol

Guaranteed 1:1 Physical Print Calibration Box

The #1 issue with downloaded sewing patterns is printer scaling error. sloper.fit embeds a dedicated Page 1 featuring an ultra-precise high-contrast 100mm × 100mm (and 4 × 4 inch) verification test square.

Dual millimeter and imperial calibration grids
Foolproof visual check before cutting expensive silks and wools
Consistent 72 DPI to 300 DPI vector rendering

100mm 4.00 INCHES TEST SQUARE

Standard Calibration Sheet Guarantee

Included on every single sloper PDF downloaded from sloper.fit. If the box measures exactly 100mm with a ruler, your entire pattern fits with millimeter accuracy.

Universal Interoperability

Enterprise Exporter Standards

Export patterns to home desktop printers, large-format plotters, digital laser cutters, or 3D fashion simulators.

DXF

ASTM D6673 / AAMA DXF

Compatible with CLO3D, Marvelous Designer, Gerber AccuMark, Lectra Modaris, and Browzwear.

• Layer 1: Perimeter Cutline

• Layer 2: Internal Seamline

• Layer 4: Balance Notches

• Layer 7: Directional Grain

PDF

Tiled A4 & US Letter PDF

Designed for ordinary desktop home printers with margin clipping guides, diamond registration markers, and sheet assembly maps.

• Dedicated Sheet 1 Test Box

• Matrix Grid (Row A–D, Col 1–6)

• 10mm Overlap Margins

SVG

1:1 Millimetric SVG CAD

True 1:1 scale millimeter vectors with styled vector layers, text halo contrast, and Cricut / Glowforge / laser cutter compatibility.

• Precise viewBox & scale units

• Grouped piece hierarchies

• Projector sewing ready

Continuous A0 Plotter

Uncut wide-format plot sheet ready for print shops, architecture plotters, or digital ceiling projector sewing setups.

• 841 × 1189 mm standard sheet

• Zero tiling or taping needed

• High contrast cutlines

Experience Parametric Drafting Live

Create custom fitted bodice, skirt, or trouser blocks directly in your browser with real-time vector geometry.

Open Studio Workspace