Should I use IGES or STEP?

STEP is preferred for new work — it carries solid topology and PMI. Use IGES only when exchanging with legacy systems or surface-only workflows (industrial design, shipbuilding).

3D Solid & B-Rep Standard21 verified tools

Software That Opens & Edits IGES Files (21 Tools, 2026)

IGES is the older neutral CAD exchange format, predating STEP and historically used heavily in aerospace, automotive, and shipbuilding workflows where surface geometry (not solids) was the primary representation. IGES carries NURBS surfaces, curves, and analytic primitives, but lacks STEP's solid topology and PMI. Most mechanical CAD tools still read and write IGES for backwards-compatibility with legacy data.

Full read & write support (19)

AD
Altium DesignerRead & Write
from $3850 · Windows · ★ 4.9
The professional standard for PCB and electronics design.
O
OnshapeRead & Write
from $2500 · Web / iOS / Android · ★ 4.9
The professional CAD system built for agile cloud development.
R3
Rhino 3DRead & Write
from $995 · Windows / macOS · ★ 4.9
The industry standard for complex NURBS modeling and computational design.
S
SolidWorksRead & Write
from $2700 · Windows · ★ 4.9
The de-facto industry standard for 3D parametric mechanical design.
A
AutoCADRead & Write
from $255 · Windows / macOS / Web / Android / iOS · ★ 4.8
The global industrial standard for 2D drafting and 3D modeling.
F3
Fusion 360Read & Write
from $85 · Windows / macOS / Android / iOS · ★ 4.8
The cloud-native powerhouse for integrated CAD, CAM, and CAE.
PC
PTC CreoRead & Write
from $2430 · Windows · ★ 4.8
The original parametric 3D CAD powerhouse.
SN
Siemens NXRead & Write
from $6000 · Windows / Linux · ★ 4.8
Powerful high-end CAD/CAM/CAE suite for advanced manufacturing.
AI
Autodesk InventorRead & Write
from $315 · Windows · ★ 4.7
Professional-grade 3D mechanical design and simulation.
C
CATIARead & Write
from $7080 · Windows · ★ 4.7
The high-end PLM standard for Aerospace and Automotive engineering.
3
3DEXPERIENCERead & Write
from $5000 · Windows / Web · ★ 4.3
Dassault Systèmes' cloud-based collaborative platform that unifies design, engineering, simulation, and manufacturing through virtual twin technology.
P
PowerMillRead & Write
from $7760 · Windows · ★ 4.3
Autodesk's advanced CAM software for CNC programming, specializing in 3- and 5-axis manufacturing for complex parts in aerospace, automotive, and toolmaking industries.
F
FreeCADRead & Write
Free · Windows / macOS / Linux · ★ 4.2
The premier open-source 3D parametric modeler.
P
PAM-STAMPRead & Write
Perpetual · Windows · ★ 3.9
ESI Group's sheet metal forming simulation software using finite element analysis for stamping process optimization and spring back compensation.
AE
AVEVA E3D DesignRead & Write
from $8000 · Windows · ★ 0.0
Advanced 3D plant design and engineering software for process, power, and marine industries with intelligent modeling capabilities.
DM
DesignSpark MechanicalRead & Write
Free · Windows · ★ 0.0
Free 3D CAD software for mechanical design with access to extensive component libraries and manufacturer support.
K
KOMPAS-3DRead & Write
from $3150 · Windows · ★ 0.0
Professional 3D CAD software for mechanical engineering with parametric modeling, solid/surface/sheet metal design, and integrated analysis tools.
MC
midas CivilRead & Write
from $5000 · Windows / macOS · ★ 0.0
Advanced structural analysis and FEM software for civil engineering, bridge design, and infrastructure projects.
MG
midas GenRead & Write
from $4000 · Windows / macOS · ★ 0.0
General-purpose structural analysis and FEM software for building design, architecture, and general engineering applications.

Showing top 10 products. Click to show remaining 9 tools.

Read-only / viewers (2)

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OrCADRead Only
from $2500 · Windows · ★ 0.0
Cadence's professional PCB design suite featuring PSpice simulation, schematic capture, and high-performance routing for electronic design automation.
PP
PADS ProfessionalRead Only
from $8000 · Windows · ★ 0.0
Siemens EDA's comprehensive PCB design solution for mid-to-high complexity designs with advanced simulation and analysis capabilities.

IGES Surface Geometry Exchange Matrix

Standard 1Trimmed Surfaces (Type 144): IGES files frequently split into loose, disconnected trimmed surface patches during export. Run healing algorithms to re-stitch them into solids.

Standard 2NURBS Precision: Ensure your exporting tool is using double-precision float limits to avoid slight spline edge mismatches which prevent solid shell generation.

Standard 3Coordinate Alignment: Export IGES using the absolute coordinate system rather than local user coordinates (UCS) to prevent mechanical assembly component offset errors.

Frequently asked

Should I use IGES or STEP?: STEP is preferred for new work — it carries solid topology and PMI. Use IGES only when exchanging with legacy systems or surface-only workflows (industrial design, shipbuilding).

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Full read & write support (19)

Read-only / viewers (2)

Frequently asked

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