Parametric 2D/3D CAD, honestly reviewed. No marketing fluff, just what you get when you ditch the SaaS bill.

TL;DR

What it is: Free (GPL-3.0) parametric 2D/3D CAD tool — think a lightweight, constraint-solver-based alternative to Fusion 360 or AutoCAD LT, without the subscription [1][3].
Who it’s for: Makers, small hardware startups, indie engineers, and hobbyists who need honest mechanical CAD without paying $545–$2,030/year. Best for mechanical part design, 3D print prep, and simple assemblies [1][4].
Cost savings: AutoCAD starts at ~$255/month ($2,030/year). Fusion 360 runs $545/year commercially. SolveSpace is $0 — perpetually, with no “free tier” bait-and-switch [1][5].
Key strength: Constraint-based parametric modeling that’s genuinely usable on modest hardware, with no account, no telemetry, no vendor lock-in. A real GPL-3.0 license, not “open core” [1].
Key weakness: Small and slow-moving project. The website’s own footer reads “Most recent update June 2 2022.” Fewer features than FreeCAD or Fusion 360. No assembly simulation beyond basic linkage mechanisms. Not the right tool for complex multi-body engineering work [3][5].

What is SolveSpace

SolveSpace is a parametric 2D/3D CAD application. You draw sketches with constraints — parallel, perpendicular, equal length, tangent — and the built-in solver keeps the geometry consistent as you modify dimensions. From those sketches you build solid models via extrudes, revolves, helixes, and Boolean operations. The result is a file you can export as STL for 3D printing, DXF for laser cutting, or STEP for hand-off to other CAD software [1].

The project has been around since roughly 2008 and is maintained by a volunteer community under GPL-3.0 [1]. There is no company behind it, no commercial tier, no cloud offering — just source code, binaries, and a forum. As of this review, the GitHub repository sits at 3,779 stars with active CI/CD builds still running on the master branch, so the project isn’t dead — but development velocity is slow compared to funded alternatives.

The primary use cases described on the project’s own homepage are honest and narrow: modeling parts for 3D printing, preparing 2D vector art for waterjet or laser cutters, generating STEP/STL for CAM software, and simulating simple planar or spatial linkages [website]. It doesn’t pretend to be SolidWorks. That’s a feature, not a bug.

Why People Choose It

The primary reason anyone lands on SolveSpace is the cost of the alternatives. AutoCAD, SolidWorks, and Onshape are subscription-only tools with prices that make no sense for a solo founder making a physical product on a budget. Fusion 360 has a free tier for hobbyists but restricts commercial use unless you pay — and Autodesk has changed those terms once already, which is the kind of risk you don’t want in your toolchain [3][5].

From the community discussions captured in our sources, SolveSpace gets recommended specifically as a middle ground: more serious than “I’ll abuse Inkscape as a CAD program” but lighter than committing to FreeCAD’s learning curve [3]. One commenter on The Survival Podcast put it directly: “For light CAD work you may want to have a look at SolveSpace” [3].

The GPL-3.0 license is the other draw. Unlike Fusion 360’s proprietary cloud storage or Onshape’s browser-only model, SolveSpace files live on your disk in an open format. The tool runs offline, on hardware you control, without calling home. For hardware startups handling proprietary part designs, that’s a genuine reason to care [1].

The third reason — and this one comes from a real project captured in source [4] — is that SolveSpace is used for actual production work, not just toy experiments. The arachnoid.com author designed and 3D-printed a waterproof cup entirely in SolveSpace, walking through the constraint-based workflow in detail. It works for real things.

Features

Based on the feature list from LinuxLinks [1] and the project homepage:

Sketch tools:

Lines, rectangles, arcs, circles, cubic Bézier segments, C2 interpolating splines
Text in TrueType fonts (exportable as vectors)
Tangent arcs for filleting
Line styles: stroke color, stroke width, fill color
Background image import for tracing
Snap grid, cut/paste across workplanes

Constraint solver:

Distance, angle, diameter, point-on-line, point-on-circle, midpoint, symmetry
Parallel, perpendicular, horizontal, vertical, equal length/angle/radius
Length ratio, arc length equals line length
Works in both 2D (projected) and full 3D
Lengths in metric or inch; arithmetic expressions accepted (32.6 + 5/25.4)

Solid modeling:

Extrude, lathe (solid of revolution), helix from sketch
Boolean union, difference, intersection
Parametric step-and-repeat (pattern): rotating or translating
Works on both triangle meshes and NURBS surfaces

Assembly:

Link parts with six degrees of freedom and constrain them
Mirrored links, arbitrary scale
Changes in parts propagate into assembly automatically
Surface merging via Boolean operations between linked parts

Analysis:

Measure distances, angles, face-to-face and point-to-face
Trace the path of a moving point in a mechanism, export to spreadsheet
Sketch area, solid volume
Degrees-of-freedom check (highlights unconstrained sketch points)
Interference check for assemblies
“STL check” for watertight meshes

Export:

2D: DXF, EPS, PDF, SVG, HPGL, STEP
Toolpath: G-code (piecewise linear or exact curves, cutter radius compensation)
3D wireframe: DXF, STEP
Triangle mesh: STL, Wavefront OBJ
NURBS surfaces: STEP
Shaded view: bitmap

Hardware input:

3Dconnexion six-degree-of-freedom controllers supported on 32-bit Windows builds (not 64-bit) [README]

What’s missing relative to more mature tools: no FEM simulation, no generative design, no PDM/PLM integration, no drawing title block workflow, no cloud collaboration. This is a modeling and export tool, not a product lifecycle platform [5].

Pricing: The CAD Bill You’re Escaping

SolveSpace: $0. GPL-3.0. No tiers, no upgrade prompts, no “basic features require Pro.”

What you’re escaping:

Tool	Price	Notes
AutoCAD	~~$255/month (~~$2,030/year)	Subscription only, Autodesk account required
SolidWorks	~$4,000–$8,000/year (subscription)	Typically requires reseller
Fusion 360	$545/year (commercial)	Free for hobbyists, but Autodesk has changed terms before
Onshape	Free (limited) → $1,500/year (Pro)	Browser-only, cloud storage
SolveSpace	$0	GPL-3.0, runs offline, your files stay on your machine

Source [5] lists the competitive field clearly: SketchUp, AutoCAD, FreeCAD, LibreCAD, SolidWorks, nanoCAD, OpenSCAD, BRL-CAD — all positioned around SolveSpace in the open-source and budget CAD space.

Self-hosting math: SolveSpace is a desktop application, not a server. There’s nothing to self-host. Download the binary, run it, done. The savings aren’t about VPS costs — they’re about eliminating an annual SaaS subscription entirely.

If you’re paying for Fusion 360 commercially at $545/year and SolveSpace covers your use case, the math over five years is roughly $2,700 saved. Over ten years, that’s the cost of a decent CNC machine.

Deployment Reality Check

SolveSpace is a desktop application. “Deployment” means downloading and running a binary.

Official packages:

Windows (Vista 32-bit and up): installer from GitHub releases
macOS (10.6 64-bit and up): disk image from GitHub releases
Linux: Flatpak via Flathub, Snap via Snap Store, or build from source

Edge/nightly builds: available for macOS and multiple Windows variants (32-bit, 64-bit, with/without OpenMP for multi-core rendering). The 64-bit Windows build does not support 6DOF SpaceNavigator controllers — only 32-bit does [README].

Linux from source: requires CMake, zlib, libpng, cairo, freetype, fontconfig, pangomm, OpenGL/GLU, and either GTK 3.16+ or Qt6. On Debian/Ubuntu, a single apt install line gets you there. Not a scary build [README].

What can go sideways:

The project website’s last update timestamp reads “June 2 2022” — meaning documentation may be stale relative to the current binary [website].
A podcast commenter in source [3] called it “inactive since 2016” — this is wrong (the GitHub CI is still running builds in 2024), but the perception exists because development is visibly slow compared to FreeCAD.
No installer wizard, no auto-update mechanism. You check GitHub releases manually when you want a new version.
File format compatibility: SolveSpace uses its own .slvs format. Import/export to STEP, DXF, STL is solid, but you can’t round-trip a SolidWorks or Fusion file through it.

Time to working state: 10 minutes for anyone who’s downloaded an application before. This is not a server-side deployment task.

Pros and Cons

Pros

Truly free, truly open. GPL-3.0, no commercial license required, no “community edition” with crippled features. The whole tool is what you get [1].
Offline, no account required. No Autodesk ID, no cloud sync, no telemetry. Your part files are yours [1][3].
Constraint solver is genuinely good. The DOF checker, the arithmetic expression support for dimensions, and the 3D constraint system are implemented correctly and are core to the workflow, not bolted on [1].
Cross-platform binaries. Windows, macOS, Linux — official releases for all three, plus Flatpak and Snap [README].
3D printing workflow is clean. Sketch → solid → STL export is the shortest path in the tool, and it works. Real people use it for real printed parts [4].
Mechanism simulation. Pin, ball, and slide joints with path tracing is a feature that many free CAD tools skip entirely [1].
Tiny footprint. Runs on hardware you’d call obsolete. No GPU requirement.

Cons

Slow development. Website last updated June 2022. The GitHub shows ongoing CI, but feature velocity is low. Don’t expect new integrations [website][3].
No FEM, no simulation beyond kinematics. Stress analysis, thermal, fluid — none of that [5].
No collaborative features. No shared projects, no version control built in, no cloud storage. Everything is manual file management [5].
Smaller part ecosystem than FreeCAD. FreeCAD has a workbench system, a parts library, and a much larger contributor base. SolveSpace is deliberately minimal [3][5].
No DWG support. The industry-standard format for AutoCAD drawings isn’t importable. You get DXF, which is close but not identical [1][5].
64-bit Windows loses SpaceNavigator support. An oddly specific hardware incompatibility that’s been present for years [README].
Documentation is dated. The tutorials and reference manual on the project site are functional but haven’t kept pace with the application [3].

Who Should Use This / Who Shouldn’t

Use SolveSpace if:

You’re a solo founder or small team designing physical parts for 3D printing, laser cutting, or CNC, and you’re paying Fusion 360’s commercial rate for what is mostly sketch-to-STL work.
You need a constraint-based 2D/3D modeler that runs offline with no vendor relationship.
You’re on Linux and want a CAD tool that installs cleanly without a compatibility nightmare.
You’re designing mechanisms (linkages, hinges, sliders) and want to simulate motion without buying SolidWorks.
You’re building something small — a bracket, an enclosure, a custom mount — not a 500-component assembly.

Skip it (pick FreeCAD instead) if:

You need BIM, CAM workflows, FEM, or a parts library out of the box.
You’re doing serious assembly work with dozens of parts.
You want a more active community, more tutorials, and a more regularly updated UI.
You need DWG import/export for interoperability with clients or contractors using AutoCAD.

Skip it (stay on Fusion 360 free tier) if:

You’re a hobbyist with no commercial use, Autodesk’s current free tier covers your needs, and you’re comfortable with the cloud storage model.
You need the CAM workflow for CNC machining — Fusion’s CAM toolpaths are significantly more developed.

Skip it (pick Onshape or similar) if:

You need browser-based access from multiple machines without file management.
You want collaboration with team members on shared designs in real time.

Skip it entirely if:

You’re a non-technical founder who has never done CAD. The learning curve for parametric, constraint-based modeling is real regardless of which tool you pick — start with Tinkercad (browser-based, free, no install) to figure out if you even need this category of software before committing.

Alternatives Worth Considering

From the alternatives list in source [5] and the review discussions:

FreeCAD — the most direct open-source comparison. More features, more active development, more complex interface, larger community. If SolveSpace feels too minimal, FreeCAD is the natural next step [3][5].
LibreCAD — 2D only, but genuinely good at it. If you only need 2D drafting and DXF export, LibreCAD is lighter and more focused [5].
OpenSCAD — code-based parametric modeling. If you’re comfortable writing scripts instead of drawing sketches, OpenSCAD gives you precision and reproducibility that GUI tools can’t match [5].
BRL-CAD — the U.S. military’s open-source solid modeler. Extremely capable for engineering analysis, extremely steep learning curve. Not for the faint of heart [5].
Fusion 360 (free tier) — the pragmatic middle ground for hobbyists. Autodesk has changed the free tier terms before, so don’t build a dependency on features that may get paywalled [3][5].
SketchUp (free) — better UI for architectural and furniture work, worse for mechanical precision. Different tool, different use case [5].

For a non-technical founder needing mechanical CAD: SolveSpace vs FreeCAD is the honest choice. Pick SolveSpace if your parts are relatively simple and you want a faster learning curve. Pick FreeCAD if you need more capability and are willing to invest time.

Bottom Line

SolveSpace is a narrow tool that does its narrow job well. If you’re paying for Fusion 360 commercially or running an AutoCAD subscription for work that amounts to “I need to model parts and export STL,” SolveSpace cuts that bill to zero with a GPL-licensed tool that runs on any platform, stores files locally, and requires no account. The trade-off is real: slower development than funded alternatives, a smaller feature set than FreeCAD, and a community that’s small enough that you may hit the forum with a question and wait a while for an answer. But for founders and makers who need constraint-based 2D/3D modeling without a recurring vendor relationship, SolveSpace is the most honest tool in this category — it costs nothing, hides nothing, and works exactly as advertised on hardware you already own.

If you need someone to assess whether SolveSpace actually covers your use case — or to set up a more capable open-source CAD environment — that’s the kind of technical evaluation upready.dev does for clients before they commit to a toolchain.

Sources

LinuxLinks — “SolveSpace - parametric 3d CAD tool”. https://www.linuxlinks.com/solvespace-parametric-3d-cad-tool/
Pi-Apps — “Apps List” (SolveSpace listed under Engineering). https://pi-apps.io/wiki/getting-started/apps-list/
The Survival Podcast — “Episode-2732: Open Sourced Software Tools with Jason Van Gumster” (community comments mention SolveSpace as light CAD alternative). https://www.thesurvivalpodcast.com/open-sourced-software-tools
arachnoid.com — “SolveSpace: 3D Printable Waterproof Cup” (real production design project). http://vps.arachnoid.com/index.html
AppMus — “14 Best Alternatives to SolveSpace (2026)”. https://appmus.com/alternatives-to/solvespace