Softwr

CAD · head to head

nTop vs SolveSpace

nTop logo

nTop

CAD

Implicit computational design for lattices, heat exchangers and topology-driven parts

From
On request
Rated
-
Full reviewWebsite
S

SolveSpace

CAD

Open source parametric CAD with a constraint solver in a few megabytes

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only SolveSpace has a free tier, so it costs nothing to try first.
  • Each has a real cost: nTop nTop is a specialist tool that sits alongside mainstream CAD rather than replacing it, so you pay for an extra seat and accept a handoff between two geometry systems.; SolveSpace the in-house geometry kernel fails on complex boolean operations and fillets, and the failure is sometimes silent bad geometry rather than an error message, so models must be checked before export or manufacture.
  • They diverge on capability: nTop covers Implicit modelling, SolveSpace covers Constraint solver.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which nTop and SolveSpace actually diverge.

Attributes where nTop and SolveSpace differ
AttributenTopSolveSpace
Starting priceOn requestFree
Pricing modelquoteOpen source, no licence fee
Free tierNoYes
PlatformsWindows, CloudWindows, macOS, Linux

Identical on both: user rating (Not yet rated), category (CAD).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in nTop

  • Implicit modelling
  • Lattice and cellular structures
  • Field-driven design
  • Integrated simulation
  • Reusable workflows
  • Topology optimisation
  • CAD and AM interoperability

Only in SolveSpace

  • Constraint solver
  • Solid modelling
  • Assemblies
  • Export formats
  • Cross-platform
  • Small footprint

What people use each for

The jobs each tool is most often brought in to do.

nTop

  • Designing a variable-density lattice bracket where mass must drop without losing stiffness in the loaded regionsnot SolveSpace
  • Generating a heat exchanger with thousands of internal channels that a conventional CAD kernel cannot representnot SolveSpace
  • Producing patient-specific implant geometry with porous surfaces at scale rather than one at a timenot SolveSpace
  • Automating a family of parts as a reusable design workflow that reruns when the load case changesnot SolveSpace

SolveSpace

  • Designing 3D printed parts on a machine that cannot run mainstream CADnot nTop
  • Teaching constraint-based parametric modelling without buying licences for a classroomnot nTop
  • Checking that a mechanical linkage moves as intended before cutting metalnot nTop
  • Producing dimensionally accurate STEP or STL output from a small open source toolchainnot nTop

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

nTop

  • nTop is a specialist tool that sits alongside mainstream CAD rather than replacing it, so you pay for an extra seat and accept a handoff between two geometry systems.
  • Implicit modelling requires a different way of thinking from feature-based CAD, and the retraining period is long enough that unused licences are a common and expensive outcome.
  • No pricing is published and there is no free or hobbyist tier, so evaluation runs through a sales process and small teams cannot try it seriously without engaging.
  • Subscription only, with no perpetual licence, means the geometry logic you built stops being editable the day you stop paying, which is a real risk for long-lifecycle aerospace and medical programmes.
  • The output is most valuable when you have additive manufacturing capacity to make it; organisations without machines that can print the geometry end up designing parts nobody can produce.

SolveSpace

  • The in-house geometry kernel fails on complex boolean operations and fillets, and the failure is sometimes silent bad geometry rather than an error message, so models must be checked before export or manufacture.
  • There is no proper drawing and dimensioning workflow, so manufacturing documentation has to be produced in another application.
  • Development is volunteer-led and intermittent; long gaps between releases are normal and there is no support contract available at any price.
  • Assembly-level import of external CAD is very limited, so it does not fit a supply chain that exchanges native or assembly-level models with suppliers.
  • The interface follows its own conventions rather than mainstream CAD ones, so existing SolidWorks or Fusion users spend time unlearning habits for a tool with a lower ceiling.

Pricing, plan by plan

nTop

On request
  • nTop$undefined/year
    • Annual named or floating seat subscription
    • No perpetual licence offered
    • Capability tiers quoted by use case

SolveSpace

Free
  • SolveSpaceFree
    • Full application under the GPL
    • No seat limit
    • Windows, macOS and Linux builds

Which should you pick?

Choose nTop if

  • You need implicit modelling.
  • You work on Windows, Cloud.
  • You also want lattice and cellular structures.
nTop review

Choose SolveSpace if

  • You need constraint solver.
  • You want to start without paying.
  • You work on Windows, macOS, Linux.
  • You also want solid modelling.
SolveSpace review

Questions people ask

Is nTop or SolveSpace better?
Neither clearly leads. nTop starts at On request and SolveSpace at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, nTop or SolveSpace?
SolveSpace has a free tier; the other does not. Paid plans start at On request for nTop and Free for SolveSpace.
Does nTop or SolveSpace run on more platforms?
nTop runs on Windows, Cloud. SolveSpace runs on Windows, macOS, Linux.
Can I use SolveSpace for free?
Yes. SolveSpace has a free tier, so you can try it without paying. nTop starts at On request.
What is nTop best used for?
nTop is most often used for designing a variable-density lattice bracket where mass must drop without losing stiffness in the loaded regions, generating a heat exchanger with thousands of internal channels that a conventional cad kernel cannot represent, producing patient-specific implant geometry with porous surfaces at scale rather than one at a time, automating a family of parts as a reusable design workflow that reruns when the load case changes. Of those, designing a variable-density lattice bracket where mass must drop without losing stiffness in the loaded regions and generating a heat exchanger with thousands of internal channels that a conventional cad kernel cannot represent are not what SolveSpace is typically brought in for.
What can nTop do that SolveSpace cannot?
nTop covers Implicit modelling, Lattice and cellular structures, Field-driven design, Integrated simulation. SolveSpace covers Constraint solver, Solid modelling, Assemblies, Export formats.

Answered from the vendors’ own pages

nTop: Is nTop the same company as nTopology?

Yes. nTopology rebranded to nTop. The product is the same lineage.

SolveSpace: Is it really free for commercial work?

Yes. It is released under the GPL with no licence fee and no seat limit. Support is community only.

nTop: Does it replace SolidWorks or NX?

No. It is used alongside them. Mainstream CAD handles the conventional geometry and assembly; nTop handles the lattice, field-driven and complex internal structure work.

SolveSpace: Can it replace Fusion 360 or SolidWorks?

No. It handles parts and simple assemblies well. Complex geometry, drawings and supply chain interoperability are outside its range.

nTop: Is there a free version?

No free commercial tier is published. Access runs through a demo and sales process, with academic programmes handled separately.

SolveSpace: What hardware does it need?

Very little. It runs on old laptops and small Linux machines where mainstream CAD will not start.

nTop: Can I buy a perpetual licence?

No. It is sold as an annual subscription, so budget it as recurring cost across the life of the programme.

Share

Related pages

More on nTop

More on SolveSpace

Keep looking

Other head to heads