Meshy
AI 3D model generator that turns text prompts or images into textured, riggable meshes in about a minute.
Neural4D
Text, image and sketch to 3D generator with a free tier, mesh quality presets, part splitting and export aimed at both game engines and 3D printing.
AI 3D Generation Freemium
Overview
Neural4D is a browser-based generator that turns a text prompt, a photo or a sketch into a textured 3D mesh. It sits in the same bracket as Meshy, Tripo and Rodin, and separates itself mainly on the downstream end: mesh quality presets, a polygon-count control, automatic part splitting, and STL and 3MF export aimed at printing rather than only at engines. There is a genuine free tier, capped at roughly 20 models a month and limited to untextured downloads, with textured export, private models and commercial rights starting on the paid plans.
Key features
A face count you set before generating
Mesh quality is a High or Standard choice and the target face count is typed in, against a stated range of 500,000 to 2,000,000. Polygon count is an input here rather than whatever the model happens to return, which is the difference between an asset an engine can use and one that needs a retopology pass first.
Retopology as a separate step, with a target
A generated mesh can be sent back through Retopo at a lower face target: the help centre's own example takes a model from 1,000,000 faces down to 77,700. That is the operation most generated assets need before they reach a game engine, and here it does not require leaving the tool.
Part splitting
Splits a generated model into separate components instead of returning one fused shell. This matters for printing in more than one colour or material, and for anything that has to move independently after import.
Automatic UV and PBR texturing
The engine places seams and generates base colour, normal, roughness and metallic maps, so assets react to scene lighting rather than carrying colour baked into vertices.
Six export formats, each with a stated purpose
OBJ, FBX, GLB, USDZ, STL and BLEND. The vendor documents what each carries, which is more useful than the list alone: STL is geometry only with no colour, GLB packs geometry, UVs and PBR maps into one file, and BLEND keeps native material nodes.
REST API
Generation can be driven from a script rather than the web interface, available from the paid tiers upward.
Pros and cons
What users consistently praise
- Free tier is a genuine allowance rather than a one-off trial, so the geometry can be evaluated before any payment.
- STL export plus part splitting and an in-tool retopology step make it one of the few generators in this category set up for printing rather than only for engines.
- Face count is set before generating and can be lowered again afterwards, so output does not have to leave the tool to become engine-ready.
- Proper PBR maps rather than vertex colour, so assets light correctly after import.
What users consistently criticise
- Independent reviewers describe cleanup debt: complex or mechanical prompts produce broken edges and intersecting geometry that need fixing in Blender before the asset is production-ready.
- Watertight output is claimed but is prompt-dependent in practice. Organic shapes fare well; thin mechanical parts can still cause slicer artifacts.
- Real-world scale is not guaranteed. Exported files generally need a scale check and adjustment after import, which is a category-wide problem rather than a Neural4D-specific one.
- Almost no independent review-platform coverage, so there is little third-party evidence to weigh beyond individual creator videos.
Recurring themes across third-party user reviews (G2, Capterra, TrustRadius).
Videos
Pricing
Is Neural4D free?
Neural4D is free to start. There is a free tier you can use indefinitely, and paid plans begin at USD 19.9/month.
| Plan | Price | What you get |
|---|---|---|
| Free | USD 0 | 50 credits a week, roughly 20 models a month. Daily generation limit of 8, one concurrent task, low queue priority, and untextured downloads only. |
| Go | USD 19.9/month | 1,500 credits a month, roughly 150 models. Unlocks textured download, private models, commercial use, multi-view, part split and API access. USD 13.9/month billed annually. |
| Plus | USD 39.9/month | 5,000 credits a month, roughly 500 models. USD 27.9/month billed annually. |
| Pro | USD 99.9/month | 25,000 credits a month, roughly 2,500 models. USD 69.9/month billed annually. |
Best for
People generating models to 3D print
STL export, part splitting and a face-count control are the three things that decide whether a generated file reaches a slicer in one piece. Note that STL carries geometry only, so any colour has to come from the printer, not the file.
Anyone testing image-to-3D without paying first
The free tier is real rather than a trial, at roughly 20 models a month. The catch is that free output is untextured and not licensed for commercial use, so it answers whether the geometry is good enough and nothing else.
Developers scripting asset generation
The REST API means batches can be driven from code instead of a browser, which is the difference between a novelty and a pipeline step.
Who should look elsewhere
Anyone needing editable CAD geometry
Output is polygonal. A mesh imports into SolidWorks or Fusion as a reference body, not as parametric features you can edit, and converting it is a separate lossy process.
Hard-surface and mechanical work with tight tolerances
Reviewers consistently report that generators in this category handle organic shapes far better than mechanical ones, producing thin or fragile components on complex hard-surface prompts. Precision parts still want CAD.
Anyone relying on the free tier for client work
Free output is not licensed for commercial use and downloads are untextured. Commercial rights begin on the paid tiers.
Frequently asked questions
Is there a free tier?
Yes. The free plan gives 50 credits a week, roughly 20 models a month, with a daily cap of 8 generations, one concurrent task and low queue priority. Downloads on the free plan are untextured and are not licensed for commercial use.
What does it cost?
Go is USD 19.9 a month for 1,500 credits, Plus is USD 39.9 for 5,000, and Pro is USD 99.9 for 25,000, all checked against the vendor pricing page on 2026-09-03. Annual billing takes 30 percent off, bringing Go to USD 13.9 a month. Credits are consumed per generation, with textured and advanced operations costing more than a plain untextured mesh.
Will the output 3D print without repair?
Sometimes. The vendor documents STL as exporting a watertight, manifold mesh, which is what a slicer needs, but independent reviewers report that complex hard-surface prompts still produce thin or fragile geometry that a slicer handles badly. Organic shapes are the reliable case. As with any generator, check the mesh before committing to a print.
Which formats can I export, and what does each one carry?
Six, and the differences matter more than the list. OBJ writes geometry with materials and UVs in a separate MTL file. FBX embeds mesh and PBR setup for Unity and Unreal. GLB packs geometry, UVs and PBR maps into one binary file for web and real-time use. USDZ targets iOS and visionOS. STL is geometry only, with no texture or colour, for printing. BLEND keeps native Blender material nodes for further editing.
How many credits does a generation cost?
The help centre screenshots show 30 credits for an image-to-3D generation, 30 to regenerate, 10 for AI texture, 20 for AI PBR and 20 for a retopology pass. Since the free plan allows 50 credits a week, that is roughly one textured model a week before any paid tier.
What scale do exported files arrive at?
Not guaranteed to match real-world units. This is worth checking on import rather than assuming, and it is a category-wide issue: a generated object commonly arrives at a size unrelated to the thing it depicts, and the exported format decides how a slicer reads it.
Can I use the output commercially?
On the paid tiers, yes. The free tier is for personal and evaluation use, and free generations are not licensed for commercial work.
Alternatives to Neural4D
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Tripo
AI 3D workspace by VAST that generates textured, riggable models from text, images or sketches in seconds.
Rodin (Hyper3D)
Deemos' AI 3D generator focused on high resolution quad geometry and PBR textures from text or multi image input.
Hunyuan3D
Tencent's AI 3D generator with open weights for self hosting and a commercial cloud API, strongest on hard surface geometry.