Comparison
SpeakCAD vs Backflip AI: describe a new part, or rebuild an existing one as CAD
Backflip, from a team with a background in carbon-fibre 3D printing, trains a foundation model for CAD. Its tools reverse-engineer things that already exist: a 3D scan or mesh, a few photos with one known dimension, or an engineering drawing becomes a parametric model with a feature tree (in its web app or its Autodesk Fusion add-in) or a STEP file. SpeakCAD starts from a description of the part you want to print, and ends with an STL, a 3MF or G-code.Updated 23 September 2026
Sources, checked on 23 September 2026: Backflip · Backflip pricing
| Criterion | SpeakCAD | Backflip AI |
|---|---|---|
| Audience | People with a 3D printer, no CAD skills assumed | Engineers who work in CAD (Fusion today; Onshape announced) |
| Where it runs | Browser on any phone, tablet or computer; nothing to install | Web app and an Autodesk Fusion add-in |
| Inputs | Text, photos with a ruler to copy a part, STL/3MF/.scad uploads | 3D scans and meshes (STL, OBJ, GLB, GLTF, PLY), photos with one known dimension, engineering drawings |
| Editing | Chat: say what to change, the rest stays; typing a new number in the dimensions panel is free | Edit the generated feature tree in your CAD software |
| Printability | Wall thickness, clearances, flat base and overhang rules applied by default | Optimised for 3-axis CNC and turned parts (their words) |
| Output | STL, 3MF, OpenSCAD source, G-code sliced for your printer | Native parametric feature tree or STEP |
| Sliced G-code | Yes, for 380+ printers: included in Pro and Unlimited, +5 credits per slice otherwise | No |
| Parametric | Yes, named OpenSCAD variables | Yes, a feature tree with sketches and constraints |
| Test the fit before a long print | Fit Check: free 5-minute test slice of the fit, then your printer's calibration is applied to every model | No: reprint, or cut a test piece yourself |
| Free to try | Live demo (3 AI edits of a real part, no account); 650+ ready-made library models open in a free account and resize in the viewer; your own parts and downloads use credits | 50 credits at sign-up, no card |
| Price | Starter credits $5 once (75 credits); Pro $9.99/mo; Unlimited $24.99/mo | Builder $20/mo (100 credits); Pro $50/mo (300 credits); a fast job is 10 credits, a thinking job 50 (check their site) |
Reverse engineering or describing
Backflip is built for an engineer who has a thing and needs its CAD: a scan of a casting, a drawing from a 1990s archive, a part on the bench photographed with a known dimension. The result is the feature tree they would have modelled by hand, ready to finish in Fusion, or a STEP file for manufacturing.
SpeakCAD is built for someone who needs a printed part and does not use CAD at all. You describe it with the numbers you measured, the AI writes a parametric OpenSCAD program, and the output is a file for the slicer or already sliced G-code.
Where Backflip wins
- Scan to CAD with a real feature tree. A mesh becomes sketches, constraints and features, not a rebuilt approximation.
- STEP and native CAD for machining, sheet metal and assemblies in professional software.
- Engineering drawings to 3D, which SpeakCAD does not do.
- It lives inside Fusion if that is where you already work.
Where SpeakCAD wins
- No CAD needed at any step. Describe, check, change by chat, download.
- The phone. The whole editor runs in a phone browser.
- Printing. Print rules are applied by default, Fit Check calibrates fits to your printer, and G-code is sliced with official profiles for 380+ printers.
- Cost for occasional parts. Starter credits are $5 once for 75 credits, no subscription.
Copying a broken part
Both can start from photos. Backflip's Photo-to-CAD gives an engineer a CAD model to finish. SpeakCAD's duplicate flow (two photos and a ruler) gives a printable file directly, and you correct any dimension by chat.
Verdict
Choose Backflip if you work in CAD and need a scan, photo or drawing turned into a feature tree or STEP. Choose SpeakCAD if you need a printable part and would rather describe it than model it.Other comparisons
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