Two AI patent drawing generators in the same category. The differences are in what happens after generation: compliance checking, iterative editing, export formats, and data policy.

The honest starting point: the core generation job is similar.
Both accept photos, sketches, and CAD-derived images and produce black-and-white patent line art.
Both target 37 CFR §1.84-style output as the baseline.
Both generate first drafts in minutes rather than the 7–10 days of a drawing service.
PatentDrawingAI maintains a strong article library on costs and examples; PatentFig AI publishes office-by-office guides.
The differences show up after the first draft is generated.
Validate figures against USPTO, CNIPA, EPO, JPO, KIPO, and PCT rules before filing, not just USPTO.
Ask for a targeted change — move a numeral, fix a hatch — without regenerating the whole figure.
Design view sets keep proportions and numerals consistent across front/rear/side/top/bottom/perspective.
SVG, TIFF, PDF, and PNG export, with a stated policy of not training on user data.
Based on each product’s public materials as of 2026 — verify current features with the vendors.
Honest comparison
Generate a figure from your own photo or sketch, run it through the six-office checker, and judge the output.