Plans
Start free. Grow with your projects.
The comparison tool needs no account. Free Projects include editable originals, revision history and optional STEP to STL conversion.
No account
Free
Local STL, OBJ and 3MF comparison. Inspect geometry without uploading your files.
Open Free Diff ToolFree account
€0
1 project · 20 revisions per project
500 MB storage
More roomPRO
€5 / month
Or €50 per year. Early access pricing.
10 projects · 100 revisions per project
2 GB storage, approval workflows and email notifications.
Availability and checkout are shown in your account's Plan & billing page.
View account plansEverything, side by side
Scroll the table horizontally to compare all plans.
| Feature | Without account | Free account | Pro |
|---|---|---|---|
| Automatic STEP to STL conversion Optional per project; STEP up to 10 MiB, original retained; existing storage limits apply | Free account required | Included | Included |
| Revision originals and downloads Up to 10 originals, 100 MiB per package; uses existing storage allowance | Shared source links only | Included | Included |
| Browser agent tools (experimental) Requires a WebMCP-enabled browser; existing permissions and limits apply | Comparison tools | Project and comparison tools | Project and comparison tools |
| Local two-model comparison | Included | Included | Included |
| STL, OBJ and 3MF support | Included | Included | Included |
| Third model and pair switching | Sign in required | Included | Included |
| Cloud Projects One model or part, with the history of its revisions | Not available | 1 Project | 10 Projects |
| Revisions per Project | Not available | 20 revisions | 100 revisions |
| Cloud model storage Identical uploads are stored once and charged once | Not available | 500 MB | 2 GB |
| Active review links Revoking a link, or letting it expire, frees the active slot | Standalone sharing | 1 active, 3 new / 30 days | 10 active, 50 new / 30 days |
| Rounds in one review link Any number of reviewers. A reviewer never pays and never signs in | 20 rounds | 20 rounds | 20 rounds |
| Review link lifetime | 7 days | 7 days | 30 days, extendable |
| Send review by email Manually send a review invitation from info@stl-diff.com. Sending limits apply | Pro required | Pro required | Available, with sending limits |
| Email notifications Owner enables notifications for all participants. Recipient plans do not matter | Not available | Not available | Project activity, when enabled |
| Review before publishing Every upload becomes a proposal; an owner or editor approves it before publication | Not available | Not available | Optional, per project |
| Enterprise API access | Not available | Not available | Available on request |
Project allowances belong to the owner. Read the guides for source access, conversion limits and collaboration roles.