Terms of use

Last updated: 24 May 2026.

SuperDeDuper is a free, open-source personal project shared as-is. By downloading, installing, or using the app, or by using the website at superdeduper.io, you agree to these terms.

The software

The desktop app and source code are licensed under the MIT License. The full text ships with every release and is also available in the LICENSE file of the source repository.

In short: you can use, copy, modify, and redistribute the software freely, with one condition — the copyright notice and license text must be included.

No warranty

This software is provided "as is", without warranty of any kind. SuperDeDuper performs destructive operations on your files. While the defaults are reversible (Recycle Bin, archive with manifest), bugs in this codebase can — and given enough use, eventually will — cause data loss.

You are responsible for backing up your data before running SuperDeDuper. You are responsible for reviewing what the app proposes to delete before confirming. The authors accept no liability for lost data, damaged files, or any other harm arising from use of the software.

The leaderboard service

The leaderboard at superdeduper.io/leaderboard and the API at api.superdeduper.io are best-effort hobbyist infrastructure. We don't promise uptime, throughput, or response latency. Submitted data is stored and processed per the privacy page.

Rate limits

The API enforces rate limits to prevent abuse — currently 12 submissions per hour and 200 per day per install, 5 registrations per hour per IP, and a payload size cap of 2 KB. Limits change over time as we observe real traffic patterns. They are not a service guarantee in either direction — we may tighten them without notice if abuse appears, and we may loosen them without notice if traffic supports it.

Acceptable use

Don't do these things; they're either pointless or actively adversarial:

• Submit fake, manipulated, or modified-binary benchmark results.
• Attempt to bypass HMAC signing, registration proofs, or anti-cheat sanity checks.
• Claim achievements (via easter_egg_hits or otherwise) that the underlying scan did not actually qualify for.
• Use the API for purposes other than leaderboard submission from a real SuperDeDuper installation. The schema and endpoints are public; building tooling on top is fine. Spinning up a bot to inflate the dataset is not.
• Scrape, mirror, or republish leaderboard data in bulk without permission. The dataset will be published as periodic anonymized aggregates per the privacy page.

Enforcement

We reserve the right to shadowban (accept your submissions, return success, but omit them from public leaderboards and Pathfinder grants) or hardban (refuse future submissions outright) any install_id or account that violates these terms. Clear-cut cases get a hardban; ambiguous cases get a shadowban while we observe more behavior. Appeals go to the contact email below.

Honest use is the only intent — almost nothing you do in good faith will be a problem. The enforcement language exists because Pathfinder hall-of-fame slots and public leaderboard ranks have real reputational value, and we'd rather have stated policy in writing than make it up after an incident.

Account deletion

You can delete your install record and every submission attached to it at any time. See the privacy page for the procedure (by email at G1; self-service in-app from G3 onward). Deletion is irreversible.

Open source contribution

Pull requests and issues against either repo are welcome. By submitting a contribution you license it under the same MIT terms as the rest of the project. We don't ask for a CLA.

Changes to these terms

We may revise these terms as the project evolves. Material changes will be announced in the app's release notes and the "Last updated" date above will change. Continued use after a change constitutes acceptance.

Contact

Questions, deletion requests, appeals: mickfixesjunk@gmail.com. Bug reports + feature requests: GitHub Issues.