Public contact

One address for product, trust, and corrections.

Legal operator
Usefo Inc.
Registered region
Taiwan
Do not send
Passwords, API keys, private source code, raw analytics exports, or store credentials.
Email request

Open a direct email request.

The website does not publish an unverified contact form or data-retention claim. Use a clear subject, identify the affected product or page, and attach only sanitized evidence needed to explain the issue.

Open email client
Useful context

What to include.

Release, scope, sanitized evidence, and the outcome you need are normally enough to begin.

01

Release

Desktop platform, app version, installer source, and whether the build was signed or verified.

02

Scope

The affected product, permanent license, domain, app, public page, or policy section, without credentials.

03

Evidence

Steps, expected behavior, actual behavior, affected URL, and sanitized screenshots, logs, receipts, or supporting facts.

04

Requested outcome

The product answer, correction, privacy response, security review, refund, or technical result you need.