File processing
CSV, TSV, XLS, XLSX and ODS file contents are sent to this application’s server for parsing and comparison. For spreadsheet inputs, you can compare one selected worksheet by key or compare every usable worksheet paired by exact, normalized or year-insensitive tab names. Whole-workbook comparison uses a shared key of one to three identifier columns only when it is populated and unique in both sheets; otherwise it pairs rows with unique identical values and formulas across row order. Edited or duplicate rows use nearest source position, and large unmatched sections use source order. The whole-workbook summary includes every changed cell, per-sheet counts and the row-matching method. Confirm a suggested key identifies stable records; the report discloses when source positions are used for ambiguous rows. Formulas use saved results by default, with formula-text comparison available when both inputs are workbooks. Formulas are never recalculated, and cells without saved results require formula-text mode. They are not sent to an AI service. Anonymous comparisons are processed in memory and are not saved to the application database. Browser tab memory retains inputs until you reset or leave. No file contents are placed in browser local storage.
Saved reports
When a signed-in user chooses Save report, original compared values, rules and input fingerprints are encrypted at rest in the server database. New reports expire after seven days on Free or 90 days under the proposed Pro plan. Paid subscriptions are not available in this public beta. Expired reports are deleted on requests and a 15-minute background sweep. The expiry saved with each report does not change when a subscription changes. Free accounts can store 25 reports and 10 rule profiles; the proposed Pro plan allows 250 reports and 100 rule profiles. Encrypted database backups are created daily on the same VPS and retained for up to seven days. Deleting live records does not immediately remove older backup copies. Backups do not include the encryption key, and there is no off-site disaster recovery copy configured.
Accounts and cookies
The beta stores your email address, salted password hash and saved profile settings on the application server. Email ownership must be verified before saved rules or reports can be accessed. Verification tokens are stored as SHA-256 hashes and expire after 60 minutes or one use. From the sign-in form, users can request a password-reset email; responses do not disclose whether an account exists. Reset tokens are stored as SHA-256 hashes, expire after 20 minutes, can be used once, and revoke existing sessions when completed. If the mail channel is not configured, no email is sent. A session cookie lasts up to seven days. There are no advertising scripts or third-party analytics. Infrastructure may retain access metadata; the application does not log uploaded bodies.
Optional problem feedback
The Feedback button creates a preview image of the current website viewport in tab memory. Password fields and account dialogs are excluded. Visible file values may still appear; review or remove the image before sending. With your explicit agreement, your description, optional reply email, page path and optional screenshot are emailed to mysave@qq.com through the operator’s mail server. URL query strings and fragments are excluded. These contents are not stored in the application database. A submission identifier, content fingerprint and delivery status are retained for up to 30 days to prevent duplicate sends, then purged on feedback requests. The recipient mailbox and mail service may retain delivered messages; deleting an application account does not recall email. An SMTP acceptance response does not establish inbox delivery.
Deletion and support
Delete individual reports or profiles from your workspace. Account deletion requires your password and removes account records, sessions, profiles and reports from the live application database. Do not upload sensitive production data to this public beta. The free comparison tool is available now; paid subscriptions are not available. For questions about file handling, retention or account deletion, contact support.