Toolwatch answers one question well: how far off is this watch running. Sync a mechanical piece to atomic time, come back a day or a week later, and the app calculates deviation in seconds per day, stores the measurement history and compares the result against other examples of the same caliber. It is free on iOS and Android, cited by watchmakers, and the developers reported that roughly a quarter of watches measured through the service were outside factory specification, which is a decent argument for checking a piece still under warranty.
Best treated as a diagnostic companion rather than an inventory system: entries hold basic watch data, and collectors with long lists complain about limited sorting and grouping plus a login that resists being used on two devices. No valuations, no wear statistics, no service invoices.
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