100% client-side & Zero-PHI:Data stays in your local browser storage. Client-side processing by design — avoids server-side PHI ingestion. No login required.
Visit Window Calculator
Compute target visit dates and ± windows from an anchor date — calendar math only, never subject identifiers.
Calculate Protocol Visit Windows From an Anchor Date
Every protocol defines visit windows as an offset from an anchor date — day 1, randomization, last dose — and manually counting out a ± window for each scheduled visit is tedious and easy to get slightly wrong, especially across multiple subjects with different anchor dates.
Visit Window Calculator takes an anchor date and the protocol's defined window and returns the full visit schedule with allowable ranges — a quick reference for scheduling without redoing the math by hand every time.
Calculations run entirely in memory in your browser — nothing is stored or transmitted, no login required.
Who this is for: CRCs scheduling protocol visits and confirming a visit falls within window before it's logged as a deviation.
Site workspace backup
Saved in this browser’s localStorage on this PC — export before switching workstations; clear on shared kiosks when done.
Download works without an email — nothing ever uploads.
1. Inputs
Use a protocol anchor only (baseline / randomization / cycle start). Do not enter subject IDs, names, or initials.
2. Window result
Enter a valid anchor date, or load the sample.
3. Quick schedule generator
Builds a recurring visit table from the same window limits. Saved with this workstation workspace.