FlowLens

Kanban flow metrics,
entirely in your browser

Drop in a CSV from any work management system. Get instant cycle time, throughput, WIP, aging work, and a Cumulative Flow Diagram. No login. No server. No data leaving your machine.

Download Flow Lens
Single HTML file · open in any modern browser · free ·
Your data stays on your machine. Flow Lens runs entirely in your browser — your CSV is never uploaded anywhere. You can even disconnect from the internet after downloading and it still works.

Cycle Time

Percentile-based control chart and histogram. See p50, p70, p85, p95 and spot outliers instantly.

Throughput

Weekly completion rate bar chart. Understand your team's delivery cadence over time.

Cumulative Flow

Interactive CFD with clickable markers. Select any date range to analyse WIP and completions.

Aging WIP

See every item in progress, how long it's been there, and which stage it's stuck in.

How to use it

  1. Click Download above and save the file somewhere handy.
  2. Open flow-lens.html in Chrome, Edge, Firefox, or Safari.
  3. Drop your CSV onto the page. Map your columns in the Config panel.
  4. Done — all charts update immediately.
Data format guide Security & data handling View on GitHub