An Anvilfield Android app. Offline core calculation, one-time Pro unlock, no subscription, no ads.

Know the compaction window before the mat goes cold

MatWindow takes mix, lift thickness, delivery temperature, base temperature, air temperature, wind, sky, date, time, and latitude, then calculates the minutes available before the mat reaches the stop temperature.

Cooling curve

Window countdown, 175 F stop line, and field verdict.

Roller plan

Pass count, target speed, and cover length for the active window.

QC export

On-device PDF log with inputs, plan, conditions, and optional field photos.

Data and privacy

MatWindow stores jobs, settings, custom mixes, and optional attached photos locally on the device. It has no account, no backend, no analytics, and no ads. Purchases are handled by Google Play Billing.