A sample day worked out in your browser. Both twins follow the same plan. Nothing you enter is sent anywhere.
How the schedule is built
The builder takes a typical wake window for the age you pick and spaces the naps and bedtime out from your morning wake time. It gives both twins the same plan, because running them together is what makes their naps overlap.
Treat it as a starting point
Wake windows are a rule of thumb, not a medical schedule. Use the sample day to know roughly when to start winding down, then follow each baby's tired cues. If a baby is fighting a nap, shorten the window a little and see what settles them.