Plan the week by job, and let the planner catch the clashes.
Tempbench's week planner shows jobs down the side and days across, with how many people are booked against how many are needed. Click a day to book people, or book someone for the whole week. It blocks double bookings, Do not use and days off, and warns about expired documents and a seventh day in a row.

Green is full, amber is short, grey is nobody yet, hatched is not a shift day.
Click a day. Book from the right list.
The booking panel lists the people already on the job, then suggested matches, nearest first. Each has Book and Book the week. Anyone who cannot be booked says why.
Blocked
- Overlapping shifts, overnight included
- Do not use
- Inactive people
- Closed jobs
- Days off, unless you tap They've said yes
Warned
- Expired documents
- Seven days in a row
- Outside the job's shift days
- Job already full
A booking sets the day to booked on their week and moves them to Booked on the job. Cancelling gives the day back.

By job or by person, and on a phone.
By job is the grid above. By person lists everyone working this week, one row each, so you can see who is on six days and who has a gap.
On a phone the planner shows one day at a time with the week across the top, so you can check Thursday from the car.

Questions.
Does the planner stop overnight shifts clashing?
Yes. A night shift such as 20:00 to 06:00 runs into the next morning, and the planner treats it that way. Booking that person on an early shift the following day is blocked as an overlap, the same as two shifts on the same afternoon.
Can I book someone who has said they are off?
Yes, if they have told you they can do it. People who are off that day show with a They've said yes, book anyway button. Do not use, inactive people, closed jobs and overlapping shifts cannot be booked at all.
Is there a view of each person's week?
Yes. Switch from By job to By person to see everyone with a booking this week, one row each, with every shift they are on. Search for a name to add someone to the view and see their week, even with nothing booked.
Try it with your own week.
Load the sample agency in one click or import your spreadsheet. 30 days free, no card needed.