A log has to make sense later
The point of a mileage log is not a single big number. Months from now you, or a tax pro, may need to see what the miles were for.
Write down the trip, not only the miles
Good records tie miles to work. Note when the shift started, what kind of trip it was, and whether the miles were a pickup, a delivery, a drive back, or another clear work purpose.
The IRS expects a timely log if you claim the mileage deduction. A guess at the end of the year is weak.
Do not rebuild the month from memory
Rebuilding miles from screenshots and bank deposits is slow and easy to get wrong. Log during the shift, or as soon as the shift ends.
On the free GigDecider plan you can log a few trips by hand each day. Pro can track work miles in the background and tie them to offers you accept.
Check that the total makes sense
If your miles jump, ask why. Did you work more, or did the log miss trips or double-count them? A log you can explain is the one you want at tax time.
GigDecider keeps offer reading on your phone. It does not ask you to log in to DoorDash, Uber, or Instacart.