These options allow you to enable logging of activity to a CSV file that can be imported and analysed in another application (e.g. Numbers or Microsoft Excel)

Log to file

Log activity to a fileWhen this checkbox is enabled, average latency values will be written to file(s) in Log location.
Log location

The location to store the log file.

Note: Due to the requirement for App Sandboxing, you must click Choose... to choose a location for the files to be stored, otherwise PeakHour will not be granted permission to write there.

Reveal in FinderOpens the chosen folder in Finder.


These options determine how often data is written to the file and (optionally) how often the files are rotated.

Write to log everyHow often to write a new record (line) in the CSV log file.
Rotate log fileHow often to start a new log file.

Log filename

Log files are always stored in the Log location folder and have a different filename format depending on the log rotation frequency:


<Target Description> YY-MM-DD HH:MM.csv


  • YY-MM-DD is the date in Year-Month-Day
  • HH:MM is the time in Hour:Minutes

<Target Description> YY-MM-DD.csv


  • YY-MM-DD is the date in Year-Month-Day

<Target Description> YY-MM-DD w.csv


  • YY-MM-DD is the date in Year-Month-Day
  • w is the number of the week.

<Target Description> YY-MM.csv


  • YY-MM is the date in Year-Month

<Target Description> YYYY.csv


  • YYYY is the year

Target Description is the description you've entered on the Target tab.

Log format

The log file contains the following fields:


The date and time of the entry in your localised time format.
TargetThe description of the target.
Average Response Time (ms)The average latency / response time over the period.