Predefined Reports
Simple Custom Reports & Charts app offers ready-made, predefined reports that show useful data to be used without any configuration out of the box. Each set of predefined reports is available to be chosen by opening the appropriate tab. If the app is started from a space menu it will always open up the space tab, while if it is started from a user menu it will open the user tab.
Each tab has reports grouped by Overview and Time Tracking button switches. The estimation type can also be switched as the app detects all your used estimation metrics (this will not be visible if some estimation types are not used).

These predefined reports are not customizable and in case of the need for a custom layout, please usedashboard gadgets instead.
Current Space Report
The current space report set will open if the app is started from the space menu, or the tab is chosen manually. Only work items that belong to a current space are included in these reports.
Report sets will differ based on your space type and board type (in the case of the software space).
Current User Report
The current user report set will open if the app is started from the user menu, or the tab is chosen manually. Only work items that are assigned to a current user are included in these reports. Personal reports are shown for the currently logged user - so each user sees his own stats.
Epics Report
The Epics report set can be opened when the appropriate tab is chosen. All Epics are included in this report and the data is not filtered.
Custom Report
The custom tab allows viewing each type of report that is generated using supplied JQL filter. If you are running Jira Cloud and want to use Adaptavist ScriptRunner JQL functions you should save them and use them as synchronized filters instead via JQL - filter = “enter name or id of the filter“

Several types of reports and charts are available on this tab:
Created and Resolved - this report shows how many work items were created within the selected timeframe and how many of those work items were resolved. Note, that resolved number does not include work items that were created outside this selected timeframe.
Resolution Time - reports how much time has passed between the work item resolved and the work item created times. Note, that this report does not include working hours and counts this time as is. Resolution times are specified in hours and rounded upwards so that work items resolved in under half an hour are also included (in this case resolution time shows as 1 hour).
Work Items By - shows pie charts and reports based on the most used work item fields. More reports can be added by clicking "+ Add/Remove Fields". This can only be done by a user with admin rights. Default fields also depend on a space type - so the service desk space includes more fields, related to SLA.
Burndown/Burnup - Shows Burndown/Burnup reports. Read the documentation aboutdashboard gadgets for more information.
Individual Velocity - Shows velocity reports. Read the documentation aboutdashboard gadgets for more information.
Time Tracking Estimation - Shows time tracking estimation stats. Read the documentation aboutdashboard gadgets for more information.
Time Tracking Timesheets - Shows timesheets grouped per chosen field (worklog author, assignee and etc.) to track your spent time.
Age Reports - Lists work items not resolved or not updated for a certain time (e.g. 1 week, 2 weeks and etc.). Also lists assignees for those work items.
Created and Resolved and Resolution Time reports can also be viewed under different time units - day, hour, week, month, the day of the week. Hour reports are based on 24 hours. Week reports are based on the week number from the start of the year.
Work Items By reports also show a pie chart for selected reports, except for key and summary reports. Also, a chart will not be shown if there is a single value in the table.
A graph on a chart can be hidden by clicking the graph label - e.g. to hide resolved work items graph, click the resolved label.
Values that charts are based on are displayed in a table. You can use table search to find the value you require if it is not displayed on the first page. One of the default fields - the summary is included, so if you need to make a report on a certain work item with a known summary, you can select this work item by using the summary field as a filter.
Default fields also include the key report. This report shows work item keys that the reports are based on. Clicking on a key opens up the work item.
Dashboard Gadgets
Most of the reports that are available in predefined sets can be used asdashboard gadgets . Use dashboard functionality in Jira to create a customized report layout.