| Name | Lines of code | Maintainability | Test coverage |
| lib/roo/formatters/csv.rb | 81 | B 4 hrs | |
| lib/roo/excelx/cell/number.rb | 83 | A 3 hrs | |
| lib/roo/excelx/cell.rb | 93 | A 1 hr | |
| lib/roo/utils.rb | 99 | A 1 hr | |
| lib/roo/csv.rb | 102 | A 0 mins | |
| lib/roo/excelx/shared_strings.rb | 109 | A 3 hrs | |
| lib/roo/excelx/sheet.rb | 118 | A 45 mins | |
| lib/roo/excelx/sheet_doc.rb | 174 | B 6 hrs | |
| lib/roo/excelx.rb | 294 | D 1 day | |
| lib/roo/open_office.rb | 453 | F 5 days | |
| lib/roo/base.rb | 460 | D 2 days |