| Name | Lines of code | Maintainability | Test coverage |
| lib/image_optim/bin_resolver.rb | 101 | A 2 hrs | A 92% |
| lib/image_optim/worker/jpegoptim.rb | 55 | A 0 mins | A 92% |
| lib/image_optim/handler.rb | 42 | A 25 mins | A 92% |
| lib/image_optim/bin_resolver/comparable_condition.rb | 43 | A 0 mins | A 92% |
| lib/image_optim.rb | 170 | A 45 mins | A 90% |
| lib/image_optim/elapsed_time.rb | 20 | A 0 mins | A 90% |
| lib/image_optim/cache.rb | 63 | A 25 mins | B 87% |
| lib/image_optim/config.rb | 161 | A 55 mins | B 86% |
| lib/image_optim/worker/svgo.rb | 28 | A 0 mins | B 86% |
| lib/image_optim/worker.rb | 119 | A 0 mins | B 83% |
| lib/image_optim/worker/pngout.rb | 35 | A 1 hr | B 81% |
| lib/image_optim/worker/jpegtran.rb | 34 | A 1 hr | B 80% |
| lib/image_optim/non_negative_integer_range.rb | 9 | A 0 mins | B 80% |
| lib/image_optim/runner/option_parser.rb | 200 | A 35 mins | C 78% |