I’ve always self filed our company accounts through the HMRC Online Portal that is now closing, the calculations aren’t terribly difficult and if we’ve put all of the information into QuickFile correctly it’s usually easy to find the values I need to compute.
If anyone has any recommendations for software or options to keep self filing accounts in this way please do share them here (or feel free to message me) otherwise the QuickFile year end accounts service is quite reasonably priced compared to software licences for single companies for single years.