Call me old-school but I log everything in A4-size notebooks. Every brew has a new starting page and generally goes on for 3-4 pages. Every entry has date/time first and everything gets logged, incl. tastings (flavour, aroma, colour etc.).
I I use a recipe program online (I do now) I print out the recipe and cut it out and tape it on to the page. Same goes for water-chemistry calculation (I cut it out into 3 columns of very small type so it can fit on 1 page).
Having a notebook like this is superior to online solutions in many ways. E.g. 100 years from now my progeny can poor over my notes and reproduce the beer if they want (no, it's not THAT good, yet :lol: ). Also I can spill beer on it without too much trouble and it is not susceptible to virus, hackers, varying electronic storage mediums being outdated or some cloud-service going bust.
Whatever you decide to do, make sure you log 'everything'..