Drafted with AI from the Nemos app and its documentation. Details about other apps can change, so check their sites.
Tana is a powerful outliner. Its supertags turn notes into structured records that you can query, which is great for people who like modeling their work. It also takes time to learn, and that is the barrier you are probably feeling.
Nemos asks for very little. There is no schema to design. Tap Share in any app and choose Nemos, or take a screenshot, or record your voice. Later, type what you remember into one search. Smart folders can sort things for you, and if you want your own folders, they are there.
Any item can have a reminder, so you do not need a task system to get things back at the right time. The trade-off is real. You cannot build custom fields, views or queries in Nemos, and it only runs on Apple devices.
When something else fits better: if you only need to jot things down, Apple Notes is simpler still. If you run a team's work, Notion's templates are a gentler way into structure than Tana.