Silksong save analyzer: your 100% and what's missing
Import your save file and the site tells you your completion split into the game's ten categories (Tools, Silk Spools, upgrades, abilities, Crests, masks, the Needle…), and each thing you're missing, with its Act and its area. It counts as the game does: whole masks and spools, not loose shards, and a Tool and its upgrade as one point.
Import your save ›Four saves, as in the game, and their restore points too. In Chrome and Edge it can follow the file: when the game saves, the site catches up and tells you what you got since the previous save.
Questions
Where is my save file?
On Windows, in %USERPROFILE%\AppData\LocalLow\Team Cherry\Hollow Knight Silksong; on macOS, in ~/Library/Application Support/unity.Team-Cherry.Silksong; on Linux and Steam Deck, in ~/.config/unity3d/Team Cherry/Hollow Knight Silksong. Inside, a folder named with a number and the files user1.dat to user4.dat. The site walks you through it when importing.
Is it free? Do I need an account?
Free, no account and no ads. Your save never leaves your browser: it's read there and kept there.