Free tool
Open a backup without Kuriosa
Choose a Kuriosa backup and type your recovery key. Your browser decrypts it on this computer and writes the same files as Export everything: a spreadsheet, CSV and JSON files, and every photo and document.
Works in current versions of Chrome, Edge, Firefox, and Safari. For backups with many gigabytes of photos, use Chrome or Edge on a computer: they write the files straight into a folder.
Keep this tool
Save the tool as one file and open it from your computer, also without internet and even if kuriosa.app is gone. Its SHA-256 checksum shows that it is the file published here:
SHA-256 dde10b901f204850819d219a08795c689f2a5289c3fc801a9ca4ae7eb5b745de