Seatbelt 0.9.12

20 October 2026

• Redesigned Transfer Logs
  • Every offload is listed by day, with its files in folders you can open and collapse.
  • Filter by what happened to each file, behind a discreet filter button.
  • New inspector panel shows every ASC MHL generation for the selected destination, with operations as a timeline.
  • Cancelled transfers show which files were not copied.
• Redesigned Light Mode
  • Clearer layers, calmer shadows and standard macOS controls throughout the main window and Transfer Logs.
• Redesigned Sequences
  • Clearer layout that shows how each sequence fans out.
  • Fully drag and drop: drag a destination onto another to chain it, and drag it out to detach it.
  • Each sequence is grouped under one row in the transfer list. A failed copy no longer stops the rest, and can be retried.
• Safer copying
  • Files are written as .sbpart and only get their real name after they have been verified, so a failed copy can never be mistaken for a good one.
  • Keep Both is now the default when a different file with the same name already exists at the destination. Overwrite and Skip are still available in Settings.
  • Keep Both copies are recorded under their real name in logs, ASC MHL and script hooks, and are restored correctly after a relaunch.
  • Re-running a transfer no longer creates duplicate Keep Both copies.
  • Transfers keep the settings they were added with, even if you change Settings later or relaunch the app.
  • Two transfers never write into the same folder at once; the queue waits and tells you why.
• ASC MHL
  • Every finished transfer is now recorded in ASC MHL, including transfers where some files failed. Failures are recorded as metadata.
  • Files that are originated into a history are checked against the source.
  • Seatbelt’s working files are ignored in manifests.
  • XXH128 is now the default hash type. SHA-256 has been removed, as ASC MHL does not support it.
• What’s New tour that shows new features after an update
• Full path shown when hovering folder names in the transfer list
• New app icon
• Fixed time remaining showing far too long at the start of fast transfers.
• Fixed Skip and “Keep modified” overwriting the file you chose to keep.
• Fixed a missing source being guessed instead of reported.
• Fixed PDF report file filtering.
• Fixed a stutter in the sidebar.
• General improvements and stability fixes.

Known Issues:

• Scripting support is work in progress, please report missing features or workflows
• Files in Dropbox and other cloud-synced folders that are not downloaded to the Mac can fail to transfer. Support for cloud files is coming in a future update.