This solves a real problem that nobody talks about enough: what happens AFTER you download your Gmail backup? Google Takeout gives you a giant .mbox file and then... good luck. Apple Mail can technically import it but it's painfully slow and sometimes corrupts threads. Thunderbird works but feels like overkill for just reading an archive. Most standalone viewers are Electron wrappers that freeze on anything over a few hundred MB. Mbox Viewer takes a completely different approach — it uses a streaming parser that indexes the file once, and after that re-opens it in under a second regardless of size. The Gmail label support is a nice touch since Takeout preserves labels as X-Gmail-Labels headers, and this actually reads them and lets you browse by label. It's native SwiftUI, runs 100% offline, and the search syntax feels like Gmail's own. For anyone who values having a local, searchable copy of their email history — whether for compliance, peace of mind, or just being able to find that one attachment from 2019 — this is worth keeping an eye on.

Mbox Viewer

The fastest way to read MBOX files on your Mac

The fastest way to read MBOX files on your Mac