Features

A complete, native MBOX toolkit

Everything you need to open, search, read and export huge email archives on your Mac — without a web app in a window.

Built for scale

A streaming parser with a 1 MB buffer opens files from a few KB to 50+ GB without ever loading them into RAM.

A binary index with SHA-256 validation makes every re-open take under a second, regardless of size.

Even a 50 GB archive stays under 600 MB of RAM thanks to on-demand streaming and an LRU message cache.

Use from:, to:, subject:, body:, date:, has:attachment, size:>, OR, negation and exact phrases — or the visual filter sheet.

Reads Gmail labels straight from Takeout. Browse by label in the sidebar with live message counts.

The JWZ algorithm groups messages into conversations with visual reply chains up to four levels deep.

Export to EML, CSV (Excel-ready, UTF-8 with BOM) or plain text, and extract attachments in bulk.

Combine multiple MBOX files into one, with optional Message-ID deduplication. Export a single label as its own MBOX.

View attachments inline, preview with Quick Look (Spacebar), save individually or in bulk, or drag straight to Finder.

SwiftUI + AppKit. Dark mode, Drag & Drop, Quick Look, Share, Print and full keyboard navigation. No Electron, no Java.

Everything runs locally. No cloud, no telemetry, no account. Remote images blocked and HTML sanitized by default.

Drop MBOX or EML files onto the app to open them, and drag messages out as .eml or attachments to Finder.

Combine prefixes, operators and exact phrases to pinpoint any message.