Blob0 — S3-Compatible Desktop Client for macOS

Blob0 is a macOS desktop application that lets you manage S3-compatible object storage the way you manage local files. It connects to Cloudflare R2, Amazon S3, and MinIO buckets, then presents their contents in a Finder-style browser where you can create folders, upload files, preview objects, and share them. Credentials are stored in the macOS Keychain rather than in plaintext config files. The app also ships a CLI and an Agent Skill for Claude Code, Codex, and Cursor, so the same storage operations can be driven from a terminal or an AI coding agent.

What is Blob0?

Blob0 is a macOS file manager for S3-compatible object storage. It takes bucket credentials and object keys as input and produces a browsable, editable view of remote storage — folders, files, sizes, and previews — that behaves like a local filesystem. It runs natively on macOS and supports Cloudflare R2, Amazon S3, and MinIO endpoints. The page does not name the company or developer behind the app.

Key Features

• S3-compatible browsing — Connect to Cloudflare R2, Amazon S3, and MinIO buckets and navigate them with a folder tree and file list, including per-bucket totals such as folder count, file count, and total size.
• Local-style file operations — Create new folders and upload files directly from the app's toolbar, mirroring Finder interactions on remote objects.
• Object preview — Preview stored objects inside the app before downloading or sharing them.
• Sharing — Share objects from the app without leaving the interface.
• Keychain credential storage — Storage credentials are kept in the macOS Keychain instead of being written to disk in plaintext.
• CLI — A command-line interface for driving the same storage operations from a terminal.
• Agent Skill — An integration for Claude Code, Codex, and Cursor that lets AI coding agents operate on S3 storage.

Who is it for?

• Developers working with R2, S3, or MinIO — Inspect and clean up bucket contents without writing ad-hoc scripts or opening a web console.
• Mac-based ops and DevOps engineers — Upload build artifacts, backups, or config files to object storage from a desktop file browser.
• AI coding agent users — Give Claude Code, Codex, or Cursor an Agent Skill so the agent can read and write S3 objects as part of a coding workflow.
• Teams sharing stored assets — Preview and share objects from a bucket without granting console access.

What can you do with Blob0?

• Bucket cleanup: Browse an R2 or S3 bucket, spot stale folders such as a backups directory, and delete or reorganize objects without a terminal.
• Asset upload: Drag files into a bucket folder and confirm the upload from the same window.
• Agent-driven storage tasks: Point Claude Code or Cursor at a bucket via the Agent Skill so the agent can fetch or write objects during a coding session.
• Scripted transfers: Use the CLI to move objects between S3-compatible endpoints in automated jobs.

Pricing

Not specified. The macOS download is listed as "Coming soon" on the page.