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FreeAny S3-compatible storageOpen source coming soon

Access to your S3 storage. For you, your team, your AI. Never your keys.

One place for every bucket you own on AWS S3, Cloudflare R2, Backblaze B2, Wasabi, MinIO and any S3-compatible endpoint. Nothing to host, nothing to install, nothing to pay. Or run it on your own server, soon.

Open Stream Vessel Cloud Add to Chrome Free. No subscription, no per-user licensing.
Who has access
s3://acme-prod-assets/
Live example
Example: who has access to s3://acme-prod-assets/
Who Level Scope Ends
YouCloud · any device
 FULL / never
Claude CodeMCP token · 16 tools
 WRITE / Fri 18:00
Presigned linkquarterly-report-2026-q1.pdf
 READ 1 file in 1 h
[email protected]Shared connection
 READ projects/alpha/ until revoked
Access key AKIA••••••••••••3F2Q  stays with you. Nobody above has seen it.

Your access

Available

Sign in to Stream Vessel Cloud from any device, or use the Chrome extension and keep your keys on your machine.

AI access

Available

Give Claude Code, Cursor or any MCP client a scoped token that expires, with every call logged.

Team access

Available

Share a folder with a colleague at read, write or full without handing over keys, or send a link that expires.

The work itself

Work in your buckets, not around them.

Provider consoles page out at a thousand objects and search one prefix at a time. This is the part they never built.

Two-pane explorer

Folder tree, file list, breadcrumbs with the real s3:// path, back and forward. Built for millions of objects with virtual scrolling and lazy loading.

Search a whole bucket

Wildcards, full-path matching, live results, and a cost-aware pause so a search never runs up your bill.

Edit in place

A code editor with syntax highlighting saves straight back to the bucket.

Preview without downloading

Images, video, audio, PDF and text open where they are.

Move anything

Upload files and folders by drag and drop, large files in parts, with a progress panel that groups failures and retries them in one click.

Cut, copy, paste

Between folders, buckets and even different providers. A transfer panel shows every file, with a Stop that keeps what already copied and a Retry for what failed.

Fix metadata

Read and edit object metadata without re-uploading.

Scoped connections and Assume Role

Expose one s3://bucket/prefix/ as a whole connection, or assume an AWS role with an external id.

Several panes side by side

Open as many panes as your window fits, each on its own connection, bucket and folder. Drag between them; a drag across connections always copies. Your panes come back after a reload.

Everything the S3 browser and file manager does →

Two explorer panes on two connections, two files selected in the left pane, and the toolbar showing preview, download, send to Drive, copy, cut, link and delete
Four ways to run it

Run it where you want. Keep keys where you want.

Same code, same explorer. What changes is who holds the keys and whether there is a server at all.

Available

Stream Vessel Cloud

Sign in and go. Nothing to install. Hosted by us; your files stay in your buckets.
  • Any device, phones and tablets included
  • Keys encrypted on our servers with AES-256
  • Bucket CORS configured for you
  • Everything, including AI access and sharing
Open Stream Vessel CloudLearn more
v1.7

Chrome extension

No account. Keys never leave your device.
  • Talks to your storage directly, no server in between
  • No CORS setup
  • Asks for one host at a time, only when you connect
  • The same explorer, editor and transfers
Add to ChromeLearn more
Coming soon

Desktop app

The extension, as a native app.
  • Windows first, macOS and Linux to follow
  • Keys in your OS keychain
  • No browser, no account
Notify meLearn more
Coming soon

Self-hosted

Run it on your own domain.
  • Open source · soon
  • AGPL-3.0, Docker Compose
  • Your server holds the keys
  • Free for teams under 30 users
Notify meLearn more
AI access

Give your AI a door, not a key.

Create a token with a READ, WRITE or FULL tier and an expiry. Paste it into Claude Code, Cursor, VS Code or any MCP client. Your agent gets 16 tools to list, search, read, write, copy, move and delete objects, and you get an audit log of every call. Revoke in one click.

  • Expiring tokens: 30 days, 90 days, a year, or a date you pick
  • Audit log of every call
  • Revoke any time
  • No access keys in any config file

Works on connections shared with you too, at the lower of the token's tier and the share's level.

Coming soon  Restrict a token to specific connections, buckets and prefixes.

How the MCP server works → Why AI should not hold your S3 keys → 
# Claude Code, one line. The token expires Friday.
claude mcp add stream-vessel \
  --transport http https://app.streamvessel.com/mcp \
  --header "Authorization: Bearer svmt_…"
Discover
list_connections
list_buckets
list_objects
find_objects
stat_prefix
Read
read_object
get_object_metadata
create_download_link
Write
write_object
set_object_metadata
create_upload_link
copy_object
move_object
Delete
delete_object
delete_objects
delete_prefix
Team access

Share access, not secrets.

How to share S3 access without keys →

Providers

Any provider. And Google Drive, both directions.

Custom endpoints, FIPS and dual-stack on every connection.

AWS S3Cloudflare R2Backblaze B2WasabiMinIODigitalOcean SpacesIDrive e2Any S3-compatible endpoint
Google Drive Cloud and extension

Import files from Drive straight into the folder you are browsing, or send files from your storage to a Drive folder, without downloading them first. Choose the destination once, then send again in one click. Desktop app: coming soon.

Copy files between providers and Google Drive →

The file menu with Send to Google Drive and its Choose a folder submenu
Trust

Where your keys live.

Two security models, stated plainly. Pick the one your policy allows.

CloudAvailable Self-hostedSoon Chrome extensionAvailable Desktop appSoon
Your access keys Encrypted with AES-256 on Stream Vessel servers Encrypted on your server In your browser profile only In your OS keychain
Who sees them Nobody. Never shared with third parties You Nobody but you Nobody but you
Where file bytes go Browser to storage over presigned links. Our servers never hold files Browser to storage Directly to storage Directly to storage
Permissions asked Account sign-in Your sign-in storage, alarms, identity; one host at a time when you connect None
Parity

One product, four ways to run it.

Stream Vessel Cloud is the most complete today. Every feature is coming to the extension now, and to the desktop app and self-hosting next.

Feature Cloud Self-hosted Chrome extension Desktop
Two-pane explorer: folder tree and file list ✓Soon✓Soon
Several panes side by side, each on its own connection ✓Soon✓Soon
Presigned links, single and bulk, with chosen expiry ✓Soon✓Soon
Share a connection, bucket or folder with a colleague at READ / WRITE / FULL ✓Soon——
MCP server with 16 tools ✓Soon——
Google Drive: send files to a Drive folder ✓Soon✓Soon
Keys never leave your device ——✓Soon

See the full comparison →

Pricing

Free. Open source coming soon. Enterprise when you need it.

Everything on this page is free, hosted or self-hosted. Enterprise features are coming soon as a paid tier.

See pricing →
  • Enterprise · soon
  • SSO and SAML
  • SCIM provisioning
  • Org-wide admin
  • Audit export and retention
  • Self-hosting for 30 users and more
FAQ

Questions people ask.

Which way should I run it? → Where are my access keys stored? → Is Stream Vessel free? → Is it open source? →

Start with the way that fits you.

Open Stream Vessel Cloud Add to Chrome