SlackVault and Mattermost: Stay on Slack or Host Your Own Chat

SlackVault and MattermostA self-hosted team chat some teams move to so their history lives on their own servers.Last checked November 7, 2026. Check Mattermost for yourselfSlackVault is not affiliated with or endorsed by Slack.Which one suits youChoose Mattermost if you are ready to leave Slack and run the chat yourself on your own servers, with retention and compliance export under your control.Choose SlackVault if your team wants to keep using Slack as it is and only needs its messages copied into your own Firebase project, without migrating anyone.What each one costs

SlackVault: Forever Free

Entry

$0 / month

a free limited-use edition of Enterprise Advanced for technical evaluation

Their page

Professional

No listed price

Quote only: the page lists plans and limits (up to 250 users) without a readable price

Their page

Enterprise

No listed price

Quote only (Contact sales)

Their page

Side by side

Saves public channel messages

Yes

Not stated on the pages we checked

Saves private channel messages

Yes

Not stated on the pages we checked

Saves direct messages and group DMs

Yes

Not stated on the pages we checked

Saves thread replies

Yes: A thread that fails to save is skipped, not retried

Not stated on the pages we checked

Saves shared files

Yes: File details always; copies only at a public link on our storage, when switched on

Not stated on the pages we checked

Runs on its own on a schedule

Yes: Every 15 minutes, while the browser runs

Not stated on the pages we checked

Copy lives in storage you control

Partly: Messages in your Firebase project; file copies are not in your storage

Yes: self-hosted: your data stays on your infrastructure Their page

Search across the saved history

Yes: The most recent page of messages, up to 50 per query

Yes: core search up to 3 million posts; Elasticsearch beyond Their page

Export to open file formats

Yes: JSON, CSV, HTML and Markdown

Partly: compliance export and channel export listed under Enterprise Their page

Works without workspace admin rights

Partly: No admin scopes, though a workspace can require approval for new apps

Not stated on the pages we checked

Puts records back into Slack

No: No way yet to send records back into Slack

Not stated on the pages we checked

Free plan with no time limit

Yes

Partly: Entry is free and limited-use, for evaluation Their page

What SlackVault does today, and what it does not

Messages, channels, members and file records go to your own Firebase project. Supabase is not supported yet.

Files do not go to your Google Drive or your Firebase project. When file copying is switched on in our extension build, each file uploads to our file storage with its visibility set to public: the link is hard to guess, but anyone holding it can open the file without signing in. Where no storage key is set in the build, no copy is made, and your archive keeps the file’s details and Slack’s link, which works only while Slack serves that file.

There is no way yet to send records back into Slack.

The sync runs in a browser extension, every 15 minutes, only while that browser is running.

SlackVault can copy only what Slack’s API still returns, so anything older than your plan’s window is out of reach unless an earlier sync already saved it.

If saving one thread fails, the sync logs it and moves on without retrying those replies.

Search checks the most recent page of messages, up to 50 per query, not the whole archive.

The extension and the Android app have no store listing yet, and the source code is in a private repository.

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