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mountOS

Self-hosted POSIX filesystem that mounts S3 and object storage on Mac, Windows, Linux, and Kubernetes

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Mount object storage as a POSIX-compliant filesystem with native access on Mac, Windows, Linux, and Kubernetes, featuring forks, time travel, and version

Overview

The mountOS homepage

mountOS is a self-hosted distributed filesystem that mounts S3 and object storage as a native POSIX-compliant filesystem on Mac, Windows, Linux, and Kubernetes. Users can access data through native mounts, S3, WebHDFS, or Kubernetes CSI interfaces. The system includes built-in version history with configurable granularity (one minute by default), time travel to access earlier points in time, and volume forks for isolated experimentation. Data remains on customer-owned infrastructure and object storage. The free tier supports up to 10 TiB with all capabilities included.

Capabilities

POSIX-compliant filesystem interface
Native mounting on Mac, Windows, Linux, and Kubernetes
Time travel to access volumes at earlier points in time
Automatic version history with configurable granularity
Recently-deleted file recovery
S3 and WebHDFS API compatibility
Kubernetes CSI driver support
MCP connector for AI agents
Apache Iceberg catalog support for analytical workloads

Pricing

Pricing model: Freemium

Free up to 10 TiB for a single self-hosted deployment with every capability included. Beyond that, a Business License is arranged directly with the company.

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mountOS fact sheet

Community votes	0
Website	mountos.io

mountOS metrics

Vendor metrics for mountos.io: Ahrefs Domain Rating and Majestic link data, with the delta since the last review.

Domain Rating: 18; +1 (up) since last check
Trust Flow: 0; no change since last check
Citation Flow: 16; no change since last check
Referring domains: 3; no change since last check
External backlinks: 5; no change since last check

Vendor Domain Rating (Ahrefs) checked 6 Nov 2026, spec changed 1 Nov 2026. Vendor Majestic data checked 27 Oct 2026, spec changed 27 Oct 2026. Link metrics supplied by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

mountOS vendor domain

Open the vendor record

We read this from the registry's RDAP record on 6 Nov 2026, 02:44 UTC.

Domain age: 7 months
Registered: 6 Apr 2026
Expires: 6 Apr 2029
Registrar: Cloudflare, Inc
DNSSEC: Signed

Vendor domain report: mountos.io

mountOS post-launch report

Measured after mountOS went live on SaaS Directory Pro on 27 October 2026.
Measure	At launch, then latest
Domain Rating (Ahrefs)	16 to 18 +2 (up) since launch 27 Oct 2026, then 5 Nov 2026
Trust Flow (Majestic)	0 first measured 27 Oct 2026
Referring domains (Majestic)	3 first measured 27 Oct 2026

Day 10 since launch. Next receipt: day 30, 26 Nov 2026. Many things move these figures, so a change is not proof of cause. Only stored readings are shown.

Biggest gains on SaaS Directory Pro

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Buyer questions

How can object storage be mounted as a POSIX filesystem?

mountOS mounts object storage as a native, POSIX-compliant filesystem on Mac, Windows, Linux, and Kubernetes, and serves S3 and WebHDFS APIs from the same volume. Applications read and write files as they are written, and the data lands in owned object storage.

Where does my data live?

Data lives on owned infrastructure: owned servers and owned object storage.

Do I have to schedule backups or snapshots?

No. Version history at a configurable granularity (one minute by default, down to a sub-minute window), time travel, and recently-deleted recovery are built into the storage. Open any version or deleted file and copy it out.

Can AI agents work with it?

Yes. Each client ships a read-only MCP connector, alongside a drop-in agent skill and llms.txt for any MCP-capable client.

How is POSIX compatibility verified?

With the industry filesystem suites, each covering a different surface: pjdfstest for POSIX compliance (8,789 tests), the Linux Test Project (LTP) for filesystem and system-call behavior, xfstests for filesystem regressions, fsx for I/O consistency under randomized operations, and IOR with mdtest for I/O throughput and metadata load.

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