mountOS vs Flatstack

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

mountOS compared with Flatstack
Detail	mountOS	Flatstack
What it does	Self-hosted POSIX filesystem that mounts S3 and object storage on Mac, Windows, Linux, and Kubernetes	One flat price for your app's backend
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	GB
Pricing model	Freemium	Paid
Pricing	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.	Hobby £9 a month (1 project, 1M requests, 1 GB database, 5 GB files, 3,000 emails, 1 person). Pro £19 a month (3 projects, 5M requests, 5 GB database with Postgres on 1 project, 25 GB files, 15,000 emails, 3 people). Studio £49 a month (10 projects, 25M requests, 20 GB database with Postgres on 3 pr
Key features	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	SQLite or Postgres database Passkeys, magic links and social sign-in File uploads and image resizing Email sending from custom domain TypeScript server functions Background jobs and scheduled tasks Hosting for Next.js, Astro and React Router Preview deployments per pull request Project parking without pausing MCP integration for AI agents
What makes it different	Built-in version history and time travel, no backup scheduling needed True POSIX compatibility verified with industry test suites Copy-free volume forks for isolated experimentation Elastic capacity that grows with data Data stays on customer-owned infrastructure	One flat price with no usage billing across all services Combines database, auth, files, email and hosting in one service Import apps from Lovable, Supabase or Clerk in an afternoon Security defaults prevent database keys reaching browser MCP support lets AI agents run deployments
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	18 +1 (up) since last check	Not checked yet no change since last check
Trust Flow (Majestic)	0	0
Citation Flow (Majestic)	16	0
Referring domains (Majestic)	3	0

5 details filled in for both companies.

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