Head-to-Head Comparison · Alternative to Grok · 👥 community
Grok vs Fullmoon
A mobile app for interacting with private, local large language models that work offline and are optimized for Apple silicon. Here is how Fullmoon ($0/mo open source) stacks up against Grok ($15/mo) across cost, hosting, data privacy, and real-world trade-offs.
Fullmoon is a verified Open Source-licensed open-source replacement for Grok. Switching from Grok ($15/mo) saves $180/yr per solo seat, or $900/yr for a 5-person team. Deployment: Runs on Local.
The catch: Community-driven open source project without dedicated enterprise SLAs.
Fullmoon
$0.00/mo · Open Source
Grok vs Fullmoon Specifications
facts verified 2026-11-07
| Dimension | Grok (Paid) | Fullmoon (Replacement) |
|---|---|---|
| Monthly Price | $15 / mo | $0 / mo |
| 1-Year Cost (1 seat) | $180 / yr | $0 / yr (Save $180) |
| 1-Year Cost (5 seats) | $900 / yr | $0 / yr (Save $900) |
| 1-Year Cost (10 seats) | $1,800 / yr | $0 / yr (Save $1,800) |
| Source & License | Proprietary SaaS | open source Open Source |
| Where It Runs | Vendor Cloud | Local (on your machine) |
| Platforms | Web / Cloud | desktopcross-platformone-click install |
| GitHub Stars | — | ★ 2.3k (active nov 2026) |
Deep Dive: Switching from Grok to Fullmoon
Trade-offs, installation & data architecture
What you trade away
Community-driven open source project without dedicated enterprise SLAs.
How to deploy Fullmoon
Clone https://github.com/mainframecomputer/fullmoon-ios or deploy with Docker Compose
What it takes to run
Download the native package or installer for your operating system.
Where your data lives
All application data lives locally on your own machine.
Why fork Fullmoon instead of vibe-coding a Grok clone?
Instead of paying recurring SaaS fees for Grok or rebuilding it from scratch, deploy one of the 6 battle-tested open-source alternatives like Proton Lumo.
Grok vs Fullmoon FAQ
Is Fullmoon a good free alternative to Grok?+
Yes. Fullmoon is a verified open-source (Open Source) replacement for Grok. A mobile app for interacting with private, local large language models that work offline and are optimized for Apple silicon.
What is the catch when switching from Grok to Fullmoon?+
Community-driven open source project without dedicated enterprise SLAs.
How much do you save switching from Grok to Fullmoon?+
Grok costs $15/mo ($180/yr) per seat, whereas Fullmoon is $0/mo. Switching saves $180/yr for a solo user, $900/yr for a 5-person team, and $1,800/yr for a 10-person team.
How do I install or self-host Fullmoon instead of Grok?+
Install: Clone https://github.com/mainframecomputer/fullmoon-ios or deploy with Docker Compose. Setup: Download the native package or installer for your operating system.
