Grok costs $15/mo.
These cost $0.
6 free alternatives to Grok, checked for license, recent activity and real adoption. Each one tells you the catch, so you can switch with your eyes open.
The top-rated free, open-source replacement for Grok is Proton Lumo (Open Source Open Source). Across this category, 3 self-hostable tools are available (including Open WebUI and LibreChat). Switching a 5-person team saves up to $900/year compared to Grok's $15/mo subscription.
The catch: Community-driven open source project without dedicated enterprise SLAs.
Grok vs Free Alternatives
Quick side-by-side comparison · $0/mo vs $15/mo
| Alternative | Type | License | Where It Runs | Stars | Head-to-Head |
|---|---|---|---|---|---|
| Proton Lumo | open source | Open Source | Local | ★ 5.7k | Grok vs Proton Lumo → |
| Open WebUI | free | Open WebUI | Self-host | ★ 158k | Grok vs Open WebUI → |
| LibreChat | open source | MIT | Self-host | ★ 46.8k | Grok vs LibreChat → |
| Jan | open source | Apache-2.0 | Self-host | ★ 45.5k | Grok vs Jan → |
| Fullmoon | open source | Open Source | Local | ★ 2.3k | Grok vs Fullmoon → |
| Zola | open source | Open Source | Local | ★ 1.5k | Grok vs Zola → |
The picks
5 open source · 1 free to use · ranked by fit
- 01
Proton Lumo
open sourceOpen SourceLocal5.7knov 2026AI chat assistant from Proton that stores conversations with zero-access encryption, never logs chats, and never uses your data to train models.
The catch vs GrokCommunity-driven open source project without dedicated enterprise SLAs.
Install, platforms & data +
- platforms
- desktopcross-platformone-click install
- install
- Clone https://github.com/ProtonMail/WebClients/tree/main/applications/lumo or deploy with Docker Compose
- setup
- Download the native package or installer for your operating system.
- your data
- All application data lives locally on your own machine.
- checked
- 2026-11-07
- 02
Open WebUI
freeOpen WebUISelf-host158knov 2026Self-hosted AI platform that connects local and cloud models, extends with Python, and keeps your data under your control.
The catch vs GrokParallel chats work, but the self-hosted interface is less focused on clean side-by-side evaluation and still leaves provider setup and billing to you.
Install, platforms & data +
- platforms
- desktopwebself-hostedone-click install
- install
- Run the official Docker image, install the Python package, or deploy with Kubernetes
- setup
- A non-expert must install Docker or a compatible Python environment, mount persistent storage correctly, and separately provide Ollama or an API endpoint
- engines
- Ollama and any OpenAI-compatible API, including LM Studio, vLLM, Groq, Mistral and OpenRouter; additional speech, image and search providers
- your data
- By default, chats and account data live in a local SQLite webui.db, uploads in a data/uploads directory and embeddings in the configured vector store; PostgreSQL and object storage are optional
- checked
- 2026-11-07
- 03
LibreChat
open sourceMITSelf-host46.8knov 2026Chat with multiple AI providers through a single self-hostable interface, with support for custom agents, file uploads, plugins, and multi-user access control.
The catch vs GrokIt requires a server stack and lacks BoltAI's native macOS shortcuts and polished one-person desktop workflows.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- Clone the repository and start the recommended Docker Compose stack
- setup
- Docker Compose brings several services, and the default MongoDB image does not run on Apple Silicon without changing the setup
- engines
- OpenAI, Anthropic, Google Gemini/Vertex AI, Azure OpenAI, AWS Bedrock, Mistral, Groq, OpenRouter, DeepSeek and custom OpenAI-compatible endpoints, plus agents and MCP
- your data
- Conversations, users and configuration live in MongoDB; search indexes use Meilisearch, uploaded/RAG content uses bundled storage and a vector database; prompts sent to cloud models leave the host
- checked
- 2026-11-07
- 04
Jan
open sourceApache-2.0Self-host45.5knov 2026Jan runs open-source AI models on your own hardware or connects to cloud providers like OpenAI, Anthropic, and Google, keeping your conversations off third-party servers.
The catch vs GrokIt can follow a saved brand prompt, but it lacks Anyword's structured campaign templates, audience controls, and predictive copy scores.
Install, platforms & data +
- platforms
- desktopone-click install
- install
- Download the macOS, Windows or Linux desktop installer
- setup
- Local use requires downloading a multi-gigabyte model and enough RAM; cloud use requires an API key
- engines
- Built-in local inference via llama.cpp/llama-server plus OpenAI-compatible APIs and connectors such as OpenAI, Anthropic, Gemini, Groq, Mistral and OpenRouter
- your data
- Threads, assistants, settings and downloaded model files live in Jan's local data folder; only requests sent to configured cloud providers leave the machine
- checked
- 2026-11-07
- 05
Fullmoon
open sourceOpen SourceLocal2.3knov 2026A mobile app for interacting with private, local large language models that work offline and are optimized for Apple silicon.
The catch vs GrokCommunity-driven open source project without dedicated enterprise SLAs.
Install, platforms & data +
- platforms
- desktopcross-platformone-click install
- install
- Clone https://github.com/mainframecomputer/fullmoon-ios or deploy with Docker Compose
- setup
- Download the native package or installer for your operating system.
- your data
- All application data lives locally on your own machine.
- checked
- 2026-11-07
- 06
Zola
open sourceOpen SourceLocal1.5knov 2026Open-source chat application that lets you interact with multiple AI models in one interface, offering flexible conversations and diverse capabilities.
The catch vs GrokCommunity-driven open source project without dedicated enterprise SLAs.
Install, platforms & data +
- platforms
- desktopcross-platformone-click install
- install
- Clone https://github.com/ibelick/zola or deploy with Docker Compose
- setup
- Download the native package or installer for your operating system.
- your data
- All application data lives locally on your own machine.
- checked
- 2026-11-07
Grok Head-to-Head Comparisons (2027)
Side-by-side trade-off breakdowns · 6 free alternatives
Frequently Asked Questions
Direct answers · Grok open-source replacements
What is the best free alternative to Grok?+
The top free alternative to Grok is Proton Lumo (open source, Open Source). AI chat assistant from Proton that stores conversations with zero-access encryption, never logs chats, and never uses your data to train models. Other popular Grok replacements include Open WebUI, LibreChat, Jan.
Can I self-host a free replacement for Grok?+
Yes. Of the 6 free alternatives to Grok, 3 can be self-hosted on your own server or local machine: Open WebUI (Open WebUI), LibreChat (MIT), Jan (Apache-2.0).
How much does switching from Grok to a free alternative save?+
Grok starts at $15/month per seat ($180/year). Switching a 5-person team to a free alternative like Proton Lumo saves $900 per year in software subscription fees.
Should I vibe-code or build my own Grok clone from scratch?+
Our build verdict for Grok is NO (use a free alternative, save the tokens). 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.
What is the catch when switching from Grok to Proton Lumo?+
Community-driven open source project without dedicated enterprise SLAs.
