Ollama
Ollama runs in the background for other apps to use. It works offline with zero data leaks. Great integration docs make it ideal for developers. However, it relies on a command-line interface, and document chat requires extra tools.
Local & open source · 5 tools compared
5 Best Local LLM Runners Compared
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Prices may changeIn a hurry? Pick this
🌱
Best for Beginners
LM Studio ✓Free
Search and download models to chat immediately. No terminal needed.
🔒
Best for Sensitive Docs
GPT4All ✓Free
Answers questions from local folders. Your confidential files never leave your PC.
⚡
Best for Quick Testing
WebLLM Chat ✓Free
Runs in your browser via URL. Uses small models, so Korean is awkward.
💼
Best for App Integration
Ollama ✓Free
Widely used as a backend for other tools, making integration guides easy to find.
Comparison table
| Item | Ollama | LM Studio | Jan | GPT4All | WebLLM Chat |
|---|---|---|---|---|---|
| Price | Free | ✓Free | ✓Free | ✓Free | ✓Free |
| Korean | △PartialThe interface is in English. Korean language capability depends on the downloaded model. | △PartialThe interface is in English. Korean language capability depends on the downloaded model. | △PartialThe interface is in English. Korean proficiency depends on which model you download. | △PartialThe interface is in English. Korean language capability depends on which model you download. | △PartialThe interface is in English. Because it runs lightweight models in the browser, Korean language output can be awkward. |
| Login | Not needed | Not needed | Not needed | Not needed | Not needed |
| Platforms | Windows · macOS · Linux · API | Windows · macOS · Linux | Windows · macOS · Linux | Windows · macOS · Linux | Web |
| File input | None | PDF, TXT | None | PDF, DOCX, TXT | None |
| Commercial use | ConditionalUsage terms vary by downloaded model. You must check each model's individual license. | ConditionalCheck terms for business use. Individual model licenses must also be reviewed separately. | ConditionalThe app is under an open-source license. You must check the terms for each downloaded model separately. | ConditionalUsage terms vary depending on the downloaded model. You must check each model's specific license. | ConditionalYou must check the license terms for each specific model you download. |
| Installation | Required | Required | Required | Required | None, runs in browser |
| Chat with Docs | Not directly supported | Supported | Limited | Search via folder selection | Not supported |
| Best For | Backend for app integration | Testing and comparing models | Open-source requirements | Confidential local documents | Quick trial without installation |
Values come straight from each tool page. Click a name for details. Swap tools and compare again →
Tool by tool
LM Studio
The easiest way to start. Search and download models by size to chat right away. Great for comparing Korean performance across models and uploading docs. The English UI and deep settings can be tricky, and commercial use requires license checks.
Jan
An open-source tool ideal for teams requiring code transparency. Easily switch between local and cloud models in one UI. Downloading models is less intuitive than LM Studio, and limited Korean resources make troubleshooting harder.
GPT4All
Built for local documents. Select a folder to index and query sensitive files safely offline. Large folders slow down responses, and smaller models may misread Korean text, requiring fact-checking against the original document.
WebLLM Chat
Runs directly in your browser with zero installation. Ideal for testing on restricted work PCs. Because it uses tiny models, Korean responses are awkward and factually prone to errors. Initial model downloads also take time.
How to choose
First, define your main goal. Choose GPT4All for local doc search, LM Studio to test models, or Ollama for app integration. WebLLM Chat is best for restricted PCs, while Jan fits open-source needs. PC memory and model choice matter most: start with smaller models if you have under 16GB RAM. While all five are foreign tools, you can run Korean open models like EXAONE or HyperCLOVA X SEED. Check licenses before commercial use.
Recommendation by situation
| Situation | Pick | Why |
|---|---|---|
| 🌱 Best for Beginners | LM Studio | Search and download models to chat immediately. No terminal needed. |
| 🔒 Best for Sensitive Docs | GPT4All | Answers questions from local folders. Your confidential files never leave your PC. |
| ⚡ Best for Quick Testing | WebLLM Chat | Runs in your browser via URL. Uses small models, so Korean is awkward. |
| 💼 Best for App Integration | Ollama | Widely used as a backend for other tools, making integration guides easy to find. |
Not a ranking. Different situations, different answers.
Last verified:
Prices may change; confirm on each official site before paying. A comparison's verified date is the oldest of the comparison and its tools.
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