--- title: "PiSSA vs open-webui" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/mulabpku-pissa-vs-open-webui-open-webui" tools: ["mulabpku-pissa", "open-webui-open-webui"] --- # PiSSA vs open-webui *GraphCanon updated Jul 11, 2026* ## Verdict Pick PiSSA when piSSA is primarily Jupyter Notebook; open-webui is Python; pick open-webui when open-webui is primarily Python; PiSSA is Jupyter Notebook. [PiSSA](https://proceedings.neurips.cc/paper_files/paper/2024/file/db36f4d603cc9e3a2a5e10b93e6428f2-Paper-Conference.pdf) reports 429 GitHub stars, 22 forks, and 16 open issues, last pushed Jun 30, 2025. [open-webui](https://openwebui.com) has 145k stars, 21k forks, and 391 open issues, last pushed Jul 10, 2026. Figures are from public GitHub metadata via [PiSSA's repository](https://github.com/MuLabPKU/PiSSA) and [open-webui's repository](https://github.com/open-webui/open-webui). | | [PiSSA](/tools/mulabpku-pissa.md) | [open-webui](/tools/open-webui-open-webui.md) | | --- | --- | --- | | Tagline | PiSSA: Principal Singular Values and Singular Vectors Adaptation of Large Language Models(NeurIPS 2024 Spotlight) | User-friendly AI Interface (Supports Ollama, OpenAI API, ...) | | Stars | 429 | 145,029 | | Forks | 22 | 21,005 | | Open issues | 16 | 391 | | Language | Jupyter Notebook | Python | | Adopt for | - | Suitable for developers working with large language models who require a user-friendly interface and support for multiple APIs including Ollama and OpenAI. | | Persona | - | - | | Runtime | - | - | | License | - | Other | | Categories | Inference & Serving, LLM Frameworks, Vector Databases | Inference & Serving, LLM Frameworks | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [PiSSA](/tools/mulabpku-pissa.md) | [open-webui](/tools/open-webui-open-webui.md) | | --- | --- | --- | | Maintenance | Dormant (18%) | Very active (96%) | | Days since push | 376d | 0d | | Open issues (now) | 16 | 391 | | Security scan | No lockfile | No MCP manifest | | Full report | [trust report](/tools/mulabpku-pissa/trust.md) | [trust report](/tools/open-webui-open-webui/trust.md) | ## Decision facts: open-webui - **Adopt for:** Suitable for developers working with large language models who require a user-friendly interface and support for multiple APIs including Ollama and OpenAI. ## Choose when ### Choose PiSSA if… - PiSSA is primarily Jupyter Notebook; open-webui is Python. - Tags unique to PiSSA: fine-tuning, jupyter notebook, peft, quantization. - Also covers Vector Databases. ### Choose open-webui if… - open-webui is primarily Python; PiSSA is Jupyter Notebook. - Tags unique to open-webui: ai, llm, openai, self-hosted. - When you need to integrate multiple AI services, such as Ollama and OpenAI, into a unified user interface. ## When NOT to use PiSSA - Last GitHub push was 377 days ago (dormant maintenance, Jun 30, 2025). Validate activity before betting a new project on PiSSA. - Inference & Serving: Self-hosting rarely beats a hosted API on cost until you have steady, high-volume traffic. - LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves. - Vector Databases: Don't reach for a dedicated vector DB under ~100k vectors; pgvector on your existing Postgres is simpler to operate. ## When NOT to use open-webui - When looking for tooling that exclusively supports APIs other than Ollama and OpenAI, as these are specific areas of focus for open-webui. - If the requirement is a highly specialized interface tailored to specific tasks rather than a general AI interaction platform. ## Common questions ### What is the difference between PiSSA and open-webui? PiSSA: PiSSA: Principal Singular Values and Singular Vectors Adaptation of Large Language Models(NeurIPS 2024 Spotlight). open-webui: User-friendly AI Interface (Supports Ollama, OpenAI API, ...). See the comparison table for live GitHub stats and shared categories. ### When should I choose PiSSA over open-webui? Choose PiSSA over open-webui when PiSSA is primarily Jupyter Notebook; open-webui is Python; Tags unique to PiSSA: fine-tuning, jupyter notebook, peft, quantization; Also covers Vector Databases. ### When should I choose open-webui over PiSSA? Choose open-webui over PiSSA when open-webui is primarily Python; PiSSA is Jupyter Notebook; Tags unique to open-webui: ai, llm, openai, self-hosted; When you need to integrate multiple AI services, such as Ollama and OpenAI, into a unified user interface. ### When should I avoid PiSSA? Last GitHub push was 377 days ago (dormant maintenance, Jun 30, 2025). Validate activity before betting a new project on PiSSA. Inference & Serving: Self-hosting rarely beats a hosted API on cost until you have steady, high-volume traffic. LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves. Vector Databases: Don't reach for a dedicated vector DB under ~100k vectors; pgvector on your existing Postgres is simpler to operate. ### When should I avoid open-webui? When looking for tooling that exclusively supports APIs other than Ollama and OpenAI, as these are specific areas of focus for open-webui. If the requirement is a highly specialized interface tailored to specific tasks rather than a general AI interaction platform. ### Is PiSSA or open-webui more popular on GitHub? open-webui has more GitHub stars (145,029 vs 429). Stars measure visibility, not whether either tool fits your constraints. ### Are PiSSA and open-webui open source? Yes - both are open-source projects on GitHub. ### Where can I find alternatives to PiSSA or open-webui? GraphCanon lists graph-backed alternatives at [PiSSA alternatives](/tools/mulabpku-pissa/alternatives) and [open-webui alternatives](/tools/open-webui-open-webui/alternatives) ([PiSSA markdown twin](/tools/mulabpku-pissa/alternatives.md), [open-webui markdown twin](/tools/open-webui-open-webui/alternatives.md)), ranked by typed relationship edges rather than popularity votes. ### Is there a machine-readable version of this comparison? Yes. The markdown twin at [this comparison](/compare/mulabpku-pissa-vs-open-webui-open-webui.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, PiSSA or open-webui? PiSSA: Dormant. open-webui: Very active. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance. ### Where are the full trust reports for PiSSA and open-webui? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [PiSSA trust report](/tools/mulabpku-pissa/trust); [open-webui trust report](/tools/open-webui-open-webui/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=mulabpku-pissa`](/api/graphcanon/graph?tool=mulabpku-pissa) - LLM index: [/llms.txt](/llms.txt) - Full corpus: [/llms-full.txt](/llms-full.txt) _GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_