Comparison
PiSSA vs open-webui
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.
Markdown twin · PiSSA alternatives · open-webui alternatives
GraphCanon updated today
vs
Trust & integrity
| Signal | PiSSA | open-webui |
|---|---|---|
| Maintenance | Dormant (376d since push) As of today · github_public_v1 | Very active (0d since push) As of today · github_public_v1 |
| Provenance | Not a fork · Organization account As of today · github_public_v1 | Not a fork · Organization account As of today · github_public_v1 |
| Security (OSV) | No lockfile As of today · none | No MCP manifest As of today · mcp_manifest |
Tagline
- 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, ...)
Stars
- PiSSA
- 429
- open-webui
- 145k
Forks
- PiSSA
- 22
- open-webui
- 21k
Open issues
- PiSSA
- 16
- open-webui
- 391
Language
- PiSSA
- Jupyter Notebook
- open-webui
- Python
Adopt for
- PiSSA
- -
- open-webui
- Suitable for developers working with large language models who require a user-friendly interface and support for multiple APIs including Ollama and OpenAI.
Persona
- PiSSA
- -
- open-webui
- -
Runtime
- PiSSA
- -
- open-webui
- -
License
- PiSSA
- -
- open-webui
- Other
Last pushed
- PiSSA
- Jun 30, 2025
- open-webui
- Jul 10, 2026
Categories
- PiSSA
- Inference & Serving, LLM Frameworks, Vector Databases
- open-webui
- Inference & Serving, LLM Frameworks
Trust and health
Maintenance
- PiSSA
- Dormant (18%)
- open-webui
- Very active (96%)
Days since push
- PiSSA
- 376d
- open-webui
- 0d
Open issues (now)
- PiSSA
- 16
- open-webui
- 391
Security scan
- PiSSA
- No lockfile
- open-webui
- No MCP manifest
Full report
- PiSSA
- Trust report
- open-webui
- Trust report
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.
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.
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 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.
Explore
Sources
Every stat on this page traces to a dated GitHub sync, license file, enrichment field, or trust scan.
- GitHub stars (MuLabPKU/PiSSA) · observed Jul 11, 2026
- GitHub forks (MuLabPKU/PiSSA) · observed Jul 11, 2026
- Last push (MuLabPKU/PiSSA) · observed Jun 30, 2025
- License file (unknown) · observed Jul 11, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
- GitHub stars (open-webui/open-webui) · observed Jul 11, 2026
- GitHub forks (open-webui/open-webui) · observed Jul 11, 2026
- Last push (open-webui/open-webui) · observed Jul 10, 2026
- License file (Other) · observed Jul 11, 2026
- Decision facts (enrichment) · observed Jul 11, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
GitHub stars on cards: PiSSA 429 · open-webui 145k (synced Jul 11, 2026).
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 and open-webui alternatives (PiSSA markdown twin, open-webui markdown twin), 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 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; open-webui trust report.