Comparison
outlines vs langstream
Verdict
Pick outlines if critical Facts About Outlines; pick langstream if langStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability.
Markdown twin · outlines alternatives · langstream alternatives
GraphCanon updated Sep 20, 2026
16views this month
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Trust & integrity
| Signal | outlines | langstream |
|---|---|---|
| Maintenance | Very active (0d since push) As of Sep 20, 2026 · github_public_v1 | Dormant (977d since push) As of Sep 7, 2026 · github_public_v1 |
| Provenance | Not a fork · Organization account As of Sep 20, 2026 · github_public_v1 | Not a fork · Personal account As of Sep 7, 2026 · github_public_v1 |
| OSV dependency advisories | No lockfile (source not queried) As of Jul 11, 2026 · osv@v1 | No lockfile (source not queried) As of Jul 11, 2026 · osv@v1 |
| deps.dev advisories | Not queried deps.dev@v1 | Not queried deps.dev@v1 |
| OpenSSF Scorecard | Not queried openssf-scorecard@v1 | Not queried openssf-scorecard@v1 |
Tagline
- outlines
- Structured Outputs
- langstream
- Build robust LLM applications with true composability
Stars
- outlines
- 16k
- langstream
- 417
Forks
- outlines
- 882
- langstream
- 28
Open issues
- outlines
- 173
- langstream
- 3
Language
- outlines
- Python
- langstream
- Python
Adopt for
- outlines
- Critical Facts About Outlines
- langstream
- LangStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability.
Persona
- outlines
- -
- langstream
- -
Runtime
- outlines
- -
- langstream
- -
License
- outlines
- Apache-2.0
- langstream
- MIT
Last pushed
- outlines
- Sep 19, 2026
- langstream
- Jan 3, 2024
Categories
- outlines
- Developer Tools, LLM Frameworks
- langstream
- Developer Tools, LLM Frameworks
Trust and health
Maintenance
- outlines
- Very active (96%)
- langstream
- Dormant (18%)
Days since push
- outlines
- 0d
- langstream
- 977d
Open issues (now)
- outlines
- 173
- langstream
- 3
Stars delta
- outlines
- +477 (30d)
- langstream
- 0 (30d)
Open issues delta
- outlines
- +52 (30d)
- langstream
- 0 (30d)
Owner type
- outlines
- Organization
- langstream
- User
Full report
- outlines
- Trust report
- langstream
- Trust report
Shared compatibility
- Python · outlines: Python runtime · langstream: Python runtime
Choose outlines if…
- License: outlines is Apache-2.0, langstream is MIT.
- Tags unique to outlines: cfg, generative-ai, json, llms.
- When you need to generate structured outputs such as JSON objects or specific data formats from generative AI models.
When NOT to use outlines
- If your application does not require handling complex or nested structures in the output, as outlines specializes in structured generation which might be an overly complex solution for simple outputs.
- When working with non-Python environments or projects where Python dependencies are constrained due to its requirement for a Python setup.
Choose langstream if…
- License: langstream is MIT, outlines is Apache-2.0.
- Tags unique to langstream: composability, modular development, python.
- LangStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability.
When NOT to use langstream
- Last GitHub push was Jan 3, 2024 (dormant maintenance). Validate activity before betting a new project on langstream.
- Developer Tools: A gateway is overkill when you're pinned to a single provider and model.
- LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves.
Explore
Sources
Every stat on this page traces to a dated GitHub sync, license file, enrichment field, or trust scan.
- GitHub stars (dottxt-ai/outlines) · observed Sep 20, 2026
- GitHub forks (dottxt-ai/outlines) · observed Sep 20, 2026
- Last push (dottxt-ai/outlines) · observed Sep 19, 2026
- License file (Apache-2.0) · observed Sep 20, 2026
- Decision facts (enrichment) · observed Jul 11, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
- GitHub stars (rogeriochaves/langstream) · observed Sep 20, 2026
- GitHub forks (rogeriochaves/langstream) · observed Sep 20, 2026
- Last push (rogeriochaves/langstream) · observed Jan 3, 2024
- License file (MIT) · observed Sep 20, 2026
- Decision facts (enrichment) · observed Jul 12, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
GitHub stars on cards: outlines 16k · langstream 417 (synced Sep 20, 2026).
Common questions
- What is the difference between outlines and langstream?
- outlines: Structured Outputs. langstream: Build robust LLM applications with true composability. See the comparison table for live GitHub stats and shared categories.
- When should I choose outlines over langstream?
- Choose outlines over langstream when License: outlines is Apache-2.0, langstream is MIT; Tags unique to outlines: cfg, generative-ai, json, llms; When you need to generate structured outputs such as JSON objects or specific data formats from generative AI models.
- When should I choose langstream over outlines?
- Choose langstream over outlines when License: langstream is MIT, outlines is Apache-2.0; Tags unique to langstream: composability, modular development, python; LangStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability.
- When should I avoid outlines?
- If your application does not require handling complex or nested structures in the output, as outlines specializes in structured generation which might be an overly complex solution for simple outputs. When working with non-Python environments or projects where Python dependencies are constrained due to its requirement for a Python setup.
- When should I avoid langstream?
- Last GitHub push was Jan 3, 2024 (dormant maintenance). Validate activity before betting a new project on langstream. Developer Tools: A gateway is overkill when you're pinned to a single provider and model. LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves.
- Is outlines or langstream more popular on GitHub?
- outlines has more GitHub stars (15,841 vs 417). Stars measure visibility, not whether either tool fits your constraints.
- Are outlines and langstream open source?
- Yes - both are open-source projects on GitHub (outlines: Apache-2.0, langstream: MIT).
- Where can I find alternatives to outlines or langstream?
- GraphCanon lists graph-backed alternatives at outlines alternatives and langstream alternatives (outlines markdown twin, langstream 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, outlines or langstream?
- outlines: Very active. langstream: Dormant. 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 outlines and langstream?
- GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: outlines trust report; langstream trust report.