Comparison
prompttools vs langstream
Verdict
Pick prompttools if prompttools is an open-source suite for prompt testing and experimentation, supporting both LLMs and vector databases, making it a versatile choice for developers and researchers working with AI models and data retrieval; pick langstream if langStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability.
Markdown twin · prompttools alternatives · langstream alternatives
GraphCanon updated Sep 20, 2026
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Trust & integrity
| Signal | prompttools | langstream |
|---|---|---|
| Maintenance | Slowing (219d since push) As of Sep 18, 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 18, 2026 · github_public_v1 | Not a fork · Personal account As of Sep 7, 2026 · github_public_v1 |
| OSV dependency advisories | Published findings As of Sep 18, 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
- prompttools
- Open-source tools for prompt testing and experimentation
- langstream
- Build robust LLM applications with true composability
Stars
- prompttools
- 3.1k
- langstream
- 417
Forks
- prompttools
- 256
- langstream
- 28
Open issues
- prompttools
- 43
- langstream
- 3
Language
- prompttools
- Python
- langstream
- Python
Adopt for
- prompttools
- Prompttools is an open-source suite for prompt testing and experimentation, supporting both LLMs and vector databases, making it a versatile choice for developers and researchers working with AI models and data retrieval
- langstream
- LangStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability.
Persona
- prompttools
- -
- langstream
- -
Runtime
- prompttools
- -
- langstream
- -
License
- prompttools
- Prompttools is distributed under the Apache-2.0 license, allowing for broad use in both commercial and open-source projects
- langstream
- MIT
Last pushed
- prompttools
- Feb 11, 2026
- langstream
- Jan 3, 2024
Categories
- prompttools
- Developer Tools, LLM Frameworks, Vector Databases
- langstream
- Developer Tools, LLM Frameworks
Trust and health
Maintenance
- prompttools
- Slowing (36%)
- langstream
- Dormant (18%)
Days since push
- prompttools
- 219d
- langstream
- 977d
Open issues (now)
- prompttools
- 43
- langstream
- 3
Stars delta
- prompttools
- +9 (30d)
- langstream
- 0 (30d)
Open issues delta
- prompttools
- +2 (30d)
- langstream
- 0 (30d)
Owner type
- prompttools
- Organization
- langstream
- User
OSV dependency advisories
- prompttools
- Published findings
- langstream
- No lockfile (source not queried)
Full report
- prompttools
- Trust report
- langstream
- Trust report
Choose prompttools if…
- License: prompttools is Apache-2.0, langstream is MIT.
- Requirements: Min 4 GB RAM; Python environment is required for using Prompttools.
- Tags unique to prompttools: deep-learning, embeddings, large-language-models, llms.
- Also covers Vector Databases.
- When you need to test and experiment with prompts for LLMs such as OpenAI and LLaMA, and vector databases like Chroma, Weaviate, and LanceDB
When NOT to use prompttools
- If your project is strictly focused on a single AI framework that does not require prompt testing or experimentation with vector databases
- When you are working in an environment where the Apache-2.0 license is not compatible with your project's licensing requirements
Choose langstream if…
- License: langstream is MIT, prompttools is Apache-2.0.
- Tags unique to langstream: composability, modular development.
- 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 (hegelai/prompttools) · observed Sep 20, 2026
- GitHub forks (hegelai/prompttools) · observed Sep 20, 2026
- Last push (hegelai/prompttools) · observed Feb 11, 2026
- License file (Apache-2.0) · observed Sep 20, 2026
- Decision facts (enrichment) · observed Sep 18, 2026
- Trust scan (lockfile / OSV) · observed Sep 18, 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: prompttools 3.1k · langstream 417 (synced Sep 20, 2026).
Common questions
- What is the difference between prompttools and langstream?
- prompttools: Open-source tools for prompt testing and experimentation. langstream: Build robust LLM applications with true composability. See the comparison table for live GitHub stats and shared categories.
- When should I choose prompttools over langstream?
- Choose prompttools over langstream when License: prompttools is Apache-2.0, langstream is MIT; Requirements: Min 4 GB RAM; Python environment is required for using Prompttools; Tags unique to prompttools: deep-learning, embeddings, large-language-models, llms; Also covers Vector Databases; When you need to test and experiment with prompts for LLMs such as OpenAI and LLaMA, and vector databases like Chroma, Weaviate, and LanceDB.
- When should I choose langstream over prompttools?
- Choose langstream over prompttools when License: langstream is MIT, prompttools is Apache-2.0; Tags unique to langstream: composability, modular development; LangStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability.
- When should I avoid prompttools?
- If your project is strictly focused on a single AI framework that does not require prompt testing or experimentation with vector databases When you are working in an environment where the Apache-2.0 license is not compatible with your project's licensing requirements
- 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 prompttools or langstream more popular on GitHub?
- prompttools has more GitHub stars (3,055 vs 417). Stars measure visibility, not whether either tool fits your constraints.
- Are prompttools and langstream open source?
- Yes - both are open-source projects on GitHub (prompttools: Apache-2.0, langstream: MIT).
- Where can I find alternatives to prompttools or langstream?
- GraphCanon lists graph-backed alternatives at prompttools alternatives and langstream alternatives (prompttools 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, prompttools or langstream?
- prompttools: Slowing. 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 prompttools and langstream?
- GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: prompttools trust report; langstream trust report.