Comparison
prompttools vs langstream
Verdict
Pick prompttools if prompttools aims to support developers in the testing and experimentation of prompts for language models as well as integrating vector databases through Python utilities; 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 2w
vs
Trust & integrity
| Signal | prompttools | langstream |
|---|---|---|
| Maintenance | Slowing (177d since push) As of 2w · github_public_v1 | Dormant (946d since push) As of 2w · github_public_v1 |
| Provenance | Not a fork · Organization account As of 2w · github_public_v1 | Not a fork · Personal account As of 2w · github_public_v1 |
| OSV dependency advisories | Published findings As of 1mo · osv@v1 | No lockfile (source not queried) As of 1mo · 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
- 3.0k
- langstream
- 417
Forks
- prompttools
- 255
- langstream
- 28
Open issues
- prompttools
- 41
- langstream
- 3
Language
- prompttools
- Python
- langstream
- Python
Adopt for
- prompttools
- Prompttools aims to support developers in the testing and experimentation of prompts for language models as well as integrating vector databases through Python utilities.
- 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
- Apache-2.0
- 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
- 177d
- langstream
- 946d
Open issues (now)
- prompttools
- 41
- langstream
- 3
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.
- Pricing: PromptsTools is open-source under the Apache-2.0 license, making it free to use but with no official support available..
- Tags unique to prompttools: deep-learning, embeddings, large language models, llms.
- Also covers Vector Databases.
- Prompttools aims to support developers in the testing and experimentation of prompts for language models as well as integrating vector databases through Python utilities.
When NOT to use prompttools
- Last GitHub push was 195 days ago (slowing maintenance, Feb 11, 2026). Validate activity before betting a new project on prompttools.
- 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.
- Vector Databases: Don't reach for a dedicated vector DB under ~100k vectors; pgvector on your existing Postgres is simpler to operate.
Choose langstream if…
- License: langstream is MIT, prompttools 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 964 days ago (dormant maintenance, Jan 3, 2024). 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 Aug 7, 2026
- GitHub forks (hegelai/prompttools) · observed Aug 7, 2026
- Last push (hegelai/prompttools) · observed Feb 11, 2026
- License file (Apache-2.0) · observed Aug 7, 2026
- Decision facts (enrichment) · observed Jul 12, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
- GitHub stars (rogeriochaves/langstream) · observed Aug 7, 2026
- GitHub forks (rogeriochaves/langstream) · observed Aug 7, 2026
- Last push (rogeriochaves/langstream) · observed Jan 3, 2024
- License file (MIT) · observed Aug 7, 2026
- Decision facts (enrichment) · observed Jul 12, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
GitHub stars on cards: prompttools 3.0k · langstream 417 (synced Aug 7, 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; Pricing: PromptsTools is open-source under the Apache-2.0 license, making it free to use but with no official support available.; Tags unique to prompttools: deep-learning, embeddings, large language models, llms; Also covers Vector Databases; Prompttools aims to support developers in the testing and experimentation of prompts for language models as well as integrating vector databases through Python utilities.
- 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, python; LangStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability.
- When should I avoid prompttools?
- Last GitHub push was 195 days ago (slowing maintenance, Feb 11, 2026). Validate activity before betting a new project on prompttools. 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. 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 langstream?
- Last GitHub push was 964 days ago (dormant maintenance, Jan 3, 2024). 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 (3,046 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.