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  4. LangChain4j
LangChain4j logo

LangChain4j

RAG Frameworks

Java framework for integrating LLMs, RAG pipelines, tools, and agent workflows into JVM applications.

Visit websiteDocs

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Explore products with related capabilities. Check their details for your use case.

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Haystack logo
Haystack

RAG Frameworks· haystack.deepset.ai

Open source

Open-source framework for production LLM applications, RAG pipelines, search, and agentic workflows.

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OverviewProduct evaluationResourcesCompany evidence

Product evaluation

Review LangChain4j for your team’s requirements before a technical pilot.

Commercial model

Open source

View vendor website

Listed pricing category. Confirm current rates, limits and enterprise contract terms with the vendor.

Implementation

API listed · Open source listed

DocumentationSource repository

Validate integration, deployment and operational requirements in your own environment.

Enterprise review

Security, data handling, support and contract terms require vendor confirmation. Linked sources do not establish certification or approval.

Company evaluation and adoption evidence

Enterprise fit

Buyer brief for procurement and architecture review

Source-labeled signals for cost, reliability, security, integration, and adoption proof. Missing compliance evidence is shown as a gap, not guessed.

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Inferred

Commercial model

Open source profile signal; exact enterprise terms need buyer review.

View source
Needs verification

Reliability

No status page, uptime, or SLA evidence attached

Buyer recommendation

Shortlist only after verifying Reliability and Security/compliance.

API signal supports workflow automation.Docs are linked for implementation review.Open-source path can reduce lock-in review.At least one buyer evidence source is linked or verified.

Real data backfill while adoption proof grows

These are source-linked enrichment paths for missing fields. They are treated as proxies until claimed-company data and first-party tokens& adoption events replace them.

GitHub repository APIfreeStars, forks, license, topics, releases, default branch, repo freshness, and public contributor signal.OpenSSF ScorecardfreeOpen-source security posture checks for repos before enterprise review.npm downloads API

AgentRank trust profile

Public proof buyers and agents can trust

AgentRank

51

Public signals · ★ 13,358

Trust Score

47

observed

Category Rank

#7

RAG Frameworks · public signals

Protocols

API, SDK

Agent-readable metadata

Tracked Developers

0

Known active developer activity

Profile Status

Unclaimed

Owner action needed

Trust Registry

AgentRank evidence file
observed

Source breakdown

GitHub13,358

68% confidence

Protocol support

APISDK
Adoption over time
Last 8 weeks+166 GitHub stars in 30d · cohort private · trust 47

Timeline appears after verified events.

We do not draw a fake adoption chart before live usage, self-reported proof, or challenge activity exists for this product.

Private (N<7)

active developers

Private (N<7)

verified adoptions

Private (N<7)

retention

Growth and Enterprise capabilities

Developer identities, account mapping, retention cohorts, and competitor overlap are available on Growth and Enterprise plans.

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Developer identities
See the builders behind saves, docs clicks, API calls, and retained usage.
Account map
Resolve developer activity into companies, teams, and enterprise accounts.
Retention cohorts
Track first API call through 7/30/90-day retention and expansion.
Competitor overlap
Find developers evaluating alternatives and switching between tools.
Category benchmark
Resources
Official siteWEBSITE

Official product homepage or source page.

DocumentationDOCS

Builder documentation or implementation guide.

GitHub repositoryGITHUB

Public source repository used for verification.

Company details

Sign in to follow this company, vote for its product, or save it to your workspace.

Community support for LangChain4j. Votes do not verify product usage.

Pricing
Open source
Open source
Yes
API available
Yes

GitHub Stats

Stars
13,358
Forks
2,658
Issues
1,093
26,924
3,388
Open source
Firecrawl logo
Firecrawl

RAG Frameworks· firecrawl.dev

Freemium

Web data API and open-source crawling stack for turning sites into clean markdown, structured data, and agent-ready content for RAG and automation pipelines.

197,720
10,447
Open source
Microsoft MarkItDown logo
Microsoft MarkItDown

RAG Frameworks· github.com

Open source

Microsoft MarkItDown is an open-source document conversion tool that turns files and office documents into Markdown for LLM, RAG, and text-analysis pipelines.

194,215
14,611
Open source
pgContext logo
pgContext

RAG Frameworks· github.com

Open source

Apache-licensed AI search engine built directly into Postgres for semantic retrieval and agent context workflows.

266
24
Open source

Keep evaluating LangChain4j

Comparisons, category adoption data, and shortlist guides that answer the questions this profile raises next.

Check the adoption evidence

  • RAG Frameworks developers actually keep usingFiltered to products with verified usage events, cohort breadth, and retention.
  • AgentRank category rankingsHow every category is ordered by adoption proof, trust, and protocol support.
  • Best AI Tools for RAGShortlist guide for this category, with the tradeoffs written out.
  • Best Open Source AI ToolsShortlist guide for this category, with the tradeoffs written out.

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Needs verification

Security/compliance

No security, trust, or compliance source attached

Source linked

Integration fit

API profile signal with implementation source linked

View source
Needs verification

Adoption proof

No public adoption proof attached

Vendor value loop

Vendors receive anonymous aggregate evaluation demand by default. Account details are shared only after explicit buyer contact or consent.

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free
Public JavaScript package download trends for SDK/tool adoption proxies.
PyPI StatsfreePublic Python package download trends for SDK/tool adoption proxies.
Product Hunt APIfreemiumLaunch timing, maker activity, and early-adopter demand signals when products launch publicly.

Agent-readable protocol evidence raises trust and commercial readiness.

Benchmark proof

Automated measurements unavailable

Automated performance measurements are unavailable until a separately verified empirical evaluator is configured. Community reports do not unlock this component.

Trust gaps

Verify publisher ownership
Send SDK/API telemetry
Automated performance measurements unavailable

Enterprise verification can enrich evidence and export proof packages, but cannot buy rank.

Next best action

Verify ownership to manage LangChain4j.

Review aggregate activity and connect product usage evidence. Private reports retain their existing permissions and plan requirements.

Public projects and activity accumulate here before your company joins. Claim this existing profile to manage it and review aggregate activity.

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Compare activation, retention, and growth against your market.
Recommended actions
Prioritized DevRel, product, and sales plays based on live adoption signals.