Registry › Compare › Langflow vs Sim

Langflow vs Sim

Langflow leads on trust: 78.9/100 (Grade B) against 65.3/100 (Grade B), a 13.6-point gap. Langflow leads on adoption and rests on broader evidence.

B Langflow 78.9

Langflow is a powerful tool for building and deploying AI-powered agents and workflows.

langflow-ai/langflow · #180 overall · #6 Workflow Platforms · coverage A (4/5)

Choose Langflow if adoption matters most.

+7.1Adoption: 155.7k GitHub stars against 29.8k
A vs CEvidence coverage: 4 of 5 independent signal types, against 2

B Sim 65.3

Sim is the collaborative workspace to build, deploy, and monitor AI agents and workflows. Used by 100,000+ builders.

simstudioai/sim · #494 overall · #11 Workflow Platforms · coverage C (2/5)

Sim doesn't lead on any scored dimension in this pair.

Where they differ

11.8

Safety / IntegritySim +0.1

11.9

19.9

MaintenanceSim +0.1

20.0

17.8

AdoptionLangflow +7.1

10.7

+5.4

Runtime calibrationLangflow +6.7

-1.3

2 dimensions identical: Identity 10.8 · Transparency 13.2 · Full evidence table

An independent, evidence-based trust comparison of Langflow and Sim, two Workflow Platforms projects in the HVTracker registry. Scores come from public, checkable signals — supply-chain provenance, OSSF Scorecard, maintenance, and adoption — not popularity.

Full evidence

Signal	Langflowlangflow-ai/langflow	Simsimstudioai/sim
HVTrust score	78.9	65.3
Evidence grade	B	B
Coverage grade	A	C
Overall rank	#180	#494
Rank in Workflow Platforms	#6	#11
GitHub stars	155.7k	29.8k
Last updated	1d ago	today
Build provenance	No	No
OSSF Scorecard	5.5 / 10	5.5 / 10
License	MIT	Apache-2.0
Downloads	9k/wk	—
Trust dimensions (points earned)
Safety / integrity / 25	11.8	11.9
Identity & provenance / 18	10.8	10.8
Transparency / 17	13.2	13.2
Maintenance / 20	19.9	20.0
Adoption / 20	17.8	10.7
Runtime capability surface (full matrix)
MCP server	Implemented	Implemented
External providers	1 — Postgres	7 — Anthropic, Browserbase, E2B, …
Requires API keys	No	No
Plugin surface	plugins	—
Provenance drift	Match	—

Open in the live compare tool → Langflow profile Sim profile More Workflow Platforms →

How to read this: HVTrust (0–100) weighs supply-chain signals (provenance, OSSF Scorecard, signed commits, open license) alongside real-world adoption, scaled by an evidence-confidence factor. Grade bands: A ≥ 80, B ≥ 65, C ≥ 50, D < 50. Signals refresh daily. Full methodology v4.4 →