Langflow vs Sim
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.
Langflow leads on trust — 79.4/100 (Grade B) vs 65.3/100 (Grade B), a 14.1-point gap. Full breakdown below.
| Signal | Langflowlangflow-ai/langflow | Simsimstudioai/sim |
|---|---|---|
| HVTrust score | 79.4 | 65.3 |
| Evidence grade | B | B |
| Coverage grade | A | C |
| Overall rank | #90 | #260 |
| Rank in Workflow Platforms | #3 | #9 |
| GitHub stars | 153.9k | 29.5k |
| Last updated | today | today |
| Build provenance | No | No |
| OSSF Scorecard | 5.5 / 10 | 5.5 / 10 |
| License | MIT | Apache-2.0 |
| Downloads | 21k/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 | 20.0 | 20.0 |
| Adoption / 20 | 18.2 | 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 | — |
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 v4.3 →