OpenUI vs Tambo
OpenUI leads on trust: 88.7/100 (Grade A) against 79.8/100 (Grade B), a 8.9-point gap. OpenUI leads on maintenance and adoption.
The Open Standard for Generative UI
Choose OpenUI if maintenance and adoption matter most.
- +6.0Maintenance
- +1.3Adoption: 44.3k weekly downloads against 6.9k
- +0.6Safety / Integrity: OSSF Scorecard 5.2 against 4.7
Generative UI SDK for React
Tambo doesn't lead on any scored dimension in this pair.
Where they differ
1 dimension identical: Identity 18.0 · Full evidence table
An independent, evidence-based trust comparison of OpenUI and Tambo, two UI & App Builders projects in the HVTracker registry. Scores come from public, checkable signals — supply-chain provenance, OSSF Scorecard, maintenance, and adoption — not popularity.
Full evidence
| Signal | OpenUIthesysdev/openui | Tambotambo-ai/tambo |
|---|---|---|
| HVTrust score | 88.7 | 79.8 |
| Evidence grade | A | B |
| Coverage grade | B | B |
| Overall rank | #44 | #171 |
| Rank in UI & App Builders | #1 | #5 |
| GitHub stars | 12.9k | 11.2k |
| Last updated | 2d ago | today |
| Build provenance | Yes | Yes |
| OSSF Scorecard | 5.2 / 10 | 4.7 / 10 |
| License | MIT | MIT |
| Downloads | 44k/wk | 7k/wk |
| Trust dimensions (points earned) | ||
| Safety / integrity / 25 | 19.0 | 18.4 |
| Identity & provenance / 18 | 18.0 | 18.0 |
| Transparency / 17 | 12.9 | 12.5 |
| Maintenance / 20 | 19.9 | 13.9 |
| Adoption / 20 | 16.1 | 14.8 |
| Runtime capability surface (full matrix) | ||
| MCP server | — | Declared |
| External providers | 1 — OpenAI | 2 — Anthropic, OpenAI |
| Requires API keys | No | Yes |
| Plugin surface | — | plugins |
| Provenance drift | Match | 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 v4.4 →