Registry › Compare › CopilotKit vs Tambo

CopilotKit vs Tambo

CopilotKit leads on trust: 80.2/100 (Grade A) against 79.8/100 (Grade B), a 0.4-point gap. CopilotKit leads on maintenance and adoption, and rests on broader evidence; Tambo leads on supply-chain integrity and transparency.

A CopilotKit 80.2

The Frontend Stack for Agents & Generative UI. React, Angular, Mobile, Slack, and more. Makers of the AG-UI Protocol

CopilotKit/CopilotKit · #163 overall · #4 UI & App Builders · coverage A (4/5)

Choose CopilotKit if maintenance and adoption matter most.

+6.1Maintenance
+3.4Adoption: 258.1k weekly downloads against 6.9k
A vs BEvidence coverage: 4 of 5 independent signal types, against 3

B Tambo 79.8

Generative UI SDK for React

tambo-ai/tambo · #171 overall · #5 UI & App Builders · coverage B (3/5)

Choose Tambo if supply-chain integrity and transparency matter most.

+8.3Safety / Integrity: 100% of recent commits signed, against 52%
+4.0Transparency

Where they differ

10.1

Safety / IntegrityTambo +8.3

18.4

8.5

TransparencyTambo +4.0

12.5

20.0

MaintenanceCopilotKit +6.1

13.9

18.2

AdoptionCopilotKit +3.4

14.8

+5.4

Runtime calibrationCopilotKit +3.2

+2.2

1 dimension identical: Identity 18.0 · Full evidence table

An independent, evidence-based trust comparison of CopilotKit 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	CopilotKitCopilotKit/CopilotKit	Tambotambo-ai/tambo
HVTrust score	80.2	79.8
Evidence grade	A	B
Coverage grade	A	B
Overall rank	#163	#171
Rank in UI & App Builders	#4	#5
GitHub stars	38.2k	11.2k
Last updated	today	today
Build provenance	Yes	Yes
OSSF Scorecard	—	4.7 / 10
License	MIT	MIT
Downloads	258k/wk	7k/wk
Trust dimensions (points earned)
Safety / integrity / 25	10.1	18.4
Identity & provenance / 18	18.0	18.0
Transparency / 17	8.5	12.5
Maintenance / 20	20.0	13.9
Adoption / 20	18.2	14.8
Runtime capability surface (full matrix)
MCP server	Implemented	Declared
External providers	1 — Anthropic	2 — Anthropic, OpenAI
Requires API keys	No	Yes
Plugin surface	plugins	plugins
Provenance drift	Match	Match

Open in the live compare tool → CopilotKit profile Tambo profile More UI & App Builders →

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 →