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Compare scores, permissions, risks, and fit in one decision-focused table.

DimensionOnyxOpen Source AI Platform - AI Chat with advanced features that works with every LLMHevy MCPManage your Hevy workout data from AI assistants via MCP.
FMRS27 / 100 · D77 / 100 · B
Reliability1 / 2012 / 20
Security and permissions5 / 2016 / 20
Maintenance13 / 2016 / 20
Documentation6 / 2018 / 20
Setup experience2 / 2015 / 20
Best for
  • Teams needing self-hosted AI platform
  • Enterprises requiring RAG and advanced search
  • Developers wanting custom AI agents
  • Hevy PRO users who want AI assistants to directly access their workout data
  • People who prefer using MCP clients like Claude, Cursor, Codex for fitness tracking
  • Anyone needing summaries and insights from their training data
Not for
  • Small projects that don't need complex deployment
  • Users only interested in simple chat UI
  • Users without a Hevy PRO subscription (API key required)
  • Users who want to use the server without an API key
  • Those needing delete workflows (Hevy API does not expose delete endpoints)
Required permissions
  • Network access for web search and connector sync
  • Code execution in sandbox
  • Storage and processing of user data
  • Requires HEVY_API_KEY environment variable for Hevy API authentication
  • Can create, update, and replace workouts, routines, folders, templates, and body measurements via tools
  • Read operations can fetch workouts, routines, folders, templates, history, and user info
Risks and side effects
  • Self-hosting requires operational expertise
  • Potential data privacy and security concerns
  • Costs if relying on external LLM providers
  • API key can be misused if leaked; do not expose in URLs, logs, or screenshots
  • Create operations may produce duplicates on retry; update operations replace existing records
  • The server sends data to the Hevy API and may send telemetry to external services unless disabled
Supported clientsClaude Desktop, Cursor, Codex, Antigravity
Tools026