Horizon Fidelity Monitor vs Spanlens
A side-by-side look at the Horizon Fidelity Monitor and Spanlens MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Horizon Fidelity Monitor for monitoring work as a local process; choose Spanlens for monitoring as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Horizon Fidelity Monitor when
- You need dedicated capabilities in the Monitoring domain.
- You prefer a local stdio subprocess transport.
Choose Spanlens when
- You need dedicated capabilities in the Monitoring domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: API key required.
- You have the keys it needs:
SPANLENS_API_KEY.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Monitoring | Monitoring |
| Quality signal | 40/100 · Fair | 59/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | Not declared | API key required |
| Pricing | Not declared | Free |
| Required env vars | None listed | SPANLENS_API_KEY |
| Verified owner | Community listing | Community listing |
| GitHub stars | 0 | 13 |
| Directory activity | 0 views 0 installs 0 upvotes | 4 views 0 installs 0 upvotes |
| Tools | Not listed | Not listed |
| Full listing | View Horizon Fidelity Monitor | View Spanlens |
Tools & capabilities
Horizon Fidelity Monitor tools
No tool names declared yet. Check the project README from the listing page.
Spanlens tools
No tool names declared yet. Check the project README from the listing page.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Horizon Fidelity Monitor
{
"mcpServers": {
"horizon-fidelity-monitor": {
"command": "uvx",
"args": [
"horizon-monitor"
]
}
}
}
Spanlens
{
"mcpServers": {
"spanlens-spanlens-2": {
"command": "npx",
"args": [
"-y",
"@spanlens/cli"
],
"env": {
"SPANLENS_API_KEY": "YOUR_SPANLENS_API_KEY_HERE"
}
}
}
}
Frequently asked questions
Horizon Fidelity Monitor is categorized under Monitoring and uses a local stdio subprocess. Spanlens belongs to Monitoring and uses a local stdio subprocess. Pick Horizon Fidelity Monitor for monitoring work and Spanlens for monitoring.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Horizon Fidelity Monitor has no declared pricing — check the project's own site. Spanlens is listed as free. Auth: api key required. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add horizon-fidelity-monitor and spanlens-spanlens-2 as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Horizon Fidelity Monitor has a quality signal of 40/100 (Fair) with 0 views, 0 installs and 0 GitHub stars. Spanlens has 59/100 (Good) with 4 views, 0 installs and 13 GitHub stars.