# Harness Feature Management & Experimentation vs OpenPanel (slim)

> Harness Feature Management & Experimentation scores 69.2 (B) to OpenPanel's 61 (C) for event analytics. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/harness-fme-vs-openpanel.md (~4,500 tokens) · this version ~2,330 tokens · JSON https://www.anchorterminal.com/compare/harness-fme-vs-openpanel.json · canonical https://www.anchorterminal.com/compare/harness-fme-vs-openpanel
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-07
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Harness Feature Management & Experimentation scores 69.2 (B) on agent readiness against OpenPanel's 61 (C), and leads in 3 of 7 scored categories. OpenPanel leads on payments & pricing and transparency & trust. Both do event analytics.

- Harness Feature Management & Experimentation: B 69.2, rank #258 of 1510 · https://www.anchorterminal.com/tools/harness-fme.min.md
- OpenPanel: C 61, rank #631 of 1510 · https://www.anchorterminal.com/tools/openpanel.min.md
- Harness Feature Management & Experimentation, good for Teams already on Harness, or Split customers, who want agents to inspect and change flags and segments with guard rails. Ahead on Reliability, 80 against 70; Agent ergonomics, 83 against 54; Security & auth, 79 against 41. Also Runs on your own machine.
- OpenPanel, good for Small and mid-sized teams wanting EU-hosted or self-hosted product analytics an agent can query. Ahead on Payments & pricing, 35 against 15; Transparency & trust, 83 against 61. Also Free to start without a card; Open source.

| Category | Harness Feature Management & Experimentation | OpenPanel |
| --- | --- | --- |
| Reliability (16%) | 80 | 70 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 71 | 75 |
| Agent ergonomics (13%) | 83 | 54 |
| Security & auth (14%) | 79 | 41 |
| Payments & pricing (10%) | 15 | 35 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 81 | 83 |
| Transparency & trust (7%) | 61 | 83 |

| Fact (where they differ) | Harness Feature Management & Experimentation | OpenPanel |
| --- | --- | --- |
| Vendor | Harness Inc. | OpenPanel AB |
| Hosted endpoint | `https://mcp.harness.io/mcp` | `https://api.openpanel.dev/mcp` |
| Transports | HTTP, stdio, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | API key |
| Price for event analytics | not published | $30 per month (plan) |
| Licence | none | AGPL-3.0 |
| Tools exposed | 11 | 51 |
| Last release | 2026-11-04 | 2026-11-06 |
| Terms last updated | no date given | 2026-05-21 |
| Privacy policy last updated | no date given | 2026-05-21 |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | not found in the text | yes |
| Popularity | 8.8k npm/wk | 339k npm/wk |

Why the edge:
- Security & auth, Harness Feature Management & Experimentation +38: Harness Feature Management & Experimentation 79 (Admin API keys with combinable roles that can't be widened after creation, Harness PATs and SATs for central management, and Harness Platform OAuth on the hosted MCP endpoint. Credentials travel in headers (28 of 30). HARNESS_READ_ONLY removes every write, writes go through elicitation with a risk threshold for auto-approval, and FME change requests add approval for flag changes (19 of 20). No prompt-injection guidance; the tools return flag names, descriptions and rule data written by people (3 of 15). FME admin, environment and object audit logs, plus structured MCP audit events to file, webhook or OpenTelemetry sinks (13 of 15). SOC 1 and SOC 2 Type II, ISO 27001, 27017 and 27018, FedRAMP 20x, a security@harness.io disclosure route with a 24-hour response, a private bug bounty on request and annual external penetration tests. No security.txt (16 of 20). 28+19+3+13+16 = 79.); OpenPanel 41 (Client credentials with three types (write, read for one project, root for the organisation), created and deleted in the dashboard (25), less 10 because the docs give `?token=` in the MCP URL as an option (15 of 30). Read clients are read-only and limited to one project, and onboarding creates a read-only MCP client. No approval step for root-client writes (14 of 20). Tools return event properties, page titles and profile data sent from tracked sites, and no prompt-injection guidance was found (3 of 15). No audit log was found (0). SECURITY.md with a private advisory route and response times, a valid security.txt, and no bug bounty or certification found (9 of 20). 15+14+3+0+9 = 41.)
- Agent ergonomics, Harness Feature Management & Experimentation +29: Harness Feature Management & Experimentation 83 (11 consolidated tools, and `--toolsets=fme` narrows the server to FME (25). Flag lists filter server-side by name, tag and rollout status, and the Admin API paginates with markerLimit (17 of 20). Documented status codes, 429 headers, and a harness_diagnose tool. Error bodies aren't documented per endpoint (14 of 20). harness_list and harness_get carry readOnlyHint, write tools ask for confirmation by elicitation, and harness_delete is marked destructive. No idempotency keys (15 of 20). Two required settings (API key, optional org and project, account ID read from the token); a Python Admin API wrapper and CLI, and SDKs in more than a dozen languages for evaluation (12 of 15). 25+17+14+15+12 = 83.); OpenPanel 54 (51 MCP tools, more than 30 (5). We added 3 because a read client doesn't get the 9 dashboard management tools (8 of 25). Insights endpoints take startDate, endDate, range, filters, cursor and limit (18 of 20). Errors aren't documented beyond 401 and 429 (12 of 20). No readOnlyHint or destructiveHint in the MCP source, no idempotency keys; delete_dashboard refuses a non-empty dashboard without forceDelete (3 of 20). Few required parameters, and SDKs for JavaScript, React, Next.js, Vue, React Native, Swift, Kotlin and Python (13 of 15). 8+18+12+3+13 = 54.)
- Transparency & trust, OpenPanel +22: Harness Feature Management & Experimentation 61 (A closed service under Harness's subscription terms; the MCP server is MIT (18 of 30). The privacy statement covers website and sales data and defers customer data to the customer agreement and a published DPA; retention periods for customer data weren't found (18 of 30). A versioning policy for SDKs with support windows, and Split-era API endpoints marked deprecated with migration guides (14 of 20). Sub-processors are on the trust centre, which we didn't read, and the security page doesn't name data locations (10 of 20). 18+18+14+10 = 60.); OpenPanel 83 (AGPL-3.0 for the whole product, and the about page says there is no enterprise edition (30). Terms and privacy policy of 21 May 2026 agree, with a DPA published, transient IP use, data ownership kept by the customer, and providers named with locations. Retention periods are general rather than stated in days (22 of 30). No deprecation policy or dated notices found; v3.0.0 was a major release on 16 October 2026 (4 of 20). Sub-processors and data locations disclosed in the privacy policy (Hetzner, Germany) (18 of 20). 30+22+4+18 = 74.)
- Payments & pricing, OpenPanel +20: Harness Feature Management & Experimentation 15 (No x402, MPP or L402 (0). No FME prices are published; harness.io/pricing lists FME only under Enterprise, priced by quotation (0). The docs describe a Start FME Free Plan step inside a Harness account; its limits and whether a card is needed aren't stated (15 of 20). A person signs up for Harness in a browser and creates a key or token (0). 0+0+15+0 = 15.); OpenPanel 35 (No x402, MPP or L402 (0). Public prices by event tier from $2.50 a month, with no overage charges; tiers rather than a per-event rate (15 of 20). 30-day free trial with no card, and free self-hosting (20). Signup is in a browser and client keys are created in the dashboard (0). 0+15+20+0 = 35.)
- Reliability, Harness Feature Management & Experimentation +10: Harness Feature Management & Experimentation 80 (Graded on the hosted FME Admin API with the hosted lines. Statuspage at status.harness.io with an FME component among 196 (20). In the 90 days from 8 August, two FME incidents: API write operations returned 499 errors for 30 minutes on 20 August (minor) and the FME user interface was unavailable for 15 minutes on 23 August (major, interface only; flag evaluation was unaffected per the post). No API outage of an hour or more (20 of 30). About 20 Admin API requests per 10 seconds per organisation and per IP, documented on the MCP page (15). 429 responses carry remaining and reset headers with guidance to wait for the larger reset, and the MCP server backs off and retries three times (15). No SLA was found on harness.io/pricing or the FME docs (0). FME is generally available and the MCP server is at 3.2.40 (10). 20+20+15+15+0+10 = 80.); OpenPanel 70 (Graded on OpenPanel Cloud with the hosted lines. OpenStatus page at status.openpanel.dev with API and Tracker components (20). In the 90 days from 8 August, one incident, degraded API performance for about two hours on 1 October 2026, caused by Hetzner private-network problems reaching the ClickHouse servers (15 of 30). Limits are documented with numbers for MCP (60 a minute per client) and the Export, Insights and Manage APIs (15). The docs say a 429 is returned and to back off exponentially; no Retry-After or idempotency guidance (10 of 15). No SLA was found (0). Generally available (10). 20+15+15+10+0+10 = 70.)