# PostHog vs Statsig

> Statsig scores 72.3 (BB) on agent readiness against PostHog's 68.4 (B), and leads in 2 of 7 scored categories. PostHog leads on agent ergonomics, security & auth, maintenance & community and transparency & trust. Both do analytics query. Category scores, facts, verdicts and…

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- Updated: 2026-10-08

Statsig scores 72.3 (BB) on agent readiness against PostHog's 68.4 (B), and leads in 2 of 7 scored categories. PostHog leads on agent ergonomics, security & auth, maintenance & community and transparency & trust. Both do analytics query.

- PostHog: grade B, 68.4/100, rank #181 of 722. Markdown https://www.anchorterminal.com/tools/posthog.md · JSON https://www.anchorterminal.com/api/v1/tools/posthog.json
- Statsig: grade BB, 72.3/100, rank #94 of 722. Markdown https://www.anchorterminal.com/tools/statsig.md · JSON https://www.anchorterminal.com/api/v1/tools/statsig.json

## Which one, for what

### PostHog (B)

Good for: An agent that answers product questions in SQL or with funnel, retention and trends queries, and that manages feature flags, experiments and error tracking in the same project.

Ahead on:
- Agent ergonomics, 78 against 71
- Security & auth, 84 against 74
- Maintenance & community, 89 against 81
- Transparency & trust, 83 against 75

Also in its favour:
- Open source

Watch for: 31 incidents on the status page between 9 July and 6 October 2026, four of them analytics query timeouts or failures

### Statsig (BB)

Good for: An agent that creates, updates and cleans up feature gates, dynamic configs and experiments, and reads experiment results and audit history.

Ahead on:
- Reliability, 79 against 74

Also in its favour:
- Agent-ready, a grade of BB or better
- No incidents deducted, where PostHog loses 7 points for them

Watch for: Console API errors carry only `status` and `message`, and the spec documents no 429 response


## Score by category

| Category | Weight | PostHog | Statsig | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 74 | 79 | Statsig +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 81 | 82 | Statsig +1 |
| Agent ergonomics | 13% (16.2 this run) | 78 | 71 | PostHog +7 |
| Security & auth | 14% (17.5 this run) | 84 | 74 | PostHog +10 |
| Payments & pricing | 10% (12.5 this run) | 40 | 40 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 89 | 81 | PostHog +8 |
| Transparency & trust | 7% (8.8 this run) | 83 | 75 | PostHog +8 |
| Negative events | ≤15 | -7 | 0 | |
| **Total** | | **68.4 · B** | **72.3 · BB** | |

## Facts side by side

| Fact | PostHog | Statsig |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | PostHog Inc. | Amplitude, Inc. |
| Hosted endpoint | `https://us.posthog.com` | `https://api.statsig.com/v3/mcp` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | MIT for the repository outside the `ee` directory, which has its own licence. PostHog Cloud is a hosted service under PostHog's terms | Proprietary hosted service under Statsig's self-service or enterprise terms. The SDKs and the agent skills repository on GitHub are ISC |
| Tools exposed | 1096 | 18 |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| MCP registry | `io.github.PostHog/mcp` | `com.statsig/statsig-mcp-server` |
| Last release | 2026-10-05 | 2026-09-28 |
| Terms last updated | 2026-06-29 | 2025-08-04 |
| Privacy policy last updated | 2026-06-29 | 2026-08-31 |
| Customer content may train models | yes, with an opt-out | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 40k stars, 15.2M npm/wk | 4.2M npm/wk, 894k PyPI/wk |

## Verdicts

**PostHog.** PostHog suits agents that need to query product data and manage flags or experiments. Its hosted MCP server has OAuth scopes, a read-only mode and a one-tool CLI mode over 1,096 tools. The status page shows 31 incidents in 90 days, four on analytics queries, and three security incidents were disclosed in the last year.

**Statsig.** Statsig suits agents that manage feature gates and experiments and read their results. Its MCP server has 18 default tools, OAuth, read-only access by project and role, and a confirmation on updates. Errors carry only a status and a message, no idempotency keys were found, and the privacy notice is Amplitude's and doesn't name Statsig.

## Before you call either

### PostHog

1. Add `?readonly=true` or the `x-posthog-read-only` header to the MCP URL unless the task needs writes
2. Pin the session with `x-posthog-project-id`, which also removes the `switch-project` and `switch-organization` tools
3. In CLI mode run `info <tool>` once before `call`, and send one `exec` command per request
4. On a 429 with code `api_queries_budget_exceeded`, wait for `Retry-After` and read `X-PostHog-Query-Budget-Remaining-Bytes`
5. Page SQL results by keyset on `timestamp`. `OFFSET` returns 400 for personal API keys, and results cap at 50,000 rows

### Statsig

1. Connect to https://api.statsig.com/v3/mcp. The official MCP registry entry still lists the V1 URL, which has 93 tools
2. Call `get_context` first to learn the project, your permissions and the review settings
3. Read the resource before `gate_update`, `experiment_update` or `dynamic_config_update`. They replace the whole resource, so resend every field you want kept
4. Use `discover_tools` for partial edits, and fetch a fresh `operationHandle` when one expires
5. On a 429 slow down and back off with jitter. Rejected attempts count towards the quota of about 1,800 mutations per 15 minutes

## Questions

### Which is better for AI agents, PostHog or Statsig?

Statsig scores 72.3 (BB) on agent readiness against PostHog's 68.4 (B), and leads in 2 of 7 scored categories. PostHog leads on agent ergonomics, security & auth, maintenance & community and transparency & trust.

### Do PostHog and Statsig need an API key?

Both take an API key or an OAuth sign-in.

### Can an agent call PostHog and Statsig without installing anything?

Yes. PostHog has a hosted endpoint at https://us.posthog.com and Statsig at https://api.statsig.com/v3/mcp.

### Are PostHog and Statsig open source?

PostHog is open source (MIT for the repository outside the `ee` directory, which has its own licence. PostHog Cloud is a hosted service under PostHog's terms). No open-source release is listed for Statsig.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/posthog-vs-statsig.json, and with the fewest tokens: https://www.anchorterminal.com/compare/posthog-vs-statsig.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "posthog", "b": "statsig"}`. From a terminal: `anchor compare posthog statsig`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/posthog.json and https://www.anchorterminal.com/api/v1/tools/statsig.json

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