# Heap vs PostHog

> PostHog scores 68.4 (B) on agent readiness against Heap's 53 (D), and leads in every scored category. Both do analytics events. Category scores, facts, verdicts and agent notes side by side.

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- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-08

PostHog scores 68.4 (B) on agent readiness against Heap's 53 (D), and leads in every scored category. Both do analytics events.

- Heap: grade D, 53/100, rank #488 of 629. Markdown https://www.anchorterminal.com/tools/heap.md · JSON https://www.anchorterminal.com/api/v1/tools/heap.json
- PostHog: grade B, 68.4/100, rank #171 of 629. Markdown https://www.anchorterminal.com/tools/posthog.md · JSON https://www.anchorterminal.com/api/v1/tools/posthog.json

## Which one, for what

### Heap (D)

Good for: An agent that records backend events or enriches user and account properties in a company's existing Heap project, or that files privacy deletions.

Also in its favour:
- No incidents deducted, where PostHog loses 7 points for them

Watch for: No query, export or definitions endpoint in the developer reference. Reading results needs the app, Heap Connect or the MCP server we couldn't read

### 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:
- Schema & documentation, 81 against 57
- Agent ergonomics, 78 against 49
- Security & auth, 84 against 41
- Payments & pricing, 40 against 25
- Maintenance & community, 89 against 63
- Transparency & trust, 83 against 64

Also in its favour:
- Free to start without a card
- 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


## Score by category

| Category | Weight | Heap | PostHog | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 72 | 74 | PostHog +2 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 57 | 81 | PostHog +24 |
| Agent ergonomics | 13% (16.2 this run) | 49 | 78 | PostHog +29 |
| Security & auth | 14% (17.5 this run) | 41 | 84 | PostHog +43 |
| Payments & pricing | 10% (12.5 this run) | 25 | 40 | PostHog +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 63 | 89 | PostHog +26 |
| Transparency & trust | 7% (8.8 this run) | 64 | 83 | PostHog +19 |
| Negative events | ≤15 | 0 | -7 | |
| **Total** | | **53 · D** | **68.4 · B** | |

## Facts side by side

| Fact | Heap | PostHog |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Contentsquare (Content Square, Inc.) | PostHog Inc. |
| Hosted endpoint | `https://heapanalytics.com` | `https://us.posthog.com` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Freemium |
| Price for analytics events | not published | $0.0001 per transaction |
| x402 | no | no |
| Licence | Proprietary service under Contentsquare's master services agreement. The React Native bridge and the Node client on npm are MIT | MIT for the repository outside the `ee` directory, which has its own licence. PostHog Cloud is a hosted service under PostHog's terms |
| Tools exposed | none | 1096 |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| MCP registry | not listed | `io.github.PostHog/mcp` |
| Last release | 2026-10-06 | 2026-10-05 |
| Terms last updated | no date given | 2026-06-29 |
| Privacy policy last updated | couldn't be read | 2026-06-29 |
| Customer content may train models | yes | yes, with an opt-out |
| 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 | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 213 npm/wk | 40k stars, 15.2M npm/wk |

## Verdicts

**Heap.** Heap's server-side API suits an agent that records events. Limits are published, bulk calls take 1,000 items and track accepts an idempotency key. The API returns no analytics, and ingest calls carry no secret beyond the environment ID. Heap's help centre lists a Heap MCP article, which a bot check stopped us reading, so the MCP server is ungraded.

**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.

## Before you call either

### Heap

1. Send EU projects to https://c.eu.heap-api.com instead of https://heapanalytics.com. The path stays the same
2. Pass one of `identity` or `user_id` on track, never both
3. Set `idempotency_key` on every track event so a retry doesn't duplicate it
4. Stay under 30 requests per 30 seconds per identity, or batch up to 1,000 events in one bulk call
5. For deletion, exchange the app_id and API key of the Main Production environment for a token first. Any other environment ID returns Unauthorized

### 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

## Questions

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

PostHog scores 68.4 (B) on agent readiness against Heap's 53 (D), and leads in every scored category.

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

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

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

Yes. Heap has a hosted endpoint at https://heapanalytics.com and PostHog at https://us.posthog.com.

### Are Heap and PostHog open source?

No open-source release is listed for Heap. 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).


## For agents

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

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