# GrowthBook vs Heap

> GrowthBook scores 70.1 (BB) 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.

- Canonical: https://www.anchorterminal.com/compare/growthbook-vs-heap
- Markdown: https://www.anchorterminal.com/compare/growthbook-vs-heap.md (~2,300 tokens)
- Slim: https://www.anchorterminal.com/compare/growthbook-vs-heap.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/growthbook-vs-heap.json (this page as data, same URL with Accept: application/json)
- 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

GrowthBook scores 70.1 (BB) on agent readiness against Heap's 53 (D), and leads in every scored category. Both do analytics events.

- GrowthBook: grade BB, 70.1/100, rank #142 of 722. Markdown https://www.anchorterminal.com/tools/growthbook.md · JSON https://www.anchorterminal.com/api/v1/tools/growthbook.json
- Heap: grade D, 53/100, rank #555 of 722. Markdown https://www.anchorterminal.com/tools/heap.md · JSON https://www.anchorterminal.com/api/v1/tools/heap.json

## Which one, for what

### GrowthBook (BB)

Good for: Teams that want flags and experiments analysed against their own warehouse, with an open-source core and a self-hosted option.

Ahead on:
- Reliability, 86 against 72
- Schema & documentation, 76 against 57
- Agent ergonomics, 76 against 49
- Security & auth, 68 against 41
- Payments & pricing, 40 against 25
- Maintenance & community, 89 against 63
- Transparency & trust, 74 against 64

Also in its favour:
- Agent-ready, a grade of BB or better
- Runs on your own machine
- Free to start without a card
- Open source

Watch for: The API tools take a path and a JSON string and don't validate payloads, so correct calls depend on the bundled skills

### 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 GrowthBook loses 3 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


## Score by category

| Category | Weight | GrowthBook | Heap | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 86 | 72 | GrowthBook +14 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 76 | 57 | GrowthBook +19 |
| Agent ergonomics | 13% (16.2 this run) | 76 | 49 | GrowthBook +27 |
| Security & auth | 14% (17.5 this run) | 68 | 41 | GrowthBook +27 |
| Payments & pricing | 10% (12.5 this run) | 40 | 25 | GrowthBook +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 89 | 63 | GrowthBook +26 |
| Transparency & trust | 7% (8.8 this run) | 74 | 64 | GrowthBook +10 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **70.1 · BB** | **53 · D** | |

## Facts side by side

| Fact | GrowthBook | Heap |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | GrowthBook, Inc. | Contentsquare (Content Square, Inc.) |
| Hosted endpoint | `https://mcp.growthbook.io/mcp` | `https://heapanalytics.com` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Freemium |
| Price for analytics events | $0. per transaction | not published |
| x402 | no | no |
| Licence | MIT for the core and for the MCP server. Three enterprise directories in the main repository are under GrowthBook's enterprise licence. GrowthBook Cloud is a hosted service under the Customer Agreement | Proprietary service under Contentsquare's master services agreement. The React Native bridge and the Node client on npm are MIT |
| Tools exposed | 4 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | `io.github.growthbook/growthbook-mcp` | not listed |
| Last release | 2026-10-06 | 2026-10-06 |
| Terms last updated | 2025-06-19 | no date given |
| Privacy policy last updated | 2026-06-08 | couldn't be read |
| Customer content may train models | yes | yes |
| 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 | 8.5k stars, 1.3M npm/wk, 433k PyPI/wk | 213 npm/wk |

## Verdicts

**GrowthBook.** GrowthBook Cloud's MCP server has four tools with read and write annotations, OAuth with dynamic client registration, and a 414-operation OpenAPI spec behind it. The free plan needs no card. The API tools pass paths and JSON bodies through without validation, every key is limited to 60 requests a minute, and audit logs are Enterprise only.

**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.

## Before you call either

### GrowthBook

1. Connect to https://mcp.growthbook.io/mcp and complete OAuth in a browser. Use https://mcp.growthbook.io/mcp/api for the two API tools alone
2. Call `growthbook_list_skills` and `growthbook_read_skill` before writing. The API tools don't validate payloads, so use the paths the skill names
3. Stay under 60 requests a minute per key. On 429 wait for the `RateLimit-Reset` seconds before retrying
4. List calls return 10 items by default. Pass `limit` up to 100 and `offset` to page
5. A 422 is a soft warning. Resubmit with `?ignoreWarnings=true` only after reading the message

### 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

## Questions

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

GrowthBook scores 70.1 (BB) on agent readiness against Heap's 53 (D), and leads in every scored category.

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

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

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

Yes. GrowthBook has a hosted endpoint at https://mcp.growthbook.io/mcp and Heap at https://heapanalytics.com.

### Are GrowthBook and Heap open source?

GrowthBook is open source (MIT for the core and for the MCP server. Three enterprise directories in the main repository are under GrowthBook's enterprise licence. GrowthBook Cloud is a hosted service under the Customer Agreement). No open-source release is listed for Heap.


## For agents

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

## Other comparisons with GrowthBook or Heap

- [Amplitude vs GrowthBook](https://www.anchorterminal.com/compare/amplitude-vs-growthbook.md)
- [Fullstory vs GrowthBook](https://www.anchorterminal.com/compare/fullstory-vs-growthbook.md)
- [GrowthBook vs Pendo](https://www.anchorterminal.com/compare/growthbook-vs-pendo.md)
- [Amplitude vs Heap](https://www.anchorterminal.com/compare/amplitude-vs-heap.md)
- [Fullstory vs Heap](https://www.anchorterminal.com/compare/fullstory-vs-heap.md)
- [Heap vs Mixpanel](https://www.anchorterminal.com/compare/heap-vs-mixpanel.md)
- [Heap vs Pendo](https://www.anchorterminal.com/compare/heap-vs-pendo.md)
- [Heap vs PostHog](https://www.anchorterminal.com/compare/heap-vs-posthog.md)
- [Heap vs Statsig](https://www.anchorterminal.com/compare/heap-vs-statsig.md)
- [GrowthBook vs LaunchDarkly](https://www.anchorterminal.com/compare/growthbook-vs-launchdarkly.md)
- [GrowthBook vs Mixpanel](https://www.anchorterminal.com/compare/growthbook-vs-mixpanel.md)
- [GrowthBook vs Optimizely Experimentation](https://www.anchorterminal.com/compare/growthbook-vs-optimizely.md)
- [GrowthBook vs PostHog](https://www.anchorterminal.com/compare/growthbook-vs-posthog.md)
- [GrowthBook vs Statsig](https://www.anchorterminal.com/compare/growthbook-vs-statsig.md)