# GrowthBook vs Statsig

> Statsig scores 72.3 (BB) on agent readiness against GrowthBook's 70.1 (BB), and leads in 3 of 7 scored categories. GrowthBook leads on reliability, agent ergonomics and maintenance & community. Both do analytics experiments. Category scores, facts, verdicts and agent notes side…

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- Updated: 2026-10-08

Statsig scores 72.3 (BB) on agent readiness against GrowthBook's 70.1 (BB), and leads in 3 of 7 scored categories. GrowthBook leads on reliability, agent ergonomics and maintenance & community. Both do analytics experiments.

- 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
- 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

### 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 79
- Agent ergonomics, 76 against 71
- Maintenance & community, 89 against 81

Also in its favour:
- Runs on your own machine
- 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

### 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:
- Schema & documentation, 82 against 76
- Security & auth, 74 against 68

Also in its favour:
- No incidents deducted, where GrowthBook loses 3 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 | GrowthBook | Statsig | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 86 | 79 | GrowthBook +7 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 76 | 82 | Statsig +6 |
| Agent ergonomics | 13% (16.2 this run) | 76 | 71 | GrowthBook +5 |
| Security & auth | 14% (17.5 this run) | 68 | 74 | Statsig +6 |
| 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 | GrowthBook +8 |
| Transparency & trust | 7% (8.8 this run) | 74 | 75 | Statsig +1 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **70.1 · BB** | **72.3 · BB** | |

## Facts side by side

| Fact | GrowthBook | Statsig |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | GrowthBook, Inc. | Amplitude, Inc. |
| Hosted endpoint | `https://mcp.growthbook.io/mcp` | `https://api.statsig.com/v3/mcp` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Freemium |
| 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 hosted service under Statsig's self-service or enterprise terms. The SDKs and the agent skills repository on GitHub are ISC |
| Tools exposed | 4 | 18 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | `io.github.growthbook/growthbook-mcp` | `com.statsig/statsig-mcp-server` |
| Last release | 2026-10-06 | 2026-09-28 |
| Terms last updated | 2025-06-19 | 2025-08-04 |
| Privacy policy last updated | 2026-06-08 | 2026-08-31 |
| Customer content may train models | yes | 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 | 8.5k stars, 1.3M npm/wk, 433k PyPI/wk | 4.2M npm/wk, 894k PyPI/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.

**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

### 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

### 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, GrowthBook or Statsig?

Statsig scores 72.3 (BB) on agent readiness against GrowthBook's 70.1 (BB), and leads in 3 of 7 scored categories. GrowthBook leads on reliability, agent ergonomics and maintenance & community.

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

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

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

Yes. GrowthBook has a hosted endpoint at https://mcp.growthbook.io/mcp and Statsig at https://api.statsig.com/v3/mcp.

### Are GrowthBook and Statsig 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 Statsig.


## For agents

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

## Other comparisons with GrowthBook or Statsig

- [Amplitude vs GrowthBook](https://www.anchorterminal.com/compare/amplitude-vs-growthbook.md)
- [Amplitude vs Statsig](https://www.anchorterminal.com/compare/amplitude-vs-statsig.md)
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