# GrowthBook vs LaunchDarkly

> GrowthBook and LaunchDarkly score within a point of each other on agent readiness, 70.1 (BB) and 69.2 (B). LaunchDarkly leads on schema & documentation and transparency & trust. Both do analytics experiments. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/growthbook-vs-launchdarkly
- Markdown: https://www.anchorterminal.com/compare/growthbook-vs-launchdarkly.md (~2,400 tokens)
- Slim: https://www.anchorterminal.com/compare/growthbook-vs-launchdarkly.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/growthbook-vs-launchdarkly.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 and LaunchDarkly score within a point of each other on agent readiness, 70.1 (BB) and 69.2 (B). LaunchDarkly leads on schema & documentation and transparency & trust. 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
- LaunchDarkly: grade B, 69.2/100, rank #165 of 722. Markdown https://www.anchorterminal.com/tools/launchdarkly.md · JSON https://www.anchorterminal.com/api/v1/tools/launchdarkly.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 64
- Agent ergonomics, 76 against 69
- Maintenance & community, 89 against 82

Also in its favour:
- Agent-ready, a grade of BB or better
- 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

### LaunchDarkly (B)

Good for: An agent that creates and targets feature flags, runs rollouts and experiments, reads experiment results and cleans up stale flags.

Ahead on:
- Schema & documentation, 89 against 76
- Transparency & trust, 80 against 74

Also in its favour:
- No incidents deducted, where GrowthBook loses 3 points for them

Watch for: The hosted MCP server lists 141 tools, and no tool filter for it was found in the reviewed documentation


## Score by category

| Category | Weight | GrowthBook | LaunchDarkly | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 86 | 64 | GrowthBook +22 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 76 | 89 | LaunchDarkly +13 |
| Agent ergonomics | 13% (16.2 this run) | 76 | 69 | GrowthBook +7 |
| Security & auth | 14% (17.5 this run) | 68 | 66 | GrowthBook +2 |
| 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 | 82 | GrowthBook +7 |
| Transparency & trust | 7% (8.8 this run) | 74 | 80 | LaunchDarkly +6 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **70.1 · BB** | **69.2 · B** | |

## Facts side by side

| Fact | GrowthBook | LaunchDarkly |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | GrowthBook, Inc. | Catamorphic, Co. (dba LaunchDarkly) |
| Hosted endpoint | `https://mcp.growthbook.io/mcp` | `https://mcp.launchdarkly.com/mcp/launchdarkly` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP, stdio |
| 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 service under LaunchDarkly's terms. The local MCP server is MIT and the ldcli CLI is Apache-2.0 |
| Tools exposed | 4 | 141 |
| 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 | 2025-09-08 |
| Privacy policy last updated | 2026-06-08 | 2025-04-08 |
| 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 | 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 | 3.3M npm/wk, 2.2M 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.

**LaunchDarkly.** LaunchDarkly suits agents that manage feature flags, rollouts and experiments. The hosted MCP server uses OAuth with dynamic client registration and marks its tools read-only or destructive, and the Developer plan is free without a card. The server lists 141 tools, numeric rate limits are unpublished, and the web application was unavailable for over an hour on 10 July 2026.

## 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

### LaunchDarkly

1. Connect to https://mcp.launchdarkly.com/mcp/launchdarkly over streamable HTTP with OAuth. On the EU or federal instance run the local `@launchdarkly/mcp-server` with `--server-url`
2. Authorise with a Reader role or the `reader` scope unless the task writes. A 403 after consent means the member's role lacks access
3. Send `LD-API-Version: 20240415` on every REST call, and `LD-API-Version: beta` for beta resources, which answer 403 without it
4. Read `X-Ratelimit-Global-Remaining`, `X-Ratelimit-Route-Remaining` and `X-Ratelimit-Reset` on each response, and wait `Retry-After` seconds on an IP limit
5. Send `Content-Type: application/json; domain-model=launchdarkly.semanticpatch` for semantic patches, or the body is read as JSON patch and answers 400

## Questions

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

GrowthBook and LaunchDarkly score within a point of each other on agent readiness, 70.1 (BB) and 69.2 (B). LaunchDarkly leads on schema & documentation and transparency & trust.

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

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

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

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

### Are GrowthBook and LaunchDarkly 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 LaunchDarkly.


## For agents

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

## Other comparisons with GrowthBook or LaunchDarkly

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