# LaunchDarkly vs Statsig

> Statsig scores 72.3 (BB) on agent readiness against LaunchDarkly's 69.2 (B), and leads in 3 of 7 scored categories. LaunchDarkly leads on schema & documentation and transparency & trust. Both do analytics flags. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/launchdarkly-vs-statsig
- Markdown: https://www.anchorterminal.com/compare/launchdarkly-vs-statsig.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/launchdarkly-vs-statsig.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/launchdarkly-vs-statsig.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

Statsig scores 72.3 (BB) on agent readiness against LaunchDarkly's 69.2 (B), and leads in 3 of 7 scored categories. LaunchDarkly leads on schema & documentation and transparency & trust. Both do analytics flags.

- 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
- 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

### 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 82
- Transparency & trust, 80 against 75

Also in its favour:
- Runs on your own machine

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

### 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 64
- Security & auth, 74 against 66

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

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


## Score by category

| Category | Weight | LaunchDarkly | Statsig | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 64 | 79 | Statsig +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 89 | 82 | LaunchDarkly +7 |
| Agent ergonomics | 13% (16.2 this run) | 69 | 71 | Statsig +2 |
| Security & auth | 14% (17.5 this run) | 66 | 74 | Statsig +8 |
| 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) | 82 | 81 | LaunchDarkly +1 |
| Transparency & trust | 7% (8.8 this run) | 80 | 75 | LaunchDarkly +5 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **69.2 · B** | **72.3 · BB** | |

## Facts side by side

| Fact | LaunchDarkly | Statsig |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Catamorphic, Co. (dba LaunchDarkly) | Amplitude, Inc. |
| Hosted endpoint | `https://mcp.launchdarkly.com/mcp/launchdarkly` | `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 | Proprietary service under LaunchDarkly's terms. The local MCP server is MIT and the ldcli CLI is Apache-2.0 | Proprietary hosted service under Statsig's self-service or enterprise terms. The SDKs and the agent skills repository on GitHub are ISC |
| Tools exposed | 141 | 18 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | `com.statsig/statsig-mcp-server` |
| Last release | 2026-10-06 | 2026-09-28 |
| Terms last updated | 2025-09-08 | 2025-08-04 |
| Privacy policy last updated | 2025-04-08 | 2026-08-31 |
| Customer content may train models | not found in the text | 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 | 3.3M npm/wk, 2.2M PyPI/wk | 4.2M npm/wk, 894k PyPI/wk |

## Verdicts

**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.

**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

### 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

### 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, LaunchDarkly or Statsig?

Statsig scores 72.3 (BB) on agent readiness against LaunchDarkly's 69.2 (B), and leads in 3 of 7 scored categories. LaunchDarkly leads on schema & documentation and transparency & trust.

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

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

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

Yes. LaunchDarkly has a hosted endpoint at https://mcp.launchdarkly.com/mcp/launchdarkly and Statsig at https://api.statsig.com/v3/mcp.


## For agents

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

## Other comparisons with LaunchDarkly or Statsig

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