# Countly vs Optimizely Experimentation

> Optimizely Experimentation scores 62.6 (B) on agent readiness against Countly's 54.8 (C), and leads in 4 of 7 scored categories. Countly leads on payments & pricing. Both do analytics query. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/countly-vs-optimizely
- Markdown: https://www.anchorterminal.com/compare/countly-vs-optimizely.md (~2,500 tokens)
- Slim: https://www.anchorterminal.com/compare/countly-vs-optimizely.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/countly-vs-optimizely.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: 2026-10-09

Optimizely Experimentation scores 62.6 (B) on agent readiness against Countly's 54.8 (C), and leads in 4 of 7 scored categories. Countly leads on payments & pricing. Both do analytics query.

- Countly: grade C, 54.8/100, rank #607 of 842. Markdown https://www.anchorterminal.com/tools/countly.md · JSON https://www.anchorterminal.com/api/v1/tools/countly.json
- Optimizely Experimentation: grade B, 62.6/100, rank #383 of 842. Markdown https://www.anchorterminal.com/tools/optimizely.md · JSON https://www.anchorterminal.com/api/v1/tools/optimizely.json

## Which one, for what

### Countly (C)

Good for: An agent whose owner runs Countly on its own infrastructure or a dedicated Flex server and wants analytics, crash and remote-config data through MCP with per-category permissions.

Ahead on:
- Payments & pricing, 17 against 0

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

Watch for: No public status page or incident history was found for Flex servers or for mcp.count.ly

### Optimizely Experimentation (B)

Good for: An agent working for an existing Optimizely customer that lists and creates flags, experiments and audiences, reads experiment results and writes SDK integration code.

Ahead on:
- Reliability, 73 against 28
- Transparency & trust, 75 against 70

Watch for: No price is published. The plans page says every plan is individually packaged and leads to a demo request


## Score by category

| Category | Weight | Countly | Optimizely Experimentation | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 28 | 73 | Optimizely Experimentation +45 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 75 | 74 | Countly +1 |
| Agent ergonomics | 13% (16.2 this run) | 66 | 68 | Optimizely Experimentation +2 |
| Security & auth | 14% (17.5 this run) | 63 | 66 | Optimizely Experimentation +3 |
| Payments & pricing | 10% (12.5 this run) | 17 | 0 | Countly +17 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 80 | 78 | Countly +2 |
| Transparency & trust | 7% (8.8 this run) | 70 | 75 | Optimizely Experimentation +5 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **54.8 · C** | **62.6 · B** | |

## Facts side by side

| Fact | Countly | Optimizely Experimentation |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Countly Ltd | Optimizely |
| Hosted endpoint | `https://mcp.count.ly/mcp` | `https://exp.mcp.opal.optimizely.com/mcp` |
| Transports | HTTP, stdio, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | API key | OAuth or key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | Countly Lite is AGPL-3.0 with added branding terms under Section 7. Enterprise plugins are proprietary. Flex is a hosted service under Countly's terms. The MCP server is MIT | Proprietary hosted service under Optimizely's Online Software Subscription Agreement and its API, SDK and MCP terms. The Feature Experimentation SDKs on GitHub are Apache 2.0 |
| Tools exposed | 209 | 7 |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| Last release | 2026-10-07 | 2026-09-18 |
| Terms last updated | 2026-09-25 | no date given |
| Privacy policy last updated | 2026-09-25 | no date given |
| 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 | not found in the text | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 28k npm/wk | 460k npm/wk, 86k PyPI/wk |

## Verdicts

**Countly.** Countly suits an agent working against a server its owner already runs. The official MCP server filters its 209 tools by edition, plugin and permission and has per-category read-only settings. No status page, OpenAPI document or published API rate limit was found, and the Flex trial needs a credit card.

**Optimizely Experimentation.** Optimizely Experimentation suits agents working for an existing customer that manage flags and experiments and read results. The hosted MCP server has seven tools behind OAuth and carries the user's permissions, and the main REST API has a public Swagger spec. No price, free plan or trial is published, and no 429 or idempotency guidance was found.

## Before you call either

### Countly

1. Create a dedicated token in the Token Manager, limited to the apps and endpoints the task needs, and send it in the `countly-token` header, not the URL
2. Set `COUNTLY_TOOLS_ALL=R` unless the task needs writes. The token's own permissions still apply and the stricter of the two wins
3. Call `apps_list` first. Most tools need `app_id` or an exact `app_name`
4. Check `get_version` for the detected edition before planning funnel, retention or cohort queries, which need Enterprise plugins
5. Set `ENABLE_ANALYTICS=false` to stop usage reports to stats.count.ly, and prefer the stdio server to mcp.count.ly so the server URL and token stay local

### Optimizely Experimentation

1. Connect to https://exp.mcp.opal.optimizely.com/mcp and complete OAuth in a browser. The session is time-limited, so expect to sign in again
2. Call `exp_get_schemas` before `exp_execute_query`, and `exp_get_entity_templates` before `exp_manage_entity_lifecycle`, to learn the fields each entity needs
3. Confirm the project and environment with the user before any create or update. Changes go to live Optimizely data
4. Use the Visual Editor for Web Experimentation variation code. The MCP server does not write custom HTML, CSS or JavaScript
5. Over REST, stay under 2 requests a second on `/flags/v1`, 100 a minute on `/v2` and 20 a minute on the results endpoints

## Questions

### Which is better for AI agents, Countly or Optimizely Experimentation?

Optimizely Experimentation scores 62.6 (B) on agent readiness against Countly's 54.8 (C), and leads in 4 of 7 scored categories. Countly leads on payments & pricing.

### Do Countly and Optimizely Experimentation need an API key?

Countly needs an API key. Optimizely Experimentation takes an API key or an OAuth sign-in.

### Can an agent call Countly and Optimizely Experimentation without installing anything?

Yes. Countly has a hosted endpoint at https://mcp.count.ly/mcp and Optimizely Experimentation at https://exp.mcp.opal.optimizely.com/mcp.

### Are Countly and Optimizely Experimentation open source?

Countly is open source (Countly Lite is AGPL-3.0 with added branding terms under Section 7. Enterprise plugins are proprietary. Flex is a hosted service under Countly's terms. The MCP server is MIT). No open-source release is listed for Optimizely Experimentation.


## For agents

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

## Other comparisons with Countly or Optimizely Experimentation

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