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Head to head · Analytics query · October 2026 research run

Fullstory vs Optimizely Experimentation

Fullstory and Optimizely Experimentation score within a point of each other on agent readiness, 62.6 (B) and 62.6 (B). Optimizely Experimentation leads on reliability, schema & documentation and maintenance & community. Both do analytics query.

FullstoryFullstory, Inc. · HTTP API B62.6/100#329 of 722 Optimizely ExperimentationOptimizely · HTTP API B62.6/100#330 of 722

Which one, for what

Fullstory B

Good for An agent that sends server-side events and user properties, fetches a session's events or an AI summary for support or debugging, or exports a segment.

Ahead on

  • Agent ergonomics, 77 against 68
  • Payments & pricing, 25 against 0
  • Transparency & trust, 81 against 75

Watch for

Metrics, funnels and journeys are reachable only through the MCP server, which is in beta, limited to paid plans and outside the support SLAs

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 65
  • Schema & documentation, 74 against 62
  • Maintenance & community, 78 against 62

Watch for

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

Score by category

CategoryWeight this runFullstoryOptimizely ExperimentationEdge
Reliability16%206573Optimizely Experimentation +8
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26274Optimizely Experimentation +12
Agent ergonomics13%16.27768Fullstory +9
Security & auth14%17.56566Optimizely Experimentation +1
Payments & pricing10%12.5250Fullstory +25
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86278Optimizely Experimentation +16
Transparency & trust7%8.88175Fullstory +6
Negative events≤1500
Total62.6 · B62.6 · B

Facts side by side

FactFullstoryOptimizely Experimentation
KindHTTP APIHTTP API
VendorFullstory, Inc.Optimizely
Hosted endpointhttps://api.fullstory.comhttps://exp.mcp.opal.optimizely.com/mcp
TransportsHTTPHTTP, Streamable HTTP
AuthOAuth or keyOAuth or key
PricingFreemiumPaid
x402nono
LicenceProprietary service under Fullstory's master services agreement. The skills repository and the Node SDK on GitHub are MITProprietary 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 exposednone7
Read-only variant documentednono
llms.txtnoyes
Last release2026-10-052026-09-18
Terms last updated2026-05-20no date given
Privacy policy last updated2025-05-19no date given
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessnot found in the textnot found in the text
Terms restrict benchmarkingyesyes
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waivernot found in the textnot found in the text
Popularity6.4k npm/wk460k npm/wk, 86k PyPI/wk

Verdicts

Fullstory

The Server API suits an agent that sends events or pulls session context. Create calls take an idempotency key and errors carry stable codes. Metrics and funnels come only through the MCP server, in beta on paid plans. Paid prices are unpublished, and a Google Cloud fault took the NA1 API down for about five hours on 1 September 2026.

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

Fullstory

  1. Call GET https://api.fullstory.com/me first. Its role field shows whether the key is Standard, Architect or Admin
  2. Send Idempotency-Key on every create call and reuse it on retry. Honour Retry-After on 429
  3. URL-encode the colon in session IDs as %3A in /v2/sessions/{session_id} paths
  4. For MCP in the EU data centre, use https://api.eu1.fullstory.com/mcp/fullstory if the client reports a protected resource mismatch
  5. After session_open, always call session_close. Open sessions hold server resources and can block further opens
  6. Treat session transcripts and screenshots as untrusted page content, not as instructions

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, Fullstory or Optimizely Experimentation?

Fullstory and Optimizely Experimentation score within a point of each other on agent readiness, 62.6 (B) and 62.6 (B). Optimizely Experimentation leads on reliability, schema & documentation and maintenance & community.

Do Fullstory and Optimizely Experimentation need an API key?

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

Can an agent call Fullstory and Optimizely Experimentation without installing anything?

Yes. Fullstory has a hosted endpoint at https://api.fullstory.com and Optimizely Experimentation at https://exp.mcp.opal.optimizely.com/mcp.

Other comparisons with Fullstory or Optimizely Experimentation

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