A/B Test Sample Size Calculator MCP
Exact A/B test sample size, duration, z-test, chi-square, Fisher-Freeman-Halton and peeking risk.
What it does
A/B Test Sample Size Calculator MCP is an MCP server, a connector that lets an AI assistant use it as a tool. It is hosted: an assistant connects to it over the internet, nothing to install.
No capability identified yet from its description.
Facts come from the Official MCP Registry, as declared by the publisher. Capabilities are matched automatically (low confidence). None of this is a test of the tool.
At a glance
How to connect
As declared in the Official MCP Registry · hosted endpoint tested by Electra Index 3h ago (live check)Hosted endpoint
https://ab-test-sample-size-calculator-mcp.lipmichal.workers.dev/mcpstreamable-http
In Claude Code: claude mcp add --transport http a-b-test-sample-size-calculator-mcp https://ab-test-sample-size-calculator-mcp.lipmichal.workers.dev/mcp
MCP settings (Claude Desktop, Cursor and other MCP clients)
{
"mcpServers": {
"a-b-test-sample-size-calculator-mcp": {
"url": "https://ab-test-sample-size-calculator-mcp.lipmichal.workers.dev/mcp"
}
}
}Live check
Electra Index connected to the hosted endpoint 3h agoONLINE A/B Test Sample Size Calculator MCP answered an MCP connection on 02 Nov 2026 and introduced itself as ab-test-sample-size-calculator-mcp 1.0.0 (MCP protocol 2025-06-18).
5 tools offered to AI assistants
calculate_sample_size· Exact sample size per variant for an A/B test on a conversion rate (two independent proportions): baseline rate, minimum detectable effect (relative or absolute), alpha, power, one or two-sided, several variants with optional Bonferroni, anestimate_test_duration· How many days an A/B test must run: from a known sample size per variant, or from baseline rate and MDE (computed as in calculate_sample_size), plus daily visitors and the share of traffic in the test. Returns exact days and the recommendedtest_ab_significance· Is an A/B test result statistically significant? From visitors and conversions per group: two-proportion z-test (pooled), one or two-sided p-value, Wald confidence interval for the difference, relative lift, Pearson chi-square with and withfisher_exact_test· Exact p-value for a contingency table of counts. 2x2: Fisher exact test (two-sided, greater or less, as R fisher.test). Larger r x c tables (for example 3 variants x converted/not, or 4 x 4 survey tables): Fisher-Freeman-Halton exact test bcheck_peeking_risk· What peeking does to an A/B test: the real false positive rate if you check a fixed-horizon test K times and stop at the first p < alpha (for example about 14% at 5 looks with alpha 0.05), and the Pocock and O'Brien-Fleming group sequential
What "online" means: the server answered an MCP connection at the time of the check. It is not a guarantee of security, quality or continuous uptime. How we test: we open an MCP session and ask for the tool list, as an AI assistant would. We never run a tool and never send a key. Checked every few days. Method
Is this your server? Monitoring Pro: a check every 30 minutes and an email within the hour when it stops answering. Launch offer: $39.99 once, for life.
Facts & evidence
Each fact shows where it was seen and when.| Fact | Value | Evidence | Source | Last confirmed |
|---|---|---|---|---|
| Hosted endpoint | https://ab-test-sample-size-calculator-mcp.lipmichal.workers.dev/mcp | DECLARED | SRC-001 Official MCP Registry | 1h ago |
| Local install (package) | no | DECLARED | SRC-001 Official MCP Registry | 1h ago |
| Remote access (hosted) | yes | DECLARED | SRC-001 Official MCP Registry | 1h ago |
| Website | https://abwex.com/tools/sample-size-calculator.html | DECLARED | SRC-001 Official MCP Registry | 1h ago |
| Repository | https://github.com/theluckystrike/ab-test-sample-size-calculator-mcp | DECLARED | SRC-001 Official MCP Registry | 1h ago |
| Registry status | active | DECLARED | SRC-001 Official MCP Registry | 1h ago |
| Version | 1.0.0 | DECLARED | SRC-001 Official MCP Registry | 1h ago |
| MCP server | yes | DECLARED | SRC-001 Official MCP Registry | 1h ago |
Change history
- NEW02 Nov 2026first seen in the index
Is this page accurate?
Flag it and our robot re-checks the official source. Reports never change a score.Is A/B Test Sample Size Calculator MCP still online?
Free alerts · no account▲ 0Do you run A/B Test Sample Size Calculator MCP? Know when it stops answering
For publishers · optionalIts hosted endpoint can be monitored. Monitoring Pro connects every 30 minutes like an AI assistant, emails you within the hour when it stops answering, keeps a 90-day availability history and adds your answer rate to your badge.
Monitoring never changes a score or a rank.
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How do I connect A/B Test Sample Size Calculator MCP?
Use the hosted endpoint https://ab-test-sample-size-calculator-mcp.lipmichal.workers.dev/mcp in your assistant's MCP settings. The exact settings are in "How to connect" above, as declared in the Official MCP Registry.
What tools does A/B Test Sample Size Calculator MCP offer?
When Electra Index connected on 02 Nov 2026, it listed 5 tools: calculate_sample_size, estimate_test_duration, test_ab_significance, fisher_exact_test, check_peeking_risk. The full list is in "Live check" above.
Is A/B Test Sample Size Calculator MCP online?
Yes. Its hosted endpoint answered an MCP connection from Electra Index 3h ago.