# Trial Conversion Cohort Window Check

Keep trial-start cohorts and conversion windows explicit when comparing subscription conversion rates.

## Scope
Preparation and review only. No account action or professional decision.

## Inputs
This is a custom cohort review under the supplied policy, not a claim to reproduce Stripe's native 30-day rolling conversion metric. Trial-start IDs/dates; conversions/dates; observation cutoff; eligibility policy; cohort definitions; account and currency context.

## Workflow
1. Group by trial start rather than conversion date unless the supplied metric says otherwise.
2. Record the allowed window and whether every trial had time to complete it.
3. Separate matured, converted, still-observing and ineligible trials.
4. Calculate rates only under the supplied denominator policy; do not label incomplete cohorts failures.

## Output contract
cohort | window | eligible | matured | converted | observing | rate_basis | hold

## Fictional acceptance test
Fictional 10 eligible matured trials and 4 conversions yield 40%. Another 3 newly started trials still observing are not added to that denominator. Different windows remain incomparable.

## Review gates
Keep original values, source IDs and version dates. Unknown facts stay held. Use qualified review for hiring, legal and accounting conclusions. No send, share, sign-in, scheduling, ledger change or payment. Fictional contract review is not a live account compatibility test.

## Method source
https://docs.stripe.com/data/analytics/supported-metrics

Checked October 8, 2026. Oct8 live GSC through Oct5: marketing copilot 37 impressions, Planable/Claude 33 and Planable/ChatGPT 23, campaign brief 12 and reports 11. Marketing/social topics follow these parent-query leads; other professions follow method-source workflow needs, not exact query measurements. Exact monthly volume is unmeasured.