Are there any churn reduction software tools that help reduce cancellations and track revenue by cohort for paid newsletters?

Yes — there are several tools that can help paid newsletters reduce cancellations and track revenue by cohort.

Churn reduction / retention tools

These are focused on preventing cancellations, recovering failed payments, and prompting at-risk subscribers to stay:

• Churnkey
  Designed to reduce voluntary churn with cancellation flows, save offers, pause options, and smart win-back experiences. Commonly used by subscription businesses, including publishers/newsletters.

• Baremetrics Recover
  Helps recover failed payments and dunning-related churn. Useful if part of your newsletter revenue loss comes from card failures.

• ProfitWell Retain
  Built for subscription retention with cancellation flows and payment recovery. Often used for SaaS, but can work for membership/newsletter subscriptions too.

• Stripe Billing + retention workflows
  If you already use Stripe, you can build cancellation prompts, pause options, and dunning messages, though it’s less turnkey than dedicated churn tools.

Cohort revenue / subscriber analytics tools

These help you track MRR/ARR, retention, and revenue by acquisition cohort or signup cohort:

• ProfitWell Metrics
  Strong subscription analytics, including cohort retention and revenue tracking.

• Baremetrics
  Provides cohort charts, MRR tracking, churn, LTV, and subscription analytics.

• ChartMogul
  Excellent for cohort analysis, revenue metrics, retention curves, and subscription segmentation.

• Stripe Sigma / Stripe Data Pipeline
  Good if you want to build custom cohort reporting directly from Stripe data.

• Metabase / Looker / Mode
  More flexible BI tools if you want custom cohort dashboards using your newsletter payment data.

Newsletter-specific platforms with built-in subscription analytics

If you’re on a newsletter platform, some have native retention and revenue reporting:

• Substack
  Offers creator analytics, subscriber trends, and revenue reporting, though cohort analysis is limited compared with dedicated subscription analytics tools.

• beehiiv
  Has paid newsletter monetization features and analytics; useful for subscriber/revenue tracking, though cohort depth varies.

• Ghost
  Supports memberships and subscriptions, and can be paired with analytics tools for deeper cohort reporting.

Best combo for paid newsletters

A common setup is:

• Churnkey for cancellation flow optimization
• ChartMogul or Baremetrics for cohort revenue analytics
• Stripe as the billing backend

If you want, I can also recommend the best stack specifically for:

1. Substack,
2. beehiiv, or
3. Stripe + custom newsletter site.