Whisperr vs Churnkey
Churnkey and Whisperr act at different moments. Churnkey works at the cancel button and the failed charge: cancel flows with offers, failed-payment recovery and return campaigns, on web billing systems such as Stripe, Chargebee and Paddle. Whisperr works earlier and in the app: it spots users drifting from your product, decides who needs a message, writes it, and sends it by push or email through your own providers.
At a glance
| Whisperr | Churnkey | |
|---|---|---|
| What it is | A retention engine that decides, writes and sends messages per user | Cancel flows, failed-payment recovery and win-back for subscriptions |
| When it acts | While users drift, and after auto-renew is turned off while they still have access | At the cancel button, after a failed charge, and after users leave |
| What users see | A push or email written for them | A cancel flow with offers, pauses and surveys; payment and return campaigns |
| Billing systems | RevenueCat, Superwall, Adapty, and your own backend | Stripe, Chargebee, Maxio, Paddle and Braintree |
| Proof | A 10% holdout with retention and revenue kept and a 95% confidence interval | A/B tests on cancel flows from the Core plan up |
| Pricing | Free up to 1,000 users; paid from $49 a month; 30-day free trial | Starter $250 a month billed yearly; higher tiers by churn volume; 14-day trial |
What Churnkey does well
Churnkey focuses on the moments where revenue is most directly at risk. Its cancel flows present offers, pauses and exit surveys when a customer tries to cancel, segmented by risk, usage and language, with A/B testing. Its failed-payment tools add smart retries and email, SMS and in-app campaigns, and return campaigns invite former customers back. A Customer Health score sorts customers by risk. It’s built around web billing, with Stripe as its native integration.
How Whisperr works differently
Whisperr works before the cancel button. It reads each user’s product events and spots the ones whose activity is falling, then decides whether a message would help and writes one for that user. It sends by push or email through your own providers (OneSignal, Firebase Cloud Messaging, Apple Push, Expo, Postmark, Resend or SendGrid).
It also covers subscription moments from RevenueCat, Superwall or Adapty: a trial about to end, a failed payment, and a user who turned off auto-renew but still has access. A 10% holdout shows how many users the messages kept, once each group has 200 users.
Which should you choose?
Choose Churnkey if your subscriptions run on web billing such as Stripe, Chargebee or Paddle, and your biggest losses happen at the cancel button or from failed cards.
Choose Whisperr if your subscriptions run through the App Store and Google Play via RevenueCat, Superwall or Adapty, or if users quietly drift away long before they reach a cancel button.
Web subscription businesses can use both: Churnkey at the cancel moment, Whisperr in the weeks before it.
Pricing
Churnkey’s Starter plan is $250 a month billed yearly ($300 billed monthly). Core and Intelligence are priced by monthly churn volume, Enterprise is custom, and there’s a 14-day trial. Whisperr is free up to 1,000 users; Solo is $49 a month for 5,000 users, and every paid plan starts with a 30-day free trial. Full pricing.
FAQ
Which billing systems does Churnkey support?
Churnkey's pricing page lists Stripe, Chargebee, Maxio, Paddle and Braintree, and its homepage also names Recurly. Whisperr reads subscription events from RevenueCat, Superwall and Adapty, which sit on top of the App Store and Google Play, and from your own backend.
How much does Churnkey cost compared with Whisperr?
Churnkey's Starter plan is $250 a month billed yearly or $300 billed monthly, with higher tiers priced by monthly churn volume, and a 14-day trial. Whisperr is free up to 1,000 users and its paid plans start at $49 a month, each with a 30-day free trial.
Does Whisperr have cancel flows?
No. Whisperr doesn't change your cancel screen. It messages users earlier, while they're drifting, and messages users who turned off auto-renew but still have access. For web subscriptions, a cancel-flow tool like Churnkey covers the cancel moment itself.
Do both handle failed payments?
Yes, in different ways. Churnkey retries payments and runs email, SMS and in-app campaigns for failed charges on the billing systems it supports. Whisperr sends a reminder to update payment details by push or email during the store's retry period, with no discount, and stops when the payment recovers.
Sources
Facts about other products come from their own websites and docs, checked on . Prices and plans change, so confirm them with the vendor.
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