ProsperStack and Churnkey both run the full retention lifecycle. Churnkey goes deeper — ML-driven offers and payment recovery trained on 200M+ subscriptions, cancel reasons mapped to revenue, and Premier Stripe-native depth.
Read a real, recent Churnkey review...
“ Churnkey has been a lifesaver for improving customer retention at Relume. Its customizable Cancel Flows, actionable insights, and seamless integration with platforms like Stripe make it incredibly effective. Within months, we saw a noticeable drop in churn rates, directly boosting revenue. The support team is excellent and always quick to help. ”
ProsperStack covers the subscription lifecycle — cancellation flows, win-backs, and revenue recovery. So does Churnkey. The difference is how far each one goes.
On the voluntary side, both run cancel flows: targeted offers, pauses, plan changes, and A/B testing. ProsperStack does this well. The separation starts in the depth of the save — Churnkey's Adaptive Offers use ML to pick the offer most likely to work for each individual customer, and Feedback AI maps every cancel reason to the MRR behind it.
On the involuntary side, both recover failed payments. Churnkey's recovery is built on 200M+ subscriptions of payment data: Precision Retries that learn the best moment to re-attempt each decline, segmentation across 60+ decline codes, and an in-app failed-payment wall. Recovery you tune, not just switch on.
Underneath it sits the data and the Stripe relationship. Churnkey is a Premier Stripe partner, and its models are trained on one of the largest retention datasets in the category — the part a cancel-flow-first platform can't easily replicate.
Both tools will reduce churn. Churnkey is built to keep compounding it — every retry, offer, and reason feeding the next decision.
Churnkey saves 54% of customers who intend to cancel — an average across all customers, not a cherry-picked best case. ProsperStack cites up to a 39% reduction at the point of cancellation; Churnkey tracks its save rate as a living number it keeps improving for every customer.
At Churnkey, 70% of all involuntary churn we detected was recovered — an average across our entire customer base, not a cherry-picked best case. ProsperStack recovers failed payments too; Churnkey's edge is depth: Precision Retries that learn the best moment to re-attempt each decline, segmentation across 60+ decline codes, and an in-app failed-payment wall — all trained on 200M+ subscriptions.
Churnkey offers human support, recurring strategy calls, and an ML-based Account Agent that finds opportunities humans can't. The difference is that the product performs without hand-holding — retention runs on automation, not on a services team filling in for what the software doesn't do.
Every cancelled subscription is a negotiation you lost. Adaptive Offers uses AI to find the perfect discount for each customer, maximizing saves while protecting your margins. Our Precision Retries uses a combination of rule-based and self-improving logic to recover passive churn.
Churnkey gathers so much data at these delicate customer touchpoints that can change the trajectory of your business for the better. The only problem? Making sense of it. That's why our AI gets to work for you: categorizing everything for your teams and mapping it to revenue lost.
Connect your payment provider to break down churn across revenue vs. logo churn, cohort analysis, new vs. old churn, and more. Churn Metrics is available free in Churnkey — a granular, billing-level view of your churn that not every retention platform includes as a standalone.
Churnkey handles retention for modern, customer-obsessed teams...
The details compound. This is what that looks like in practice.
Your billing data is sensitive and delicate. Churnkey is GDPR and SOC-2 Type II compliant — independently audited assurance that your data is handled correctly. Before you connect your payment provider to any retention tool, it's worth confirming it carries the same certifications.
A cancel flow is the visible part of retention; the depth is in everything around it. Dunning emails filtered by 60+ decline codes. Retries timed to a customer's local timezone. A/B tests tied to MRR recovered. ProsperStack is built for the cancel moment — Churnkey takes every retention surface that far.
We design our products in a modular way so you can build something that's unique-to-you — cancel flows, payment recovery, reactivations, and adaptive offers that compose around your billing instead of a fixed template. Retention that fits your business, not a one-size-fits-all script.
Modern features like automatic compliance, localization, custom attributes, and discounting future payments are table stakes in Churnkey — the depth that turns a retention tool into recovered revenue.
ProsperStack publishes pricing too — but it meters by session, starting at $200/mo with $75 overages per 50 extra sessions, and gates its AI offer optimization to the $750/mo plan. Churnkey prices around the revenue you save, so scaling your retention doesn't mean paying penalties for volume.
Churnkey is a certified premium Stripe partner. Stripe recommends us to their customers and runs co-marketing campaigns alongside us. We go deep with Stripe, Chargebee, Paddle, and a few others.
Common questions
What teams ask when comparing Churnkey to ProsperStack.
The Churnkey team has built and delivered on every promise made. This will be a complete game changer for our business. 10/10 recommend.
Senior Director of Core Subscription, Buildertrend
Best-in-class product-led teams choose Churnkey because it was built to work. On average, companies save 20-40% of the revenue they would otherwise lose to churn.
