Churnkey vs Churn Buster vs ReviveBy: Dunning Tool Pricing for Small SaaS

If you're comparing Churnkey vs Churn Buster vs ReviveBy for your SaaS dunning tool, the right choice depends almost entirely on your MRR and what you actually need. Most comparison posts are written by one of the competitors. This one is too (ReviveBy), but we'll be upfront about tradeoffs and where the other tools genuinely win.

Here's what each tool costs, what it does, and where it makes sense for SaaS companies in the $5K to $30K MRR range.

The pricing landscape

Dunning tool pricing varies wildly. Some charge flat monthly fees. Others scale with your MRR or take a percentage of recovered revenue. At small scale, these differences compound fast.

Churnkey starts at $250/month on their Starter plan. Their Core plan runs $700/month, and Intelligence is $825/month. All plans are billed annually with a 14-day free trial on Starter and Core. Churnkey is a full retention platform: cancel flows, payment recovery, and reactivation campaigns bundled together.

Churn Buster starts at $249/month for most plans, though they offer a limited tier around $99/month for smaller businesses. Pricing scales with your subscription volume. Churn Buster focuses specifically on dunning and cancel flows, with analytics included across all tiers.

ReviveBy starts at $29/month (Starter) or $79/month (Growth). Flat monthly fee, no percentage of recovered revenue, no MRR-based scaling. Annual billing knocks off two months.

The gap is significant. At $250+/month, Churnkey and Churn Buster cost $3,000+ per year minimum. ReviveBy's Starter plan costs $348/year. Even the Growth plan is $948/year.

What each tool actually does

These three tools are not identical products at different price points. They target different problems with different scopes.

Churnkey is the broadest platform. Beyond dunning emails, it offers personalized cancel flows that dynamically adapt based on customer segments, payment walls that block product access until cards are updated, omnichannel recovery (email, SMS, in-app), and reactivation campaigns for already-churned subscribers. They report a 72% average payment recovery rate across their customer base. If you're losing customers to both voluntary and involuntary churn and want a single platform to address both, Churnkey is the most comprehensive option.

Churn Buster sits in the middle. It covers dunning campaigns and cancellation flows with strong analytics. It's been in the dunning space longer than most competitors and has a mature product. The email sequences are well-tested, and their retry logic integrates directly with Stripe. For teams that want both dunning and cancel flow management without the full retention suite, Churn Buster is solid.

ReviveBy is narrowly focused on one thing: recovering failed Stripe payments through automated email sequences. It detects failures via Stripe webhooks in under a second, sends branded recovery emails with one-click card update links, and tracks recovery in a real-time dashboard. The Growth plan adds editable templates, up to 5 Stripe accounts, a 5-email dunning sequence, and weekly recovery reports. There are no cancel flows, no SMS, no reactivation campaigns.

Where each tool wins

Churnkey wins when you're above $30K MRR, losing meaningful revenue to both voluntary and involuntary churn, and need a unified retention platform. The $250/month price tag becomes easier to justify when your MRR can absorb it and you're getting cancel flows plus payment recovery in one tool. Their omnichannel approach (SMS, in-app, email) is a genuine advantage for products with high engagement where customers are regularly inside the app.

Churn Buster wins when you want a proven dunning tool with cancel flow management, you're at $15K-$50K MRR, and you value a platform that's been refining its approach for years. Churn Buster has deep Stripe integration and a track record. The higher price is justified if you're using both the dunning and cancellation features.

ReviveBy wins when you're a small SaaS between $5K and $30K MRR, failed payments are your primary churn problem, and you need a tool that does one thing well at a price that doesn't eat your margins. If you're a solo founder or small team and involuntary churn is your main leak, paying $250+/month for features you won't use (cancel flows, reactivation campaigns) doesn't make sense.

The math at different MRR levels

Let's look at what each tool costs as a percentage of MRR:

At $5K MRR, Churnkey's $250/month is 5% of your revenue. Churn Buster at $249/month is just under 5%. ReviveBy at $29/month is 0.58%. When a dunning tool costs 5% of revenue, it needs to recover at least that much just to break even. That's a tight margin.

At $10K MRR, Churnkey and Churn Buster are 2.5% of revenue. ReviveBy is 0.29% on Starter or 0.79% on Growth. More reasonable, but you're still paying 3-4x more for the premium tools.

At $20K MRR, the premium tools drop to about 1.25% of revenue. At this level, the cost becomes much more justifiable, especially if you're using their full feature set.

At $50K MRR, all three tools represent less than 1% of revenue, and the price difference matters less than the feature set. This is where Churnkey and Churn Buster's broader capabilities start to clearly pull ahead in value.

Features that matter at small scale

When you're under $30K MRR, some features matter more than others for failed payment recovery specifically.

Webhook detection speed matters because faster detection means the recovery email lands while the failed charge is still fresh. All three tools handle this well.

Email deliverability matters because recovery emails that hit spam folders don't recover anything. Churn Buster has years of sender reputation built up. ReviveBy uses SendGrid with custom sending domains. Churnkey handles deliverability through their platform.

Stripe Customer Portal integration matters because it lets customers update their card through Stripe's own secure flow. ReviveBy uses this directly. Other tools have their own card update flows, which can be smoother but add complexity.

Multi-account support matters if you run multiple SaaS products. ReviveBy's Growth plan supports 5 Stripe accounts at $79/month. Churnkey and Churn Buster handle this but at their higher price points.

What we'd tell you honestly

If your SaaS is under $10K MRR and failed payments are your biggest churn problem, start with ReviveBy. The math doesn't work for a $250/month tool at that scale.

If you're between $10K and $30K MRR and you're also losing customers who actively cancel (not just payment failures), look seriously at Churn Buster. The cancel flow features could be worth the higher price.

If you're above $30K MRR with a complex retention problem spanning voluntary churn, involuntary churn, and win-back campaigns, Churnkey's comprehensive platform makes the most sense.

The worst outcome is paying for features you don't need and can't use yet. Every dollar spent on tools at small scale is a dollar that could go toward building the product. Pick the tool that solves your actual problem at your actual scale, and upgrade when you outgrow it.