How to choose

What is the best cancellation flow software for a SaaS company?
It depends on what's already true of your stack. If you bill on Stripe and want something self-serve — sign up, connect Stripe, and go live without a sales call — a focused tool like AcornRetain fits. If you need dunning, win-back campaigns, and a cancel flow bundled from one vendor, or you already run your billing through a platform like Chargebee, a broader retention platform is the better starting point. There isn't one best answer independent of that.
Do I need a full retention platform, or just a cancel flow?
A full platform earns its price if you also want failed-payment recovery and win-back campaigns running alongside the cancel flow. If those are separate problems you have already solved, or have not gotten to yet, a tool that only does the cancel-flow slice — the survey and the retention offer at the moment someone clicks cancel — is a smaller, cheaper decision.
Does cancellation flow software need to match my billing provider?
Yes — the tool has to be able to read and modify the subscription it's trying to save, which means it has to integrate with wherever your billing actually lives. A tool that only supports Stripe, for example, is not evaluable if your subscriptions are billed through Chargebee, Recurly, or Paddle instead.

Still deciding?

The pricing page has the whole commercial story, and the FAQ covers what the product does and does not do. Test mode is unlimited on every plan, so the cheapest way to compare is to build your flow and run it.