Payments and billing

This small category covers billing tools rather than payment processors, since processors charge per transaction instead of offering a plan with a quota. RevenueCat, Adapty and Qonversion manage in-app subscriptions on iOS and Android; Zoho Subscriptions and Zoho Checkout handle recurring billing and hosted payment pages; Moesif adds usage-based billing for APIs; Commerce Layer and Crystallize are headless commerce backends.

Subscription backends cap by revenue rather than users. RevenueCat is free up to $2.5k of tracked revenue a month, Adapty and Qonversion up to $10k. Past that point paid plans are usually priced as a share of revenue, so compare those rates as well as the ceiling. Zoho Subscriptions stops at 20 customers and Zoho Checkout at 50 payments.

FraudLabs Pro screens 500 transactions a month for card fraud, and ParityVend adjusts prices by visitor country with 7,500 requests a month. Churnkey handles cancellation flows and churn metrics for subscription products. Pricing in this category shifts often, so check the plan page before relying on a limit.