ConvertKit ◆
ConvertKit (now Kit) is an email-first platform that automates email marketing, newsletter growth, and digital product sales for creators.

SparkLoop (Email Marketing): SparkLoop is a newsletter growth platform for referral programs, paid recommendations, and partner programs. Pricing: from Free · from $2,000/year. (data verified July 2026)
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SparkLoop is a newsletter growth platform that helps creators and media brands grow their subscriber base and monetize their audience through recommendations and referral programs. It solves the problem of slow, costly audience growth by turning readers into promoters and enabling paid partnerships with other newsletters.
SparkLoop is built for newsletter creators, independent writers, content marketers, and media brands who want organic growth through word-of-mouth. It is not for businesses looking to grow a product-driven email list without a newsletter focus.
Newsletter operators use SparkLoop to offset ad costs with paid recommendations, grow 2-3x faster with free cross-recommendations, or set up referral programs (like those used by The Hustle and Morning Brew) that boost growth by 20-200%. Integrates in two clicks with 25+ email platforms including ConvertKit, Mailchimp, and Substack.
Editorial score from our review methodology — not user ratings.
SparkLoop pricing: Free · from $2,000/year. Billing model: Freemium.
Includes Paid Recommendations, Partner Programs, and Free Recommendations at no cost. Start using SparkLoop immediately with 2-click integrations.
$2,000/year. Adds Newsletter Referral Programs with reward fulfillment, referral hub, and analytics. Available as an upgrade to the free plan.
No long-term contract required; start for free.
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