CLVTools vs Klaviyo

CLVTools is a free, GPL-3-licensed R package for probabilistic customer attrition modeling when purchases are not governed by contracts. It implements Pareto/NBD, BG/NBD, Gamma/Gompertz/NBD, and Gamma/Gamma models. Using transaction histories with customer IDs and purchase dates, plus prices in its example data, it predicts individual customer behavior such as expected future transactions and the probability that a customer remains active. Forecast horizons can be configured, supporting predictive customer lifetime value work, cohort analysis, and customer segmentation. Time-invariant covariates work across the models, while some models accept time-varying covariates. Extensions include correlated purchase and attrition processes, L2 regularization, and equality constraints for contextual-factor parameters. Stable installation is available from CRAN; a development version uses GitHub and devtools. Linux, macOS, and Windows are supported, though compiling from source requires the external GNU GSL C++ library. Documentation includes a walkthrough, reference manual, and vignettes.

Klaviyo is a web marketing platform for communicating through email, SMS, RCS, mobile push, WhatsApp, and social marketing. Its tools include email automation, audience segmentation, landing pages, A/B testing, and lead capture forms. A helpdesk adds ticket management, customer context, omnichannel support, and AI automation; Klaviyo says its Customer Agent resolves 65% of questions autonomously. The app marketplace offers more than 350 integrations, and developers can build apps and integrations with APIs, webhooks, SDKs, and warehouse syncs. The Free plan costs nothing and includes up to 250 active profiles, 500 email sends per month, $5 of mobile messages per month, and $5 of Composer usage per month. Free access can remain available indefinitely while account limits are maintained, but sending may be paused or restricted if limits are exceeded. Free users receive full email support for the first 60 days. Klaviyo states that it is SOC 2 Type II certified and provides GDPR-related data processing measures and tools, with EU and US data residency. The company was founded in 2012 and is based in Boston, Massachusetts.