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What is Stella?

Stella is an innovative platform tailored for marketing measurement, offering marketers scientifically sound insights into which advertisements, campaigns, and media channels drive revenue growth. It includes three key features: Incrementality Testing, Always-On Incrementality, and Media Mix Modeling (MMM). With Incrementality Testing, Stella performs geo-holdout studies, commonly referred to as inverse holdouts, to determine performance variations between test and control regions, thereby isolating the direct effects of advertisements instead of relying solely on attribution techniques. This tool streamlines intricate statistical concepts like causal inference and confidence intervals, enabling users to grasp potential outcomes independent of any specific campaign, and revealing the true "lift" generated by each ad. Additionally, the Media Mix Modeling component utilizes a distinctive Bayesian method to analyze past marketing budgets alongside external factors, such as seasonality and promotional events, to accurately evaluate each channel's contribution to total sales. By employing these sophisticated strategies, Stella not only enhances the decision-making process for marketers but also ensures that the data they rely on is both precise and actionable. Ultimately, the platform stands as a vital resource for marketers seeking to optimize their advertising efforts effectively.

What is Spillmark?

Spillmark is a specialized online analytics and experimentation tool tailored for Amazon sellers who use Meta ads. This innovative platform seamlessly consolidates data from Amazon Seller Central, Amazon Ads, Meta, and optionally Shopify, enabling users to evaluate their sales performance, expenses, fees, advertising costs, and the overall profitability of their channels through a variety of connections and report imports. Sellers can implement geographic holdout tests, which involve suspending Meta ads in specific locations, to analyze Amazon sales and gauge the incremental effects of their advertising strategies. The results are provided with confidence intervals and thorough explanations of the methodologies used, along with dashboards, alerts, and documentation of test designs. Importantly, access to linked accounts is strictly read-only, ensuring that no campaigns are altered without the seller's explicit approval. Furthermore, Spillmark includes an MCP server and REST API, facilitating integration with assistants and scripts to improve its functionality. Currently, the platform is testing brand-level measurement and customized recommendations in a private beta phase. Its Starter package allows users to conduct one active holdout test and receive notifications, while the Growth package includes unlimited tests, live account connections when available, and personalized Amazon PPC tests, addressing the dynamic requirements of sellers as they expand their businesses. Through its cutting-edge features and intuitive design, Spillmark is dedicated to refining the marketing approaches of Amazon sellers and enhancing their overall success. This commitment to innovation positions Spillmark as a vital resource in the competitive landscape of online selling.

Media

Media

Integrations Supported

Amazon
Shopify
Google Cloud Platform
Meta AI
Snowflake

Integrations Supported

Amazon
Shopify
Amazon Ads
Amazon Seller Central
Meta Ads
Model Context Protocol (MCP)

API Availability

API Availability

Has API

Pricing Information

$2,000 per month
Free Trial Offered?

Pricing Information

$19/month
Dashboard costs $19/month. Starter costs $49/month for brands spending up to $3,000/month on Meta and includes one active holdout test, an experiment ledger, and alerts. Growth costs $199/month for brands spending over $3,000/month on Meta and includes unlimited holdout tests, live account connections when available, branded Amazon PPC tests, and scored predictions. All plans are billed monthly and can be canceled anytime.
Free Trial Offered?

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

24 Hour Support

Training Options

Documentation Hub
Online Training

Training Options

Documentation Hub

Company Facts

Organization Name

Stella

Company Location

United States

Company Website

www.stellaheystella.com

Company Facts

Organization Name

Spillmark

Date Founded

2026

Company Location

United States

Company Website

spillmark.com

Categories and Features

Categories and Features

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