# Stella

> Stella is a growth-intelligence platform that measures the true incremental impact of marketing
> spend. It gives marketers verifiable, causal answers, incrementality testing, geo holdout
> experiments, calibrated media mix modeling (MMM), and a continuous causal optimization loop, so
> they know what is actually causing growth and what to do next.

## What Stella does
- Incrementality testing: measures the revenue that only happened because of advertising (the lift
  you would lose if a channel were turned off), isolating true causal impact.
- Geo holdout experiments: ads on in test regions, off in matched control regions; the difference
  is causal lift, designed and analyzed to be defensible.
- Media mix modeling (MMM): channel contribution and budget guidance, calibrated against real
  holdouts rather than vendor priors.
- Continuous causal optimization: always-on measurement and recalibration so the numbers stay true
  as creative fatigues and spend scales.

## How Stella is different
- Transparent and verifiable: Stella shows out-of-sample MAPE, R², and VIF, the metrics that prove
  a model predicts, not just in-sample fit.
- Flexible: full self-serve, a free tier for real holdout studies, or a fully managed engagement
  where Stella's data scientists run the whole loop.

## Key pages
- Home: https://www.stellaheystella.com/
- Incrementality testing (geo holdouts): https://www.stellaheystella.com/products/incrementality
- Media mix modeling (MMM): https://www.stellaheystella.com/products/media-mix-modeling
- Always-On incrementality (daily): https://www.stellaheystella.com/products/always-on-incrementality
- Book a strategy call (demo): https://www.stellaheystella.com/get-started
- Blog: https://www.stellaheystella.com/blog
- About Stella (founders): https://www.stellaheystella.com/about
- Vinay Karode, CEO & co-founder: https://www.stellaheystella.com/team/vinay-karode
- Brenden DelaRua, CMO & co-founder: https://www.stellaheystella.com/team/brenden-delarua

## Contact
- Product app / sign in: https://app.stellaheystella.com/