Cassandra vs Sellforte: unified measurement for retail, or an AI marketing brain that does the work
Sellforte and Cassandra both use a Bayesian marketing mix model checked by experiments. Sellforte unifies MMM, incrementality testing and attribution for retail and ecommerce; Cassandra, an AI marketing brain for growth teams, measures and then does the work, within the rules the team sets.
On method the two are close; the differences are scope and sector. Sellforte describes measurement and optimisation for retail and ecommerce; Cassandra uses what it learns to do the work.
What Cassandra is
- An AI marketing brain for growth teams: it learns what drives growth and does the work.
- Measures with a Bayesian marketing mix model checked by live geo experiments.
- Does the work within the rules the team sets: plans, budgets, ads, creative, reports.
- Approvals: the team decides what waits; every change is recorded.
How this comparison was made
Everything about Sellforte comes from its own public pages, read on 12 October 2026. We have not tested their product. If anything is out of date, write to hello@cassandra.app and we will correct it.
When Sellforte is the better choice
- Retail or ecommerce, one system: Sellforte describes itself as "The Measurement & Optimization OS for Retail and Ecommerce".
- Daily ad-set figures: Sellforte says it delivers incremental ROAS at ad-set level, on a daily cadence.
- An existing attribution tool: Sellforte says it can calibrate an MTA you already use, or provide Sellforte Pixel.
- Promotions: Sellforte says it separates promotion-driven from media-driven sales in each market.
What each one says it is
- Sellforte says it unifies Marketing Mix Modeling, Incrementality Testing and Attribution in one always-on system.
- Cassandra: an AI marketing brain that learns what drives growth and does the work.
- The difference: Sellforte is built around unified measurement; Cassandra around the work that follows what it learns.
What Sellforte publishes about its method
Sellforte describes:
- Model: an always-on Causal Bayesian MMM, calibrated by geo lift and conversion lift experiments.
- Experiments: geo lift, conversion lift import and A/B tests; results enter the MMM as Bayesian priors.
- Attribution: its own multi-touch attribution through Sellforte Pixel, or calibration of an MTA you already use.
How each reaches its figures
- Sellforte says it applies calibration multipliers to attribution data for daily incrementality-corrected ROAS per campaign and ad set.
- The multipliers are "channel-level correction factors derived from MMM and experiments", Sellforte says.
- Cassandra measures each channel, campaign and ad with a Bayesian model checked by live geo experiments.
- Ask both: a model separates channels by spend variation; how much stands behind the finest figure reported?
Measurement inside the daily loop
- The case is real: performance teams adjust spend daily; measurement on a planning cycle sits outside that loop.
- Sellforte: daily ad-set figures, and a Media Buyer Agent that it says pushes budget recommendations once you confirm.
- Cassandra: moves budgets and launches, pauses and adjusts ads, within the rules the team sets.
What each lists about pricing
As listed on 12 October 2026, at the $300,000 average monthly media spend shown on Sellforte's pricing page:
- Incrementality Testing: $1,900 a month.
- Incremental Attribution: $2,500 a month.
- Full-Funnel MMM: $4,500 a month plus customizations.
- Enterprise: $8,500 a month plus customizations.
- Pricing depends on package, average monthly media spend and sales channels in scope.
Cassandra: start for free with your website and data, or book a demo. Paid plans scale with yearly ad spend.
Questions to ask both vendors
- How does each model separate two channels whose spend moved together? It shows what grain the evidence supports.
- Show me the priors on a live model, and change one. A fair request of either.
- Show me how last quarter's experiment changed the model. Which estimates moved, and by how much.
Limits worth knowing
- Spend history: a channel needs enough spend, and variation in it, for the model to read.
- Regions: geo experiments need regional structure and a comparison group.
- Time: tests need a few weeks; keep test regions free of other changes.
Cassandra, an AI marketing brain for growth teams, learns what drives your growth and does the work within the rules your team sets. Start for free with your website and data, or book a demo.
What moving between platforms involves
- History and experiments move with you: experiment results remain valid evidence in any model.
- To Cassandra: budgets, ads, creative and reports become its work; decide in advance what waits for approval.
- To Sellforte: a daily ad-set reporting layer is added; run both on one period and explain any gap.
How to choose
- Sellforte: retail or ecommerce, daily ad-set decisions, one system for MMM, incrementality and attribution.
- Cassandra: a team that wants what it learns turned into work done, within the rules it sets.
- Unsure: ask both to show how one figure was produced, from data to number, and what happens next.
Questions
What is the difference between Cassandra and Sellforte for marketing mix modeling?
Both use a Bayesian marketing mix model fed by experiments. Sellforte states daily incremental ROAS by campaign and ad set for retail and ecommerce, and includes attribution. Cassandra, an AI marketing brain for growth teams, checks attribution against measured lift and does the work.
Does Sellforte publish pricing?
Yes. As listed on 12 October 2026, at $300,000 average monthly media spend: Incrementality Testing $1,900 a month, Incremental Attribution $2,500, Full-Funnel MMM $4,500 and Enterprise $8,500, the last two plus customizations. Prices vary with spend and scope.
Is Sellforte Bayesian?
Sellforte describes an always-on Causal Bayesian MMM, and says experiment results feed back into it as Bayesian priors.
How does Sellforte report ROAS at ad-set level?
Sellforte says it applies calibration multipliers from its MMM and experiments to attribution data, giving incrementality-corrected ROAS by campaign and ad set every day.
What are alternatives to Sellforte?
Our list of marketing mix modeling software sets out several platforms and who each suits, including Cassandra, an AI marketing brain that learns what drives growth and does the work for the team.