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Alternatives

The best rex alternatives.

rex by AureliaX is a managed Bayesian marketing mix modeling service from Amsterdam. If you want the same kind of service with a forecast record you can inspect, the strongest alternative is Odins: one managed Bayesian model per market, with forecasts stored before actuals arrive. Odins is ours, so we say it up front. Four more options follow, sorted by who they fit.

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Reviewed October 2026 · sources cited on this page

The alternatives

Five alternatives, sorted by fit.

rex is a managed MMM service from AureliaX in Amsterdam: priors set with your team, offline media in the model and monthly reviewed recommendations, with single-country European markets in mind. These five are the options we would compare it with. The best-for lines say which one suits you.

  1. Odins

    Managed Bayesian platform That's us

    Best rex alternative for advertisers who want managed Bayesian MMM with a forecast record they can inspect.

    Odins is a managed marketing investment platform, and the closest match to rex on this list. One Bayesian model per market, with TV, radio, OOH and print next to digital, pricing and promotions, and priors set with your team from spend history, digital saturation signals and structured interviews. Data flows in daily and scenarios and forecasts are yours to run any time, including from Claude via the Odins MCP. The model is retrained monthly, forecasts are stored before actuals arrive and checked at each retrain, and a person reviews every recommendation. Disclosure: this is our platform.

    Bayesian MMM · Fully managed · Daily data, monthly retrain Odins vs rex

  2. Mutinex

    Enterprise platform

    Best for multi-brand enterprises that need one MMM hierarchy across markets.

    GrowthOS packages enterprise MMM as cleanly as anyone, with real scale: more than 100 global brands and over 13 billion dollars in commercial decisions, by Mutinex's count. Run from Sydney, Melbourne and New York.

    MMM platform · Managed · Always-on Odins vs Mutinex

  3. Recast

    Advanced specialist

    Best for large, mostly US advertisers with analytics teams and daily data.

    A Bayesian MMM with time-varying parameters, weekly automated refreshes and out-of-sample backtesting. Built for Fortune 500 and large DTC budgets, with enterprise pricing that is not published.

    Bayesian MMM · Managed platform · Weekly refresh Odins vs Recast

  4. Analytic Partners

    Enterprise incumbent

    Best for billion-dollar advertisers running global commercial analytics programs.

    The 2025 Gartner Magic Quadrant Leader, 25 years into the category, with the ROI Genome benchmark layer and published research on halo effects few can match. Software plus consulting, scoped and priced for the largest advertisers.

    Proprietary MMM · Software plus consulting · Enterprise Odins vs Analytic Partners

  5. Google Meridian

    Open-source framework

    Best open-source option for teams with data scientists and geo-level data.

    Google's Bayesian framework, the most packaged of the open three, with the strongest budget optimizer and native geo-level modeling. You build and maintain everything yourself, and a 2026 academic review flags the default uniform priors as a misuse risk. Free license, paid for in staff and time.

    Bayesian framework · Self-hosted · Your team runs it Odins vs Meridian

rex facts come from rexmetrics.com and aureliax.co, read October 2026. Other provider facts come from each vendor's public documentation, read September 2026: mutinex.co, getrecast.com, analyticpartners.com and developers.google.com/meridian. Odins is our platform.

At a glance

Which alternative for which need.

Start from the scale you work at, and how much of the model you want to own.

Best fit
Why
Managed Bayesian MMM with a forecast record to inspect
Best fitOdins
WhyForecasts stored before actuals and checked at every monthly retrain, with offline media and business drivers in the model
One MMM hierarchy across many brands and markets
Best fitMutinex
WhyGrowthOS with campaign-varying modeling, at multi-brand enterprise scale
Large, mostly US budgets with an analytics team
Best fitRecast
WhyTime-varying Bayesian MMM with weekly refreshes and out-of-sample backtesting
A global commercial analytics program
Best fitAnalytic Partners
WhySoftware plus consulting, with the ROI Genome benchmark layer
Building it in-house with data scientists
Best fitGoogle Meridian
WhyOpen-source Bayesian framework with a budget optimizer; your team builds and runs it

Sources as listed above. Where a vendor does not state something publicly, we left it out.

When to look elsewhere

Four reasons to look for a rex alternative.

rex offers managed Bayesian MMM with priors set with your team and offline media in the model, and for a single-country European advertiser it belongs on the shortlist. These are the situations where you might weigh it against others.

  • You want to see a forecast record, forecasts set against actuals at each retrain, before you sign
  • You run many brands and markets and need one model hierarchy across them
  • Your budget is large and mostly US, with an analytics team that wants weekly refreshes
  • You have data scientists and would rather own the model in-house
Why Odins

Managed Bayesian MMM, with the record on show.

Odins is MMM, run for you. The model sets the budget level and the split between channels, and every forecast it makes is kept so you can check it against what happened.

  • One Bayesian model per market, with TV, radio, OOH and print next to digital, pricing and promotions
  • Priors set in 2 to 3 working sessions, from your spend history, digital saturation signals and structured interviews
  • Results from lift and geo tests you have run are taken into the model, and a structured test is proposed when a channel is uncertain
  • Data flows in daily and scenarios and forecasts run any time, in the platform or from Claude via the Odins MCP; the retrain and reviewed recommendation are monthly
  • Forecasts stored before actuals arrive, so the model's record is there to inspect

Channel contribution, 80% ranges

from the posterior
Search 14 to 16% optimize
Social 9 to 13% optimize
Display 2 to 9% test first

A tight range is a decision. A wide range is a test plan, with cost boundaries.

FAQ

Frequently asked questions.

What is the best alternative to rex by AureliaX?

It depends on your scale and how much of the model you want to own. For managed Bayesian MMM with offline media in the model and a forecast record you can inspect, Odins is the alternative we would point to, and yes, it is ours. For one hierarchy across many brands and markets, Mutinex. For large, mostly US budgets with an analytics team, Recast. For a global commercial analytics program, Analytic Partners. For an in-house build, Google Meridian.

How is Odins different from rex?

On paper the two describe much the same managed service: Bayesian MMM, priors set with your team, offline media in the model and monthly reviewed recommendations. Odins stores every forecast before the actuals arrive and checks it at each retrain, with the record visible in the platform, and lets you question the model from Claude via the Odins MCP. The full comparison, with sources, is on Odins vs rex.

Does Odins work for single-country markets?

Yes, and that is where priors matter most. A market with one national weekly series gives the model few regions to learn from, so we set the priors with your team in 2 to 3 working sessions, from spend history, digital saturation signals and structured interviews. Results from tests you have run are taken into the model too.

Is there another managed MMM service like rex?

Yes. Odins is the closest match on this list. Mutinex runs managed MMM at multi-brand enterprise scale, and Analytic Partners pairs software with consulting for the largest advertisers.

What does a rex alternative cost?

AureliaX does not publish prices for rex; pricing is on request. Most platforms on this list do not publish pricing either, ours included. Odins is a subscription priced for the budget it optimizes, for companies with a marketing budget from EUR 1M to several hundred million a year, with the team included and no data science hires needed.

Talk to our team

Marketing spend, modeled like an investment.

A 30-minute walkthrough of the model, the priors and the verification, on your channels.

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