Causal64

We build software, platforms and websites, and the data, machine learning and forecasting that run inside them. Every model we ship is tested on data it has never seen.

What we build

SoftwareCustom applications and internal toolsExplore PlatformsDashboards, client portals, multi-user systemsExplore WebsitesFast sites and web apps, built to rank and to convertExplore Data and CRMPipelines, clean customer data, reportingExplore Machine learning and AIScoring, classification, text, risk modelsExplore Forecasting and statisticsDemand, load and price forecasts, studies, surveysExplore

Software we build

Customer records and pipeline

A CRM your sales team opens every morning.

See the build

Model and simulation studio

Data, pipeline, runs and the model’s behaviour in one workspace.

See the build

III

Demand planning software

History, statistical forecast and consensus in one grid, with the alerts.

See the build

Websites, hung like the works they are.

Full page of an advisory house website built by Causal64 — I.Advisory houseInstitutional website, 2026HTML, CSS, photography

Search results page of a rental marketplace built by Causal64 — *II.***Marketplace**Search, listings, booking and host tools, 2026Web application, map, payments flow

Home page of an open data portal built by Causal64 — *III.***Data portal**Catalogue, datasets, API and dashboards, 2026Web application, maps, live charts

Wherever a decision rests on a number.

A model is only finished when it has passed a test it never saw coming.

We set aside part of your data before we start, open it once at the end, and hand you that result with its margin of error, whatever it says.

How we test a result

Research

Research noteHow we treat dataWhere each number comes from, what was known on the day, and how we catch data that leaks the answer.Read the note Research noteOur gatesThe tests a result must pass before we report it, and why a sealed sample is read only once.Read the note Research noteDetecting overfittingHow we tell a real effect from the best of many lucky tries, with the cases that fooled us first.Read the note

Team

Mahé Chadeffaud

Co-founder. Econophysics, machine learning and software.

Hugo Marotin

Co-founder. Econophysics, quantitative finance and machine learning. Independent contractor, acting for Causal64 under a written mandate.

We ship with

Supabase
Cloudflare
Hetzner
Anthropic
Nebius

Names are trademarks of their owners, used to describe the services we build with. No partnership is implied. Trademarks

Send us the brief.

A tender, a product to build, a dataset or a decision that needs a number. Tell us what you need. We reply with how we would do it and what it would cost.

contact@causal64.com