Marimo
Marimo is an open-source reactive Python notebook platform (acquired by CoreWeave in October 2025) that stores notebooks as pure .py files, serves data scientists and ML/AI engineers at enterprises like BlackRock, Pfizer, and OpenAI, and monetizes via bundling within CoreWeave Cloud.
- Company typePrivate
- Founded2022
- HeadquartersSan Francisco, United States
- Headcount1–10
- GTM typeB2B and B2C
- OfferingSoftware
What Marimo does
Marimo is an open-source reactive Python notebook platform founded in 2022 and headquartered in San Francisco, with a team of fewer than 10 people. Its core product stores notebooks as pure Python (.py) files rather than JSON, enabling Git-native version control, pytest testing, and reuse as standard Python modules. The platform's reactive execution engine automatically re-runs dependent cells whenever a variable or code change occurs, structurally eliminating the hidden-state problem endemic to Jupyter and IPython notebooks. Built-in features include native SQL cells (supporting DuckDB, SQLite, Postgres, MySQL, Polars, Pandas, PyArrow), interactive UI elements, a VS Code extension, a CLI/library, and AI-native capabilities such as the marimo pair feature for connecting any AI agent to running notebook sessions.
The company serves data scientists, ML engineers, AI engineers, analytics engineers, and enterprise organizations across financial services (BlackRock, Capital One, DNB), pharmaceuticals (Pfizer, Moderna, Merck), AI labs (OpenAI, Mozilla AI, Owkin), technology platforms (Cloudflare, Shopify, Pinterest, Sonos), biotech (Cradle, Bunkerhill Health), and academia (Stanford, Johns Hopkins, UC Berkeley, Princeton, Columbia, SLAC). Its pre-acquisition go-to-market relied on product-led growth through GitHub distribution (~21.6k stars), Discord, developer competitions, and case studies, supplemented by an enterprise motion targeting organizations replacing Jupyter and Databricks notebooks. Sub-brands include molab (a free cloud-hosted notebook platform running on CoreWeave infrastructure with WebAssembly support) and Community Cloud.
Marimo was acquired by CoreWeave on October 30, 2025, integrating its technology into CoreWeave's AI cloud platform alongside the existing Weights & Biases developer tooling. The open-source project remains freely available under a permissive license. Pre-acquisition, Marimo operated a freemium open-source model with undisclosed enterprise licensing and had raised a $5M seed round from AIX Ventures in November 2024, with Morgan Stanley advising on the CoreWeave transaction. Following acquisition, Marimo's monetization is expected to shift toward bundling within CoreWeave Cloud subscriptions and managed-service offerings rather than direct licensing.
Marimo firmographics
Firmographics- Name
- Marimo
- Legal name
- Marimo Inc.
- Website
- https://marimo.io
- Company type
- Private
- Founded year
- 2022
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- Marimo is an open-source reactive Python notebook platform (acquired by CoreWeave in October 2025) that stores notebooks as pure .py files, serves data scientists and ML/AI engineers at enterprises like BlackRock, Pfizer, and OpenAI, and monetizes via bundling within CoreWeave Cloud.
- Ownership category
- akta.pro rank
Marimo industry classification
Industry- Product category
- Developer Tools / Interactive Computing / Data Science Notebooks
- NAICS
- Custom Computer Programming Services (541511), Software Publishers (5132)
- SIC
- Services-Prepackaged Software (7372), Services-Computer Programming, Data Processing, Etc. (7370)
- akta.pro primary industry
- Container Platforms & Orchestration (Kubernetes) (HDABADAF)
Keywords
Where Marimo is headquartered
LocationHeadquarters
- HQ city
- San Francisco
- HQ country
- United States
- HQ region
- North America
Markets served
Marimo business model
Business model- GTM type
- B2B and B2C
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Infrastructure, Marketing or Sales, Operations
Revenue model
- Open Source Core: The core marimo notebook is open-source and freely available under a permissive license. The open-source model drives community adoption, brand awareness, and product iteration through community contributions.
- Enterprise Licensing and Support: Enterprise offerings likely include commercial licensing, priority support, and custom integrations for organizations replacing legacy notebook solutions. The company targets enterprises via dedicated case studies and a for-enterprises landing page.
- CoreWeave Platform Integration: Following acquisition by CoreWeave, marimo serves as a component within CoreWeave's AI cloud platform, potentially bundled with CoreWeave Cloud subscriptions and contributing to platform stickiness and customer lifetime value.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Others | Open Source - Free tier |
| Freemium | Others | molab Cloud Platform - Free tier |
| Subscription | Annual | Enterprise - Custom pricing |
Go-to-market motion2 records
Distribution channels6 records
Marketing channels8 records
Marimo product offering
Product offeringCore offering
Marimo provides an open-source reactive Python notebook framework that stores notebooks as pure .py files enabling Git-native versioning, automated reactive cell execution, built-in SQL querying across multiple databases, and AI integration via marimo pair. The platform includes molab, a cloud-hosted notebook execution environment, a VS Code extension, and a CLI for running notebooks as scripts or deploying them as interactive web applications.
Differentiator
Problem solved
Functional benefit
Brands
- molab: Cloud-hosted marimo notebook platform for creating, running, and sharing interactive Python notebooks
- Community Cloud
Products and services
- marimo (Open-Source Reactive Python Notebook) Marimo is an open-source reactive Python notebook framework that stores notebooks as pure Python (.py) files rather than JSON, enabling Git-native version control, automated reactive cell execution, built-in SQL support, interactive UI elements, and deployment as web applications. The product is freely available under a permissive license and serves data scientists, ML engineers, AI engineers, and enterprises replacing legacy Jupyter notebooks.
- molab (Cloud-Hosted Notebook Platform) molab is Marimo's cloud-hosted notebook execution platform at molab.marimo.io, providing free WebAssembly-powered instant notebook execution without local installation. It enables developers to create, run, and share interactive Python and SQL notebooks rapidly on CoreWeave infrastructure, with public notebooks by default.
- Marimo VS Code Extension The Marimo VS Code extension enables developers to edit and run marimo notebooks directly within the Visual Studio Code IDE, integrating reactive Python notebooks into popular developer workflows.
- Marimo CLI and Library The Marimo CLI and library enable programmatic use of marimo notebooks, allowing developers to run notebooks from the command line, execute them as scripts locally or in pipelines, and integrate notebook execution into automated workflows.
- marimo pair (AI Agent Integration) marimo pair is an AI-native feature that enables developers to connect any AI agent to running marimo notebook sessions for collaborative coding, with built-in AI code completion, inline edits, and context-aware chat supporting any LLM model (hosted or local).
- Marimo Community Cloud Marimo Community Cloud is a free cloud hosting service for marimo notebooks, enabling users to deploy and share notebooks in the cloud without local setup, deployed on Vercel's edge infrastructure.
- Marimo Enterprise Offering Marimo Enterprise provides custom licensing, priority support, and integrations for organizations replacing legacy Jupyter or Databricks notebooks. The offering targets enterprise customers with case studies and is supported by CoreWeave's enterprise sales team following the October 2025 acquisition.
Quantifiable outcome
- marimo replaced Jupyter as primary notebook environment for organizations like Sumble, DNB Cyber Defense, and Bunkerhill Health
- +2 more outcomes
Companies that use Marimo
Customer profileNamed customers23 records
Segments6 records
Ideal customer profiles3 records
Marimo technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration18 records
AI capability7 records
Feature8 records
Marimo partnerships and signals
Strategic signalPartnerships
Eight partnerships are on record, tiered flagship, core and minor.
- CoreWeaveflagshipCoreWeave, an AI cloud infrastructure company, acquired Marimo Inc. on October 30, 2025. The acquisition integrates Marimo's technology into CoreWeave Cloud to create a unified developer experience across the AI lifecycle. Marimo augments CoreWeave's existing Weights & Biases developer platform and strengthens its vertically integrated AI developer offering. Marimo's open-source project remains freely available. This was CoreWeave's strategic move after shareholders rejected its $9B Core Scientific acquisition.
- CloudflarecoreCloudflare provides edge workers, CDN, DNS, R2 object storage for notebooks and artifacts, and database connectivity as a subprocessor. Marimo's infrastructure runs on CoreWeave with Cloudflare providing edge services.
- Vercel Inc.coreVercel hosts the marimo.io marketing site, Community Cloud, and playground platform. Marimo's web properties are deployed on Vercel's edge infrastructure.
- Modal Labs, Inc.coreModal Labs provides fallback kernel runtime for notebook execution in molab, enabling flexible compute infrastructure beyond CoreWeave.
- Weights & Biases, Inc.coreWeights & Biases provides AI-assisted code completion and notebook generation as a subprocessor. Also part of CoreWeave's AI developer platform ecosystem alongside marimo.
- GitHub, Inc.coreGitHub provides OAuth sign-in and importing notebooks from public repositories for the marimo platform and molab.
- Clerk, Inc.coreClerk provides user authentication, session management, and organization membership for marimo.io and molab platforms.
- alphaXivminorJoint notebook competition partner for molab Competition #2, challenging researchers to implement papers in marimo notebooks. Competition runs on GPUs with $2.5K+ in prizes.
Scale indicators3 records
Recent moves6 records
Expansion highlights6 records
Marimo competitors and assessment
Company assessmentDirect peers
- Project Jupyter: The incumbent Python notebook platform that marimo directly competes with and positions against. Marimo's reactive execution and .py-native storage are explicitly designed to solve Jupyter's hidden-state and JSON-format limitations.
- Databricks Notebooks: Cloud-native notebook environment bundled with the Databricks lakehouse platform. DNB Cyber Defense and other marimo customers explicitly cite replacing Databricks notebooks, making it a direct head-to-head competitor in enterprise data/ML workflows.
- Hex: Collaborative notebook and data app platform targeting data teams with notebook-to-dashboard workflows. Comparable offering to marimo's notebook-to-app positioning with similar target customers (data scientists, analytics engineers).
- Deepnote: AI-native collaborative notebook platform with Python and SQL support. Directly competes with marimo for data science and ML engineering teams seeking modern, collaborative notebook experiences.
- Observable: Reactive notebook platform for JavaScript-based data visualization and analysis. Shares marimo's core reactive execution philosophy applied to a different language ecosystem; a conceptual direct peer in the reactive notebook paradigm.
- Streamlit: Python framework for turning data scripts into shareable web applications, now part of Snowflake. Overlaps with marimo's notebook-to-app deployment capabilities for data scientists building interactive tools.
Broad incumbents
- Google Colab: Google's free cloud-hosted Jupyter notebook environment with broad enterprise reach and AI integration. Represents the free, accessible alternative that marimo's molab platform competes against for self-serve adoption.
- Weights & Biases: Sister company inside CoreWeave's developer platform providing experiment tracking and AI-assisted code completion. Now a complementary rather than competitive offering following CoreWeave's acquisition of both companies.
Emerging players
- Polynote: Netflix's open-source polyglot notebook with first-class Scala and Python support. Competes for users wanting improved notebook reproducibility over Jupyter, though with narrower language support than marimo.
- nteract: Open-source notebook platform with desktop and web experiences. Aimed at modernizing the Jupyter notebook experience for data scientists, overlapping with marimo's positioning as a next-generation notebook.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks5 records
Key highlights7 records
Customer concentration
Marimo social profiles
Digital presenceMarimo financial estimates
Financial estimateRevenue estimate
Valuation estimate
Marimo leadership team
Management profileNumber of profiles
Profiles10 records
Marimo funding detail
Funding detailFunding overview
Funding rounds1 record
Investors1 record
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Marimo M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Marimo
What does Marimo do?
Marimo provides an open-source reactive Python notebook framework that stores notebooks as pure .py files enabling Git-native versioning, automated reactive cell execution, built-in SQL querying across multiple databases, and AI integration via marimo pair. The platform includes molab, a cloud-hosted notebook execution environment, a VS Code extension, and a CLI for running notebooks as scripts or deploying them as interactive web applications.
Is Marimo a public or private company?
Marimo is a private company. It is classified as corporate owned and is currently operating.
When was Marimo founded?
Marimo was founded in 2022. It employs 1 to 10 people.
Where is Marimo based?
Marimo is headquartered in San Francisco, United States, in the North America region.
How does Marimo make money?
Three revenue lines are on record. Open Source Core is the primary driver. The others are enterprise Licensing and Support and coreWeave Platform Integration.
Who are Marimo's main competitors?
Direct peers on record are Project Jupyter, Databricks Notebooks, Hex, Deepnote, Observable and Streamlit. Broad incumbents are Google Colab and Weights & Biases. Emerging players are Polynote and nteract.
Does Marimo have an API?
Yes. Marimo offers Application Program Interfaces (APIs) for its services. The Terms of Service state that APIs are available for some services (currently Marimo). Third parties may not access the API if the functionality is part of an application that remotely records, monitors, or reports a Service user's activity other than time tracking. Abuse or excessively frequent requests may result in temporary or permanent suspension of API access.
What industry is Marimo in?
Marimo's product category is Developer Tools / Interactive Computing / Data Science Notebooks. Its primary akta.pro industry code is HDABADAF, Container Platforms & Orchestration (Kubernetes). Its NAICS code is 541511 and its SIC code is 7372.