What Arithmer does

Arithmer (Arithmer株式会社) is a private Japanese AI development company founded as the first venture to emerge from the University of Tokyo Graduate School of Mathematical Sciences, with operations dating to 2017 and a registered Tokyo headquarters. The company provides domain-specific AI solutions built on a proprietary mathematics-first engine (topology, super-discretization, Hilbert space methods, partial differential equations) rather than off-the-shelf deep learning, organized into three R&D pillars: image analytics, database and natural-language processing, and robotics. Its product portfolio comprises nine named vertical solution lines — Physical AI, AI Agent, Manufacturing AI, Infrastructure AI, Retail AI, Wind Power AI, Logistics AI, Bio AI, and Flood Risk Assessment AI — plus specialized products such as ArithmerOCR, the Konaka co-developed auto body-measurement app, the AtHome laundry image-detection AI, the Toda Corporation hazard-detection system, and the CPA Learning AI agent.

Arithmer serves a wide range of Japanese enterprise, mid-market, and government customers including Mitsui Sumitomo Insurance, Aioi Nissay Dowa, Toda Corporation, Takenaka, Yahagi Construction, JFE Engineering, Toshiba, Toyota Auto Body, NEC, SCSK, Konaka, YAMADAYA, AtHome, Eurus Energy, Kyuden Mirai Energy, Otsuka Pharmaceutical Factory, Amano Enzyme, Tokushima Prefecture, and Hirono Town in Fukushima. The company employs a research-dense team of approximately 60 engineers (50%+ holding PhD or master's degrees from Tokyo, Kyoto, and Osaka universities) and operates an R&D office at Tokushima University in addition to its Tokyo headquarters and Tokushima branch.

The business model is B2B enterprise custom AI development combined with capital and business alliances: Arithmer generates revenue through project-based custom AI solution contracts, deployment of proprietary AI engines into client products (such as Konaka's DIFFERENCE/SUIT SELECT apps and CPA Learning's platform), and joint commercialization funded via capital alliances with strategic partners (Toyota Tsusho, NS Solutions, ONODERA GROUP, Paloma Reem, NC Holdings). Capital has been raised through Seed (2018), Series A (2018), Series B (September 2019, over 1 billion yen with Toyota Tsusho), and a 2020 third-party allocation (500 million yen, lead by Pegasus Tech Ventures with Tokushima Taisho Bank), with recurring capital-alliance rounds continuing through 2026 alongside partnerships with KPMG AZSA, NC Holdings, and the University of Tokyo. The company is ISO/IEC 27001:2022 certified and Privacy Mark certified, supporting enterprise and government sales.

Name

Arithmer

Legal name

Arithmer株式会社

Website

https://arithmer.co.jp

Company type

Private

Founded year

2017

Operating status

Operating

Headcount range

51–100 employees

Short description

Arithmer is a private Japanese AI company, spun out of the University of Tokyo Graduate School of Mathematical Sciences, that builds mathematics-first AI engines and vertical solutions (Physical AI, AI Agent, flood-prediction, manufacturing, retail, logistics, bio, and energy AI) for Japanese enterprises and government clients, monetizing through custom B2B development and capital-alliance partnerships.

Ownership category

akta.pro rank

Product category

Enterprise AI Software (Vertical AI Solutions)

NAICS

Custom Computer Programming Services (541511), Computer Systems Design Services (541512), Computer Systems Design and Related Services (54151)

SIC

Services-Computer Programming Services (7371), Services-Computer Programming, Data Processing, Etc. (7370), Services-Prepackaged Software (7372)

akta.pro primary industry

AI/ML Engineering & Model Development Services (BPAEAHAF)

akta.pro secondary industries

AI Application Enablement Platforms (Copilot/Agent Frameworks, SDKs) (HDAEANAJ), End-to-End Enterprise AI Platforms (MLOps & Model Lifecycle Management) (HDAEANAA)

Keywords

• Enterprise AI solutions
• Mathematics-based AI
• Computer vision software
• Vertical AI applications
• AI consulting services

Headquarters

HQ city

Roppongi

HQ country

Japan

HQ region

Asia

Offices4 records

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Marketing or Sales, Operations, Infrastructure

Revenue model

1. Custom AI Solution Development: Project-based B2B contracts where Arithmer develops bespoke AI systems tailored to enterprise client needs (e.g., flood prediction for Hirono Town, automated measurement for Konaka, OCR for back-office). Revenue is milestone-based on custom development engagements.
2. AI Software Licensing / Deployment: Deployment of proprietary AI engines (image measurement, OCR, AI agents) into client products and platforms, such as Konaca's DIFFERENCE and SUIT SELECT ordering apps, and CPA Learning's learning platform.
3. Capital Alliance Funded Joint Development: Joint product commercialization funded via capital alliances with strategic partners (Toyota Tsusho, NS Solutions, ONODERA GROUP, Paloma Reem, NC Holdings), combining capital injection with business cooperation.
4. Equity Financing: Capital raised through Series A (Sept 2018), Series B (Sept 2019, >1B yen), and follow-on rounds (July 2020, 500M+ yen) from Pegasus Tech Ventures, Tokushima Taisho Bank, Toyota Tsusho, and other investors to fund R&D and productization.

Pricing tiers

Go-to-market motion4 records

Distribution channels4 records

Marketing channels7 records

Core offering

Arithmer develops and deploys custom and packaged AI software solutions for Japanese enterprises and government entities, built on a proprietary mathematics-based AI engine (topology, super-discretization, Hilbert space methods, PDEs). Its portfolio comprises nine vertical solution lines — Physical AI, AI Agent, Manufacturing AI, Infrastructure AI, Retail AI, Wind Power AI, Logistics AI, Bio AI, and Flood Risk Assessment AI — alongside specialized products such as ArithmerOCR, ArithmerR3 smartphone body measurement, driving assistance AI, and AI high-speed inspection. Solutions are delivered as custom B2B engineering contracts, OEM/embedded deployments, and licensing engagements.

Product overview

Arithmer offers a portfolio of domain-specific AI solutions organized as a platform-plus-verticals architecture, all built on a common mathematical-AI core ("高度数学" / advanced mathematics) developed by the company. The portfolio includes nine named solution lines on the corporate website — Physical AI (フィジカルAI), AI Agent (AIエージェント), Manufacturing AI (製造AI), Infrastructure AI (インフラAI), Retail AI (リテールAI), Wind Power AI (風力AI), Logistics AI (物流AI), Bio AI (バイオAI), and Flood Risk Assessment AI (浸水AI) — each targeting a different industry vertical. Layered on top of these verticals are several named specialized products: the Konaka-co-developed auto body-measurement AI (ArithmerR3 / Konaka AI Image Measurement App), the At Home-co-developed Inappropriate Image Detection/Processing AI for laundry, the driving-assistance AI system for trucks, the danger-detection AI for Toda Corporation, ArithmerOCR for handwritten documents, the AI high-speed automatic inspection system for manufacturing, and the Cell Design learning-visualization smartphone app for Naruto University of Education. Underlying capabilities span image analysis, database & natural-language processing, and robotics, organized around the company's three R&D pillars. Arithmer also operates the company-wide ISMS (ISO/IEC 27001:2022) and Privacy Mark certifications covering R&D, business, and management divisions, and has formal cooperation/co-development arrangements with the University of Tokyo, KPMG Azsa, Konaka, At Home, Toda Corporation, Mitsui Sumitomo Insurance, and others that feed the platform's productization.

Differentiator

Problem solved

Functional benefit

Brands

• ArithmerR3: Arithmer's smartphone-based image measurement (採寸) system using statistical methods, referenced in a publication in 'Sugaku Seminar' magazine.

Products and services

• Physical AI (フィジカルAI) Arithmer's Physical AI solution line combining computer vision, robotics, and mathematical AI engines to enable physical-world AI applications such as construction-site danger detection, autonomous driving support, and bio/robotics experiments.
• AI Agent (AIエージェント) Arithmer's autonomous-AI-agent offering providing conversational and task-execution AI agents for enterprise workflows; deployed to CPA Learning's accounting-education platform and featured in the KPMG Azsa business-reform cooperation agreement.
• Manufacturing AI (製造AI) AI solutions for manufacturing, including the AI high-speed automatic inspection system that uses Arithmer's proprietary image-analysis technology for fast visual quality inspection on production lines.
• Infrastructure AI (インフラAI) AI for infrastructure and construction, including the danger-detection AI system provided to Toda Corporation that identifies hazards on construction sites.
• Retail AI (リテールAI) AI solutions for retail, encompassing the auto body-measurement system (ArithmerR3) jointly developed with Konaka for made-to-order suits and smartphone-based body measurement.
• Wind Power AI (風力AI) AI for the wind-power industry, applying mathematical and AI engines to forecast and optimize wind-power generation. Provided to Kyuden Mirai Energy in April 2024.
• Logistics AI (物流AI) AI solutions for logistics and transportation, including the driving-assistance AI system co-developed with Taiwa Sogo Unyu that uses AI image analysis on truck cameras to detect vehicles, pedestrians, and abnormal driving behavior.
• Bio AI (バイオAI) AI for the bio/life-science domain, including applications in radiation-medicine production, AI-robot drug discovery, and quantitative-biology research. Underpins Arithmer's joint research with the University of Tokyo Isotope Center on alpha-ray drug manufacturing.
• Flood Risk Assessment AI (浸水AI) Arithmer's flood-prediction and flood-risk-assessment AI system, which builds 3D maps from drone surveys and runs AI simulations of water flow to predict per-building cm-level inundation. Deployed at Hirono Town, Fukushima and used by Mitsui Sumitomo Insurance and Aioi Nissay Dowa Insurance.
• Inappropriate Image Detection/Processing AI (Laundry) Image-detection AI model that specifically identifies laundry in real-estate property photos and automatically applies privacy processing (e.g., mosaic), jointly developed with At Home and At Home Lab for use by real estate agencies handling large volumes of property listing images.
• Driving Assistance AI System AI system using 3 cameras on trucks (front and side mirrors) to detect inter-vehicle distance, blind spots, obstacles, drowsiness, phone use, and traffic-signal violations. Deployed with Taiwa Sogo Unyu.
• Auto Body-Measurement AI (ArithmerR3 / Konaka AI Image Measurement App) Smartphone-based auto body-measurement AI that takes 4 photos of a clothed person to compute body dimensions for made-to-order suits. Co-developed with Konaka and used by DIFFERENCE and SUIT SELECT brands.
• ArithmerOCR Arithmer's in-house OCR engine that digitizes handwritten application forms and documents to support automation of paperwork-heavy business processes. Featured in Nikkei Sangyo Shimbun.
• AI High-Speed Automatic Inspection System AI high-speed automatic inspection system that applies Arithmer's proprietary image-analysis technology to fast visual inspection, supporting the Manufacturing AI vertical.
• Cell Design (セルデザ) Learning Visualization App Smartphone application that visualizes student learning for Naruto University of Education, providing a mobile interface to Arithmer's data-analysis capabilities.

Quantifiable outcome

• Flood prediction reduced from months/years to under 1 hour at 1cm resolution per house
• +4 more outcomes

Named customers21 records

Segments10 records

Ideal customer profiles9 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability13 records

Feature8 records

Partnerships

16 partnerships are on record, tiered core, flagship and minor.

• AtHome (AtHome Lab)coreStrategic or Co-development Partner · 14 April 2026AtHome and its group company AtHome Lab jointly developed with Arithmer the 'Inappropriate Image Detection/Processing AI (Laundry)' to automatically detect and mosaic laundry items in real-estate property photos. The AI reduces the manual review burden of real estate firms handling large volumes of listing images, also strengthening privacy protection. Service launched April 14, 2026.
• The University of Tokyo (東京大学)flagshipStrategic or Co-development Partner · 1 April 2026Naming plan (facility naming rights) agreement signed with the University of Tokyo. K211 lecture room at Komaba Campus 21KOMCEE East 2F will be named 'Arithmer Lecture Room' and 3F life science lab will be named 'Arithmer Laboratory' for the period April 1, 2026 to March 31, 2031. Reinforces Arithmer's link to its University of Tokyo Graduate School of Mathematical Sciences origin.
• NC Holdings (NCホールディングス)flagshipStrategic or Co-development Partner · 27 March 2026Business alliance agreement for realization of next-generation smart infrastructure. Covered by Nihon Keizai Shimbun (March 30, 2026).
• KPMG AZSA (有限責任 あずさ監査法人)flagshipStrategic or Co-development Partner · 17 February 2026Business alliance agreement signed with KPMG Japan member firm AZSA LLC. Applies Arithmer's generative AI, AI agents, and physical AI technologies to support business reform initiatives. Featured in Nihon Keizai Shimbun (February 26, 2026).
• CPA Learning (CPA Excellent Partners)coreTechnology or Integration · 24 December 2025Deployed Arithmer AI agent to CPA Learning's accounting exam learning platform from December 24, 2025.
• Naruto University of Education and Tokushima Prefectural Board of Education (国立大学法人鳴門教育大学、徳島県教育委員会)coreStrategic or Co-development Partner · 11 November 2024Three-party agreement signed for collaboration in education and AI; supported development of 'Seldeza' smartphone app for visualizing student learning deployed at Naruto University of Education in May 2025.
• Tokushima Prefecture (徳島県)coreStrategic or Co-development Partner · 28 September 2020Comprehensive cooperation agreement covering AI/IT technology collaboration between Arithmer and Tokushima Prefecture.
• Taiwa Sogo Unyu (大輪総合運輸)coreStrategic or Co-development Partner · 3 July 2020Joint development of driving support AI system for trucks, including left-turn collision avoidance, drowsiness detection, and front-camera obstacle detection. Featured on Shikoku Broadcasting July 3, 2020.
• Hirono Town (Fukushima Prefecture) and partnerscoreStrategic or Co-development Partner · 3 June 2020Agreement signed for the AI Smart City Project, deploying Arithmer's flood prediction AI in Hirono Town as the first municipality to adopt the system nationally.
• Owada Surveying Design and Fukushima KOSEN (株式会社大和田測量設計 / 福島工業高等専門学校)coreStrategic or Co-development Partner · 1 June 2020Co-production partnership for the NHK 'Ohayo Nippon' feature on the flood prediction AI system, June 1, 2020. Owada Surveying Design leads drone-based 3D terrain mapping; Fukushima KOSEN contributes technical expertise.
• University of Tokyo Isotope Center (Prof. Yoichiro Wada)coreStrategic or Co-development Partner · 1 June 2019Joint research collaboration applying advanced mathematical AI to automation of alpha-ray anti-cancer drug manufacturing and supply. Includes the 'International Mathematics Institute Niseko' initiative and Arithmer Seminar #04 lecture.
• Konaka (株式会社コナカ)flagshipStrategic or Co-development Partner · 15 November 2018Joint development of AI image measurement ('AIを活用した画像採寸アプリ') app for ordering custom suits, launched November 15, 2018. Extended with improved version December 20, 2018 covering 8 additional items (neckties, belts). Also deployed in Konaka's SUIT SELECT format from February 2020.
• AiCON TOKYO (subsidiary of Allidea Architects)minorGTM or Marketing Partner · 18 September 2018Business alliance in the area of AI data analysis for video advertising. AiCON TOKYO also designed Arithmer's Nikkei and Tokushima Airport advertisements.
• Mitsui Sumitomo Insurance (三井住友海上火災保険)flagshipStrategic or Co-development Partner · 9 February 2018AI advisory contract signed February 9, 2018 to introduce AI systems for insurance claim payment operations and accelerate new services for customers. Mitsui Sumitomo subsequently adopted Arithmer's flood prediction AI for damage assessment.
• Tokushima Bank (徳島銀行)minorStrategic or Co-development Partner · 17 May 2017Advisory contract covering FinTech and AI systems, announced May 17, 2017. Covered by Nihon Keizai Shimbun, Nikkei Sangyo Shimbun, and Tokushima Shimbun.
• Otsuka Pharmaceutical Factory (株式会社大塚製薬工場)coreStrategic or Co-development Partner · 9 May 2017Development contract for bio-experiment and AI robot in regenerative medicine signed May 9, 2017.

Scale indicators7 records

Recent moves8 records

Expansion highlights6 records

Direct peers

• Preferred Networks: Japan's flagship deep-tech AI company with a similar math/physics foundation (founded by U-Tokyo ML researchers). Operates across industrial AI, robotics and life sciences — overlapping with Arithmer's Physical AI, Bio AI and industrial verticals. Both are NEXT-Unicorn-tier Japanese AI firms with PhD-heavy talent bases.
• ABEJA: Japanese AI/MLOps startup providing enterprise AI platform and data analytics services to large Japanese corporations. Directly comparable in enterprise B2B AI go-to-market, funding stage, and use of capital alliances to scale.
• LeapMind: Japanese AI startup focused on deep learning and edge AI for industrial customers. Comparable stage, Japanese enterprise customer base, and vertical-AI deployment model across manufacturing and infrastructure.
• Cogent Labs: Japanese AI startup offering NLP, OCR and data analytics products to enterprise customers (Toshiba is a known partner). Closely comparable in product mix (OCR/NLP/document automation) and Japanese enterprise B2B motion.
• HeroZ: Listed Japanese AI company with deep-learning IP applied across verticals (real estate, construction, finance). Comparable Japanese enterprise AI focus and B2B vertical-AI business model.

Emerging players

• Sakana AI: Tokyo-based AI research company founded by former Google Brain researchers. Similar Japanese AI brand and research-driven DNA, though focused on foundation models rather than vertical AI applications; comparable NEXT-Unicorn-tier trajectory.
• Ubie: Japanese AI startup building AI agents and decision-support products for healthcare and adjacent verticals. Overlaps with Arithmer's AI Agent offering and Japanese B2B enterprise distribution approach.
• InstaDeep: Research-driven AI company (acquired by BioNTech in 2023) combining advanced mathematics/ML with industrial and biotech applications. Closely analogous to Arithmer's math-first AI thesis applied to verticals including life sciences.

Broad incumbents

• DataRobot: Global enterprise AI/MLOps platform. Comparable in targeting enterprise AI lifecycle tooling and AI engineering services, but at much greater scale and with a platform (not services) business model.
• NEC (NEC AI): Large Japanese incumbent with a significant enterprise AI portfolio (computer vision, biometrics, public-sector AI). A current Arithmer partner but also the dominant scaled competitor for many of the same Japanese enterprise and government accounts.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries1 record

Funding overview

Funding rounds5 records

Investors7 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Arithmer