# Top 30 Software Development companies in the Loire-Atlantique department
Tamtam tracks 137 Software Development companies headquartered in the Loire-Atlantique department. This list ranks the 30 largest by number of employees on LinkedIn, led by RCA, U IRIS devient U TECH and 4CAD Group. Their median headcount is 86. Half of them were founded in 2004 or later. The most common headquarters are Nantes (12), Saint-Herblain (5) and Carquefou (4).
The Loire-Atlantique department hosts a concentration of software development companies, ranging from mid-sized firms to larger groups. These companies specialize in a variety of sectors, offering solutions for accounting, retail, industrial efficiency, public administration, and e-commerce.
Key players include RCA, which develops software for accounting professionals, U IRIS devient U TECH, focusing on IT systems for the Groupement U, and 4CAD Group, providing PLM, ERP, and IoT tools for industrial optimization. Akeneo empowers businesses with product experience management, while ARP脠GE SAS delivers digital solutions for local governments. Obat specializes in invoicing software for the construction sector.
馃嚝馃嚪 Loire-Atlantique 路 30 companies 路 Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [RCA](https://www.tamtam.ai/c/rca) (rca.fr)
Develops innovative software solutions for accounting professionals and their clients, streamlining management, advisory services, and digital transition for accounting firms. | Software Development | 馃嚝馃嚪 Saint-Herblain | 1,626 | 1999 |
| 2 | [U IRIS devient U TECH](https://www.tamtam.ai/c/u-iris-devient-u-tech) (u-emploi.com)
Management and innovation of the entire Groupement U IT system, supporting retail, supply chain, and digital transformation projects. | Software Development | 馃嚝馃嚪 Carquefou | 637 | 2011 |
| 3 | [4CAD Group](https://www.tamtam.ai/c/4cad-group) (4cadgroup.com)
The company offers PLM, ERP, and IoT tools to help organizations optimize their information systems for increased industrial efficiency | Software Development | 馃嚝馃嚪 Bouguenais | 463 | 2004 |
| 4 | [Akeneo](https://www.tamtam.ai/c/akeneo) (akeneo.com)
Empowering business leaders with software, education, and community for product experience management. Offering intelligent Product Cloud for data enrichment, management, and syndication. | Software Development | 馃嚝馃嚪 Nantes | 427 | 2013 |
| 5 | [ARP脠GE SAS](https://www.tamtam.ai/c/arpege-sas) (arpege.fr)
Provides innovative digital solutions for local governments, focusing on population management, decision systems, and e-service platforms to enhance citizen experience. | Software Development | 馃嚝馃嚪 Saint-S茅bastien-sur-Loire | 331 | 1989 |
| 6 | [Proginov](https://www.tamtam.ai/c/proginov) (proginov.com)
French publisher of cloud-hosted management software and ERP solutions specializing in industrial, distribution, and healthcare sectors with dedicated secure data hosting services. | Software Development | 馃嚝馃嚪 La Chevroli猫re | 283 | 1996 |
| 7 | [Obat](https://www.tamtam.ai/c/obat) (obat.fr)
Specialized invoicing software designed for contractors and self-employed individuals within the construction sector Streamlining financial processes and improving efficiency | Software Development | 馃嚝馃嚪 Nantes | 274 | 2019 |
| 8 | [Lengow](https://www.tamtam.ai/c/lengow) (lengow.com)
E-commerce automation solution enabling brands to improve performance, automate processes, and expand internationally by integrating with 200+ marketplaces and 1,400+ channels | Software Development | 馃嚝馃嚪 Nantes | 177 | 2009 |
| 9 | [MONEWEB - JES](https://www.tamtam.ai/c/moneweb-jes) (jes.fr)
A French leader in collective space management solutions, providing a comprehensive approach for catering, payment, and other services with a focus on improving consumer experience | Software Development | 馃嚝馃嚪 Saint-Herblain | 126 | 1975 |
| 10 | [proLogistik France (DSIA)](https://www.tamtam.ai/c/prologistik-france-dsia) (logistar-dsia.com)
French subsidiary of a pan-European group, publishing, integrating, and hosting supply chain solutions, including WMS, OMS, LMS, TMS, ensuring optimal security and accessibility. | Software Development | 馃嚝馃嚪 Nantes | 114 | 1985 |
| 11 | [ISILOG](https://www.tamtam.ai/c/isilog) (isilog.fr)
A comprehensive service management solution with modules for asset, service, project management, and continuous improvement, aligning with ITIL and ISO 20000 standards | Software Development | 馃嚝馃嚪 Saint-Herblain | 103 | 1992 |
| 12 | [Wiztivi](https://www.tamtam.ai/c/wiztivi) (wiztivi.com)
Empowering telecom, media, and content providers to deliver next-generation entertainment experiences through cutting-edge video applications and a world-class cloud gaming solution. | Software Development | 馃嚝馃嚪 Carquefou | 98 | 2007 |
| 13 | [MyScript](https://www.tamtam.ai/c/myscript) (myscript.com)
Leader in real-time handwriting recognition using AI, offering interactive ink technology for digital content creation across various industries Innovating natural human-machine interfaces | Software Development | 馃嚝馃嚪 Nantes | 93 | 1998 |
| 14 | [Operis](https://www.tamtam.ai/c/operis) (web.operis.fr)
Operis specializes in digital solutions for French local authorities in urban planning, land management, heritage, and education, aiming to improve services for citizens and stakeholders | Software Development | 馃嚝馃嚪 Orvault | 89 | 2009 |
| 15 | [PerformanSe](https://www.tamtam.ai/c/performanse) (performanse.com)
A leader in behavioral and cognitive skills assessments, providing innovative solutions for HR professionals in recruitment, talent management, and vocational guidance | Software Development | 馃嚝馃嚪 Nantes | 86 | 1988 |
| 16 | [Mercuria](https://www.tamtam.ai/c/mercuria) (mercuria.fr)
Advises and supports businesses with SaaS, Cloud, or hosted solutions for accounting, financial, payroll, and HR management software, working with reliable publishers. | Software Development | 馃嚝馃嚪 La Chapelle-sur-Erdre | 82 | 1999 |
| 17 | [PRIOS GROUPE](https://www.tamtam.ai/c/prios-groupe) (prios.fr)
PRIOS Group specializes in developing industry-specific software for the agri-food and personal equipment sectors, offering ERP solutions, services, and complementary modules for businesses globally | Software Development | 馃嚝馃嚪 Carquefou | 77 | 1990 |
| 18 | [mobiappsFr](https://www.tamtam.ai/c/mobiappsfr) (mobiapps.fr)
mobiApps specializes in creating multiplatform mobile apps using emerging hybrid technologies like HTML/CSS and JavaScript, along with digital strategy services | Software Development | 馃嚝馃嚪 Orvault | 74 | 2014 |
| 19 | [KoralPlay](https://www.tamtam.ai/c/koralplay) (koralplay.com)
An experienced gaming technology partner providing omnichannel solutions, customized games, and comprehensive support for sports betting, gaming, and lottery operators globally | Software Development | 馃嚝馃嚪 Nantes | 72 | 2017 |
| 20 | [Meteodyn](https://www.tamtam.ai/c/meteodyn) (meteodyn.com)
The company specializes in wind engineering, meteorology, and climatology, offering software solutions and services for renewable energy, infrastructure, and climate change adaptation | Software Development | 馃嚝馃嚪 Saint-Herblain | 69 | 2003 |
| 21 | [SITACI](https://www.tamtam.ai/c/sitaci) (sitaci.fr)
Supply Chain Solution specialist with over 30 years of expertise in logistics, offering innovative WMS EGO software implemented in 520+ sites globally | Software Development | 馃嚝馃嚪 Haute Goulaine | 66 | 1987 |
| 22 | [Obeo](https://www.tamtam.ai/c/obeo) (obeosoft.com)
Provider of open modeling software solutions for industrial systems, IT applications, and digital transformation Offers Open Source technologies and custom modeling solutions | Software Development | 馃嚝馃嚪 Carquefou | 65 | 2005 |
| 23 | [Costructor](https://www.tamtam.ai/c/costructor) (costructor.co)
Costructor is the first all-in-one software for managing construction businesses on mobile or PC, offering comprehensive solutions for the industry | Software Development | 馃嚝馃嚪 Nantes | 64 | 2022 |
| 24 | [MicroEJ](https://www.tamtam.ai/c/microej) (microej.com)
Provides software solutions for embedded and IoT devices, transforming electronic products into software-defined, scalable, and flexible smart devices. | Software Development | 馃嚝馃嚪 Nantes | 58 | 2012 |
| 25 | [Inlead by Adplorer](https://www.tamtam.ai/c/inlead-by-adplorer) (inlead.fr)
InLead is a digital marketing platform for national networks, offering modules for geolocated campaigns, online reputation management, and personalized marketing strategies | Software Development | 馃嚝馃嚪 Nantes | 55 | 2016 |
| 26 | [Virage Group](https://www.tamtam.ai/c/virage-group) (viragegroup.com)
Provides management solutions to centralize strategic plans, evaluate progress, and manage project portfolios, ensuring investments generate expected value and support decision-making. | Software Development | 馃嚝馃嚪 Nantes | 50 | 2001 |
| 27 | [CEDREO](https://www.tamtam.ai/c/cedreo) (cedreo.com)
3D home design software for builders, contractors, and designers Creates efficient design presentations, 2D/3D floor plans, and photorealistic renderings to streamline sales processes | Software Development | 馃嚝馃嚪 Saint-Herblain | 44 | 2005 |
| 28 | [HerculePro](https://www.tamtam.ai/c/herculepro) (herculepro.com)
Publishes software for PVC, wood, aluminum joinery, blinds, gates, fences, and closures, connecting manufacturers with installers for specialized quotes. | Software Development | 馃嚝馃嚪 Cou毛ron | 40 | 2004 |
| 29 | [M茅dia Softs](https://www.tamtam.ai/c/media-softs) (mediasofts.fr)
A Nantes-based company specializing in software for landscaping professionals and metalwork, providing tools for technical design, project management, and business operations | Software Development | 馃嚝馃嚪 Vigneux-de-Bretagne | 39 | 1992 |
| 30 | [TOOVALU](https://www.tamtam.ai/c/toovalu) (toovalu.com)
Leader in Climate & CSR strategy software, Toovalu Impact supports clients and stakeholders in their RSE & Climate initiatives, focusing on sustainability and progress | Software Development | 馃嚝馃嚪 Nantes | 38 | 2012 |
## How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.
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Source: https://www.tamtam.ai/l/software-development-companies-loire-atlantique