L'Accélérateur

What L'Accélérateur does

L'Accélérateur, now operating as Day One Entrepreneurs & Partners, is a privately held French SAS incorporated in Paris on 21 May 2012 under President Michel de Guilhermier. The firm operates a single, undifferentiated startup-acceleration program targeted at early-stage French entrepreneurs and the founders of young companies, providing hands-on coaching, strategic mentorship, network access, and capital investment in exchange for equity or participation in portfolio success.

The product is not a modular SaaS platform but rather a comprehensive accelerator engagement: selected startups receive intensive personal coaching, introductions to the firm's partner network, and a stated capacity to deploy "several million euros" over time across the lifetime of each portfolio company. Marketing and distribution are direct-to-startup via the corporate website (laccelerateur.fr / dayonepartners.com), supplemented by an alumni-testimonial page featuring 40+ named portfolio companies (including PayPlug, SportHeroes, Comitam, FioulReduc, Vinotrip, TravelWifi, Watchdog Systems, GuestSuite, ReAssurez-Moi, Kol, AnimalBox, Big Moustache, Pixopolitan, FamiHero, and ZenChef), an annual community gathering (DAY ONE DAYS, first held in March 2017 at Château de Rosay), and a Twitter account (@laccelerateur / @DayOneEP). The company has no disclosed API, no app product, no patents or certifications, and no partnerships or alliances beyond its internal partner bench.

The revenue model is accelerator-typical and not separately monetized: Day One invests capital, time, and coaching in portfolio companies and captures value through equity participation or carried upside rather than through subscription fees. There are no disclosed funding rounds, no institutional investor base, and no public revenue figure. Operating geography is restricted to France (Paris-based headquarters at 13 rue de Marivaux, 75002), and the company is structured as a founder/operator-led entity with no parent, subsidiaries, M&A activity, or regulatory actions on record.

Name

L'Accélérateur

Legal name

Day One Entrepreneurs & Partners

Website

https://laccelerateur.fr

Company type

Private

Founded year

2012

Operating status

Operating

Short description

L'Accélérateur (now Day One Entrepreneurs & Partners) is a Paris-based French startup accelerator founded in 2012 that provides early-stage French founders with coaching, mentorship, network access, and multi-million-euro capital in exchange for equity participation.

Ownership category

akta.pro rank

Product category

Startup Accelerator / Business Incubation Services

NAICS

Professional and Management Development Training (61143)

SIC

Services-Management Consulting Services (8742)

akta.pro primary industry

Accelerators & Incubators (Investor-Operated) (FSANAAAM)

akta.pro secondary industry

Youth Business Incubators & Accelerators (EDAMAHAC)

Keywords

• Startup acceleration
• Business incubation
• Startup mentorship
• Early-stage investment
• Entrepreneur network

Headquarters

HQ city

Paris

HQ country

France

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Distribution channels1 record

Marketing channels4 records

Core offering

L'Accélérateur (now operating as Day One Entrepreneurs & Partners) is a French startup accelerator that provides early-stage entrepreneurs with intensive mentorship, strategic coaching, network access, and capital deployment of several million euros over time. The program focuses on building durable companies through close personal relationships with founders over multi-year engagements, taking an active partner role rather than a passive investor stance.

Product overview

L'Accélérateur (now operating as Day One Entrepreneurs & Partners) is a French startup accelerator offering a single, unified acceleration program. The company provides intensive mentorship, coaching, strategic business support, and capital investment to early-stage entrepreneurs. The program focuses on building lasting companies through personalized relationships, hands-on coaching, network access, and multi-year financial support (several million euros). The service is not a platform-plus-modules architecture but rather a comprehensive accelerator that accompanies startups from initial concept through growth stages via ongoing coaching sessions and partnership.

Differentiator

Problem solved

Functional benefit

Products and services

• Startup Acceleration Program An intensive mentorship and support program for early-stage French startups, providing coaching, strategic guidance, capital deployment of several million euros over time, and access to a network of partners and investors to help entrepreneurs develop their businesses from concept through growth stages.

Quantifiable outcome

• Portfolio company grew from idea stage to 40-person company within years
• +2 more outcomes

Named customers15 records

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

One partnership is on record.

• Day One Entrepreneurs & PartnerscoreOthersL'Accélérateur was rebranded as Day One Entrepreneurs & Partners. The organization operates a unique acceleration model in the French entrepreneurial ecosystem focused on investing in people and building lasting companies through hands-on mentorship, capital deployment, and network access.

Scale indicators3 records

Recent moves4 records

Expansion highlights3 records

Direct peers

• 50 Partners: Paris-based startup accelerator offering intensive 6-month programs with mentorship, capital, and operational support to early-stage French founders. Comparable as a French seed accelerator targeting similar deal profile.
• The Family: Paris-based startup accelerator and education platform founded in 2013, providing long-term support, capital, and community to European founders. Directly comparable as a French seed-stage accelerator targeting similar founder profiles.
• NUMA: Paris-headquartered startup accelerator (formerly Camping) operating acceleration programs across Europe, the Middle East, and Africa. Closely comparable as a French-rooted early-stage accelerator providing mentorship and capital to startups.
• Station F: World's largest startup campus located in Paris, founded by Xavier Niel in 2017. Operates a startup program hosting dozens of accelerators under one roof, directly competing for the same French early-stage startup cohort as Day One.
• Agoranov: Public tech incubator based in Paris since 2000, supporting deep-tech and innovative startups with mentoring, workspace, and pre-seed capital. Directly comparable as a long-standing Paris-based startup support organization.
• Makesense: Paris-based social-impact incubator and accelerator supporting entrepreneurs addressing social and environmental challenges. Comparable as a Paris-headquartered organization offering structured acceleration support to early-stage founders.

Broad incumbents

• Techstars: Global startup accelerator with multiple European programs (including Paris Techstars programs) providing 3-month mentorship-driven acceleration plus follow-on capital. Comparable as a globally scaled accelerator with French presence, though far larger and more standardized.
• Y Combinator: World's most prominent startup accelerator, US-headquartered, running biannual cohorts. While not Paris-based, YC is the gold-standard benchmark against which any French accelerator (including Day One) competes for top international founders.

Regional players

• H7 (Hub de Lyon): Lyon-based startup accelerator and innovation hub operating acceleration programs in the Auvergne-Rhône-Alpes region. Comparable in offering but operates in a different French geography than Day One's Paris focus.
• Euratechnologies: Lille-based startup incubator and accelerator operating in northern France, providing workspace, mentorship, and capital to early-stage companies. Comparable in mission but geographically distinct from Day One's Paris-centric operations.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/laccelerateur
• YouTubeyoutube.com/channel/UCwfFFJXLlhd0
• Facebookfacebook.com/225490190871801

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

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 L'Accélérateur