Definition
A startup accelerator is an organisation or programme that supports a selected group of startups through an intensive, structured programme intended to accelerate business development and progress toward key milestones.
Accelerators commonly provide some combination of mentorship, business education, expert support, peer learning, investor connections, and access to entrepreneurial networks. Some also provide direct investment or other forms of financing.
There is no single internationally standardised definition of an accelerator. The distinction between accelerators and incubators is also not universally applied. The OECD notes that some organisations use the terms almost interchangeably, while others distinguish them based on factors such as company stage, programme duration, and cohort structure.
How does an accelerator work?
A typical accelerator programme involves:
Application or sourcing
Startups apply or are selected through a competitive process.Selection
The accelerator evaluates companies based on factors such as team, product, market, traction, and growth potential.Cohort formation
Selected startups commonly enter the programme as a cohort.Structured support
Startups receive mentorship, training, expert guidance, and other resources.Milestone development
The programme helps companies work toward defined business, product, commercial, or fundraising objectives.Investor and ecosystem access
Startups may receive introductions to investors, customers, partners, talent, and other ecosystem participants.Programme completion
Many accelerators conclude with a defined endpoint, sometimes including a Demo Day or investor presentation.
The exact structure differs significantly between programmes.
What do accelerators provide?
Common forms of support include:
Mentorship
Founders may work with experienced entrepreneurs, operators, investors, or industry specialists.
Business development
Programmes may help startups refine their business model, pricing, go-to-market strategy, sales process, or growth plans.
Investor access
Some accelerators provide introductions to investors or organise investor-facing events.
Network access
Startups can gain access to founders, companies, universities, advisers, customers, and other ecosystem participants.
Education and training
Programmes may cover areas such as:
Fundraising
Sales
Marketing
Product development
Financial management
Leadership
Legal and regulatory considerations
Capital
Some accelerators invest directly in participating companies, while others provide grants, loans, or no direct funding. The OECD identifies funding as one possible component rather than a universal feature of acceleration.
How long does an accelerator programme last?
Accelerator programmes are generally time-bound.
The OECD's 2026 analysis describes accelerators as typically operating through cohort-based programmes lasting from one to twelve months, although actual programme lengths vary.
Other OECD research describes many accelerator programmes as operating within shorter, condensed periods, commonly around three to six months.
There is therefore no universal accelerator duration.
Accelerator vs. incubator
The terms are often confused because both provide support to young companies.
Broadly:
Accelerator | Incubator | |
|---|---|---|
Typical focus | More developed startups | Earlier-stage or developing ventures |
Structure | Usually cohort-based | Often individual admission |
Duration | Usually time-bound | Often longer or open-ended |
Pace | Intensive and condensed | More gradual |
Objective | Accelerate growth and investment readiness | Develop and support the company over time |
Funding | May provide investment | May provide funding, but not necessarily |
Graduation | Usually defined | Often based on company development |
These distinctions are useful but not universal. The OECD explicitly notes that terminology and programme structures differ across countries and organisations.
Accelerator vs. venture capital firm
An accelerator and a venture capital firm can both provide startups with capital and investor access, but they serve different primary functions.
A venture capital firm primarily invests capital with the objective of generating financial returns.
An accelerator primarily provides a structured development programme intended to help startups progress more quickly. Some accelerators also invest.
An accelerator can therefore become a source of investment, but participation in an accelerator is not equivalent to receiving venture capital.
→ Venture Capital Firm
Do accelerators invest in startups?
Some do, but not all.
An accelerator may provide:
Equity investment
Convertible instruments
Grants
Loans
No direct funding
The terms vary considerably.
Where an accelerator invests in exchange for equity, founders should evaluate the investment alongside the value of the programme itself, including the programme's network, mentorship, investor access, and reputation.
What do accelerators look for?
Selection criteria vary, but accelerators may consider:
Founding team
Market opportunity
Product or technology
Evidence of customer demand
Growth potential
Business model
Scalability
Competitive position
Stage of development
Fit with the accelerator's expertise and network
Highly selective programmes may receive substantially more applications than they can accept.
The appropriate criteria depend on the accelerator's objectives and target companies.
Why do startups join accelerators?
Potential benefits include:
Faster learning
Structured guidance can help founders identify and address problems more quickly.
Access to expertise
Founders can obtain advice from experienced operators and specialists.
Investor exposure
Accelerators can help companies develop relationships with investors and prepare for fundraising.
Network effects
A cohort can create relationships with other founders who face similar challenges.
Credibility
Participation in a recognised programme can provide an additional signal to investors, customers, partners, or employees.
The value of the accelerator depends heavily on the quality and relevance of these resources.
What should founders evaluate before joining?
The brand name of an accelerator is only one consideration.
Founders should examine:
Investment terms
Equity dilution
Programme duration
Mentors and their actual involvement
Investor network
Alumni companies
Industry expertise
Geographic reach
Customer and partner network
Follow-on support
Programme curriculum
Selection and graduation process
A programme that is highly valuable for a consumer startup may be much less useful for a deep-tech, healthcare, or highly regulated company.
Are accelerators global?
Yes.
Accelerator models exist across different regions and can support companies targeting local, regional, or global markets.
Some programmes are geographically focused, while others recruit internationally or operate across multiple markets. The OECD has documented increasing internationalisation among incubation and acceleration support models.
There is therefore no inherently US-specific definition of an accelerator.
Example
A software startup has an early product and initial customers but needs to improve its go-to-market strategy and prepare for a larger financing round.
It applies to a six-month accelerator programme.
The startup is selected into a cohort with other founders. During the programme, it receives mentorship, works with industry experts, refines its sales strategy, meets potential customers, and develops relationships with investors.
The programme ends with an investor-facing presentation.
The accelerator has helped the startup compress learning, build relationships, and reach important milestones within a structured period.
Common misconception
An accelerator is simply an organisation that gives startups money.
No.
Funding can be part of an accelerator programme, but acceleration is fundamentally about structured support intended to help a startup progress faster.
An accelerator may provide capital, but its broader value can come from mentorship, expertise, networks, customer access, investor relationships, and concentrated founder development.
