Accelerator
A fixed-term program that provides early-stage startups with a small investment, mentorship, and structure in exchange for equity.
An accelerator runs a cohort-based program, typically lasting 3-4 months, providing participating startups a modest upfront investment (often in the low hundreds of thousands, structured as a SAFE), intensive mentorship, structured curriculum, and culminating in a demo day where companies pitch to a room of investors. In exchange, the accelerator takes a small equity stake, and how much varies by program.
Beyond the capital and curriculum, the real value many founders cite is the peer cohort (dozens of other founders going through the same intense period simultaneously) and the accelerator's investor network, which can meaningfully speed up a seed fundraise immediately following the program.
For a first-time founder, a strong accelerator compresses a lot of painful trial and error into a few months. The check itself is rarely life-changing; what matters is the credential, the cohort, and the demo day, which puts a company in front of many seed investors at once and creates competitive dynamics a cold outreach campaign almost never achieves.
That signaling effect cuts both ways. Outcomes are concentrated in a handful of programs, so joining a weak or unknown program can cost similar equity while adding little fundraising leverage. Evaluate programs on graduate outcomes and the relevance of their investor network to your sector, not on marketing.
Y Combinator's standard deal is the reference point most programs are compared against. Per YC, it invests $500,000 on two SAFEs: $125,000 on a post-money SAFE for 7% of the company, and $375,000 on an uncapped SAFE with a most-favored-nation provision that converts on the terms of the company's next SAFEs or priced round. Model the fully diluted cost including the MFN piece, not just the headline percentage.
Using YC's published deal: if the company's next SAFEs are raised at a $15M post-money cap, YC's $375,000 MFN SAFE converts into $375,000 / $15M = 2.5% of the company. Add the fixed 7% and YC owns about 9.5% before later dilution.
Evaluate an accelerator primarily on its actual track record of graduate companies successfully raising follow-on funding and its investor network's relevance to your specific sector — brand name matters less than whether the program's specific network and structure fit your company's stage and needs.
How much equity do accelerators typically take?
It varies by program. At Y Combinator, the fixed piece is 7%, plus an uncapped MFN SAFE whose stake depends on the company's next round — in YC's own example of next SAFEs at a $15M post-money cap, that's another 2.5%, or about 9.5% in total. Other programs differ meaningfully: some offer larger investments for more equity, and some newer programs offer no-equity or fee-based structures instead.
What's the difference between an accelerator and an incubator?
An accelerator is fixed-term, cohort-based, invests capital for equity, and ends in a demo day. An incubator is usually open-ended, often provides space and lighter support without a structured curriculum or a standard investment, and may or may not take equity. The labels get used loosely, so read the actual documents.
How do you evaluate an accelerator beyond the brand name?
Ask what share of recent graduates raised a follow-on round within a year of demo day, get five alumni founders you can call, and find out which mentors have operating experience in your sector. If a program can't produce alumni references quickly, that's your answer.
Is demo day the end of the fundraise?
No — it's the start. Companies that raise well usually begin investor conversations before demo day and use the event as a forcing function for decisions.
Sources
Related terms
Run the numbers yourself: dilution, SAFE conversion, and fund-returner calculators.