# Cotool funding: rounds and investors

> Cotool has raised $500K across 1 round since 2025. Investors include Y Combinator. Every round with its source.

Source: https://millionrounds.com/company/cotool (Millionrounds; every figure on the page links to its filing or article)

United States · [Pre-seed startup](https://millionrounds.com/companies)

# Who invested in *Cotool*

One round we have observed, with the one investor named in it. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.

Cybersecurity

Funding summary Updated 26 Oct 2026

**$500K** raised across 1 round since 2025, from 1 source

- **Latest round:** Pre-seed, $500K Jun 2025
- **Investors:** 1

See who backed them

## The rounds

- **Jun 2025** Pre-seed **$500K** [Y Combinator](https://millionrounds.com/fund/y-combinator) Source recorded

## Everyone who backed them

[Y Combinator](https://millionrounds.com/fund/y-combinator) Accelerator **1** round

Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=cotool).

## Also claim to have backed them

These 2 firms list Cotool as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above.

[Homebrew](https://millionrounds.com/fund/homebrew) VC firm Per its own site

[515 Ventures](https://millionrounds.com/fund/515-ventures) VC firm Per its own site

## Quick answers about Cotool

### Who invested in Cotool?

Cotool's investors include Y Combinator.

### How much has Cotool raised?

Cotool has raised $500K across 1 round since 2025.

### When did Cotool last raise?

Cotool's most recent round was a Pre-seed of $500K in Jun 2025.

### What was Cotool's biggest round?

Its most recent round, $500K in Jun 2025, is also its largest on record.

### Who backed Cotool first?

Cotool's first round on record, in Jun 2025, was backed by Y Combinator.

### What stage is Cotool at?

Cotool's latest named round is a Pre-seed, in Jun 2025.

### Where is Cotool based?

Cotool is based in the United States.

## Companies like Cotool

In the same sector, and raised in the last eighteen months.

[**FORT Robotics** $39M · Oct 2026](https://millionrounds.com/company/fort-robotics)[**Opsin** $21M · Oct 2026](https://millionrounds.com/company/opsin)[**Harmonic Security** $68M · Oct 2026](https://millionrounds.com/company/harmonic-security)[**Reach Security** $60M · Oct 2026](https://millionrounds.com/company/reach-security)[**Persona** $210M · Oct 2026](https://millionrounds.com/company/persona)[**Hilt** $4.7M · Oct 2026](https://millionrounds.com/company/hilt)

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