A Brooklyn startup is under fire for promoting a do-it-yourself rape kit dubbed the “MeToo Kit.”

The MeToo company promotes the kit — which is not yet for sale — on its website as the “first sexual assault evidence kit for at home usage.”

“MeToo is founded on the principle that you should be able to take back control,” the Downtown Brooklyn company says on its website. “Your experience. Your kit. Your story. Your life. Your choice.”

The company claims the kit will allow for evidence collection to be “administered within the confines of the survivor’s chosen place of safety” that “can provide the necessary time-sensitive evidence required in a court of law to identify a sexual predator’s involvement with sexual assault” — and that users “do not need any specialized training” to administer it.

But legal and sex assault experts were horrified at the idea, saying its results wouldn’t hold up in court and accusing the company of trying to cash in on the MeToo movement.

The New York City Alliance Against Sexual Assault said that it was “deeply disturbed to learn about the existence of a commercial rape kit.”

“We find the ‘MeToo Kits’ not only morally and legally irresponsible, but completely misleading to survivors of sexual assault,” the organization said.

“An assault leaves wounds that last for lifetimes, and this kit diminishes the seriousness of this crime to something trivial that can be processed alone,” the Alliance said. “Furthermore, the legality is specious, and it is likely that if these kits are submitted as evidence in court proceedings they will be thrown out, re-traumatizing survivors.”

Karen Friedman Agnifilo, the chief assistant district attorney of the Manhattan District Attorney’s Office, confirmed: “Material collected with this product would be inadmissible in court, and the use of this product would deprive a survivor of critical medical and trauma services that only trained professionals can provide.”

Michigan Attorney General Dana Nessel sent a cease-and-desist letter to the MeToo company on Aug. 29, accusing it of violating several sections of Michigan’s Consumer Protection Act.

“This company is shamelessly trying to take financial advantage of the ‘Me Too’ movement by luring victims into thinking that an at-home-do-it-yourself sexual assault kit will stand up in court,” said Nessel.

“Nothing could be further from the truth. Career prosecutors know that evidence collected in this way would not provide the necessary chain of custody.”

Lauren Hersh, a former Brooklyn sex crimes prosecutor, said that although she understands “the rationale” behind the product, she still finds it “deeply problematic.”

“There is going to be serious problems with it holding up in a court of law,” said Hersh, now the national director for anti-sex trafficking group World Without Exploitation, adding, “There’s a chain-of-custody issue and there’s not an independent examiner.”

Hersh added that victims of sexual assault treating themselves also poses problems.

“There can be serious health consequences and that person likely needs medical attention to deal with any sort of STD, pregnancy … any other injuries,” Hersh said.

In a questions page on the kit’s website, it says the company has a “multi-step plan so that the kit retains chain of custody. However, there is no guarantee that any of the evidence collected as a result of the use of this product will be admissible in court.”

The company advises that after the kit is used, it should be taken to the police or the Title IX office where an official report would need to be filed.

In a statement to The Post late Wednesday, the founder of the DIY kit, Madison Campbell, said, “Our goal is in order to ensure that the product is up to the highest standards of health and admissibility.”

“We’re looking for allies and partners to help us fine-tune this technology and to ensure that no survivor’s evidence is left uncaptured.”

Campbell said that she is willing to work with Michigan’s attorney general, as well as New York’s, “and AG’s across the country in order to create the best possible product.”

She added that the company does “not believe nor support that individuals should forgo going to the hospital after a sexual assault.”

As for the MeToo branding, Campbell said, “As a survivor of sexual assault, the MeToo movement is what encouraged me to move forward on this product. If the name of the product interferes with helping survivors, I will change the name.”

The company is based at New York University’s 370 Jay Street building, but a school spokesman insisted it has no other affiliation to the college, and added that there is “no arrangement with NYU to purchase or use” the MeToo Kit.

A post published on Medium July 25 at one point listed the company as part of the 2019 “Data Future Lab” incubator at NYU Tandon, with a quote from the lab’s general manager saying, “The MeToo Kit has the ability to bring ownership and dignity to survivors and allow them to report privately and effectively,” a cached version of the page shows. The company was no longer in the post as of Wednesday.

Additional reporting by Andrew Denney, Bernadette Hogan and Emily Saul