Are you a conservative who is wary of dining out while wearing your red "Make America Great Again" hat? Do you wish you knew where you could freely sport a "Trump 2020" shirt while running errands?

There's an app for that.

Earlier this month, an Oklahoma developer launched "63red Safe," described as "an app to keep conservatives safe as they eat and shop." The idea, according to founder Scott Wallace, is to "simply get these politics out of restaurants and businesses" - by gauging whether they would be friendly to conservatives.

"Reviews of local restaurant and businesses from a conservative perspective, helping (ensure that) you're safe when you shop and eat!" reads the app's description in the Google Play store.

Mr Wallace, who describes himself as a lifelong Republican, said he conceived of the idea in November, when he was out with his youngest child and considered buying "one of those MAGA hats." Then he wondered whether it would make them targets for harassment, even in Oklahoma City.

Inside a Make America Great Again rally in Chattanooga, Tennessee Show all 16 1 /16 Inside a Make America Great Again rally in Chattanooga, Tennessee Inside a Make America Great Again rally in Chattanooga, Tennessee Anti-Trump protesters gather outside of the rally Getty Inside a Make America Great Again rally in Chattanooga, Tennessee A supporter of the president waiting for the rally Getty Inside a Make America Great Again rally in Chattanooga, Tennessee Anti-Trump protesters wield picket signs Getty Inside a Make America Great Again rally in Chattanooga, Tennessee A Trump supporter outside of the Mckenzie Arena in Chattanooga prior to the President's appearance Getty Inside a Make America Great Again rally in Chattanooga, Tennessee Anti-Trump protesters gather outside of the rally with signs Getty Inside a Make America Great Again rally in Chattanooga, Tennessee A t-shirt for sale at the rally Lucy Gray Inside a Make America Great Again rally in Chattanooga, Tennessee A crowd gathers in waiting for the rally Lucy Gray Inside a Make America Great Again rally in Chattanooga, Tennessee A Trump memorabilia stand outside of the rally EPA Inside a Make America Great Again rally in Chattanooga, Tennessee Trump supporters cheer as the President arrives to the rally AP Inside a Make America Great Again rally in Chattanooga, Tennessee President Trump stands with Lee Greenwood as he sings 'God Bless the USA' to commence the rally Reuters Inside a Make America Great Again rally in Chattanooga, Tennessee A supporter listens as President Trump speaks EPA Inside a Make America Great Again rally in Chattanooga, Tennessee President Trump addresses supporters AP Inside a Make America Great Again rally in Chattanooga, Tennessee President Trump thanks Senate candidate Marsha Blackburn after her speech EPA Inside a Make America Great Again rally in Chattanooga, Tennessee Supporters of the president wield signs during the rally Getty Inside a Make America Great Again rally in Chattanooga, Tennessee Trump supporters cheer during the rally AFP/Getty Inside a Make America Great Again rally in Chattanooga, Tennessee President Trump exits the stage AP

Just a few months before, White House press secretary Sarah Sanders had been asked to leave the Red Hen, a restaurant in western Virginia, because she worked for President Donald Trump, he noted.

"I thought, 'Maybe this isn't the right thing to do,' " Mr Wallace told The Washington Post in a phone interview Monday, talking about displaying his support for Trump. "That was very uncomfortable for me. I don't want to be a nation where putting Che Gueverra on a T-shirt . . . or wearing a MAGA hat . . . makes you a target."

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So he and two associates set out to develop something like a Yelp app, one that would evaluate establishments on four questions:

- Does this business serve persons of every political belief?

- Will this business protect its customers if they are attacked for political reasons?

- Does this business allow legal concealed carry under this state's laws?

- Does this business avoid politics in its ads and social media postings?

"The questions, as you read through them, are designed to be apolitical," Mr Wallace said.

But he admits that the aim is ultimately to help identify whether businesses are "safe" for conservatives.

"The truth is, from a political standpoint - not talking religion or race or sexuality - conservatives are under physical attack," Mr Wallace said, citing an altercation in which a conservative activist was punched at University of California, Berkeley. "The best way to describe it, to me, is there's sort of a general unease among conservatives right now. And whether it's real or imagined, I don't know. . . . I want to call out those local businesses" where an attack against conservatives does or could manifest.

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Mr Wallace said the reviews will be crowdsourced and rely on "the honour and trustworthiness of the reviewers themselves," much like Yelp does.

"Fox & Friends" featured the app in a segment Monday morning, dubbing it "Yelp for conservatives." Shortly afterward, the "63red" servers crashed because of overwhelming interest, Mr Wallace said. The company accused Facebook, the source of the app's location data, of cutting it off because of its conservative politics.

"Apparently, 'Doing business while #conservative' is a real thing," 63red's Twitter account posted Monday morning. "Thanks to Facebook, where we get our location info, 63red Safe can't get any data. Our sincere apologies while we call Congress and try to break up this tech monopoly . . . "

The tweet was later deleted. Mr Wallace said that it was "a mistake made in annoyance" and that he vowed to work with Facebook to resolve the issue soon.

"Here's how I view this. There's Facebook, Google, Apple, Microsoft . . . at every one of these companies, there are 'low-level functioners,' people who have the levers and switches to get things done but aren't up there in the vice presidential level," Wallace said. He said he suspects there are "socialist embeds" operating as those "low-level functioners," who actively worked against conservatives.

"When I have a little trouble at the lower levels, they're happy to work with me at the higher levels," Mr Wallace added.

Facebook representatives did not immediately respond to a request for comment Monday.

On Monday, the ratings for "63red" on Google Play and Apple's app store hovered around 2.5 out of 5 stars, thanks to dozens of polarised reviews. Some praised its aim: "Finally, I am able to avoid places which don't respect America and US Constitution. Eat your heart out, snowflakes," wrote one user who rated the app five stars. Others promised to use it to identify MAGA-friendly establishments for a contrary purpose - "so you know what business to avoid and boycott," according to someone who rated the app one star.

Mr Wallace said he is ignoring the hate mail and "annoyed tweets" the company has received and is focusing on a bigger picture: creating apps under the "63red" umbrella aimed at younger conservatives so the brand can "be a factor in the 2020 elections, both at the local and national level."

He also emphasised that there is no hidden message or conspiracy theory behind the app's name, which he chose at random.

"Everyone asks. It means nothing at all, absolutely nothing," he said. "It's a good-looking logo. It's a unique name."