Tech-friendly Cambridge is just the latest city to mull a clampdown on wildly popular Internet-based car services, with a heated licensing board hearing last night that pitted webbies vs. cabbies over tough regulations that would unplug Uber in the city that is home to the Kendall Square electronics research hub.

The latest regulatory challenge to transportation apps drew dozens of supporters of Uber and Lyft — a similar service that uses cars adorned with furry pink mustaches — as well as Boston and Cambridge taxi drivers fearful of losing business.

“We will do everything and anything to help our fellow brothers kick (the app services) out,” said Chando Souffarnt, one of several cabbies sporting anti-Uber stickers. “This is unacceptable.”

But Gordon Gossage, a Lyft driver who says he has made more than 2,300 trips, said cab drivers are just trying to avoid competitors. “They don’t have the constitutional right to be protected from competition,” Gossage said.

Uber, which connects third-party contract drivers with riders via a smartphone app, has faced scrutiny all over the world. Just last week, thousands of London taxi drivers protested the service. Similar challenges have been mounted in Seattle, New York City, Washington, D.C., and Colorado.

In Boston, taxi drivers leaned on their horns for more than an hour last month as they circled Uber’s Boston headquarters near South Station. That prompted Mayor Martin J. Walsh to push his transportation task force for a quick resolution in the Uber-versus-taxi war.

The Cambridge licensing commission has proposed draft regulations Uber said would put it out of business there. They include rules on how technology can be used to dispatch and meter fares — Uber’s lifeblood — and requiring a $50 minimum fare for its service. “It would effectively prohibit any other form of innovative transportation options, including requesting a ride on-demand from the Uber app,” said Meghan Verena Joyce, general manager of Uber Boston.

The commission said the draft regulations were “a preliminary conversation,” according to commission chairwoman Andrea Jackson. “We do not want to put anyone out of business,” said Elizabeth Lint, the panel’s executive director.

Still, Uber users took shots at the proposed crackdown. “This kind of Luddite regulation sends a dangerous message to startups — that this is a city that hates innovation,” said resident Joel Fleming.

Uber has been growing at a breakneck pace, and recently raised $1.2 billion in new investment. That cash infusion valued the company at $17 billion. That round of funding was led by Boston-based Fidelity Investments.