Dealerships and private individuals have plenty of online options of where to post vehicles for sale. The team at letgo is celebrating a milestone built since its marketplace launch back in 2015.

On Tuesday, letgo — an app to buy and sell locally vehicles and a host of other items — announced that its users have listed almost 25 million vehicles for sale during the past four years, mostly in the U.S.

The company explained the news is a major milestone letgo as it continues to expand its footprint in the secondhand auto market. letgo said users add up to 1.1 million vehicles every month to what has become one of its most active categories.

Officials highlighted buyers and sellers send each other up to 42 million messages monthly about vehicles for sale, and about 2/3 of vehicle listings receive interest from at least one buyer in just the first 24 hours.

letgo, which passed 100 million downloads worldwide last summer, has become one of the top e-commerce destinations in the U.S. and elsewhere by making it extraordinarily simple to buy and sell secondhand in your own neighborhood. Vehicle shoppers, for example, can filter searches by make, model, mileage and many other details. They can also chat instantly with sellers without leaving the app.

A growing number of dealerships across the U.S. use the company’s letgo PRO platform to seamlessly list — and automatically sync — their inventory and reach tens of millions of consumers who use the marketplace every month. With one tap, shoppers can message or call nearby dealerships about their listings, which are easy to spot thanks to a “letgo PRO” badge.

“Whether they’re selling an SUV or an iPhone, tens of millions of people use letgo for the same reason because we’ve built a new kind of marketplace with intuitive technology and radical simplicity,” letgo cofounder Alec Oxenford said.