Uber and Lyft (available only through an app) are usually available, but they can be slow to show up in the middle of big events. Expect the fare to be slightly lower than standard taxis until there is an increase in prices (which is often the case). Uber and Lyft are ready to take you to and from New Orleans International Airport, in and around the French Quarter and MidCity and anywhere else you need to go. In other threads I have seen that NOLA taxi drivers know how to overcome the confusing port situation, but rideshare drivers may not.
If you're planning a trip to New Orleans and you're not interested in the expense and hassle of renting a car or using a traditional taxi service, you should consider Uber and Lyft. Taxis abound in New Orleans and, except during the busiest hours (Mardi Gras and Jazz Fest), can be easily taken on the streets of the French Quarter and in some parts of the Central Business District. Uber is an alternative to a taxi, a system that uses local drivers in their own vehicles to quickly get you where you need to go.
