Mobilis Pass
Do you like walking ? You are certainly right, walking around in Paris will allow the most beautiful discoveries. And you won't need public transportation.
But, if you ever have to use public transports many times just one day, you might want to use the Mobiles Pass, practical and cheap.
It's available for a day, from midnight to midnight. it allows you to get unlimited travels in chosen zones.
You can get access to every public transportation available in Ile-de-France : Subway, RER, Bus, Tramway and train - except for some special lines.
Here, you'll find all the informations on Mobilis Pass.
Do you want to buy single one-way tickets ? inside Paris, click here... or between two stations in the Ile-de-France, click here...
Paris Visit Pass
This pass only exists for tourists.
A sort of magnetic ticket, the Paris Visit Pass allows you to get access to any kind of public transportation : Subway, RER, Bus, Tramway and Transilien SNCF.
It's available 1, 2, 3 or 5 consecutive days. It gives you unlimited travels in Paris (Zone 1 to 3) or Paris and Ile-de-France (Zone 1 to 5, with access to airports including Orlyval, Disneyland Paris, and Versailles's Castle).
Thanks to Paris Visit Pass, you'll also got some benefits with some of their sponsors.
You may buy it in any subway station or online here.
Here, you'll also find all the informations necessary on Paris Visit Pass.
Do you want to buy single one-way tickets ? inside Paris, click here... or between two stations in the Ile-de-France, click here...
This pass is usually not for tourists but you can still buy it.
It's a card (which costs 5€). Once you have the card, you can upload the Navigo Discovery on it. It also allows you to get access to any kind of public transportation : Subway, RER, Bus, Tramway and Transilien SNCF.
You can choose a package that will last 1 day, 7 consecutive days or even a month. The weekly fixed price is available from Monday to Sunday. You can buy from Friday the preceding week.
Navigo Discovery allows you unlimited traveling in Paris (Zone 1 to 3) or Paris and Ile-de-France (Zone 1 to 5, with access to airports including Orlyval, Disneyland Paris, and Versailles's Castle).
You can buy it in any subway station, or at the carriers's counters, or to any approved dealers, without having to complete a file. It's not available online.
Here, you'll find all the informations on Navigo Discovery et aussi ici.
Do you want to buy single one-way tickets ? inside Paris, click here... or between two stations in the Ile-de-France, click here...
Paris Visit Pass or Navigo discovery ?
OR 
???
It's very hard to compare those passes because there are too many parameters, which are different from one formula to another...
For example :
- Children. Children from 4 to 12 years old get a cost reduction with Paris Visit Pass, but not with Navigo Discovery.
- Period of use. Paris Visit Pass can start on whichever day of the week, when Navigo Discovery has to start on a Monday.
- Duration. Navigo Discovery lasts 1 to 7 days (even a month if you want), when Paris Visit Pass lasts 1, 2, 3 or 5 days (I wonder why it doesn't last 4 days...).
- Zones. Paris Visit Pass lets you chose between Zones 1 to 3 or Zones 1 to 5. Navigo Discovery lets you chose between all the zones, Zone 2 and 3, 3 and 4 or 4 and 5.
- Picture. If you want Navigo Discovery you'll have to give a photo ID (size : 3 cm x 2,5cm), you want have to give one for Paris Visit Pass.
- Card's price. Besides the cost of the package, you'll have to pay 5€ for Navigo Discovery's card. You won't have to for Paris Visit Pass.
Finally, generally speaking, Navigo Discovery is, for many stays (not all, that would be too easy...) much less expensive than Paris Visit Pass. For example (applicable prices in September of 2018) :
- The price for Navigo Discovery that includes every zones is 22,80€ a week.
- When a Parisi Visit Pass 5 zones for three days costs 53,75€ (26,65€ for three zones)
However be careful, to appreciate the difference, you must consider your day of arrival : if you arrive on a Saturday for a stay of three days, you'll have to pay for Navigo Discovery twice (once for the week of your arrival, once for the week of your departure)...
Finally, both packages have at least one common point : they don't give you access to tourist buses (OpenTour, Cars Rouges...).
You'll have to research it and see which one suits you the best. To conclude, we may say that :
- If you prefer an easy use, Paris Visit Pass might be the one for you ;
- If you prefer lower prices, Navigo Discovery is often (not always...) better.
