We are developing carpool app. Does the language reflect politeness and accuracy in intension?

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  • Km (kilometer) is a unit, not a quantity. Therefor you cannot use sentences like "buy kilometers", or "exchanging km". Commented May 14, 2014 at 7:46
  • km in our context is quantity. People exchange km as they drive each other. We can redeem km for cash. Please suggest.
    – Siddharth
    Commented May 14, 2014 at 7:49
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    How can km be a quantity? 1 km = 100000 cm. Now consider the following sentences: "I have a very large amount of centimeters", "Please give me you centimeters", "I would like to exchange my centimeters for cash". That does not make sense. The quantity you are looking for is travel distance! Commented May 14, 2014 at 12:26
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    Also, please don't ever use "Ok". It is not OK to use "Ok". In the worst case I am OK with "Okay", but never "Ok". Commented May 14, 2014 at 12:29
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    The difference is that "reputation" nor "money" are units. Units are: km, kilogram, km/h, psi, Liter,... Reputation and money can be considered as a quantity. Kilometer cannot. Commented May 15, 2014 at 6:27

1 Answer 1


I wouldn't use the word "mandatory"; "need" is better. Also, I'm not sure what the first alert about the KM is even supposed to convey to the user, so it's hard to give any suggestion on it.

Here are my suggestions for the other three alerts:

Modified alerts for Siddharth

Also, if the user must have a Home Location setup for the app to work properly, you may want to have them set that up upon the first launch of the app, not tell them they need to do something when it doesn't work. Give them a screen when they start the app up for the first time to input their Home Location.

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