I’ve made a video showing how my Moscow Metro map transformed from version 3 to version 4:

After the video has loaded (16 MB), you can scrub it.

Here is one lesson I have learnt working on Envy, a cool Hawaiian car rental.

On a car page, there is a yellow price tag with a “Rent” button:

A typical way to get to this page is the following. On the front page a client chooses the desired rent dates, clicks “Find”, then selects from available cars. It is possible though, that by the time the client selects a car, somebody else books it already. Or the client reloads the car page in a couple of days, and the car is gone. One way or the other, a client can end up on the car page with the pre-selected rent dates, for which the car is no longer available, and they won’t be able to rent it.

Also, on the front page we show the best cars we have. A client can click any of them and get to its page, having skipped the dates selection altogether. In this case, the dates won’t be specified, and the client also won’t be able to rent the car. We didn’t want the client to be confused by the disabled “Rent” button, so in addition to the front page, we put the dates selectors to this price tag itself.

I presented the design of the car page to Ilya Sinelnikov (co-creator of Envy) and was talking about the price tag.

I said, we didn’t like that the “Rent” button is disabled sometimes: the website is there for the people to rent cars. But how can you rent a car which is taken by someöne else? At first, we thought that we could automatically change the dates to the nearest available ones. But it can result in a disaster: what if the client doesn’t notice the change, pays for the rent, comes to pick-up the car, and learns that we don’t have it? I said, we were also thinking about some tool to explain the problem and help the client change the dates, but there was no chance to make it on time for the website launch. So, I said, for now I suggest just disabling “Rent” the button in this case.

Also, I said, a car could become unavailable while the clients looks at its page. Therefore we needed to re-check the availability after the “Rent” button is pressed, and inform the client of a problem, if it occurs. For now, I said, we’ve designed this error page. In the future it would be better to suggest a date change or offer another car. But this is also not going to be implemented by launch...

Ilya interrupts: “To hell with the dates, let’s just make the button always enabled.”

What? There can be no car for the client when they come.

“The client is willing to pay us money”, Ilya says, “and you prevent them from it by disabling the button. This is inefficient. Let them pay, and we’ll sort it out”.

And then Ilya enlightens me. Envy as a business must be able to sort this out anyway. It is possible that a booked car is not available for the client, say, if the previous client breaks it, or whatever. In order to make the client happy, Envy offers them a better car for the same price.

For Ilya, it all appeared as if I was trying to stop his client from paying him money with my UI. But from the business perspective my UI consistency hurdles are insignificant. Dates have accidentally overlapped? Oops, sorry, here’s a Mercedes instead of a Ford, no big deal. In the worst case, if there’s a super-picky client who won’t take anything but the very car they’ve chosen on the website, we’ll return the money and apologise.

So we made the “Rent” button always enabled. If by the time the client clicks it, the car becomes unavailable for the selected dates, the manager gets a notification about a problem, and it is their job then to contact the client and agree on a new car or dates. And if the dates are not selected at all, clicking “Rent” moves the focus to the dates fields and opens the calendar, so that the client knows what to do.

Principle: the “Buy” button should always work.

We have recently published the work we have done for Envy.rent, a cool Hawaiian car rental:

• The logo
• The website
• Hot prices font

Check it out.

Here is one detail that brings me joy. It’s the calendar where the client selects the rent dates:

Notice how the sticky part works. The heading moves up and fades out, the weekdays come to stop, and the ruler under the weekdays stretches to touch the edges, thus separating the sticky part from the moving part. There is also a nice time slider.

The calendars for start and end dates drop down simultaneously. This is counter-intuitive, but very convenient.

In user interface design, we define a Karaoke button as a button which exists solely to highlight the existence of some feature, often a gimmicky one. The button is visible on a product pictures or screenshots, so it’s more likely that the users will notice it and buy the product.

Since Karaoke buttons do not solve any user problem, they do not make a product better. Actually, sometimes they make it worse, for they occupy space which could have been used better. But apparently they help sell the product.

On top of that, a particular class of Karaoke buttons is worse still: those that make product universally better when you press them. An example would be my air conditioner’s Quiet button. If it’s technically possible to do the same job quietly, why not just do it so all the time?

Check out this new Ekaterinburg metro map:

Designed by Pasha Omelyohin, directed by myself.

A large metro network works like teleport: people don’t care how it gets you from point A to point B, it just does. In London, Paris or Moscow metro maps do not show the surface geography: there is no room. And for many people, the metro map is the map of the city.

But that’s not the case for the small metros. Designing a map for a small metro this way makes no sense:

This does not contain any new information compared to a plain list of stations. The need to simplify and get rid of surface details only occurs when the complexity of the map gets in the way of finding your route. Ekaterinburg does not have this problem.

When there is one metro line, there is no teleport effect. It is very important to show how the metro is connected to the surface:

That’s why we list the routes of buses, trolleybuses and trams, show metro exit locations, nearby streets, parks, the river Iset, railway and coach stations: