On a similar note: One thing I've found interesting about VISA lists and passport usefulness rankings is that it has no bearing on the experience you'll have coming into a country.
For example, the German passport is supposedly soooo much better than the US passport, but diving into it you see that a few countries have slightly different status designations for the two. Where the status designation for the German one being a slightly better one.
But when you get to the airport in those countries, the US passport has the easier route with the automated immigration. While the supposedly better passport with better status still busses you through the line with the hoard of the newly minted Chinese middle-class with the humans slowly evaluating everyone.
I think the country-specific nuances between status designations are hard to rank, if it is functionally similar in all capacities once you get in the country. And the experience/treatment getting into the country isn't listed at all.
I traveled with a US fellow to several countries outside of respective regions (all Middle East except Iran and Syria), Malaysia, Indonesia, Singapore, Australia, North and West Africa - among others and I cannot remember our passports (mine is French) to be treated differently (when the visa or not visa conditions were the same of course).
What is this "automated immigration" you mention?
Example for comparison: visadb for US->China only says "Visa required to travel".
The expertflyer pull goes into detail about the extended visa-free "transits", exceptions for some visa-on-arrival tourist programs, requirements for also entering Tibet, requirements for yellow fever vaccination, requirements for children traveling with an adult, etc.
 While many non-US countries have the concept of visa-free transit for connecting from one international flight to another, they usually require you remain in the airport the entire time. In certain cities, China allows you to leave the airport, stay in a hotel and see the city for 3-6 days depending on which city you "transit" in, so long as the origin of your immediate inbound flight and destination of your immediate outbound flight are not the same country. Some airlines infamously have trouble with this, since their agents incorrectly enter a destination of China (due to a planned multi-day stay) instead of a transit of China, and get back a result requiring a visa.
Most recently, I've seen AA passengers complain due to the popularity of a mileage run LAX-PEK-NRT-LAX, where the passenger spends a couple days in Beijing and never leaves the airport in Tokyo. From the perspective of the Chinese policy, this is a valid round trip to Tokyo with an outbound connection in Beijing, requiring no visa for the transit of China. AA agents try to enter as a round trip to Beijing with a return connection in Tokyo, requiring a visa to visit China.
Though I'm curious... exactly how cheap is 100% cheaper? For example:
Northern Mariana Islands
VISA FREE FOR 30 Day(s)
Compare to Norway:
Accomodation is 100% cheaper
Restaurants are 38% cheaper
Transportation is 100% cheaper
Can you explain little bit more :) I am the one who created the tool on my own so would like to fix the issue you are pointing to :) Cheers
Minor quibble - I checked for Philippines as I'm from UK and go there quite a lot. The DB says the visa exemption is 21 days - it's actually 30 days.
Where do you get your data from? Trawling embassy sites? That's quite a lot of work as the information does change. Take Thailand for example - they have made so many changes over the years it's hard to keep up with - even the border staff often don't know what the latest regulation is! :)
Same goes for "Åland Islands" which are part of Sweden, and they certainly don't require a Visa from a UK citizenship.
Also, I'm pretty sure Faroe Islands, Guernsey, Isle of Man and Jersey don't require a Visa from a UK citizen.
Not sure about Åland, you definitely don't need a visa from UK (or Ireland) to visit Isle of Man, and you're likely right about the others too.
and I am not going through list of 200 countries to correct wrong data ind atabase
also by my experience with prices, those restaurant/transport/accommodaion prices are completely unrealistic, you telling me Cambodia has slightly lower prices of transportation thn EU country? only someone who never been to Cambodia and EU can say that
Wikipedia color codes it as "admission refused": https://en.wikipedia.org/wiki/Visa_requirements_for_Israeli_...