On online life insurance comparison you just have to answer to a few questions to get an approximative price (usually as a chart) from many insurance companies. The online life insurance comparison services claim to guarantee your privacy. So, no one will try to sell you life insurance later. Anyway take care to do not click at any "Send me insurance news later" or other kind of buttons you can find at these websites.
Most of this comparison websites offers different chart methods to compare the rates, quotes and prices.