Keep in mind that there is no standard white toilet color; white may vary slightly from one manufacturer to another when you compare them side by side under good light.
For a tiny chip, the different whites usually won't make a difference. If you have a large area to cover, you may have to experiment with different shades of white. Soto No. 01 Perfect White is a very "white" white, and works well with many toilets; but many standard porcelains have a blue undertone, and Soto No. 04 White Haze is usually the closest match for these.
Please note that there are many different finishes and colors of bathtubs and showers so to ensure you find the closest match please order our color chart with swatches so you can hold up the swatches to your existing color and see which is the best match. While it may be tempting to try to match the color based on the online images, because different monitors/screens show colors differently, and because of how lighting affects colors, it is best to get the physical chart rather than relying on the on-screen colors.
You can order your chart at getsoto.com/colorchart. It ships first class within 1 business day, so you should receive it within 3-5 business days (occasionally, USPS runs slow, so if you haven't received it after 10 days, please contact us so we can send out a replacement). Make sure you enter all pertinent information (such as apartment number) to ensure fastest delivery.
When you get your color chart, it will be best to view the swatches against the current color using the brightest natural light available (open any curtains or blinds, try to do this at midday). If you tape the closest colors to your wall and stand back, you should be able to get a better visual for contrast or lack thereof.