SendGrid's website is entirely unusable without zooming; often the fonts render as less than a pixel wide at normal zoom. Combined with light gray on white color scheme it makes the site a headache to use.
More amusing was the advertised blogpost last time I logged in that said using a dark theme for your email promotions was modern and would attract more interaction.
Their front page doesn't look that bad to me, but as I poke through other pages, there's definitely a lot of text at "usually reserved for legal disclaimers" font size, isn't there?
I don't use Sendgrid, so I don't know what their admin panel is like. I recall that some of the worst remaining offenders in the "gray text on gray background" category are SaaS dashboards...
More amusing was the advertised blogpost last time I logged in that said using a dark theme for your email promotions was modern and would attract more interaction.