The Divine Soul sorcerer (Xanathar's Guide to Everything, p. 50) gets the Favored by the Gods feature at 1st level:
Starting at 1st level, divine power guards your destiny. If you fail a saving throw or miss with an attack roll, you can roll 2d4 and add it to the total, possibly changing the outcome. Once you use this feature, you can’t use it again until you finish a short or long rest.
Does the bonus to saving throws from Favored by the Gods apply to death saving throws as well?