Does the proliferation of aid donors lead to visible changes in the world of foreign assistance? Aid provided by low- and middle-income countries, autocratic regimes and donors operating outside the Development Assistance Committee (DAC) of the OECD is gaining in importance. This article uses data on emergency aid supplied by 105 donor countries to explore the determinants of aid and the differences in allocation patterns between donor groups. Our results show that both the so-called new and traditional donors provide emergency aid based on humanitarian need and their self-interests, but we find evidence that non-DAC donors attach relatively more importance to political motives. Additionally, autocratic donors seem to favor countries rich in natural resources and to disfavor democracies. Since the timeliness of the aid delivery is crucial for aid effectiveness, we furthermore analyze which factors influence the number of days that pass after a natural disaster before a donor commits herself to provide emergency relief. With regard to aid promptness, we find DAC, developed and democratic countries to be significantly faster than non-DAC, developing and autocratic countries.