Preheat your oven to 350°F (175°C).
Prepare a 10-inch ungreased tube pan.
In a large mixing bowl, beat the egg whites on medium speed until foamy, about 1-2 minutes. Add cream of tartar and continue beating until soft peaks form.
In a medium bowl, whisk together gluten-free flour, 1 cup of sugar, baking powder, and salt.
Gently fold in vanilla and almond extract, then fold in the flour mixture gradually.
Pour the batter into the prepared tube pan and smooth the top. Bake for 35-40 minutes until golden brown.
Remove from oven and invert the pan onto a wire rack to cool completely.
Run a knife around the edges to release the cake from the pan.