In many traditions a white bird is read as peace, purity of intent and a message from the gentler side of life. Dream books often connect it to relief after a tense time.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.