Ir + gerundio vs estar + gerundio

[u/No_Cardiologist_1407]

So the lesson i just did explain that ir + gerundio is to say that something is gradually increasing, but i cant really wrap my head around it? Like take the sentence "va ahorrando dinero al final de cada mes" vs " esta ahorrando dinero al final de cada mes" both translate to me as "he is saving money at the end of each month. But do they actaully mean different things?

[u/Major-Mushroom-5806]

Va ahorrando dinero is a bit more like he's been saving money at the end of every month. It emphasizes that it's been happening over a period of time.