[thesuperbigfrog]

https://www.allsides.com/unbiased-balanced-news provides news stories aggregated from major news sites with the news sites ranked by their bias level: far-left, left, center, right, far-right

AllSides also has a mobile app that works fairly well.

As others have stated, there are no unbiased news sources. Seeing the takes from different sides shows the biases and helps you keep an open mind.

[Leparamour]

Rating modern BBC, NPR, TheHill and Axios(!) of all things as "center" is quite a leftist bias in itself.

As a rule of thumb you can say that if it's allowed on /r/politics then it fits neatly into the regressive left's small space of approved opinions.

[beardyw]

If the weatherman says it's warm today, some will say too hot, some will say too cold.

There is no internationally recognised unit of left/rightness. You will always need to apply your perceived bias to anything like this. Don't expect them to match exactly what you feel.

[Leparamour]

I agree with your analogy. I too would consider my personal opinions prudent and middle-of-the-road but unlike AllSides.com I do not run a website whose mission statement allegedly is to be transparent about media bias.