For Python, there's Bounter, "Efficient Counter that uses a limited (bounded) amount of memory regardless of data size." https://github.com/RaRe-Technologies/b

For Python, there's Bounter, "Efficient Counter that uses a limited (bounded) amount of memory regardless of data size." https://github.com/RaRe-Technologies/bounter https://github.com/RaRe-Technologies/bounter Apart from HyperLogLog, Bounter implements a bunch of other nifty (fast) approximate counting algorithms like CountMinSketch.