Pyrefly v1.0 is here (fast type checker and language server for Python)
ocamoss
31 points
5 comments
May 13, 2026
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Discussion Highlights (3 comments)
bbor
Funny what HN randomly misses sometimes -- this is huge news! Congrats to you and the team.
perarneng
Fun thing, today (1 hour ago) the 13:th may i was lookig for a typechecker with AI in what is popular right now because these things changes. I have been following pyrefly and ty before. Then i decided to go with pyrefly and added it. Noticed it was 1.0.0 which as odd because that is very special. How could i have missed that. Then I checked the blog and saw it was released yesterday. What a happy surprise to get a 1.0 as fresh delivery straight in to my project. Nice work!
adityamwagh
It’s a memory hog! The other day it was using 2.5GB of RAM.