51% adoption. #1 fully homomorphic encryption library.
Lattica's 2nd FHE Landscape Survey (16 April 2026) of cryptographers, engineers, and researchers ranks OpenFHE as the most widely used fully homomorphic encryption library, ahead of TFHE-rs (33%), Lattigo (21%), Concrete (18%), HeaAN (13%), HElayers (10%), SEAL/TenSEAL (10%), HELib (8%), and Poulpy (5%).
OpenFHE is the open-source FHE library I co-authored, the successor to PALISADE. The signal is strengthened by the fact that Lattica itself builds a competing commercial FHE library (listed in the same survey under "proprietary library, 15%"), so this is an independent measurement rather than a self-report.