SHA-256 · 24 to 256 bits

Two inputs. The same hash.

A full SHA-256 collision would take longer than the age of the universe. Hasha shows how close your iPhone can get: pick how many leading bits must match, and it searches on every CPU core or the GPU.

Free · iPhone and iPad · iOS 15.5 or later

Hasha searching 64 bits on the GPU: 2.05 billion hashes so far, 306 million a second, about 5.38 billion expected.

Collision found after 2.36 million hashes: the bit grid with the first 40 bits lit, both inputs and their matching hashes.

Watch the search
A live count of hashes, the speed, and how many to expect. Up to 48 bits finishes in seconds. 256 bits never finishes, and that’s the point.
See the collision
A grid of the 256 bits shows which match. Both inputs, both hashes and the salt are there, and a tap copies any of them.
Rerun any search
Every search has a seed. The same seed and settings find the exact same collision, after the exact same number of hashes.
Built for the GPU
Parallel collision search with distinguished points, so thousands of Metal threads search at once with little memory. Pause any time; it picks up where it left off.

Hasha settings: bits to match from 24 to 256, GPU or CPU, and a seed.

Private by design

No account, no ads, no tracking, no network. Every hash is computed on your device, and nothing leaves it. Privacy

Hasha is open source under the MIT license. Read the code on GitHub, including how the search works.

Two inputs. The same hash.

Watch the search

See the collision

Rerun any search

Built for the GPU

Private by design