Hey everyone! 👋 I built Synapse because I was frustrated with existing file-transfer tools they either require accounts, cloud storage, frameworks, or have bloated dependencies. I just wanted a dead simple way to move files between computers on the same network without any friction. The aha moment was realizing that Python's standard library has everything you need: raw sockets, threading, file I/O. No pip installs. No frameworks. Just 400+ lines of pure Python that does the job. My process evolved like this: 1.Started simple- just basic file upload/download over TCP 2. Added verification- SHA-256 checksums so corrupted files would never slip through silently 3. Real-time feedback- progress bars because watching a file transfer with zero feedback is painful 4. Extended it- group chat and batch uploads came later because i felt the vibe to add more features 5. Optimized for speed — discovered TCP socket options (TCP_NODELAY, SO_SNDBUF/RCVBUF) that made a huge difference in perceived latency The hardest part wasn't coding it was the protocol design. Getting length-prefixed framing right so messages don't merge or split during transmission took more testing than I expected. Would love to hear if anyone uses this on their LANs or deploys it on servers. That's the real test.

Synapse

Fast P2P file transfer & chat. Zero dependencies.

Fast P2P file transfer & chat. Zero dependencies.