Synapse lets your phone talk to the models running in Hydron on your computer. Ask on your phone, your PC does the thinking, and the answer streams back word by word.
The models never leave your PC. Your phone is just a window into them.
No Hydron server sits in the middle. If your computer is off, Synapse doesn't work — and that's the point.
Once
In Hydron on your computer, turn on Phone pairing and press Pair a phone. Type the code it shows into Synapse. The two devices now know each other for good.
Every time, automatically
Open the app and it finds your computer by itself and reconnects quietly. It remembers exactly which computer it paired with, and refuses to talk to any other machine claiming to be it.
Whenever you like
Pick any model installed on your PC and talk to it. Replies stream in live, and you can switch models or stop a reply at any point.
Lots of home, office and guest networks deliberately stop devices talking to each other, and PC security software often blocks incoming connections. Most apps just fail there. Synapse switches to Bluetooth and keeps going.
Same network: the phone finds your PC automatically and connects over Wi-Fi.
Both routes carry exactly the same end-to-end encrypted conversation. Neither is the "less secure" one.
Let Synapse pick automatically, or pin it to Wi-Fi only or Bluetooth only in the app's settings.
Pair your phone and PC once in your system's own Bluetooth settings. Synapse only reaches a computer you've already paired.
Everything you'd expect, running on the models installed on your PC.
Everything between your phone and your computer is encrypted, over Wi-Fi and Bluetooth alike.
After pairing, the phone remembers your computer's unique identity. If anything else pretends to be it, the phone refuses to connect and tells you — so nobody can sit in the middle and listen, not even while pairing.
Until you switch Phone pairing on, your computer isn't listening to the network at all.
It can list your installed models and talk to them. It can't run coding agents or commands, download anything, or touch your files. Even a stolen phone can't do more than chat.
Remove a phone instantly from your computer's settings, or unpair from the phone itself.
There's no sign-up and no Hydron server. Your chats stay between this phone and your computer.
Synapse's Settings screen lets you pick a theme (including a light one), an accent colour, text size, how round the message bubbles are, and which connection to prefer. Try a few here.
No. The models run on your PC, so your computer needs to be on with Hydron running. Nothing is stored or processed anywhere else.
No. There's no sign-up and no Hydron server. Pairing is done directly between your phone and your computer.
Many networks stop devices from talking to each other, and security software on the PC can block incoming connections even when Windows Firewall allows them. Pair your phone and PC in your system's Bluetooth settings and Synapse will use Bluetooth instead.
A phone can only list your models and chat with them. It can't run agents or commands, download anything, or open your files. You can also remove the phone instantly from your computer's settings.
The code expires after 5 minutes, works only once, and locks after 5 wrong tries. After pairing, your phone only trusts your computer's identity.
Synapse is an Android app.
Download the APK on your phone and open it. Android will ask you to allow installs from your browser or file manager the first time; allow it, then tap Install. To check the file, its SHA-256 is 26c354b78fcd41dd1967a015c0187a821ebd7e8499506048da2160e272bec3ed.
Install Synapse on your Android phone and Hydron on your Windows PC, turn on Phone pairing in Hydron's settings, and you're chatting in under a minute.