XZinger
Boutique app factory · San Francisco
XZinger LLC · est. 2026

Software you love. Without compromise.

A boutique AI-native app factory in San Francisco. Three apps so far, each one built by refusing what most software asks you to accept: a setup you have to get through, a subscription you have to cancel, a location you have to give up.

TestFlight beta · iPhone + Mac

AgentGo

Sign in on both. That's the whole setup.

You left Claude Code running on your Mac and walked out the door. AgentGo puts that session in your pocket. It's a real terminal, rendering properly, and you can read and steer it from anywhere.

Every other way to do this starts with a checklist: enable Remote Login, generate an SSH keypair, install a mesh VPN on both machines, decide how you feel about port forwarding. Six to eight steps, and a wall for anyone who isn't a sysadmin. AgentGo takes two. Log in on the Mac, log in on the phone, and they find each other. Both reach out to an encrypted relay rather than waiting to be reached, so your Mac stays behind its firewall, exactly where it is.

PlatformiOS · macOS
Steps to connect2
SSH / VPN / portsNone
TransportEncrypted relay, nothing stored
Built forClaude Code, vim, htop
TestFlight beta · iPhone
B.Closer

Know when a friend is nearby. Without showing anyone where you are.

Location sharing asks you to choose between two bad options: broadcast a dot on a map all day, or stay invisible and miss the coffee you'd have had. B.Closer removes the choice. It tells you a friend is close, never where either of you is.

You set two rings: walking distance and driving distance. When a friend you're connected to crosses into one, you both get a nudge. Your phone reports only when you've genuinely moved, so it costs almost no battery, and visibility is per-person and reversible. You can go quiet for one friend without explaining anything or breaking the connection.

PlatformiOS
ZonesWalking · driving
Shares exact locationNever
BatterySignificant-change only
VisibilityPer friend, reversible
In development · Web

CatchFax

A private fax number that waits as long as the reply takes.

Someone still needs you to fax something. Worse, they need to fax you back. A government office, a claims adjuster, a county clerk. And they'll do it on their own schedule.

The free services hand you a number that dies in 24 hours. The IRS takes four business days. CatchFax gives you a number that's yours alone for two weeks, long enough for the other side to get around to it. Then it's destroyed, along with everything it received. No subscription, no account, nothing to cancel. And when a fax lands, we read it and tell you the number you were waiting for, instead of handing you a scan to squint at.

PlatformWeb
Number held14 days, private
Price$5 once
SubscriptionNone
After expiryNumber and documents destroyed
How the factory runs

Small enough to say no.

Setup is the enemy

Most software asks you to earn the right to use it. We treat every configuration step as a bug and count them down to zero before we count features up.

AI is an ingredient, not the pitch

Models do real work inside these apps: driving coding agents, reading documents nobody wants to read. You should notice the result, not the technology.

We use all three

Every app here began as something we needed ourselves. CatchFax exists because getting one form to the IRS turned into a month of waiting, and nothing on the market stayed open long enough for the reply.

Get in touch

Using something of ours, or want to?

Beta invitations, bug reports, and arguments about which step should have been deleted first are all equally welcome.

hello@xzinger.com