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

Software you love. Without compromise.

A boutique AI-native app factory in San Francisco. Four 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

Go on vacation. Keep coding on your Mac at home.

Visit agentgo.xzinger.com →

Your Mac stays home with your repos, your keys, and Claude Code already set up the way you like it. You go to the beach. AgentGo lets you keep working with that same Claude from your iPhone, anywhere you have signal. Kick off a task over breakfast, check on it by the pool, approve the next step from the airport. It's a real terminal, rendering properly, not a chat window pretending to be one.

And getting there takes no sysadmin work. No SSH keys, no VPN, no port forwarding. 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.

PlatformiPhone · Mac
Works fromAnywhere with signal
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.

Join the iPhone beta →

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 for two weeks. $5 once. No subscription.

Visit fax.xzinger.com →

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.

Every real fax service wants a monthly plan you'll forget to cancel. The free ones hand you a number that dies in 24 hours, and the IRS takes four business days. CatchFax is $5, once. No subscription, no account, nothing to cancel. You get 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 all fax content sent and received.

PlatformWeb
Number held14 days, private
Price$5 once
SubscriptionNone
After expiryNumber and documents destroyed
Live · Web · Free

BathroomCodes

The restroom code, before you're standing at a locked door.

Visit bathroomcodes.xzinger.com →

Plenty of cafes and restaurants lock the restroom and print the code on a receipt you already threw away. BathroomCodes keeps the codes people share, place by place, so you can look one up in seconds.

It's free, with no account and nothing to install. Search for a place by name or find it on the map. When a code works, tap to confirm it, so the next person knows it's still good.

PlatformWeb, any phone
PriceFree
AccountNone
Codes fromThe community
Kept current byUser confirmations
Our promises

What we'll never ask you for.

A monthly bill for a one-time job

You needed one fax, so you pay for one fax. CatchFax is $5, once. Nothing renews and there's nothing to cancel.

Your exact location, shared with anyone

B.Closer needs your location to work, but it never shows it to anyone. Friends only learn that you're nearby. No dot on a map, no trail of where you've been.

A setup guide

AgentGo connects your iPhone to your Mac with two logins. No SSH keys, no VPN, no router settings.

Your data, to keep forever

We hold what the app needs and nothing more. CatchFax destroys the number and every fax sent or received, contents included, after 14 days.

Pick our next app

You choose what we build next.

These are on the bench. Tap the one you'd actually use and we'll email you when it's ready. The most votes gets built first.

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