Tools for developers, data people and small teams.
Biz59 LLC is a small company in New York. We build and run nine products, most of them with one sign-in, and we write about what we see in software, AI and startups.
A database client, plus free data tools in the browser.
iPaid, i Owe: track what you owe and what is owed to you.
Security tools for small sites and teams, with one sign-in.
Short links, QR codes and page-view tracking.
An email router for apps, developers and bots.
Privacy policies, terms and consent records for apps and sites.
Website, policies, support pages, sign-in and cloud sync for your mobile app.
Offline-first cloud sync for your app's data, with sign-in for your users built in.
Our build agent: describe your app in a chat and watch it get built. Coming soon.
More articles
Klarna, Duolingo and the AI-first memo: what happened after companies replaced people with AI
Klarna's chatbot did the work of 700 agents, until the CEO said quality had dropped and started hiring people again. Duolingo, Shopify and Australia's biggest bank have their own versions of the story. Here's what the reversals have in common, and where a small business should put agents and where it should keep people.
4-hour build log #1: an email API with sign-in and card payments, from the first commit
On the evening of 4 October we built email59.com, a small email API for developers and bots. Here's the git log, hour by hour: what shipped, what broke, and the one thing that didn't fit in four hours.
Small teams, big revenue per head: how investors read AI-native startups in 2026
Startups now reach real revenue with a handful of people, and revenue per employee has become a headline number. Investors look past it too, at gross margins and at who actually gets funded.