Tools for developers, data people and small teams.
Biz59 LLC is a small company in New York. We build and run eleven 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.
A whiteboard that also draws the diagram from your outline.
Markdown notes and documents that look good on screen and on paper.
More articles
After the outage: what a small SaaS publishes, and when
Customers forgive an outage more easily than silence. The order of things a small SaaS publishes during and after one: the first status update within half an hour, updates on a timer, the customer email, the one-page write-up a week later and credits applied without a claim; with wording to copy and what Atlassian, Cloudflare and GitLab did in public.
Your AI feature reads customer email: prompt injection tests a small vendor runs before shipping
When an AI feature reads email, documents or web pages, strangers write part of its prompt. What indirect prompt injection is in plain words, what happened with Microsoft 365 Copilot and Slack AI, ten tests to run in an afternoon with a canary, and what to limit when they fail: rendered links, silent actions, tools on the reading step and data scope.
The wrapper question: what seed investors ask an AI startup about defensibility in 2026
"Isn't this just a wrapper?" is asked in nearly every AI seed meeting. Where the question came from (a16z, Jasper, Sequoia), why Cursor changed how it is asked, the four answers that land (workflow, switching cost, distribution, a real data loop), the ones that lose the room, and the numbers a founder with a few dozen customers can show.