Tenno – Markdown and JavaScript = a hybrid of Word and Excel
Tenno is a web app that lets you create Markdown documents that can include computational cells. You can think of it as a mix of Word and Excel, some sort of "literate programming" environment. This is still an early version but I wanted to get some feedback from HN on what could be nice features to add. Check out the Docs and examples page, it has a ton of (in my humble opinion) cool stuff! Why did I build this? I was building some estimation for cloud costs in Google Sheets and I quickly ended up with a mess. I realized that if I wanted to analyze how a certain thing changes wrt to…
In plain words
Tenno is a web application that combines Markdown documents with computational cells, functioning as a hybrid between word processors and spreadsheet software. It enables users to write formatted text alongside executable code, making it suitable for analysis, calculations, and documentation in a single environment. The tool is designed for those who find traditional spreadsheets unwieldy for complex computational tasks, offering features like function definition and data visualization across multiple variables.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Tenno is a web app that lets you create Markdown documents that can include computational cells. You can think of it as a mix of Word and Excel, some sort of "literate programming" environment. This is still an early version but I wanted to get some feedback from HN on what could be nice features to add. Check out the Docs and examples page, it has a ton of (in my humble opinion) cool stuff! Why did I build this? I was building some estimation for cloud costs in Google Sheets and I quickly ended up with a mess. I realized that if I wanted to analyze how a certain thing changes wrt to multiple variables by plotting it, I had to create a bunch of copies of data and copy my formulas everywhere... a SWE nightmare! Tenno simplifies this because you can essentially define a function you are interested in, and only the analyzing it using plots that explore various dimensions. BTW, you can also use Tenno to build dashboards by pulling data from APIs, checkout the weather data example.
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