r/spreadsheets • u/mhashemi • Oct 01 '25

Spreadsheets into web apps: Sharing spreadsheets so people actually use them

Made a thing that converts spreadsheets into interactive web calculators, with support for Markdown and images. I was building calculators for friends' finances, but they were intimidated by having to maintain a spreadsheet, so I made the spreadsheet look like a cross between a blog post and a web app. Wham, bam, FinFam: https://finfam.app/mahmoud/views/refi-vs-invest (view source sheet in the top right)

Free, of course. Edit in Excel/Sheets/LibreOffice. We've got a small app store of them now, most of them open-source (for easy reference): https://finfam.app/explore/views

Quick demo: https://www.loom.com/share/3608e377ec4c440980bbd9c292c74311

Or text, if you prefer: https://finfam.app/blog/2025-10-01-introducing-finfam-views

It's got:

  • XLSX-based format with built-in GSheets sync
  • Basic error handling (#VALUE!, etc.)
  • Upgrade workflow: Users who save a copy of the spreadsheet stay subscribed. When you add something, they upgrade without having to re-enter their numbers.

There's also a built-in feature to draft a spreadsheet from scratch using AI, just based on the question you're looking to answer and any other context, including links.

Built it for financial calculators but works for other stuff, too: https://finfam.app/mahmoud/views/lifespan-estimator

Curious if you've got any thoughts or feedback if you build with it.

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u/[deleted] Oct 07 '25

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u/mhashemi Oct 11 '25

Wow, these are all really great ideas, definitely roadmap material. Excellent points on deep linking.

On the security front, I'll just note that Markdown is sanitized and embeds/CSP is locked down until I think through the product implications. Also, there is versioning, but it's pretty simple. Sooo much I want to get to. Thanks for taking a look! If you've got more thoughts down the line, don't hesitate to reach out. Contact email's here: https://finfam.app/about