jedreckoning's comments

On: Fin123

[jedreckoning]

fighting excel in headless runs using COM. fighting AG grid building excel apps, blowing out tons of js trying to match excel dashboards. drift between dashboard and app, endless. users accidentally over writing excel models. no version control.

decided to just re-write excel. ended up being a little bit of github for excel, faster excel using Polars lazyframe, AG grid but embedded spreadsheet (so it's the same thing the user builds), and native versioning.

ai is integrated to write plugin code, not be "copilot". code is also versioned.

just a bunch of stuff i run into coding on trading desks, tried to solve it. open source.

https://github.com/reckoning-machines/fin123_public?tab=read...

On: Fin123 – deterministic spreadsheets for financial models

[jedreckoning]

Hi HN — I built fin123 after repeatedly seeing trading desks rewrite spreadsheet logic inside application code.

Typical workflow today:

Analyst builds Excel model Developer rewrites formulas in Python / JS Application table

That rewrite step is painful and error-prone and endless.

fin123 takes a different approach: the worksheet itself is the artifact:

Worksheet spec... Compiled worksheet (deterministic artifact)... Application embeds the viewer

Design goals:

- deterministic builds - offline computation - finance-safe joins and lookups - Polars-backed table evaluation - explicit lifecycle: commit, build, verify, release

The core engine is open source (Apache-2.0) and runs fully locally.

Happy to answer questions.

On: Show HN: Understudy – Teach a desktop agent by demonstrating a task once

[jedreckoning]

cool idea. good idea doing a demo as well.