Agent Arnold

Details

External ID

47599944

Source

HN

Company

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Product

Agent Arnold

Website domain

agent-arnold.app

Launched

April 1, 2026

Cohort

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Upvotes

5

Upvotes percentile

0.11182519280205655

Tags

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Fetched at

Sept. 7, 2026, 9:26 p.m.

Updated at

Sept. 7, 2026, 9:26 p.m.

Description

Agent Arnold is a gym tracker with a built-in AI coach. Here's how I use it:- "this exercise hurts my shoulder at the end of the movement, remind me proper form and cues"- "how should I modify my workout today based off last week's reps and weights"- `/generate` a bouldering-focused workout routineThe app is free, your data is fully exportable (no walled-gardens), and there's an anonymous global leaderboard for motivation, including a "Dishonored" shameboard for anyone caught faking their numbers.I decided to 100% vibe-code this project, a part of it is halluci-coded. I purposely haven't touched a single line of code, though I've reviewed most of it. The project started as just my own workout split, but friends wanted to try it so I added routines, then feature requests started coming in and I basically just forwarded them to my CLI agents.Vibe-coding is far from perfect, but since I'm a daily user of my own app I catch bugs immediately, sometimes literally in the gym while SSHing from my phone between sets.---Tech stack: - FastAPI + SQLite on a Linux box - React PWA (works offline) - AI coach powered by Claude via Anthropic API - Telegram OAuth + Resend magic-link auth - Sentry for error tracking, Foursquare Places for gym locationThe whole thing was built with Claude Code. Vibe-coded with Claude, and the AI coach is also Claude. It's Claude all the way down.https://agent-arnold.app/---What do you hate about your current fitness tracker? I might fix that.

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