Portfolio of my works

Metrics for things
you care about

Cosmometrics is a one-person studio. I design, build, and ship every app here: golf, snow, fitness, focus, and a couple of utilities. The apps run without internet access, and without needing to signup for accounts.

>8Apps shipped

5iOS

1Android

>3Web

Selected work

Selected mobile apps, and then web apps.
Tap any screenshot to see it full size.

Golf Tracker

GOLF: AI GPS Tracker

iOS Live

A GPS rangefinder and shot logger that doubles as a caddie. Record every shot from where you stand, and the app learns your real distances club by club, then tells you what to hit next.

Bird's eye view with live distance to the pin
AI caddie that recommends a club from your own recorded shots
Gapping analysis: distance average and range for every club
Custom editable bag from mini-drivers to lob wedges by loft
Hole-by-hole scorecard and logbook
GPX data import and export

App Store

Golf Tracker showing 119 yards to the pin on a satellite hole view — Live distance to the pin

AI caddie recommending an 8 iron for a 130 yard shot — The caddie picks a club from your own shot history

Ball marker on the map showing club and distance, tap to edit — Tap the ball marker to edit a shot

Club picker with large buttons for every club in the bag — Big buttons to log the club you just used

Shot editor with delete, edit club, and update location actions — Delete, edit club, or move any recorded shot

Your bag, with average distance and standard deviation per club

Club chooser with woods, hybrids, irons and wedges by loft — Customize your bag

Round summary with total shots, putts, and a hole-by-hole scorecard — Round summary and hole-by-hole scorecard

Logbook of past rounds with scores, dates, and a GPX export action — Logbook of past rounds, each exportable as GPX

Data import and full logbook export options — Import a round, or export the whole logbook

In-app how-to explaining the seven-step recording flow — Simple how-to

A full hole traced shot by shot across the fairway — The full hole, traced shot by shot

Snowboard & Ski Tracker

POW RIDER: Snowboard & Ski

iOS Live

Session tracking for the mountain. It counts your runs, measures vertical, and lets you replay the whole day as a speed-colored trace you can scrub through minute by minute.

Live dashboard: speed, altitude, run count, vertical, descent
Speed-colored GPS trace over satellite or terrain maps
Altitude and speed charts
Searchable session history and summary
High quality data export

App Store

Session dashboard showing 32.7 mph max speed, 10382 ft max altitude, 12 runs — Dashboard: speed, altitude, runs, vertical

Speed-colored GPS trace of a day at Brian Head over satellite imagery — Speed-colored run trace over satellite

The same run trace drawn over a terrain map — The same trace on the terrain map

Altitude and speed line charts for the session with a scrub line — Altitude and speed, scrubbable across the day

List of recorded snowboarding sessions — Every session, kept on the device

Searching the session history — Search back through past sessions

Exporting a single session from the history list — Export a single session

Deleting a session from the history list — Delete a session you would rather forget

Bulk data export option in settings — Bulk export of everything recorded

Data export running with a progress indicator — Export in progress

Workout Tracker

STRONK: A Workout Tracker

iOS Live

A workout logger designed around the annoyances of actually being in a gym: a screen that won't lock between sets, your personal record visible while you log, and a rest timer that works correctly even when you are looking at another app when resting.

Keep Screen On: stop unlocking your phone between sets
Personal record shown while you log the set
Rest timer that pulses red every 30 seconds
Weight-and-rep or timed exercises: planks, holds, runs
Reuse a past workout as today's template
Create custom exercises, and fix typos by tapping any text

App Store

STRONK home screen with a Keep Screen On toggle and workout history — Keep Screen On: no unlocking between sets

A past workout reused as a template with every exercise ready to log — Reuse a routine you already like

Logging a bicep curl set with the personal record displayed below — Log a set with your PR in view

A timed plank being recorded with a running stopwatch — Timed exercises for planks, holds, and runs

Rest timer counting up under the current workout — Rest timer that flashes every 30 seconds

Creating a custom exercise called Plank from the search field — Create your own exercise on the spot

Editing the workout name inline to correct a typo — Tap any text to fix a typo

Slide to finish control at the bottom of a completed workout — Slide to finish the session

Swiping a workout in the history list to reveal a delete action — Slide to delete sets, exercises, or sessions

Walk Tracker

WALK: Very Serious Exercise

iOS Live

Session tracking for your walks. It counts your distance, steps, duration, pace. And a map of where you have explored.

Live distance, steps, duration, pace
Route map with a time scrubber
Trends across 7 days, 30 days, or all time
Full session history and data export

App Store

Walk dashboard ready to start, showing distance, steps, duration, pace and a map — Start a session: distance, steps, duration, pace, map

Completed one mile walk with 2,082 steps over 20 minutes and a route map — Replay finished walk on the map

Trends overview with total steps, distance, time and a steps-per-day chart — Trends over 7 days, 30 days, all time

Distance and duration charts broken out by day — Distance, duration and pace broken out by day

Altitude and speed charts for a one mile walk — Altitude and speed for the session

List of past walking sessions — Session history

Data export options in WALK settings — Take your data with you

Pomodoro Visual Timer

CLICK CLOCK: A Visual Timer

iOS Live

A replacement for a $20 desk gadget. The screen itself drains as the time runs down, so you can read how much is left from across the room without squinting at digits.

The whole screen empties as the time passes
Work and break modes with one-tap presets
Custom durations down to the minute
Dozens of alert sounds, or import your own audio
Ten alternate app icons

App Store

Timer ready at 30:00 with duration presets from 5 to 60 minutes — Timed presets, or something custom

Work session running with 29:57 remaining — A work session, just started

Timer at 21 seconds with two thirds of the screen filled to show elapsed time — The screen drains as the time runs out

Break mode set to five minutes — Break mode, five minutes

Duration picker set to 25 minutes — Set any duration you like

List of system alert sounds to choose from — Pick from the system alert sounds

Custom sound import supporting mp3, flac, midi, wav and more — Or use your own audio file

Alternate app icon picker with ten designs — Ten alternate app icons

WiFi Analyzer

Strongest WiFi Finder Analyzer

Android Live

Built to answer one question: where in this building is the signal strongest? It samples as you walk, remembers the best reading, and plots every nearby network by channel so you can see what the interferences are.

Live signal strength alongside the strongest reading recorded
Chart across 2.4, 5, and 6 GHz bands
Pick any SSID as the target
Map showing where the measurements were taken
In-app help for Android's scan-throttling limits

Google Play

Signal strength of -71 dBm with a best record of -53 dBm and a channel interference chart — Live strength, best record, and channel interference

SSID picker listing nearby networks with band and signal strength — Pick any nearby network as the target

In-app help explaining how to unlock Android WiFi scan throttling — Help for Android's scan-throttling limits

Web apps

No account signup needed. For golf equipment tracker, use promocode LuigiIsTheBest to get 100% discount forever (free forever, no need to enter credit card info).

⛳

Golf Equipment Tracker

WebLive

Tracks what PGA and LPGA professionals use (what's in their bag?), by club and shaft. Built in Svelte web framework, with Stripe for payments, Resend for magic-link sign-in (and email), and an agentic pipeline using omp and cron that discovers and ETLs the golf equipment data.

golf.cosmometrics.com Open

📄

Easy Temporary Storage

WebLive

Simplify printing documents at hotel computers, without having to worry about deleting files, clearing browser cache after printing, and having to worry about people around peeking at your login passwords.

Open source: https://github.com/gin/temp-pdf

temp-pdf.pages.dev Open

Privacy is the default.

Every Cosmometrics mobile app works on-device. No internet and no account needed. Nobody sells your data, because there is nothing to sell.

No data collectedRead it in the Privacy Policy. Nothing to leak, nothing to sell.

No accounts neededOpen an app and go. No sign-up, no login, no internet needed.

Yours, on-deviceYour activity stays on your phone, with option to export data out.

Behind Cosmometrics

One person, obsessed about metrics and visualizations.

I'm Luigi. I design, build, and ship every app on this page myself, from the first sketch through the store listing, the icons, and the screenshots you have been scrolling through.

My background is in platform engineering (SRE, Integrations, CI/CD), software engineering (web, data science), and qa (testing, automation, evals). I studied computational biology in school, and had worked with individuals and with companies of various stages from seed/A/B/late-stage startups to public companies.

If you want to talk about any of this, the apps, the approach, or building something together, my inbox is open.

hello@cosmometrics.com See the work again

Metrics for thingsyou care about

Selected work

Golf Tracker

Snowboard & Ski Tracker

Workout Tracker

Walk Tracker

Pomodoro Visual Timer

WiFi Analyzer

Web apps

Golf Equipment Tracker

Easy Temporary Storage

Privacy is the default.

Behind Cosmometrics

Metrics for things
you care about