Built on evenings & weekends

I build the apps that I'd like to use.

9 free apps for iOS, Android and the web. Everything runs on your device — no account, unless you want to sync. No subscriptions necessary; pay once, keep forever.

The apps
What I've made so far

The apps

All free to use, no forced sign-ups, and they work offline when possible.

Free
BatchPad app icon

BatchPad

Photo Editor for Instagram

Batch Processing Watermarks

Tired of Instagram cropping your photos? Never suffer a bad crop again. Platform-perfect dimensions like 4:5 guarantee your entire image is seen. Process 100+ images in a single batch, add custom watermarks, and always export in full, original quality with smart color matching.

Download on the App Store Get it on Google Play
More about BatchPad
Free
Lumet app icon

Lumet

Pro Softbox & Lightbox

Photography Studio Light

Turn your device into a professional studio light. Perfect for product photography, portraits and video calls. Lumet gives you a clean, high-quality softbox and lightbox with adjustable color temperatures and brightness to get the shot right every time.

Download on the App Store Get it on Google Play
More about Lumet
Free
Name Scout app icon

Name Scout

Baby Name Finder

Baby Names Data & Trends

Overwhelmed by endless baby name lists? Find the right name with data-driven insights: explore historical trends and meanings, sync favorites with your partner, and get answers backed by real U.S. data since 1910, including popularity rankings.

Free
Eranorms app icon

Eranorms

Historical Weather

Climate History Charts

Is today hotter than usual? Eranorms puts your local weather into historical context. Visualize climate trends with stripes, heatmaps and box plots, and compare this year against decades of data going back to 1950 to understand the story behind your weather.

Free
Pointsuno app icon

Pointsuno

Points & Miles Calculator

Credit Cards Travel Rewards

Stop guessing what your points are worth. Pointsuno helps you maximize redemptions by comparing transfer partners side by side. Calculate real value including taxes, fees and transfer bonuses, so you always know the best deal on your next flight or hotel.

Free
PhotoSpots app icon

PhotoSpots

Scout, Pin, Return

Location Scouting Golden Hour

Found the perfect location but had the wrong light — or the wrong lens? Pin any spot, log GPS, gear notes and access details, then use the 3D shadow simulator and golden-hour timings to plan exactly when to come back.

Download on the App Store Get it on Google Play
More about PhotoSpots
Free
Timeli app icon

Timeli

Visual Habit Tracker

Habits Logs

Track progress visually with Timeli. See your habits laid out as a timeline, spot the patterns, and build long-term consistency. Simple, elegant, and designed to stay out of your way while keeping you accountable.

Download on the App Store Get it on Google Play
More about Timeli
Free
In Season app icon

In Season

Fruit Encyclopedia

Nutrition Seasonality Web & Mobile

Explore the world of fruit with In Season. Nutritional facts, seasonality guides and professional selection tips — like checking a melon for sugar freckles — in an interactive encyclopedia built for foodies and the merely hungry.

Free
Tempo app icon

Tempo

Temporal Dial

Timezones Web App

Coordinate work across continents with a synchronized timezone dial. Scroll any city to move every column in lockstep, snap to exact hours, visualize working-hour overlap, and mark planning blocks for workshops and handoffs.

FAQ

Questions & stuff

How these are built, why they're free, and how I keep the lights on.

Got another question?

Shoot me an email and I'll get right back to you.

hi@yellowsquared.us
Are your apps free to download?
Yes. Every app on this page is free to download and free to use — there is no trial that expires and no subscription to cancel.
If the apps are free, how do you make money?
Two ways, and neither one gates the app. Some apps show ads. Some offer an optional paid upgrade for extra features. Everything the app is actually for stays usable for free, and nothing here is funded by selling your data.
Do I need an account or sign-in?
No. None of my apps require you to sign up, sign in, or create an account. Where an app stores something — your saved photo spots, habit logs, or baby name choices — it stores it locally on your device.
How is my privacy protected?
I do not sell your personal data, track your location in the background, or store your personal content on remote servers. Everything you save or log stays on your device. The full details are in the privacy policy.
Do YellowSquared apps work offline?
Yes! Mobile apps like BatchPad, Lumet, PhotoSpots, Timeli, Name Scout, and In Season work completely offline without an active internet connection. Apps that rely on live data (such as climate trends in Eranorms or transfer ratios in Pointsuno) update when online and cache data for offline viewing.
Which platforms are the apps available on?
Most apps are available on both iOS (Apple App Store) and Android (Google Play). Tempo runs directly in any modern desktop or mobile browser with nothing to install. Name Scout, Eranorms, Pointsuno and In Season also have a browser version, so you can try them without installing anything.
How does BatchPad prevent Instagram photo cropping?
BatchPad automatically resizes and frames your images into platform-standard aspect ratios (such as 4:5 for portrait or 1:1 for square) with smart color matching so Instagram never crops out your subject. You can process 100+ images in a single batch, add custom watermarks, and export in full high-resolution quality.
How does Eranorms help me understand weather and climate trends?
Eranorms puts current weather into historical perspective using over 70 years of climate data (going back to 1950). Visualize trends with climate stripes, heatmaps, and box plots to see how today's temperatures compare against long-term averages for your area.
Can I use Lumet as a softbox light for photography and video?
Yes! Lumet turns your smartphone or tablet screen into a professional studio light source. You can adjust color temperature (from warm tungsten to cool daylight), fine-tune brightness, and display lighting grids for product photography, portrait fill light, or video call illumination.
Where does Name Scout get its baby name data?
Name Scout uses official U.S. Social Security Administration (SSA) birth data spanning from 1910 to the present. You can analyze long-term popularity trends, filter names by meaning or origin, and sync favorites with your partner.
How does Pointsuno calculate point transfer values and redemption deals?
Pointsuno compares credit card rewards programs (Chase, Amex, Capital One, Citi) against airline and hotel transfer partners side-by-side. It factors in active transfer bonus promotions, taxes, and fees so you always know the best redemption value for your next flight or hotel stay.
How does PhotoSpots' golden hour calculator and 3D shadow simulator work?
PhotoSpots lets photographers pin location spots with exact GPS coordinates, camera gear notes, and access details. Its 3D shadow simulator and solar calculator predict exact sun angles, golden hour, and blue hour lighting for any date and time.
How is Timeli different from traditional habit trackers?
Timeli visualizes your habits along an interactive, continuous timeline instead of rigid daily streaks. It helps you recognize natural routine patterns, track long-term consistency, and build habits without pushy notifications or guilt.
What information is included in the In Season fruit encyclopedia?
In Season offers comprehensive nutritional breakdowns, seasonality charts, sugar content ratings, and practical selection tips — such as checking watermelons for yellow field spots or melons for sugar freckles.
How does Tempo handle cross-timezone planning?
Tempo features a synchronized timezone dial for web browsers. Scrolling any city moves every other city's timeline in lockstep, making it instant to spot overlapping working hours, snap to exact meeting slots, and coordinate international handoffs.
Can I export or back up my data?
Apps that track your personal data (like Timeli for habit logs) support local CSV data exports so you always own your information. Reference and utility apps (like In Season, Lumet, or Eranorms) don't require accounts or collect personal logs, so there's no data locked away.
Something is broken or I have a feature request. Who do I tell?
Email hi@yellowsquared.us. YellowSquared is one developer, so your email goes straight to the person who wrote the app — and I read and reply to every message myself.