Leo Rezaei

Founder of Lionary LLC, the iOS studio behind Picker AI, ProSim and Workout AI

Los Angeles, United States Mobile App Makers AI Builders

Leo Rezaei at a glance

Known for: Picker AI, ProSim and Workout AI
Based in: Los Angeles, United States
Indie since: 2023
Active products: Picker AI, ProSim and Workout AI

Facts checked 2026-11-04

About Leo Rezaei

Leo Rezaei is an indie app maker and the founder of Lionary LLC, a small iOS studio. Lionary publishes a portfolio of consumer apps on the App Store, the best known of which is Picker AI, an AI photo picker that ranks a batch of photos and tells you which one to post for a given purpose, such as a dating profile, Instagram or LinkedIn.

Picker AI launched on the App Store in June 2023 and on Product Hunt the following month. It lets you add up to 200 photos at once, scores each one out of 100 and explains its top pick; a later Max mode lets you ask for a pick in your own words. The app has a free basic tier and paid Max plans, and has collected a few hundred ratings with an average above four stars.

Alongside Picker AI, Lionary has shipped ProSim (2024), a Mac utility for working with the Xcode Simulator, and a run of single-purpose iPhone apps in 2026: Workout AI, an AI fitness coach; Pupti, a puppy potty-training log; PottyStar, a potty-training app for kids; Chalk, a construction calculator; and Confetto, a party and wedding photo booth. Earlier projects listed on his profile, the AI dating assistant Rizz Score and the actor toolkit Roleway, are no longer available.

Lionary is based in Los Angeles, and its product sites linked to the X account @theLionary, which no longer resolves.

Products by Leo Rezaei

Picker AI

pickeraiapp.com

iPhone app that scores up to 200 photos and picks the best one to post for dating apps, Instagram, LinkedIn or headshots, with an explanation.

ProSim

prosimapp.com

Mac utility that helps iOS developers work faster with the Xcode Simulator.

Workout AI

getworkoutai.com

AI fitness coach for iPhone that builds custom workout programs and adapts them to your goals.

Pupti

puptyapp.com

iPhone app for logging a puppy's potty breaks during house training.

PottyStar

pottystarapp.com

iPhone app that helps parents potty-train toddlers with tracking and rewards.

Chalk

chalkcalc.com

Construction calculator for iPhone that works in feet-inch-fractions and metric.

Confetto

confettoapp.com

Photo booth app for iPhone and iPad aimed at weddings and parties.

Rizz Score

rizzscoreapp.com

shutdown

AI dating assistant for iPhone that helped improve dating-app messages; no longer on the App Store.

Roleway

roleway.com

shutdown

Web toolkit for actors with feedback on headshots and auditions and agent matching; the site is no longer available.

Timeline

2023 — Launched Picker AI on the App Store in June and on Product Hunt in July.
2024 — Released the Rizz Score dating assistant and ProSim, a Mac tool for the Xcode Simulator.
2026 — Shipped a run of new iPhone apps under Lionary: Pupti, Workout AI, Chalk, PottyStar and Confetto.

How Leo builds

Ship many small, single-purpose apps and keep the ones that find users.
Use AI to take a tedious decision, like picking the best photo, off the user's hands.

Leo Rezaei FAQ

Who is Leo Rezaei?

Leo Rezaei is an indie iOS developer in Los Angeles and the founder of Lionary LLC, the studio behind Picker AI, ProSim, Workout AI and several other iPhone apps.

Who made Picker AI?

Picker AI is published by Lionary LLC, Leo Rezaei's app studio. It launched in 2023 and ranks your photos to pick the best one for dating apps, Instagram or LinkedIn.

What is Lionary LLC?

Lionary LLC is a small Los Angeles app studio that publishes consumer iPhone apps including Picker AI, ProSim, Workout AI, Pupti, PottyStar, Chalk and Confetto.