Isaac's Product Lab

About

Isaac Lee

Hi, I'm Isaac Lee.

I'm the inventor, founder, designer, and engineer behind Flexcil (Time's Best Invention of 2021, Apple App Store App of the Year 2020) and founder of Strum Technology Corp. I build productivity tools where education, collaboration, and AI meet — with an emphasis on calm interfaces, privacy-first architecture, and tight iteration loops with real users.

Building now

Current products in active development — from Strum's local-first AI stack to solo Mac tools.

Reelbook
ReelbookBuilding

Local AI agents. Your data stays yours.

Local-first AI for creators — no central server, no cloud uploads. Run FFmpeg, Whisper, Demucs, and yt-dlp locally with skills and agents from SkillMP.

Highlights

  • All data lives in a folder you choose
  • One-click install for local media models
  • Built for video creators, podcasters, and instructors
Focus Lens
Focus LensBeta testing

AI-powered time tracker for solo builders

Uses LLM context — not app-name rules — to evaluate whether what you're doing right now is relevant to your stated goal. Local Mac app with your own API key.

Highlights

  • Screenshot + OCR + goal-aware LLM evaluation
  • Roughly $0.05–0.10/day running cost
  • Free for personal use — not employee monitoring
MacPurity
MacPurityBeta testing

The Mac cleaner I built at midnight

Surfaces hidden disk junk as real, inspectable categories — old dotfiles, abandoned node_modules, dormant app data — so you review before deleting anything.

Highlights

  • No subscription or cloud upload
  • Inspectable categories, not vague cache totals
  • Shipped v0.1.0 overnight from a personal pain point

GrowthBase

Building

Local-first marketing OS for indie builders

A local-first marketing workspace for products like Focus Lens and Sayso — plan posts, track platforms, and monitor comment opportunities from a Next.js dashboard and Chrome extension.

Highlights

  • All app data stored locally under ~/.growth-base/
  • Chrome extension polls for comment candidates every 30 minutes
  • Products, platforms, plans, and posts in one dashboard
SaySo
SaySoBeta testing

Translation that understands relationships, not just words

Before you translate, pick who you're talking to — café owner, landlord, someone you're seeing. Context-aware AI for Thai, Vietnamese, and Indonesian that gets register, pronouns, and social tone right.

Highlights

  • Relationship presets reshuffle by country and context
  • Voice-first with bidirectional hand-the-phone-over mode
  • Public beta on TestFlight — born from a year of digital nomad life in SEA
RelayBaseBuilding

Your own email relay infrastructure, without the markup.

Multi-tenant email relay being rebuilt on Cloudflare — HTTP API for sending, domain verification, and inbound mail so product code never talks to AWS SES directly.

Highlights

  • Cloudflare Workers — one tenant per product
  • Send, verify domains, and read inbound mail over HTTP
  • Detached from the ops dashboard as standalone relay infrastructure

Product history

Products at Strum Technology Corp, Flexcil, and the journey that shaped how I think about UX and iteration.

Loopl.ai
Loopl.aiActive

May 2025 — Present

Database management reimagined for AI-native developers

Makes databases accessible through AI-powered visualization, natural language interaction, and intelligent data management — built for developers using AI coding tools who need database power without SQL complexity.

Highlights

  • Chat with Supabase in plain English
  • AI schema discovery and smart CRUD builder
  • Connects to PostgreSQL, MySQL, Notion, Airtable, and more
WeDesk.so
WeDesk.soActive

Mar 2023 — Present

Every business requires customized workspaces

An AI-powered, no-code workspace builder that adapts to unique business workflows instead of forcing teams into one-size-fits-all structures.

Highlights

  • Smart project intelligence and resource allocation
  • Dynamic interface customization
  • All-in-one stack replacing generic tool sprawl
Strum
StrumPast

Aug 2020 — May 2023

Audio whiteboarding for remote teams

A lightweight audio meeting tool for remote teams who regularly exchange screens, files, and ideas — designed to make digital communication as vivid as in-person exchanges. Launched on Product Hunt.

Highlights

  • Voice-to-visual translation via semantic analysis
  • Spatial audio intelligence for team sync
  • Built in Seoul for distributed collaboration

AirNote

Past

May 2019 — Jul 2020

Real-time collaborative learning for iPad

A real-time collaborative learning platform for iPads — PDF note-taking, live annotations, and video conferencing designed to enrich remote learning between teachers and students.

Highlights

  • Teacher-student interaction on iPad
  • PDF note-taking with real-time annotations
  • Video conferencing integrated into the learning flow
Flexcil
FlexcilPast

Jun 2015 — Dec 2018

Note-taking and reading, reimagined for digital documents

Inventor, founder, designer, and engineer behind Flexcil — a human-centric document solution for students, researchers, professors, and engineers. Over 5 million users. Featured in Apple stores worldwide after Tim Cook launched the education iPad in March 2018.

Highlights