499apps

Entrepreneurial App Studio

Real-world apps, shipped from real-world pain points.

499apps is a builder's lab for practical software: fast prototypes, useful automation, and utility apps that solve daily workflow friction.

Start Building What We Build

Private repos44

Updated in 180 days37

Primary stackPython · TS · JS · Kotlin

01Products

Convo Keeper

Free Chrome extension that saves any ChatGPT, Claude, Gemini or Grok chat as Markdown, PDF, HTML, JSON or text, entirely on your device.

Open Convo Keeper

Petit Mot

Free Chrome extension for families learning French while they browse: gentle word swaps, Word Hunt games, family streaks and a built-in offline voice.

Open Petit Mot

Interrogation

A private mystery game for friends and families: four seats, one case, real deduction. In development, no launch date yet. Watch the how-to-play series and two real-case episodes: the 1911 Mona Lisa theft and the 1917 Cottingley Fairies.

Open Interrogation

02What this site is about

The portfolio signals one clear theme: build many focused apps that each do one job well. The center of gravity is productivity tooling, workflow automation, and utility software for everyday operations.

You will also see selective mobile and assistant-style experiments where speed of iteration matters more than polish on day one.

03Current focus areas

  • (a)

    Automation-first tools

    Small systems that reduce repetitive work across communication, scheduling, and operations.

  • (b)

    Utility micro-apps

    Single-purpose products for specific user pain points, shipped quickly and improved continuously.

  • (c)

    Mobile side bets

    Android and wearable ideas tested as lightweight experiments before wider rollout.

  • (d)

    AI-assisted workflows

    Targeted assistant behavior where LLMs can reduce decision time or execution overhead.

Field notes

  • Portfolio trend: workflow automation and practical productivity tools.
  • Build style: narrow scope, fast release, iteration from real usage.
  • Tech footprint: Python + TypeScript + JavaScript + Kotlin projects.
  • Experiment model: many small apps instead of one oversized platform.

04Operating method

  1. Pick real friction.

    Build around a painful recurring task, not a trend.

  2. Ship narrow.

    Release a useful first version fast and validate behavior.

  3. Iterate with evidence.

    Keep what works, cut what does not.

05Why 499apps exists

This is a long-game journey: many practical apps, each grounded in use, each getting sharper over time.

Build useful things. Learn from real users. Repeat.

06Contact

Questions, ideas or feedback? Say hello.

hello@499apps.com