Luminarlab.
An independent software studio. We make apps people use every day.
What we’ve made
Four apps. Tens of millions of installs.
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01
Flagship
Fonts: Change Typefaces
A keyboard that lets you change typefaces inside Instagram, WhatsApp, Snapchat, and anywhere else you type. The flagship — rebuilt three times, still the one we obsess over. It earned its place at the top of this list.
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02
Live
Font Keyboard: Fonts & Emoji
A keyboard with 100+ fonts, emojis, stickers, and themes.
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03
Live
Snap Friends
Find new Snapchat friends from around the world.
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04
Live
Youmax: AI Looksmax
AI-powered self-image feedback.
In aggregate: 5 apps · 25M+ downloads · 600K+ reviews · 4.4★ average.
How we work
A small team, a sharp toolkit.
One codebase in Kotlin Multiplatform ships to iOS and Android. AI does the heavy lifting on the keyboard, so two people can move like ten.
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01
Kotlin Multiplatform
Shared business logic across iOS and Android. Native UI on each platform. We rewrote the stack on KMP three years ago and have shipped on it ever since.
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02
AI–native development
Heavy use of AI tooling across the entire build — coding, refactors, code review, QA, copy. It’s how a tiny team keeps four apps healthy at once.
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03
Market research
We pick categories carefully. Before we build, we’ve usually spent weeks on the long tail of competitors, reviews, and search demand.
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04
App Store Optimization
Listings that earn their installs. We treat icons, screenshots, keywords, and conversion as a craft — not an afterthought.
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05
App strategy
What to build, what to cut, what to charge for. Most of our wins came from saying no to the obvious next thing.
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06
TikTok marketing
We know how the algorithm rewards consumer apps in 2026. We ship creative quickly and read the results without flinching.
About
A small studio, on purpose.
We’re a tiny team that has shipped consumer software to tens of millions of people. We pick a few problems, sit with them for years, and try to make the resulting apps quietly excellent. The work is the marketing.
We don’t do client work, we don’t fundraise, and we’re not building a platform. We’re happy where we are: independent, profitable, and slow on purpose.