Startups using Kotlin

A profitable subscription app solving a personal, emotionally-driven problem. No seasonality, universal demand across cultures, strong upfront willingness-to-pay. Already localized into multiple languages and live on iOS and Google Play, though those localized markets haven't been targeted yet. It ranks strongly in both traditional and AI/LLM search for several of the category's highest-intent keywords, all trending up.

A speech-to-text application that runs on Mac, Windows, and as a browser extension. The app allows users to record their voice and instantly generate a transcript that they can insert on any app and website on their computer.

AI Video Generator App, iOS(%85), Android(%15) and Web. Focusing on a specific niche. Monthly Costs: %15 Apple fee ~$3000 API Costs(AI) ~$170 RevenueCat ~$30 Vercel ~$3 Cloudflare R2 Web Project is so tiny: ~$100 MRR

ControlResell is a monthly subscription software that allows resellers to track all their sales and purchases. We have a YouTube channel with tens of thousands of views, a podcast, and a recognized brand image in the industry (France only). The potential is enormous, especially in the US.

Photography app.

ThreadCam allows user to create 3D mockups of their tshirt/garment designs. Mainly iOS app, just launched android app.

A profitable organically grown subscription-based iPhone Japanese learning app with no costs except Apple Proceeds and a differentiated Lock Screen learning experience. The product is mature, polished, and designed for recurring daily engagement, with clear expansion potential across content, localization, and lifecycle marketing.

textbee turns your Android phone into an SMS gateway, allowing you to send SMS messages programmatically from your applications.

Insidr is the direct-to-fan subscription platform where your superfans pay you monthly for unreleased music, demos, behind-the-scenes access and more.

AI dictation for professionals who write all day. Speak naturally and get finished, punctuated text wherever the cursor is, in any app or website, with no voice training. Runs on Mac, Windows, Chrome and Android. A medical mode handles drug names and clinical terms with per-user vocabulary packs, and doctors are the core paying segment. Also used by lawyers, consultants and writers, many of them former Dragon users.

Italy mandates CAdES digital signatures (.p7m) for public-sector invoices, contracts and court filings — and nothing on Windows, macOS, iOS or Android opens them natively. P7M.io reads them in the browser, with no upload: the file never leaves the device. Three channels on one codebase: a web app, an iOS app and an Android app. Ranked #3 on Google for the core queries, 40,000 organic clicks a month, zero paid acquisition, zero staff.

$112k total revenue to date and $20.6k in the last 12 months (listing shows only recent RevenueCat data; store reports on request). Rated 4.8 stars and 99.9% crash-free, the app is a daily habit for players tracking tasks, collections and recipes. One Kotlin Multiplatform codebase powers iOS and Android, with game data updated remotely. Cloud sync subscriptions just launched alongside ads, leaving lots of room to grow.

MausBot is the open-source alternative to Grok Bot, Muse by Meta, Cue by Manus and OpenAI Dots: a team of AI bots that do real work on a computer for you. Ask in chat and a bot opens a browser, researches a topic, fills in forms, writes posts and replies, or works through files on its own. Routines run on a schedule, like a morning brief or a daily report. Bots connect to your apps, pass tasks to each other, and ask before anything risky. Take over from your phone at any time.

Indilingo is an AI-powered language learning platform that lets you learn any language from any language. Supporting 39+ languages, including English, Spanish, French, German, Japanese, Korean, Hindi, Tamil and Kannada, it combines AI conversations, live speech practice, structured lessons, interactive exercises and personalized feedback to help learners develop real-world fluency. It has over 100K users in 170+ countries!

Generate estimates in minutes with a user-friendly interface, reducing friction and boosting confidence with AI-enhanced accuracy.

BEEZZ is a shared home budget for couples and families. Up to 4 people track money in one budget, each from their own phone. Add an expense by voice ("groceries 45 at Walmart"), with a quick keypad, or straight from bank notifications on Android (188 banking apps) and Apple Pay on iPhone. A free forecast shows what's left this month; savings pots with goals, recurring bills, a weekly report and a monthly wrap do the rest. Available in English, Polish, Dutch and Swedish.

Take one clear photo to get a likely identification, issue details, and an estimated value range. Save the result, ask follow-up questions, and keep your collection searchable.

BlockIt blocks your addictive apps (Instagram, TikTok...) until you do real pushups, squats or planks — verified on-device with 3D pose detection, not a timer you can skip. Native iOS (SwiftUI) + Android (Kotlin) + NestJS/Postgres backend, both live in the stores. StoreKit 2 & Play Billing, paywall + free trial, gamification (levels, badges, leaderboards, clans), 5-language localization, MediaPipe pose tracking. Growth is 100% organic via short-form content.

Turn your selfies or portraits into cool vintage photos in seconds with Vintage AI.

The Kotlin/Compose Multiplatform boilerplate to launch Android and iOS apps faster, from a single codebase.

Vintage film camera with 35mm looks, grain, custom recipes and photo editing.

product photo application

Comics & Manga Maker. Grew organically on App Store, Google Play and Web. Google Play 10k+ download. There's clear room to grow: ASA, Meta, paid UGC on TikTok, paywall price tests, and new styles/templates.All channels from day 1, fast transfer. Scale it.

LinkedIn post generator that doesn't sound like AI

A polished, ready-to-monetize iOS app that uses AI-powered image recognition to instantly identify wood types and plants from a single photo. Perfect for woodworkers, hobbyists, botanists, and DIY enthusiasts. Already live on the App Store with a clean UI and built-in monetization potential. A turnkey product in the growing AI utility app space — just acquire and scale.Looking to sell to raise capital, price is negotiable

WidGeek Widget is the fastest and most fun way to stay close to your best friends by beaming your mood directly to their Home Screen.

Daily Philosophy. Ancient wisdom for modern struggles. A racing mind, a hard decision, a heavy week. People have carried these same problems for thousands of years, and the wisest among them left instructions. Roots turns their answers into a few calm minutes a day.

Write French you're not afraid to send. End the doubt in every sentence. Audio dictations with instant AI correction. Built for adults who want to write French without hesitation. CEFR A1 to C2. iPhone, iPad and Android.

Transform the way you work on iPhone with BossAI, the intelligent keyboard that turns your voice into polished text.