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.

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.

It is built with Swift for iOS and Kotlin for Android.

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.

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.

Indilingo is an AI-powered language learning app built for India’s multilingual reality, helping you master 20+ Indian languages like Hindi, Sanskrit, Tamil, Telugu, Kannada and more directly from your own mother tongue, without relying on English. With adaptive lessons, live AI speaking and chat practice, real-time pronunciation feedback, and culturally rich, real-world scenarios, Indilingo makes language learning intuitive, immersive, and truly personal to every Indian learner.

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

no code web to app converter which converts websites to native android apps if you are small business owner or just a curious who doesn't wanna open browser everytime! This is the best choice

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

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.

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

product photo application

LinkedIn post generator that doesn't sound like AI

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.

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

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

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.

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.

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.

A Visual AI RPG adventure with AI NPC's and World

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

Dosefi — a focused subscription app for tracking medication doses and reminders. 100% subscription-based revenue with both monthly and annual plans already live and converting. Clean, single-purpose product in the health and welness niche with a loyal early user base and clear room to grow through ASO, pricing, and paywall optimization. Fully built, live on the App Store and Google Play, and ready to transfer.

Manage hosting, domains, deployments, DNS, analytics, and uptime from your iPhone or iPad. Verceltics brings 27 integrations into one native workspace, including Vercel, Cloudflare, Netlify, Google Analytics, and Search Console. Credentials stay on your device, and requests go directly to each provider. Open-source, with monthly, yearly, or lifetime Pro access.

Capture your daily moments in just 5 seconds. Watch your life story unfold through beautiful automatic montages.

Suby shows people what they really pay for subscriptions. Add Netflix, Spotify or any service in two taps from a built-in catalogue, or import them from a screenshot. Get reminded before renewals and free trials charge, see total spend in any currency, and spot what to cancel.