A library organised by mood
Stories, hypnosis, soundscapes and ASMR as distinct categories with their own art direction, not one undifferentiated list.
We’re a mobile app development agency helping startups and businesses turn ideas into successful digital products.
Over a decade of building and launching mobile apps that make an impact.



Proven in AI-powered apps, healthcare, transportation, and more.
Get our full portfolio →One experienced team to design, develop, launch, and scale your mobile product. From initial concept to ongoing support.
We turn early ideas into clear product flows, clickable prototypes, and polished interfaces users actually understand. Before development starts, we shape the app around real user needs and business goals.
✦ AI here: market research and clickable prototypes in days, not weeks
We integrate AI where it creates real product value: voice, vision, smart search, recommendations, and AI-powered workflows.
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Fast, reliable apps built with each platform's native tools. Clean architecture, smooth performance, App Store readiness from day one — the choice when hardware and peak performance matter.
When speed and budget matter, we ship one codebase across iOS and Android with Flutter or React Native — keeping the experience close to native.
Dashboards, admin panels, and web apps that connect cleanly with your mobile product and backend.
The systems your app depends on: APIs, auth, databases, payments, push, and cloud setup. Stable, secure, built to scale.
From TestFlight to the stores — then onboarding, analytics, and post-launch iterations that keep the product improving.
✦ AI here: churn prediction & ASO keyword insights
We review your mobile app for security vulnerabilities, data protection risks, and potential weaknesses. From authentication and API security to secure data storage, we help identify risks and provide actionable recommendations to keep your app and users protected.
Real apps. Real users. Real ratings — pulled from the App Store today.
Calm stories, sleep hypnosis and soundscapes for falling asleep — narrated audiobooks, ASMR and a library organised by mood, not just a title list.
Slumber treats falling asleep as a listening experience, not a feature list. Stories, sleep hypnosis, soundscapes and ASMR sit in one library, each with full-bleed artwork that sets the mood before a single second plays.
Every player carries the same calm controls — 30-second skip, loop, favourite, offline download — so switching from a story to rain sounds never means relearning the interface.
Product strategy, UI/UX, native iOS, and the audio playback and offline system behind the library.
Stories, hypnosis, soundscapes and ASMR as distinct categories with their own art direction, not one undifferentiated list.
The same calm controls — skip 30, loop, favourite, download — work identically across every kind of audio.
Long-form audiobooks like Alice in Wonderland split into ordered tracks with per-chapter artwork.
Downloads keep the library usable with no connection — exactly when someone is trying to fall asleep.
A content model that scales to new narrators, categories and formats without a redesign.
Sleep apps default to a flat list of titles, which forces someone already tired to read and decide at the exact moment they most want to stop thinking. The content that helps — a story, a hypnosis session, rain on a window — gets buried under a search bar.
Every piece of audio in Slumber is a mood first: cover art, a narrator, a short description, all visible before playback starts. Categories split by what someone is actually looking for — History, Audiobooks, ASMR — and multi-part stories like Alice in Wonderland unfold as ordered tracks instead of one long file.
I stopped scrolling for something to fall asleep to. The mood is right there on the cover.
Alice in Wonderland as an actual audiobook with chapters is exactly what I wanted from a sleep app.
Offline downloads mean it works on a plane, which is when I need it most.
Same player for the rain sounds and the hypnosis sessions. I never think about the interface, only the sound.
Loop on the soundscapes is such a small thing and I use it every single night.
I stopped scrolling for something to fall asleep to. The mood is right there on the cover.
Alice in Wonderland as an actual audiobook with chapters is exactly what I wanted from a sleep app.
Offline downloads mean it works on a plane, which is when I need it most.
Same player for the rain sounds and the hypnosis sessions. I never think about the interface, only the sound.
Loop on the soundscapes is such a small thing and I use it every single night.
Loop on the soundscapes is such a small thing and I use it every single night.
Same player for the rain sounds and the hypnosis sessions. I never think about the interface, only the sound.
Offline downloads mean it works on a plane, which is when I need it most.
Alice in Wonderland as an actual audiobook with chapters is exactly what I wanted from a sleep app.
I stopped scrolling for something to fall asleep to. The mood is right there on the cover.
Loop on the soundscapes is such a small thing and I use it every single night.
Same player for the rain sounds and the hypnosis sessions. I never think about the interface, only the sound.
Offline downloads mean it works on a plane, which is when I need it most.
Alice in Wonderland as an actual audiobook with chapters is exactly what I wanted from a sleep app.
I stopped scrolling for something to fall asleep to. The mood is right there on the cover.
Home · Interior designCasa AISnap a room and redesign it with AI: interiors, exteriors and gardens reimagined in seconds, with real furniture swaps and style presets.
Productivity · LearningHappy ShyA confidence-building companion: daily prompts, progress streaks and gentle social challenges.The same loop powers every launch. Predictable cadence, transparent demos, and a single point of contact who actually picks up the phone.
A week of AI-assisted discovery. Goals, risks, milestones — you walk away with a clear roadmap and a fixed first-sprint scope.
Pick your niche — we'll send a curated PDF of case studies with real metrics.

From smart assistants to automation tools — we build AI apps that drive results.
One email — no newsletter, no spam.
Straightforward answers to the questions we hear most often from our clients.Have more questions? → Book a Discovery Call
We do both, so you get an honest answer instead of a sales pitch. Flutter wins when speed and budget matter — one codebase, two platforms. Native (Swift, Kotlin) wins when you need deep hardware integration, complex animations, or peak performance. On a discovery call we'll recommend one — and explain why.
A typical MVP goes from prototype to the App Store and Google Play in about 12 weeks: one week of discovery, then design and 2-week build sprints with TestFlight builds every Friday. Complex products take longer — you'll get an honest timeline after scoping, not a number we can't keep.
It depends on scope, but you won't get vague answers: after a discovery week you get a clear roadmap with a fixed first-sprint scope and budget. Cross-platform usually reduces cost by 30–40% versus building two native apps. We work in transparent 2-week sprints, so you always see what you're paying for.
No. AI accelerates every stage — research, prototyping, boilerplate, tests — but senior engineers own every result. Every line of code is reviewed by humans, covered by tests, and held to the same standard whether AI helped write it or not. That's how we ship faster without shipping worse.
You do — 100%, from day one. Full IP transfer is in the contract, the code lives in your repositories if you prefer, and we sign an NDA before the first call if needed.
You contract with Appventis OÜ, a company registered in Estonia — so you get an EU legal entity, EU jurisdiction, and GDPR compliance by default. Invoicing and payments work like with any European vendor.
You get a single point of contact who actually picks up the phone, plus direct access to the team in Slack. Weekly demos, sprint reviews, and full overlap with EU hours — 3–4 hours daily with the US East Coast.
We stay on. Store submission, ASO, analytics, and post-launch iterations — most of our clients continue with v1.1, v1.2, and beyond. You can keep the full team, scale down to support mode, or hand everything over to your in-house developers with full documentation.
Reviews we didn’t pay for, and the products they’re talking about.
We combine technical expertise, clear communication, and a hands-on approach to help you build, launch, and grow your mobile product.
Work directly with the people responsible for your project. Regular updates, transparent workflows, and full visibility into development progress.
We don’t just follow specifications. We help you make informed technical decisions that align with your product goals, timeline, and budget.
From architecture and code reviews to testing and release preparation, we focus on building stable, maintainable mobile apps that are ready to grow.
Our work doesn’t end at launch. We stay involved to maintain, improve, and scale your product as your business evolves.
Stories, lessons, and practical insights from building mobile apps and working with startups and businesses.
Small senior team, real products in the stores, no bureaucracy. If that sounds like you — write us.
Ship cross-platform products where one codebase genuinely wins.
Make our clients’ apps discoverable — listings, keywords, creatives and analytics.
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