Oleg Tuaev

Oleg Tuaev · independent product developer

Digital products that leave room for people.

I build Margent, a private library of thoughts, and Lunar, a personal check-in journal. I shape the user flows, write the copy, and turn them into working apps.

Margent
iOS · App Store
Android · beta
Lunar
iOS · TestFlight
iOS · Android · webProduct design and development2026
02 / 03

Products

Different stories.
The same level of care.

One helps you keep a thought. The other helps you notice changes in yourself. Two apps, each with its own purpose and character.

Margent
On the App Store

Thoughts worth returning to.

Photograph a quote or write down a thought. Margent keeps the text, source, and note together, then brings the entry back in the app or widget.

iOS · App Store Android · beta Free · Works offline
Margent onboarding: save a quote or your own thought
It starts with one thought.
Key decision
Go beyond saving: the Today screen and widgets bring thoughts from your library back into view.
What is built
Quotes from photos or manual entry, an offline library, and customizable widgets. Circles let you share selected thoughts and discuss them.
My work
Concept, copy, interface design, and iOS and Android development. Published on the App Store; continued product development.
Lunar
Public beta

Small check-ins. A clearer picture of your days.

Note how you feel in the morning and what changed in the evening. Lunar brings your entries together in a visual history — without scores or mandatory streaks.

iOS · TestFlight Works offline Sync
Discover Lunar
Lunar Orbit screen with a history of daily check-ins, shown in Russian
Orbit — a history of check-ins · iPhone · Russian interface
Key decision
Day Budget helps you decide what to make room for: tasks, people, your body, or rest. A direction for your attention, not a list of obligations.
What is built
Morning and evening check-ins, Orbit history, observations, and saved summaries. Offline access and sync.
My work
Self-reflection flows, non-judgmental copy, interface design, and iOS development. Releasing and improving test builds.
03 / 03

About

I build what matters to me.

I make apps for needs I encounter myself and discuss with people close to me.
My wife, Anna, is my greatest source of inspiration.

I build Margent and Lunar myself, from the first user flows to the copy, interface, and code. I want the finished app to stay true to the simple human need that started it all.

Get in touch

Approach

From a user flow to a working solution.

Start with the action

What someone wants to do, what gets in the way, and what a useful outcome looks like.

Write and design together

Names, guidance, and screen behavior should all explain the same interaction.

Test the real product

Test builds and feedback reveal things that a mockup cannot.