Mobile · Family Budget·2026

Birikko

Birikko is a family budgeting app where a household manages income and expenses together in one shared ledger. Role-based membership, AI-powered spending insights, category budgets, subscription tracking, multi-currency support and savings goals in a single app — no bank connections, no ads.

FlutterDart.NETPostgreSQLDocker SwarmFirebaseRevenueCat

Duration3 months

PlatformiOS · Android

Team1 person

Year2026

What was the challenge?

In most families the budget is scattered across personal notes, spreadsheets and banking apps. With no shared view, who spent what, which subscription renews next and what's left at the end of the month only becomes clear when it's too late.

How we solved it

A shared household ledger with role-based access (Owner, Admin, Member, Viewer) and email invites
AI-powered insights that catch unused subscriptions and unusual spending spikes
Category budgets with warning thresholds, subscription tracking with a renewal calendar, and savings goals
Multi-currency support with the exchange rate locked per transaction
One subscription per household: Premium covers every member (₺899/year), and the free tier works indefinitely

Technology

Technology stack

Mobile

iOS & Android app

FlutterDart

Backend

API and business rules

.NETC#

Data & Infrastructure

Self-hosted database and orchestration

PostgreSQLDockerDocker Swarm

Services

App services and subscription management

FirebaseRevenueCat

Technical Approach

Birikko was built end to end by a single full-stack developer in three months, from design to store release. The mobile app is written in Flutter and ships to iOS and Android from one codebase. The household ledger, roles, budgets and subscriptions are served by a .NET backend API. Data lives in PostgreSQL, and the database and services run self-hosted on Docker Swarm, keeping infrastructure costs and data ownership fully in-house. Firebase powers the app-side services, while RevenueCat manages App Store and Google Play subscriptions in one place. Premium is scoped to the household, so a single purchase unlocks it for the whole family.

Screens

Screenshots

Facts

What we delivered

Duration

3 months

Platform

iOS · Android

Technology

FlutterDart.NETPostgreSQLDocker SwarmFirebaseRevenueCat

Scope

Product DesignMobile DevelopmentBackend DevelopmentSelf-hosted InfrastructureSubscriptions & PaymentsApp Release

Links

Website App Store Google Play

Outcomes

Deliverables & outcomes

Achievements

Live on the App Store and Google Play
Available in Turkish and English, with multi-currency support
No bank connection required, ad-free, data encrypted in transit and at rest
Freemium model: free tier + ₺899/year household Premium

Deliverables

iOS & Android app
.NET backend API
Self-hosted PostgreSQL infrastructure on Docker Swarm
Subscription and Premium integration with RevenueCat
Marketing website and store assets

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