What we do, end-to-end

From product idea
to App Store launch.

We design, build, and ship privacy-first mobile apps — and we help other teams do the same. Two service tracks, one quality bar.

Dufengxun development process

Apps we ship under our own label

Every product in our portfolio is conceived, designed, and built by our in-house team — published globally on the App Store and Google Play, monetized through IAA ads and IAP, and engineered to handle the strictest privacy regulations out of the box.

01 Personal Parameter Tracking

Apps that help users log, track, and visualize personal parameters — from daily habits and routines to long-term health, fitness, and wellness metrics. Local-first, beautifully visualized, and effortless to maintain.

02 Decision Support Tools

Structured frameworks — weighted scoring, pros/cons matrices, decision trees, multi-criteria analysis — that turn complex everyday and professional choices into clear, defensible outcomes. No cloud, no telemetry, just better decisions.

03 Time Visualization

Novel ways to see how time actually moves through a day, week, or year. Radial clocks, flow diagrams, color-coded heat maps, retrospective views — all rendered with platform-native performance and zero cloud round-trips.

04 Life Specification Managers

Tools for defining and tracking the specifications of one's life — routines, budgets, reading lists, project plans, household specifications. Composable, modular, customizable to each user's actual workflow.

05 Mood & Emotion Journals

Private, expressive journals for emotional well-being. Rich input options (text, color, scale, voice), beautiful visualization of trends, and absolute privacy — the data never leaves the device unless the user explicitly exports it.

06 Daily Inventory & Stock

Smart local inventory management for home, kitchen, hobby collections, small business, and field use. Barcode scanning, expiration alerts, usage statistics — all running natively with optional encrypted export.

How our apps monetize — transparently

IAA — In-App Advertising

Ads are served through globally compliant networks: Google AdMob, Google Ad Manager, Meta Audience Network, Unity Ads, AppLovin, ironSource, Digital Turbine, Chartboost, Vungle, Pangle (by ByteDance), InMobi, Verizon Media, Smaato, Start.io, Tapjoy, AdColony, Mintegral, Liftoff, Moloco, and platform-native Apple Search Ads / iAd. Formats: banner, interstitial, rewarded video, native, app open, MREC. All ad SDKs are configured for ATT, Privacy Sandbox, GDPR TCF v2.2, and CCPA opt-out signals.

IAP — In-App Purchase

Subscriptions, lifetime unlocks, and consumable features are processed through Apple App Store In-App Purchase, Google Play Billing, and RevenueCat for unified cross-platform receipt validation. Refund, subscription management, and family-sharing flows are fully implemented per platform guidelines.

Compliance Stack

Every shipped app is built against Apple's App Store Review Guidelines, Google Play Developer Policy, ATT Framework, Privacy Sandbox, GDPR, CCPA/CPRA, LGPD, COPPA, China's PIPL, and the IAB Transparency & Consent Framework. SDKs are versioned, allow-listed, and disclosed in every product's privacy nutrition label.

Services for other teams

We open up our process to founders, studios, and brand teams who want to build privacy-respecting mobile products without learning the hard way. Engagements can be modular or end-to-end.

Product Design Consulting

From problem framing to interface polish. We help you shape the right product — research, IA, wireframes, design systems, glass & neumorphic style sheets, motion guidelines, and platform-specific UI audits. Output is a build-ready design package.

Full-Cycle App R&D

Native iOS (Swift / SwiftUI) and Android (Kotlin / Jetpack Compose) development from technical specification to App Store / Google Play launch. Includes architecture, modularization, performance engineering, testing, CI/CD, and post-launch iteration.

Privacy Engineering

On-device architectures, AES-256 encryption, keychain integration, ATT & Privacy Sandbox compliance, GDPR/CCPA consent flows, data minimization audits, and Privacy Manifest preparation. We help you build trust as a feature.

Monetization Engineering

Strategic integration of IAA ad networks (AdMob, Meta Audience Network, Unity Ads, AppLovin, Pangle, Mintegral) and IAP (App Store, Google Play, RevenueCat). Includes waterfall & bidding setup, mediation configuration, ATT prompts, and user-experience optimization.

App Store Compliance Audit

Pre-submission review of your iOS / Android app against current App Store Review Guidelines and Google Play Developer Policy. We identify rejection risks in metadata, privacy labels, IAP, SDK allow-listing, and content guidelines before you submit.

Team Augmentation

Need senior native developers, a privacy specialist, or a product designer for a sprint? Our team members embed with yours — full-time, part-time, or project-based — bringing immediate expertise and battle-tested workflows.

Tell us what you're building.

Most engagements start with a 30-minute discovery call. We'll listen, suggest a path, and quote honestly.

Book a Discovery Call