Special Interest
CityForge
Players design buildings and plan cities that must satisfy structural physics, environmental constraints, and citizen needs. Start with single buildings (understanding loads, materials, foundations), progress to neighborhoods and full cities with infrastructure, zoning, and sustainability challenges. The only STEM-focused architecture and urban planning app on iOS for ages 9-14.
Meet your mentor
Every Spark & Anvil app has a friendly mentor character that demonstrates, praises, and patiently scaffolds learning. On-device AI personalizes the mentor's responses to your kid's progress — never connecting to a server, never collecting data.
#FFA726 CityForge lets you be an architect and city planner! Design buildings that can actually stand up using real structural physics, then plan entire cities with roads, parks, water systems, and more. Every building you design has to satisfy real engineering rules, and every city you plan has to keep its
What's inside
Building Designer
Design buildings by choosing materials (wood, brick, steel, glass), placing walls and floors, and adding details. The physics engine tests your building -- if i
City Planner
Lay out a city grid with zones for homes, shops, and parks. Add infrastructure like roads, water pipes, and power lines. Balance your budget and keep citizens h
Commissions
Take on design challenges from virtual clients. They might want a tall tower, a cozy library, or an eco-friendly school. Meet their requirements while staying w
Sustainability Challenges
Design buildings and cities that are good for the environment. Use solar panels, green roofs, and smart water systems to reduce your environmental impact.
How CityForge handles your kid's data
- ✅ All progress, settings, and AI-generated content stays on the device
- ✅ No analytics, no tracking, no third-party SDKs
- ✅ No ads, no in-app purchases — you pay once
- ✅ COPPA compliant under the 2026 FTC amendments
- ✅ Parental controls + session limits + content filters built in
CityForge runs on ForgeKit — the open-source Swift Package Manager framework that powers every Spark & Anvil app. ForgeKit ensures consistent accessibility, COPPA compliance, and design language across the portfolio, so your kid's progress and preferences feel coherent across every app they touch.
Coming to the App Store
CityForge is in active development. Email us to hear when it ships — no marketing, no spam, just a one-shot launch announcement.
Email me at launch