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.
#29B6F6 NumberVerse is a math adventure where you build a living world using math! Use fraction bars to construct bridges, balance scales to solve equations, and coordinate grids to map your world. As you get better, the visual tools gradually fade away and you start writing real math notation. The world it
What's inside
World Building
Construct paths, bridges, buildings, and mechanisms using math. Need a bridge that is three-fourths of a river wide? Build it with fraction bars! Need a tower a
Visual Math Tools
Use hands-on math tools like fraction bars, area grids, balance scales, and number lines. These tools make abstract math concepts visible and touchable. You can
The Peel-Back
Here is the cool part: as you master a concept, the visual tools gradually become see-through and formal math notation appears underneath. You naturally transit
Skill Tree
Track your progress through a skill tree that shows which math concepts you have mastered and which ones are next. Each skill unlocks new building abilities in
How Numberverse 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
Numberverse 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
Numberverse 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