3D Solar System vs Assess Hub Three: which is better? (2026)

3D Solar System

Real-time 3D solar system simulator powered by NASA/JPL data, with eclipse predictions, live ISS tracking, and an AR SkyView constellation finder.

3D Solar System is a real-time 3D simulator of the solar system built on precise NASA/JPL orbital data. It shows the actual current positions of the eight planets and major moons, and lets you rotate, zoom, and follow any body in real time or at accelerated time scales. A dedicated Real Scale mode renders true relative sizes and distances instead of the exaggerated proportions used for visibility in normal view. The app includes a solar and lunar eclipse calendar covering 2024 through 2100, live tracking of the ISS, Hubble, and James Webb Space Telescope, and a near-Earth asteroid overview highlighting potentially hazardous objects. SkyView, a newer feature, uses the device camera, gyroscope, and GPS to match constellations to the real night sky above the user, with a constellation browser and time-travel controls to preview the sky at any date. Available as a web app and a native Android app, with Korean and English support.

Assess Hub Three

Assess Hub

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Assess Hub is a multi-tenant SaaS assessment platform for high schools. Each institution gets its own subdomain and a dedicated database schema, so student data, quizzes, and scores stay strictly isolated on shared infrastructure. I designed and built the full stack: Next.js App Router frontend and API, MongoDB schema-per-tenant data model, Redis-backed sessions, and role-based access for platform super admins, institution admins, and students. Admins can manage subjects, create quizzes with mixed question types (multiple choice, true/false, short answer), and grade work with auto-grading for objective questions plus a manual flow for short answers. Students take quizzes one question at a time with a fast, classroom-ready UX and see running scores on a dashboard. What makes this special is the tenancy model. Tenant identity is resolved at the edge from the hostname never trusted from client input alone and every read/write goes through that institution’s schema. Cross-tenant isolation is treated as a release gate, with dedicated isolation and answer-key leakage tests so one school’s data cannot leak into another. This wasn’t just a CRUD quiz app; it was an end-to-end product architecture: registration that provisions a tenant schema, secure auth, graded assessment workflows, and production-minded patterns for a real multi-school SaaS.