Sarafis Abacus — a teacher-ready number-sense app for Grades 1–2. Children learn make-10, compose/decompose, and place-value with a dual-color abacus (5/10) and guided 5–7′ lessons. MVP is English-only (architecture i18n-ready).
Engagement: Fixed-price with milestones + PAID test task. Start ASAP.
What you’ll build (MVP) 1. Abacus Engine (“rekenrek+”) • 8–10 rails, dual-color 5/10, smooth gestures/animations (60 fps). • Automatic exchanges: 10 ones→1 ten, 10 tens→1 hundred, etc., with visual/audio cues. • Place-value indicators (Ones/Tens/Hundreds/Thousands). 2. Three modes • Guided micro-lessons (5–7′). • Practice/Challenges (timed rounds, streaks, badges). • Sandbox for teachers incl. projector “curtain” to hide/reveal. 3. Four initial lesson units • Counting & Number Sense; Compose/Decompose; Make-10 (over the ten); Add/Subtract 2-digit (with/without regrouping). 4. Teacher basics • Quick progress overview (per skill), export simple PDF handouts. 5. App qualities • Offline-first (usable with no signal; sync when online). • Accessibility: large targets; left/right-hand toggle; color-blind-safe patterns; haptics & audio cues. • No ads. Child-friendly flows.
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