Dual Vedic-Abacus Calculator App

I want to bundle two powerful study aids into a single mobile experience: a Vedic-maths calculator that performs lightning-fast arithmetic using Vedic sutras, and a virtual Abacus that mimics bead manipulation on screen. Alongside the calculators, the app should offer concise “tips & tricks” cards geared toward bank, SSC, CAT, and other competitive-exam aspirants so users can learn shortcuts while they practise.

Scope of work
• Build one universal code-base that compiles cleanly for both iOS and Android stores. I’m open to Flutter, React Native, Kotlin Multiplatform—or a native Swift + Kotlin pair if you feel that delivers smoother performance.
• Design an uncluttered interface that lets learners switch instantly between the Vedic and Abacus modes.
• Implement step-by-step guidance: onscreen cues for Abacus bead moves, and formula pop-ups for Vedic methods.
• Add a lightweight tips section searchable by topic (e.g., multiplication shortcuts, division hacks, rapid square roots).
• Make sure calculations are precise, lag-free, and work offline once the app is installed.
• Prepare release-ready builds and simple deployment notes so I can push future updates myself.

Acceptance criteria
1. App installs and runs without crashes on current iOS and Android versions.
2. Vedic calculator completes the common arithmetic operations using correct sutras; Abacus view animates bead shifts accurately.
3. Tips section loads instantly and supports bookmarking favourites.
4. Clean, documented code deposited in a private Git repo.

When you respond, please focus on the relevant experience you have building educational or calculator-style apps and the tech stack you would use to hit the above goals.