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beSur

A visual, AI-guided way to learn Indian classical music.

CLIENTMarva AI LLP·CATEGORYMusic / EdTech·PLATFORMSiOS & Android·YEAR2025
beSur app on iPhone with piano keys and laptop in background

beSur is an AI-powered harmonium accompaniment app built for Marva AI LLP, an early-stage edtech serving learners of Hindustani classical vocal music. Their audience: beginner-to-intermediate students who practice between guru lessons and need a structured, intelligent companion.

Off-the-shelf audio libraries couldn't deliver the sub-millisecond latency or pitch precision Indian classical music demands, and existing music apps treat practice as a generic metronome experience rather than the structured, raga-driven discipline it actually is.

App StoreGoogle Play
Hands playing beSur piano on iPhone
beSur on Android phone at music production desk

iOS & Android

Shipped both stores from one codebase

<1ms

Audio latency on the custom engine

60fps

Pixel-perfect animation on both platforms

12 ragas

Covered in the launch curriculum

What we did

01

One codebase, two platforms

Flutter let us ship pixel-perfect, 60fps experiences on both iOS and Android from a single Dart codebase — halving development time without compromising on native feel.

02

A custom-built audio engine

We engineered our own audio engine from scratch — built for sub-millisecond latency, real-time harmonium synthesis, and seamless tanpura drone playback. No third-party library hit the bar.

03

Music meets interaction design

Every swar lights up, every note animates, every raga unfolds visually. We turned centuries-old notation into an interactive, touch-first experience that makes practice feel like play.

beSur colorful piano keys on wooden bench

Built with

  • FlutterOne codebase, pixel-perfect 60fps on iOS and Android.
  • DartStrong typing and AOT compilation for native-grade performance.
  • Custom audio engineBuilt from scratch for sub-millisecond latency and real-time harmonium synthesis.
  • iOS & AndroidShipped to both stores from a single source of truth.
See all of Brewnbeer's capabilities
beSur Play Store listing on Pixel phone
beSur piano interface on iPhone lying on concrete

We built beSur to close the gap between guru and student, so anyone with a phone and an instinct for raga can practice with intelligence on the other side of the screen.

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