---
title: "The narrow path — Kapell"
description: "Genre pages now browse Apple's whole catalog, ranked by your storefront, plus a lot more artists connected to their records."
canonical: "https://kapell.fm/blog/2026-09-25-a-bit-of-accuracy/"
published: "2026-09-25"
---

Platform September 25, 2026

# The narrow path

Tryin' to tell my folks that flow, it ain't easy - Blu

BY THE NUMBERS PLATFORM · LIVE

API SURFACE catalog

RECYCLED BARCODE FIXES ~4,000; 0.31%

DUPE ALBUM ISRC FIXES ~1,700; 1.7%

DUPE TRACK ISRC FIXES ~21,050; 0.23%

GUARD… GUARDS? ~1,829

Kapell’s underlying API is usually moving in lock-step with the client, but the nature of the queries and such mean that sometimes I’m fixing things unrelated to specific client features. [The 1.4.1 release’s banner track-level credits feature](https://kapell.fm/blog/2026-09-25-release-141) was already supported by the API, for example.

## Small Accuracy Improvements

I don’t remember what triggered this investigation, but I bumped into some problems that caused about 28,600 incorrect matches (0.12% of the 24.1 million Apple albums, songs and artists Kapell matches). Most of the problems stemmed from [ISRCs](https://en.wikipedia.org/wiki/International_Standard_Recording_Code).

- **Albums** - Albums sometimes do not have a [barcode](https://en.wikipedia.org/wiki/Barcode), at which point Kapell has to deploy heroic measures to match it. Specifically, looking for a collection of ISRCs as the big hint of an album’s identity.
- **Tracks** - ISRCs are sometimes duplicated (or incorrect) and point to wildly different songs.

These duplicated ISRCs confused the various matching strategies Kapell’s API uses to tie Apple’s catalog to 3rd-party data. I added song duration and title checks to avoid picking the wrong things.

Unrelated, attribution of some works were being lumped under the *composer* or the *writer* was being lumped into the performer or attributed to the wrong person. I added guards around the life of an artist, making sure long-deceased composers don’t occlude modern performers and being more specific about artist name matching band names.

Kapell — for macOS

Press play. Meet the band.

A deeper way to play the Apple Music® library you already have — the credits, samples, and history, surfaced as the music plays. Buy it once, own the whole thing. No subscription.

[Download](https://apps.apple.com/us/app/kapell/id6779394524) [See other journal entries](https://kapell.fm/blog)