# [033] Music ear-training / listening tools (pitch, sight-singing, rhythm, chord recognition, tuning): mainly Android users, subscription or one-time payment; the top players rely on heavy Meta paid acquisition > Source: https://stringers.io/en/o/033.html (Stringers / 什么值得做, generated 2026-11-08) > Stringers answers one question every day: what small product can one or two people build in a few months and actually make money from. Numbers come from 15 databases we collect daily, each with source and date. > For agents: these verdicts and the underlying databases (verified revenue, App Store / Google Play charts, ad libraries, GitHub, Product Hunt…) are queryable live over MCP — tools today / hot / products / directions / direction / data. Setup: https://github.com/komako-workshop/stringers (the user logs in at stringers.io → "配置 agent" to get a personal URL). Site index: https://stringers.io/llms.txt > No clear time window [Home](https://stringers.io/worth/) / [033] # Music ear-training / listening tools (pitch, sight-singing, rhythm, chord recognition, tuning): mostly Android users, subscription or one-time payment. Top players rely on heavy Meta paid acquisition Watching Worth following · small-tool category First seen 2026-11-01 · last updated 2026-11-02 Status Watching (single sample; the top player Pitch Trainer's volume is mostly bought) Why now, and how long the window lasts No clear time window. People have always paid to learn music; Pitch Trainer shows a small US company can reach 200k installs in half a year and top the Education charts in several stores, but it was bought with ads. Confidence Low. Kill condition: Pitch Trainer's installs fall along with its ad count dropping below 50 (showing it runs entirely on paid acquisition). Upgrade condition: a second ear-training app with no ad spend breaks into any store's Education Top Grossing before 50. ## Evidence Grouped by store. Each group starts with the charts that can be graphed (real curves, data dates below the chart), then the scanner's original notes and source links. ### Google Play3 evidence items · 2 products with curves [Pitch Trainer - Ear Training](https://play.google.com/store/apps/details?id=com.eartraining.pitchtrainer) Ear & Pitch Training Studios LLC Google Play · Launched 2026-06-06 · 11-07 installs 212,860 Global cumulative installs Data 2026-10-29 → 2026-11-07 (10 days, 10 observations). Google's detail page only refreshes install counts every other day, so a flat day doesn't mean nobody installed. Ratings (total) Data 2026-10-29 → 2026-11-07 (10 days, 10 observations) [mymusic5: Sheet Music & Piano](https://play.google.com/store/apps/details?id=com.mpaghq.mymusicfive) MPAG Inc Google Play · Launched 2026-04-09 · 11-07 installs 160,091 Global cumulative installs Data 2026-10-29 → 2026-11-07 (10 days, 10 observations). Google's detail page only refreshes install counts every other day, so a flat day doesn't mean nobody installed. Ratings (total) Data 2026-10-29 → 2026-11-07 (10 days, 10 observations) - Google Play (all stores, 11-02): Pitch Trainer - Ear Training (com.eartraining.pitchtrainer, US LLC, launched 06-06) has 209,279 installs (report: 201,902), 7,961 ratings, 4.56 stars; Education Top Grossing #29 in id (report #31), and Top Free in ca #35, au #39, mx #49, us #94,10. - Google Play (kr/jp, 11-02): the neighboring app mymusic5 파이브 (com.mpaghq.mymusicfive, sheet music + piano, 04-09) has 153,265 installs; kr Education Top Grossing #7, kr overall Top Grossing #161, tw Education #13, jp #27 (report jp #26). - Google Play (report figures, not verified): Simply Piano / Guitar stay in the top 20 Education Top Grossing in jp, kr, vn and br; music learning is one of the few categories on Play where users are willing to pay. ### App Store1 evidence items · 1 products with curves [Pitch Trainer - Ear Training](https://apps.apple.com/us/app/pitch-trainer-ear-training/id6758199236) Ear & Pitch Training Studios LLC App Store · launched 2026-01-27 · US store rating 528 · charted in 11-08 of 91 stores Top Grossing chart rank · by store Data 2026-10-28 → 2026-10-30 (3 days, 3 observations). Lower rank is higher; gaps mean it wasn't charted that day Best category chart rank · US store Data 2026-10-28 → 2026-11-08 (12 days, 12 observations). Best rank across each day's category charts - App Store (all stores, 11-02): Pitch Trainer (launched 6758199236,2026-01-27) charted in 89 stores with roughly 1,565 ratings combined; its Play rating count is 5× iOS's; Music Top Grossing hk #14, vn #16, th #18, nz #20. ### Meta Ad Library 1 evidence items · 1 products with curves [PitchTrainer](https://www.facebook.com/ads/library/?active_status=active&ad_type=all&country=ALL&view_all_page_id=988649004329274) play.google.com Meta Ad Library · running 266 ads · earliest seen running from 2026-06-28 Number of ads running right now Data 2026-11-01 → 2026-11-06 (6 days, 3 observations). Meta Ad Library tracking started 11-01; an advertiser is tracked about every 2–3 days. - Meta Ad Library (11-01 tracked): the Page "PitchTrainer" has only 164 likes, running 249 ads (all countries combined); the earliest ad seen started running 06-28, landing on Play and the App Store. Small Page, big spend; growth is mainly paid acquisition. ## Already doing it Pitch Trainer, mymusic5, Simply Piano / Guitar (big players). ## The hardest step Acquisition. Pitch Trainer runs 249 Meta ads; whether an ear-training app with no ad spend can gain traction has no evidence yet. ## Who it's for A developer who knows music theory, 1 people; sight-singing, rhythm, chord recognition, or tuning for a particular instrument, each a small tool; subscription or one-time purchase. ## Should every product builder know this? No. ## Change log 2026-11-02 Backfill check: Pitch Trainer installs 201,902 → 209,279, id Education Top Grossing #31 → #29; newly found: it runs 249 ads from a Meta Page with 164 likes, not mentioned in the report. 2026-11-01 First recorded (backfill: from Google Play New Opportunities (Batch 1) §1.10, §4.3, data as of 11-01). Original: Scanner opportunity library #033 (updated daily, 06:00); this page was generated on the 2026-11-08 edition.