Case study · Duulya

Duulya: from idea to paying customers in 2 days

A personal song in Mongolian, with a loved one's name and your shared memories, sent as a gift.

Visit duulya.appBuild yours with us
Start to first payments
2 days
Songs written with AI
590+
Paid songs delivered
45

Counted on 28 October 2026

How it was built

From idea to paying customers in 2 days

Built with

  • Next.js
  • Supabase
  • QPay
  • Google Gemini
  • Lyria
  • PostHog
  • Sentry
  • Meta Ads

  1. Day 1 · 23 Oct 2026

    • PeopleIdea picked from the weekly research.
    • AgentsAI engines tested blind: Lyria beat ElevenLabs at Mongolian singing, Gemini beat Claude at lyrics.
    • AgentsPlan, flows, rules, name options and brand directions written.
    • PeoplePlan approved; name Duulya and the brand picked.
    • Agentsduulya.app bought and set up.

  2. Day 2 · 24 Oct 2026

    • AgentsFull flow working: AI lyrics, a free 30-second preview, two full versions.
    • PeopleLive on duulya.app. First real QPay payments: 8 songs paid and delivered.
    • AgentsLaunch kit made overnight: 10 ads, 5 posts, 3 video scripts.

  3. Day 3 · 25 Oct 2026

    • AgentsTracking live: funnel, errors, Meta Pixel and Conversions API.
    • AgentsFull test round: no critical issues; the high and medium ones fixed the same day.

  4. Day 4 · 26 Oct 2026

    • PeopleAd plan approved; video ads switched on.
Next case studyGrantFit: a full subscription app, first version in 4 days
Duulya: from idea to paying customers in 2 days · Tably LLC