Renight (Munice) tops Japan App Store Health chart on sleep-debt pitch

Renight (リナイト, formerly Nightly) is a subscription sleep app from Seoul/San Francisco startup Munice: it plays layered monaural beats meant to entrain brainwaves from awake Beta to deep Delta states, adapts each session from a four-question state check-in, and sends a wake-up report tracking 'sleep debt'.

AI-personalized monaural-beat audio, pitched to Japan's sleep-debt youth, could open wallets in a market where Sleep Cycle and ShutEye never did.

Pre-A2 of ₩2.2B (about $1.6M) closed 2024-12-31, from Schmidt (Korea), Z Venture Capital (Japan) and Samsung Next (US).

Founder Kwon Seohyeon ('Shawny') is herself a long-term insomnia sufferer who used sleeping pills and interviewed 120 insomniacs before designing the product. Munice launched Nightly in April 2022; it became a steady Korean App Store Health & Fitness #1 and had about 700K users worldwide by the end of 2024.

An early US push built on campus events converted poorly, so Munice turned to culturally closer Japan. It kept the state-based check-in and wake reports, priced subscriptions at ¥900/month or ¥9,000/year, and aimed ads at young students and workers with lines like 'check your sleep debt' and 'wake up without an alarm'. In 2024 installs grew from 91K to 782K (8.6x) while paywall reach rose from 61% to 89.5% via Adapty and MRR doubled. By 2026-01-31 the app was #1 in Japan iOS Health & Fitness downloads and #3 by grossing, with about $312K in trailing-30-day revenue, 96% from Japan — against roughly $50K/month for Sleep Cycle and under $10K for ShutEye in Japan.

As of 2026-03-13, Renight (renamed from Nightly) reports 1.6M users worldwide, holds the #1 spot on the Japanese App Store Health & Fitness chart, and has been featured as App of the Day in 151 countries. Chinese industry coverage notes Japanese reviews remain split on effectiveness and pricing, Pokémon Sleep still earns about $3.13M/month in Japan, and Munice's stated goal is global sleep-tech leadership.

Founder Kwon Seohyeon lived the problem — a sleeping-pill user who interviewed 120 insomniacs — which kept the product focused on falling asleep, not on generic relaxation.

Renight's mechanism (monaural beats that claim to steer brain state) differed from the tracking-and-suggestion apps already failing to monetize Japan, giving the ads a concrete promise.

Instead of competing on 'calm', Munice sold young Japanese workers and students a fix for sleep debt with alarm-free mornings — buyer-showcase creatives that matched the audience's anxiety.

A failed US campus push pushed the team to Japan, where similar work culture made the value proposition and pricing (¥900/month) click.

Data discipline amplified the bet: centralized dashboards lifted paywall reach from 61% to 89.5% and doubled MRR while installs grew 8.6x in 2024, funding the chart run.

A market can be monetizable without being brand-driven: reposition the same category around a specific anxious audience, and the category leader's failure becomes the entrant's opening.

As of 2026-03-13, Munice reports 1.6M users worldwide, a #1 Japanese App Store Health & Fitness chart position for Renight (renamed from Nightly), and App of the Day features in 151 countries. Chinese industry press covering the run notes Japanese user reviews remain split over effectiveness and pricing, that Pokémon Sleep still takes about $3.13M/month in Japan, and that Munice's stated ambition is to become the world's leading sleep-tech service.