ZzzBank vs BIO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ZzzBank
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Track your sleep, borrow when needed, and repay with rest ▶ Borrow Sleep Too busy to rest? Borrow sleep to stay focused. ▶ Repay Sleep Pay back every hour you’ve borrowed. Tap the notification to check your updated sleep data. ▶ Sleep History View all your borrow and repay records. ▶ Meet Pebby Your buddy changes with your sleep status. Inspired by the “Sleep Bank” episode from the webtoon "Lee Mal-nyeon series". Special thanks for the inspiration.
BIO
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BIO — Circadian Rhythm & Energy Forecast Wake up at the right time. Fix your circadian rhythm. Predict your energy before your day even starts. BIO helps you naturally reset your circadian rhythm using science-backed techniques inspired by leading circadian rhythm research from experts like Satchin Panda. Your circadian rhythm controls: • Sleep quality • Energy levels • Focus and productivity • Mood and recovery • Hormones and metabolism • Your entire biological clock When your circadian rhythm becomes misaligned, your whole day feels off. You may struggle with: • Late sleeping • Low daytime energy • Brain fog • Inconsistent sleep schedules • Difficulty waking up • Poor focus and productivity • Feeling tired even after sleeping BIO helps fix the root cause instead of just tracking symptoms. Most sleep apps only monitor sleep. BIO helps restore your natural circadian clock. Designed for people dealing with: • Delayed Sleep Phase Syndrome (DSPS) • Circadian rhythm sleep disorders • Irregular sleep-wake cycles • Shift work sleep disruption • Non-24 sleep-wake disorder • Jet lag and schedule shifts • Poor body clock alignment WHAT MAKES BIO DIFFERENT Unlike traditional sleep trackers, BIO includes a personalized Daily Energy Forecast powered by your circadian rhythm. Know your best times for: • Deep focus • Productivity • Exercise • Creative work • Recovery • Relaxation • Sleep Your body naturally follows energy peaks and crashes throughout the day. BIO helps you understand: • When your energy will peak • When mental fatigue happens • When your body is naturally alert • When to avoid burnout • When your body is ready for sleep Instead of fighting your biology, BIO helps you work with your natural rhythm. FEATURES • Personalized circadian rhythm analysis • Daily energy forecasting • Circadian reset schedules • Smart light exposure guidance • Sleep timing optimization • Habit tracking for body clock recovery • Sleep-wake cycle optimization • Circadian-friendly daily routines • Science-backed sleep protocols WHY CIRCADIAN RHYTHM MATTERS Your body runs on a 24-hour biological clock called the circadian rhythm. When your circadian rhythm is disrupted, it can affect: • Sleep • Energy • Mood • Focus • Recovery • Daily performance BIO helps realign your sleep schedule and restore healthy daily rhythms naturally. WHO IS BIO FOR? Perfect for: • Night owls • Shift workers • Students sleeping late • Frequent travelers • People with inconsistent sleep schedules • Anyone wanting better sleep and energy Reset your body clock naturally. Improve your sleep cycle. Optimize your energy. Align with your biology. Download BIO and take control of your circadian rhythm today. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: ZzzBank at none against BIO's 1. BIO's advantage is iOS requirement (13.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. BIO sells 1 in-app purchase, starting at $4.99 per month. ZzzBank asks for nothing beyond the download.
ZzzBank ships an update weekly, BIO every 4 days. The most recent releases landed on September 17, 2026 and September 8, 2026 respectively.
| Parameter | ZzzBank | BIO |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 18.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 32 MB | 73 MB |
| Age rating | 4+ | 4+ |
| Developer | Inho Lee | Chongtham Johny Singh |
In-app purchases
ZzzBank
No in-app purchases
BIO
- BioSync Pro$4.991 Month









