Constant Scale vs Biostacks
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Constant Scale
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Software introduction: This kind of application can transmit data to electronic scale, which contributes great help to healthy life. Users can easily manage their own personal health data anytime and anywhere. Key functions: 1)Data transmission from software to scale through Bluetooth. 2)Automatically transmit and save personal health data. 3)Automatically judge the standard of personal health data. 4)Automatically create personal health data graph. 5)Support save health data to Apple's health kit 6) support cloud cache data 7) suport french,german,italian,korean,portuguese,turkish,russian,spanish
Biostacks
Easily manage your supplement intake with barcode scanning, AI assistance, and detailed insights. Track routines, monitor nutrient coverage, and analyze your stack's effectiveness and cost. Prioritizes user privacy with offline functionality and optional iCloud sync.
- Barcode scanning for supplement library
- AI-powered supplement routine analysis
- Customizable daily and cycle schedules
- StackScore for routine quality
- Potential interaction warnings
- RDA coverage and nutrient overlap analysis
- Mood, energy, and sleep trend tracking
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Biostacks helps you track, understand, and improve your supplement routine while keeping your data private. Build your supplement library by: • Scanning barcodes with your camera • Searching NIH DSLD and Open Food Facts data (well-known brands and popular supplements available offline) • Entering supplements, doses, and nutrients manually • Asking the built-in Apple Intelligence assistant (iPhone 15 Pro and newer) • Asking your own AI assistant with a ready-made copy-and-paste prompt Create routines and schedules that match how you take things: • Daily, specific weekdays, or on/off cycles (like 5 days on, 2 off) • Multiple times of day, from a morning multivitamin to an evening magnesium • Peptide support: vial size, reconstitution volume, and a draw-volume calculator Then get insights into your stack: • StackScore, a 0 to 100 quality score for your whole routine • Potential interactions based on public research, each with a source link • Warnings when a nutrient total goes over its safe upper limit • RDA coverage across your vitamins and minerals • Nutrient overlaps between products • Brand quality and trust signals • Adherence history and score trends over 30, 90, or 365 days, with CSV export • Monthly cost per supplement and per stack • Running-low refill alerts Log doses with one tap, mark a whole stack taken at once, and long-press to skip a dose without breaking your streak. Reminders keep you on schedule, and smart tuning suggests a better reminder time when you consistently log late. Progress rings and streaks show your consistency day by day. You can also log a dose by asking Siri. Your day, organized: • Doses grouped into taken, due, and upcoming • A calendar of every past day, with mood dots from your check-ins • Search and filter once your stack grows • Notes on stacks and on individual supplements • Reorder stacks and items to match how you take them • Dark, light, and system themes Check in daily on your mood, energy, sleep, and focus. View your trends, run on/off experiments, and see whether a supplement moves the numbers. Correlations only appear once there is enough data behind them; Biostacks will not show you a pattern it cannot stand behind. Ask questions in the on-device AI chat: review your routine, explain an ingredient, or change your stack by describing what you want. Every suggested change appears as a review you accept or reject, with undo. Prefer your personal assistant? Copy the prompt, paste the answer back, and review the changes the same way. Privacy first: • Works fully offline • No account and no sign-up • Your health data stays on your device • Optional backup and sync to your own iCloud • Snapshots and version history, so you can roll back any change • Export everything anytime as JSON or PDF, or share a stack as plain text Everyday tracking covers dose logging, streaks, reminders, check-ins with rating trends, the library and barcode scanner, export, import, and backups. Biostacks Pro, an annual subscription with a 7-day free trial, adds StackScore insights, check-in correlations, historical trends, cost tracking, smart reminder tuning, and cloud sync. Whether you take a daily vitamin D and omega-3 or manage a full stack of supplements, nootropics, and peptides, Biostacks gives you one private place to log your intake, stay consistent, and understand how your routine fits together.
Screenshots
Verdict
The clearest difference is in-app purchases: Constant Scale at none against Biostacks's 2. Constant Scale also leads on iOS requirement (11.0 vs 15.1). Biostacks's advantage is update cadence (every 10 days vs every 4 weeks). On price, 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. Biostacks sells 2 in-app purchases, starting at $3.99 per month. Constant Scale asks for nothing beyond the download.
Constant Scale ships an update every 4 weeks, Biostacks every 10 days. The most recent releases landed on September 10, 2026 and September 18, 2026 respectively.
| Parameter | Constant Scale | Biostacks |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 4 weeks | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 11.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 150 MB | 63 MB |
| Age rating | 4+ | 17+ |
| Developer | Yiwu Chaolan Import & Export Co., Ltd. | Hmujo LLC |
In-app purchases
Constant Scale
No in-app purchases
Biostacks
- Biostacks Pro - Monthly7 Days trial$3.991 Month
- Biostacks Pro - Annual14 Days trial$24.991 Year









