F4L vs Bio Log
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
F4L
Access fitness programs and track your progress with this health and fitness application. Features include offline synchronization and personalized content. Manage your subscription easily through your account settings.
- Progress tracking
- Offline sync
- Subscription access
- Personalized content
- Account management
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Fitness the natural way. INFORMATION ABOUT THE APP AND PURCHASE OPTIONS By signing up, you will get access to subscription(s) that include features such as progress tracking, and offline sync. The download of F4L is free of charge. No free trial offered. Should you use F4L app to access in-app content via available subscription(s), a payment will be charged to your credit card through your App Store account . A subscription renews automatically unless canceled at least 24 hours prior to the end of the subscription period. There is no increase in price when renewing. Subscription(s) can be managed and auto-renewal turned off in Account Settings in the App Store after purchase. Read our full Terms of Service and our Privacy Policy: https://passion.io/terms-of-service https://passion.io/privacy-policy
Bio Log
This app helps you meticulously track peptide doses, vial details, and personal notes in a centralized journal. It offers features for logging entries, managing injection sites, and reviewing historical data. Optional AI assistance can help organize notes and generate summaries.
- Dose and vial tracking
- Injection site mapping
- Journaling with notes
- History search and filtering
- Vial inventory management
- AI-powered summaries
- Data export
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Keep your peptide records clear, organized, and easy to review. Bio Log brings your schedules, dose entries, vial details, and personal notes into one focused journal. SEE YOUR DAY View scheduled entries and what you’ve already recorded. Keep reminders connected to the profiles you create. LOG WHAT HAPPENED Record an entry as taken or skipped. Add the amount, time, injection site, and notes you want to keep. Review your entry before saving. Choose a recorded injection site on the front-and-back body map and see which sites appear in your recent history. FIND YOUR HISTORY Search your journal by peptide or note. Filter taken and skipped entries, review earlier records, and make corrections when needed. Remove profiles from your active library without losing their history. Restore them from Archived whenever you need them. KEEP VIAL DETAILS TOGETHER Save vial amounts, lot information, and storage notes. See remaining inventory estimates based on your saved records. ADD CONTEXT Keep symptoms, lab results, and progress photos alongside your tracking. Review summaries of your own entries. BIO LOG AI Ask questions about your journal, organize notes, and review optional AI summaries in a clean conversation view. Draft logs remain yours to review and confirm before saving. YOUR RECORDS, YOUR CONTROL Journal records are stored on your device. Export your tracking records when you need them. Optional AI features use an online service with your permission. MEMBERSHIP Download Bio Log to explore the demo. Personal tracking and the full feature set require an auto-renewing monthly Bio Log Membership. Payment is charged to your Apple Account. Your subscription renews automatically unless canceled at least 24 hours before the current period ends. Manage or cancel your subscription in App Store account settings. Bio Log is for personal tracking and organization. It does not provide medical advice, diagnosis, treatment, dosing instructions, peptide recommendations, or sourcing advice. Consult a qualified healthcare professional before making medical decisions. AI-generated summaries may be incomplete or inaccurate. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://biolog-ai-backend.vercel.app/api/privacy
Screenshots
Verdict
The clearest difference is ads: Bio Log at none against F4L's shown. F4L's advantage is device support (3 vs 1) and ratings volume (6 vs 2). On price, rating, in-app purchases and monetization model 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. F4L sells 1 in-app purchase, starting at $15.00 per month and Bio Log sells 1 in-app purchase, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 5.0 for F4L against 5.0 for Bio Log. Both are backed by a comparable volume of ratings — 6 and 2 respectively.
| Parameter | F4L | Bio Log |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (6 ratings) | 5.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 6 — better | 2 |
| Update frequency | — | Every 2 weeks |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 61 MB | 5 MB |
| Age rating | 4+ | 17+ |
| Developer | BAYLOR CONDE | alexander rieger |
Customer experience
F4L
Bio Log
In-app purchases
F4L
- Fit 4 Life | All Access$15.001 Month
Bio Log
- Bio Log Membership$3.991 Month









