Comparison

Tethr App vs Bio Log

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Tethr App

This app helps service providers manage their schedules and client bookings. Clients can book sessions, view appointments, and track their activity. It's designed for ongoing relationships with features like mobile-first scheduling and payment-enabled booking.

Highlights
  • Provider availability management
  • Client management
  • Session plan tracking
  • Booking and appointment management
  • Payment-enabled booking
  • Mobile-first scheduling
Features
Read full description

Tethr is a mobile scheduling and session management app for service providers and their clients. Providers can manage availability, clients, session plans, and bookings, while clients can book sessions, view upcoming appointments, and track their session activity. The app is designed for ongoing provider-client relationships and supports mobile-first scheduling, appointment management, and payment-enabled booking flows for session-based businesses.

About

Bio Log

This app helps you meticulously track peptide doses, vial details, and personal notes in a centralized journal. It offers daily views, logging capabilities, and history search, with optional AI assistance for summaries and organization. Records are stored locally for your control.

Highlights
  • Schedule and dose tracking
  • Vial inventory management
  • Injection site mapping
  • Journal search and filtering
  • AI-powered note organization
  • Local data storage
  • Data export
Read full description

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

Tethr App3 screens
Bio Log4 screens

Verdict

The call

The clearest difference is in-app purchases: Tethr App at none against Bio Log's 1. Tethr App also leads on update cadence (every 5 days vs every 3 weeks) and device support (3 vs 1). On price, rating, ratings volume and ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Bio Log sells 1 in-app purchase, starting at $3.99 per month. Tethr App asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Tethr App against 5.0 for Bio Log. Both are backed by a comparable volume of ratings — 3 and 2 respectively.

UpkeepUpdate frequency

Tethr App ships an update every 5 days, Bio Log every 3 weeks. Both last shipped on October 31, 2026.

Scorecard5 real differences · 4 level
Tethr App versus Bio Log: the parameters behind the verdict, then further details
ParameterTethr AppBio Log
PriceFreeFree
Rating5.0 (3 ratings)5.0 (2 ratings)
Number of ratings3 — better2
Update frequencyEvery 5 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.1 — better17.0
Further details — not scored
Size41 MB5 MB
Age rating4+17+
DeveloperCEDIQUE JAVIERE HENRYalexander rieger

Customer experience

Tethr App

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bio Log

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Tethr App

No in-app purchases

1 purchases

Bio Log

Subscriptions1
  • Bio Log Membership$3.991 Month

Questions

Is Tethr App free?
Tethr App is free to download, with no in-app purchases.
Is Bio Log free?
Bio Log is free to download, with in-app purchases available.
Which has better reviews, Tethr App or Bio Log?
Tethr App and Bio Log are both rated 5.0 out of 5 on the App Store, from 3 and 2 ratings respectively.
Do Tethr App or Bio Log have ads?
Neither Tethr App nor Bio Log shows ads.
Which is updated more often, Tethr App or Bio Log?
Tethr App ships an update every 5 days, and Bio Log every 3 weeks. Most recently, Tethr App was updated on October 31, 2026 and Bio Log on October 31, 2026.

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