# Tethr App vs Bio Log

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.

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.

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.

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

## The numbers

| Metric | Tethr App | Bio Log |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/tethr-app/id6761250272/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/bio-log-peptide-tracker/id6773158529/reviews) |
| Number of ratings | **3** | 2 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 3 weeks |
| Monetization | **Free** | Freemium |
| Size | 41 MB | 5 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [CEDIQUE JAVIERE HENRY](https://appshunter.io/developer/1888395958) | [alexander rieger](https://appshunter.io/developer/1839352038) |

## What reviewers say

### Tethr App

[App page](https://appshunter.io/ios/app/tethr-app/id6761250272)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Bio Log

[App page](https://appshunter.io/ios/app/bio-log-peptide-tracker/id6773158529)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bio Log Membership | $3.99 | per month |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*