# Peptify vs ThinkLeft

The clearest difference is rating: ThinkLeft at 5.0 against Peptify's 4.3. ThinkLeft also leads on ads (none vs shown) and update cadence (daily vs every 4 days). Peptify's advantage is ratings volume (23 vs 1). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Peptify sells 3 in-app purchases, starting at $4.99 per month and ThinkLeft sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ThinkLeft holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Peptify has 23 ratings behind it against 1, so its average is the more settled of the two.

Peptify ships an update every 4 days, ThinkLeft daily. The most recent releases landed on October 9, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Peptify | ThinkLeft |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (23 ratings)](https://appshunter.io/ios/app/peptify-peptide-tracker/id6760272148/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/thinkleft/id6761957491/reviews)** |
| Number of ratings | **23** | 1 |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 days | **Daily** |
| Monetization | Freemium | Freemium |
| Size | 84 MB | 7 MB |
| Requires iOS | **18.0** | 18.6 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Peptify LLC](https://appshunter.io/developer/6808306686) | [Jean Gonzalez](https://appshunter.io/developer/1892198234) |

## What reviewers say

### Peptify

[App page](https://appshunter.io/ios/app/peptify-peptide-tracker/id6760272148)

This app provides comprehensive tools for tracking peptide protocols, including advanced pharmacokinetic modeling, bloodwork analysis, and educational resources. It helps users monitor their progress, understand compound interactions, and generate reports for healthcare providers.

**Highlights:** Pharmacokinetic modeling, Bloodwork analysis and import, Research-backed compound library, Professional PDF report generation, Body composition tracking, Educational courses and quizzes, Protocol and injection site management

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Peptify Pro Monthly | $4.99 | per month |
| Peptify Pro Annual | $29.99 | per year |
| Lifetime Access | $89.99 | one-time |


### ThinkLeft

[App page](https://appshunter.io/ios/app/thinkleft/id6761957491)

This app helps you make better decisions by capturing choices, protecting them from rushed moments, and learning which conditions support your best calls. It builds evidence from your own decisions without ads or trackers, offering insights into personal patterns.

**Highlights:** Private decision logging, Decision Plans with deadlines, Outcome rating and analysis, Personal pattern discovery, Readiness check-in, Home Screen widget, Face ID app lock

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $1.99 | per month |
| Pro Yearly | $14.99 | per year |
| Pro Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is Peptify free?

Peptify is free to download, with in-app purchases available.

### Is ThinkLeft free?

ThinkLeft is free to download, with in-app purchases available.

### Which has better reviews, Peptify or ThinkLeft?

ThinkLeft is rated higher. Peptify averages 4.3 out of 5 from 23 ratings, while ThinkLeft averages 5.0 from 1 ratings.

### Do Peptify or ThinkLeft have ads?

Peptify shows ads; ThinkLeft does not.

### Which is updated more often, Peptify or ThinkLeft?

Peptify ships an update every 4 days, and ThinkLeft daily. Most recently, Peptify was updated on October 9, 2026 and ThinkLeft on September 26, 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.*