# StackProof vs OnePin

StackProof and OnePin are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. StackProof sells 3 in-app purchases, starting at $1.99 per month and OnePin sells 1 in-app purchase, starting at $49.99 per year. Whichever you choose, the download price is not the number that matters.

StackProof ships an update weekly, OnePin every 5 days. The most recent releases landed on September 15, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | StackProof | OnePin |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (6 ratings)](https://appshunter.io/ios/app/onepin-trt-and-peptide-tracker/id6767091719/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 5 days** |
| Monetization | — | Freemium |
| Size | 42 MB | 83 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [joel Saucedo Lozano](https://appshunter.io/developer/1895885764) | [James Lee](https://appshunter.io/developer/1893536737) |

## What reviewers say

### StackProof

[App page](https://appshunter.io/ios/app/stackproof-supplement-tracker/id6764703324)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Yearly | $34.99 | per year |
| Lifetime | $59.99 | one-time |


### OnePin

[App page](https://appshunter.io/ios/app/onepin-trt-and-peptide-tracker/id6767091719)

This app helps users meticulously track complex peptide and supplement protocols. It offers smart syringe grouping, phase-aware dose calculations, vial life management, and inventory tracking. Features include a body map injection site tracker and protocol templates for research peptide users and biohackers.

**Highlights:** Complex protocol tracking, Smart syringe grouping, Phase-aware dose calculations, Vial life and supply forecasting, Inventory management, Body map injection site tracker, Protocol templates

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OnePin Premium (Annual) | $49.99 | per year |


## Frequently asked questions

### Is StackProof free?

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

### Is OnePin free?

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

### Do StackProof or OnePin have ads?

Neither StackProof nor OnePin shows ads.

### Which is updated more often, StackProof or OnePin?

StackProof ships an update weekly, and OnePin every 5 days. Most recently, StackProof was updated on September 15, 2026 and OnePin on September 18, 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.*