# STI Tx Guide vs SD Getting To Zero

The clearest difference is update cadence: STI Tx Guide at every 2 months against SD Getting To Zero's every 12 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

STI Tx Guide ships an update every 2 months, SD Getting To Zero every 12 months. The most recent releases landed on August 28, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | STI Tx Guide | SD Getting To Zero |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.5 (36 ratings)](https://appshunter.io/ios/app/sti-tx-guide/id655206856/reviews)** | — |
| Number of ratings | **36** | — |
| Positive reviews | 35.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 12 months |
| Monetization | Free | — |
| Size | 36 MB | 21 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 12+ |
| Developer | [Centers For Disease Control and Prevention](https://appshunter.io/developer/439259253) | [County of San Diego](https://appshunter.io/developer/561734090) |

## What reviewers say

### STI Tx Guide

[App page](https://appshunter.io/ios/app/sti-tx-guide/id655206856)

Provides healthcare professionals with up-to-date, evidence-based recommendations for the prevention, diagnosis, and treatment of sexually transmitted infections. Features include clinical care guidance, sexual history resources, and patient materials for effective patient management.

**Highlights:** STI prevention recommendations, Diagnosis guidance, Treatment protocols, Clinical care assistance, Sexual history resources, Patient management tools

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

**In-app purchases:** none


### SD Getting To Zero

[App page](https://appshunter.io/ios/app/sd-getting-to-zero/id6451212977)

**In-app purchases:** none


## Frequently asked questions

### Is STI Tx Guide free?

STI Tx Guide is free to download, with no in-app purchases.

### Is SD Getting To Zero free?

SD Getting To Zero is free to download, with no in-app purchases.

### Do STI Tx Guide or SD Getting To Zero have ads?

Neither STI Tx Guide nor SD Getting To Zero shows ads.

### Which is updated more often, STI Tx Guide or SD Getting To Zero?

STI Tx Guide ships an update every 2 months, and SD Getting To Zero every 12 months. Most recently, STI Tx Guide was updated on August 28, 2026 and SD Getting To Zero on September 9, 2026.

---

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