# SLII® vs Merck Buddy

The clearest difference is iOS requirement: SLII® at 12.4 against Merck Buddy's 16.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 10, 2026 and May 17, 2026 respectively.

## The numbers

| Metric | SLII® | Merck Buddy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (28 ratings)](https://appshunter.io/ios/app/slii/id536473591/reviews)** | — |
| Number of ratings | **28** | — |
| Positive reviews | 58.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | — |
| Size | 47 MB | 62 MB |
| Requires iOS | **12.4** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [The Ken Blanchard Companies](https://appshunter.io/developer/417829677) | [Neet Technologies LLP](https://appshunter.io/developer/923006116) |

## What reviewers say

### SLII®

[App page](https://appshunter.io/ios/app/slii/id536473591)

This reference tool helps leaders and team members apply the SLII Model to improve relationships and performance. It provides guidance for critical leadership moments, offering diagnostic tools and actionable tips.

**Highlights:** Diagnosis wizard for development levels, Actionable tips for SLII principles, Interactive SLII Model visualization, On-demand expanded information, Guidance for leadership conversations

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

**In-app purchases:** none


### Merck Buddy

[App page](https://appshunter.io/ios/app/merck-buddy/id1469381405)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SLII® free?

SLII® is free to download, with no in-app purchases.

### Is Merck Buddy free?

Merck Buddy is free to download, with no in-app purchases.

### Do SLII® or Merck Buddy have ads?

Neither SLII® nor Merck Buddy shows ads.

### Which is updated more often, SLII® or Merck Buddy?

SLII® ships an update every 3 weeks, and Merck Buddy every 3 weeks. Most recently, SLII® was updated on September 10, 2026 and Merck Buddy on May 17, 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.*