# LSD Scuba vs Efficacy Audit

The clearest difference is ads: Efficacy Audit at none against LSD Scuba's shown. Efficacy Audit also leads on update cadence (every 4 weeks vs every 15 months) and iOS requirement (9.3 vs 11.0). On price, 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.

LSD Scuba ships an update every 15 months, Efficacy Audit every 4 weeks. The most recent releases landed on October 3, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | LSD Scuba | Efficacy Audit |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 15 months | **Every 4 weeks** |
| Monetization | Ad-supported | — |
| Size | 22 MB | 35 MB |
| Requires iOS | 11.0 | **9.3** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [London School of diving](https://appshunter.io/developer/561889154) | [Synbiotix Ltd](https://appshunter.io/developer/978319328) |

## What reviewers say

### LSD Scuba

[App page](https://appshunter.io/ios/app/lsd-scuba/id561889151)

This app offers consultancy services for establishing and operating scuba diving schools. It provides advice on PADI affiliation, IT systems, dive professional training, new dive site identification, marketing, and setting up scuba clubs.

**Highlights:** Scuba diving school establishment advice, PADI affiliation guidance, IT systems consultancy, Dive professional training, New dive site identification, Marketing consultancy, Scuba club setup advice

**In-app purchases:** none


### Efficacy Audit

[App page](https://appshunter.io/ios/app/efficacy-audit/id1600275715)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is LSD Scuba free?

LSD Scuba is free to download, with no in-app purchases.

### Is Efficacy Audit free?

Efficacy Audit is free to download, with no in-app purchases.

### Do LSD Scuba or Efficacy Audit have ads?

LSD Scuba shows ads; Efficacy Audit does not.

### Which is updated more often, LSD Scuba or Efficacy Audit?

LSD Scuba ships an update every 15 months, and Efficacy Audit every 4 weeks. Most recently, LSD Scuba was updated on October 3, 2026 and Efficacy Audit on October 6, 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.*