# RezClock vs AHA ACLS

The clearest difference is rating: AHA ACLS at 4.9 against RezClock's 2.3. AHA ACLS also leads on update cadence (every 2 months vs every 35 months) and review sentiment (26% vs 0%). RezClock's advantage is iOS requirement (10.0 vs 15.1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. RezClock sells 1 in-app purchase, starting at $0.99 per month and AHA ACLS sells 1 in-app purchase, starting at $3.99 per year. Whichever you choose, the download price is not the number that matters.

AHA ACLS holds the better App Store score, 4.9 against 2.3. That said, the two scores are not equally well evidenced: AHA ACLS has 277 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 0% of RezClock's written reviews are positive against 26% of AHA ACLS's.

RezClock ships an update every 35 months, AHA ACLS every 2 months. The most recent releases landed on June 11, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | RezClock | AHA ACLS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/rezclock/id988755622/reviews) | **[4.9 (277 ratings)](https://appshunter.io/ios/app/aha-acls/id1506944443/reviews)** |
| Number of ratings | 3 | **277** |
| Positive reviews | 0.0% of reviews | **26.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 35 months | **Every 2 months** |
| Monetization | Subscription | Subscription |
| Best chart rank | — | **#62** |
| Size | 24 MB | 48 MB |
| Requires iOS | **10.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Mitra U.S. Computer Solutions, Inc](https://appshunter.io/developer/988434177) | [Massachusetts General Hospital](https://appshunter.io/developer/376928206) |

## What reviewers say

### RezClock

[App page](https://appshunter.io/ios/app/rezclock/id988755622)

Automates medical resident duty hour tracking using location services to log arrival and departure times at clinical sites. Hours can be uploaded to other systems for generating ACGME required reports. Offers a free trial period before subscription.

**Highlights:** Automated time tracking, Location-based geofencing, Duty hours reporting, Data upload to MedProSuite, Free trial period

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RezClock Monthly - $0.99/month | $0.99 | per month |


### AHA ACLS

[App page](https://appshunter.io/ios/app/aha-acls/id1506944443)

**Currently charting:** #62 Top Grossing · Medical (US App Store)

This app provides clinicians with a digital tool to assist in running cardiac arrest codes and delivering advanced cardiac life support (ACLS) at the bedside. It features the latest AHA recommendations and includes intuitive access to algorithms, drug dosing, and timers for efficient patient care.

**Highlights:** 4 ACLS algorithms (cardiac arrest, tachycardia, bradycardia, post-arrest), Latest 2025 AHA ACLS content, Drug therapy and dosing, Easy-to-read timers, CPR and epinephrine logging, Rapid transition to post-arrest care

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ACLS Pro | $3.99 | per year |

**What reviewers like**

- ✅ Accurate, up-to-date AHA ACLS algorithms
- ⏱️ Built-in timers and counters for code management
- 👍 User-friendly, intuitive interface
- 🏥 Trusted by Harvard/MGH and American Heart Association
- 📋 Helpful for documentation and PCR completion

**What reviewers complain about**

- 💰 Subscription paywall on previously free app
- 🚨 Dangerous surprise paywall during active codes
- ⚠️ No warning before transition to paid model
- 🔐 Requires payment even for basic ACLS information
- 😤 Perceived greed from wealthy organizations (MGH/AHA)

**Reported bugs**

- App fails to load information despite subscription payment
- Users locked out of app mid-code
- Unexpected app crashes during critical moments

**Requested features**

- Multiple log storage with dates
- More detailed code logging with event documentation (IO access, medications, rhythms)
- End code button and pause compressions feature
- Real-time log tracking for back-charting
- LVAD algorithm inclusion


## Frequently asked questions

### Is RezClock free?

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

### Is AHA ACLS free?

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

### Which has better reviews, RezClock or AHA ACLS?

AHA ACLS is rated higher. RezClock averages 2.3 out of 5 from 3 ratings, while AHA ACLS averages 4.9 from 277 ratings.

### Do RezClock or AHA ACLS have ads?

Neither RezClock nor AHA ACLS shows ads.

### Which is updated more often, RezClock or AHA ACLS?

RezClock ships an update every 35 months, and AHA ACLS every 2 months. Most recently, RezClock was updated on June 11, 2026 and AHA ACLS on September 24, 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.*