# Opioids Dosage Conversion vs Vetcalculators

The clearest difference is in-app purchases: Opioids Dosage Conversion at none against Vetcalculators's 1. Opioids Dosage Conversion also leads on review sentiment (78% vs 45%). Vetcalculators's advantage is rating (4.7 vs 4.3) and ratings volume (606 vs 18). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Vetcalculators sells 1 in-app purchase, starting at $3.99 per month. Opioids Dosage Conversion asks for nothing beyond the download.

Vetcalculators holds the better App Store score, 4.7 against 4.3. That said, the two scores are not equally well evidenced: Vetcalculators has 606 ratings behind it against 18, so its average is the more settled of the two. Written reviews complicate that: 78% of Opioids Dosage Conversion's written reviews are positive against 45% of Vetcalculators's, so the app with the better star average is not the one people write more warmly about.

Opioids Dosage Conversion ships an update every 4 months, Vetcalculators every 3 months. The most recent releases landed on September 17, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Opioids Dosage Conversion | Vetcalculators |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (18 ratings)](https://appshunter.io/ios/app/opioids-dosage-conversion/id382383903/reviews) | **[4.7 (606 ratings)](https://appshunter.io/ios/app/vetcalculators/id1403466061/reviews)** |
| Number of ratings | 18 | **606** |
| Positive reviews | **77.8% of reviews** | 45.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | **Free** | Subscription |
| Best chart rank | — | **#44** |
| Size | 2 MB | 85 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Chris Marcellino MD LLC](https://appshunter.io/developer/1161719220) | [LifeLearn USA](https://appshunter.io/developer/1642768183) |

## What reviewers say

### Opioids Dosage Conversion

[App page](https://appshunter.io/ios/app/opioids-dosage-conversion/id382383903)

This app is a calculator for trained medical professionals to convert opioid analgesic dosages. It supports various common opioids and administration routes, offering features like breakthrough dosing and cross-tolerance calculations.

**Highlights:** Opioid dosage conversion, Multiple drug support, Multiple route support, Breakthrough dosing calculator, Incomplete cross tolerance option, Instructional details

**Features:** macOS Compatibility

**In-app purchases:** none


### Vetcalculators

[App page](https://appshunter.io/ios/app/vetcalculators/id1403466061)

**Currently charting:** #44 Top Grossing · Medical (US App Store)

This app provides veterinarians and staff with a comprehensive suite of calculators for drug dosages, medical measurements, and patient assessments. It also includes a wide range of veterinary references for quick access to essential information.

**Highlights:** Drug dose calculators, Emergency drug dosages, Fluid therapy rates, Toxicity calculators, Pet age calculator, Veterinary references, Unit conversion

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Vetcalculators Subscription | $3.99 | per month |

**What reviewers like**

- 🚀 Saves significant time on drug calculations
- ✅ Accurate dosage calculations reduce errors
- 📚 Comprehensive reference library with multiple resources
- 💊 Useful for emergency cases and anesthesia management
- 🔧 Highly customizable with favorites and personal dosages

**What reviewers complain about**

- 💰 Switched from one-time purchase to monthly subscription
- 🔐 No grandfathering for previous paid users
- 🐛 App frequently freezes or crashes on opening
- 🐛 Unresponsive UI elements that require repeated tapping
- 🌐 Requires internet connection to function

**Reported bugs**

- App crashes or closes immediately upon opening
- UI elements unresponsive to clicks and taps
- Drug database fails to load after updates
- Data not persisting when app order is changed
- New drugs and concentrations not saving properly

**Requested features**

- Support for additional animal species beyond dogs and cats
- Gram weight unit option in addition to lbs and kgs
- Cross-device data synchronization
- Offline functionality without internet requirement
- Student pricing or free tier option


## Frequently asked questions

### Is Opioids Dosage Conversion free?

Opioids Dosage Conversion is free to download, with no in-app purchases.

### Is Vetcalculators free?

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

### Which has better reviews, Opioids Dosage Conversion or Vetcalculators?

Vetcalculators is rated higher. Opioids Dosage Conversion averages 4.3 out of 5 from 18 ratings, while Vetcalculators averages 4.7 from 606 ratings.

### Do Opioids Dosage Conversion or Vetcalculators have ads?

Neither Opioids Dosage Conversion nor Vetcalculators shows ads.

### Which is updated more often, Opioids Dosage Conversion or Vetcalculators?

Opioids Dosage Conversion ships an update every 4 months, and Vetcalculators every 3 months. Most recently, Opioids Dosage Conversion was updated on September 17, 2026 and Vetcalculators on September 22, 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.*