# Vetcalculators vs OneUnit+ Pets

The clearest difference is in-app purchases: OneUnit+ Pets at none against Vetcalculators's 1. OneUnit+ Pets also leads on update cadence (weekly vs every 2 months). Vetcalculators's advantage is chart position (#61 vs unranked). On price, ads, device support and iOS requirement there is nothing between them.

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

Vetcalculators ships an update every 2 months, OneUnit+ Pets weekly. The most recent releases landed on October 19, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Vetcalculators | OneUnit+ Pets |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (615 ratings)](https://appshunter.io/ios/app/vetcalculators/id1403466061/reviews)** | — |
| Number of ratings | **615** | — |
| Positive reviews | 43.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Subscription | — |
| Best chart rank | **#61** | — |
| Size | 83 MB | 51 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [LifeLearn USA](https://appshunter.io/developer/1642768183) | [National Veterinary Associates Inc.](https://appshunter.io/developer/1240543009) |

## What reviewers say

### Vetcalculators

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

**Currently charting:** #61 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


### OneUnit+ Pets

[App page](https://appshunter.io/ios/app/oneunit-plus-pets/id6769776681)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Vetcalculators free?

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

### Is OneUnit+ Pets free?

OneUnit+ Pets is free to download, with no in-app purchases.

### Do Vetcalculators or OneUnit+ Pets have ads?

Neither Vetcalculators nor OneUnit+ Pets shows ads.

### Which is updated more often, Vetcalculators or OneUnit+ Pets?

Vetcalculators ships an update every 2 months, and OneUnit+ Pets weekly. Most recently, Vetcalculators was updated on October 19, 2026 and OneUnit+ Pets 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.*