# Vetcalculators vs DFsources

The clearest difference is in-app purchases: DFsources at none against Vetcalculators's 1. Vetcalculators's advantage is update cadence (every 3 months vs every 7 months) and chart position (#59 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. DFsources asks for nothing beyond the download.

Vetcalculators ships an update every 3 months, DFsources every 7 months. The most recent releases landed on October 1, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Vetcalculators | DFsources |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (606 ratings)](https://appshunter.io/ios/app/vetcalculators/id1403466061/reviews)** | — |
| Number of ratings | **606** | — |
| Positive reviews | 45.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 7 months |
| Monetization | Subscription | — |
| Best chart rank | **#59** | — |
| Size | 85 MB | 55 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [LifeLearn USA](https://appshunter.io/developer/1642768183) | [datafax](https://appshunter.io/developer/1353928449) |

## What reviewers say

### Vetcalculators

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

**Currently charting:** #59 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


### DFsources

[App page](https://appshunter.io/ios/app/dfsources/id1539742321)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Vetcalculators free?

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

### Is DFsources free?

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

### Do Vetcalculators or DFsources have ads?

Neither Vetcalculators nor DFsources shows ads.

### Which is updated more often, Vetcalculators or DFsources?

Vetcalculators ships an update every 3 months, and DFsources every 7 months. Most recently, Vetcalculators was updated on October 1, 2026 and DFsources on September 14, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*