# AnSo vs Opioid Conversion Calculator

The clearest difference is monetization model: Opioid Conversion Calculator at free with in-app purchases against AnSo's subscription. Opioid Conversion Calculator also leads on rating (3.7 vs 3.5). AnSo's advantage is update cadence (fortnightly vs every 2 months) and chart position (#83 vs unranked). On price, review sentiment, ratings volume and ads there is nothing between them.

Both are free to download. AnSo sells 4 in-app purchases, starting at $0.49 per month and Opioid Conversion Calculator sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Opioid Conversion Calculator holds the better App Store score, 3.7 against 3.5. Both are backed by a comparable volume of ratings — 30 and 17 respectively. Written reviews complicate that: 39% of AnSo's written reviews are positive against 38% of Opioid Conversion Calculator's, so the app with the better star average is not the one people write more warmly about.

AnSo ships an update fortnightly, Opioid Conversion Calculator every 2 months. The most recent releases landed on September 23, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | AnSo | Opioid Conversion Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (30 ratings)](https://appshunter.io/ios/app/anso/id1627451047/reviews) | **[3.7 (17 ratings)](https://appshunter.io/ios/app/opioid-conversion-calculator/id6446010375/reviews)** |
| Number of ratings | **30** | 17 |
| Positive reviews | **39.1% of reviews** | 37.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Subscription | **Free with in-app purchases** |
| Best chart rank | **#83** | — |
| Size | 72 MB | 88 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Sumo Enterprises Pty Ltd](https://appshunter.io/developer/1202779263) | [Ayrial Beall](https://appshunter.io/developer/1735693360) |

## What reviewers say

### AnSo

[App page](https://appshunter.io/ios/app/anso/id1627451047)

**Currently charting:** #83 Top Grossing · Medical (US App Store)

This app helps anesthesiologists quickly identify sonoanatomy for various procedures. It offers detailed images, landmark sketches, and innervation data for nerve blocks, along with tips from experienced clinicians. It covers regional anesthesia and other perioperative ultrasound uses.

**Highlights:** Sonoanatomy identification, Landmark sketches, Nerve block innervation, Ergonomic positioning guides, Perioperative ultrasound uses, Clinical tips and notes

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AnSo one month subscription | $0.49 | per month |
| AnSo Pro one year subscription | $5.99 | per year |
| AnSo Pro subscription | $5.99 | per year |
| AnSo one year subscription | $5.99 | per year |


### Opioid Conversion Calculator

[App page](https://appshunter.io/ios/app/opioid-conversion-calculator/id6446010375)

This medical app simplifies complex opioid conversion tasks for healthcare professionals. It offers extensive drug coverage, a visual safety indicator for dosages, and breakthrough dosing calculations. Available in multiple languages, it ensures accurate and safe pain management.

**Highlights:** Extensive drug coverage, Visual safety indicator, Breakthrough dosing calculations, Formulation conversions, Up-to-date pharmaceutical formulary, Multilingual support

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro Access | $3.99 | per month |
| Pro Access | $19.99 | per year |
| Lifetime Pro Access | $79.99 | one-time |


## Frequently asked questions

### Is AnSo free?

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

### Is Opioid Conversion Calculator free?

Opioid Conversion Calculator is free to download, with in-app purchases available.

### Which has better reviews, AnSo or Opioid Conversion Calculator?

Opioid Conversion Calculator is rated higher. AnSo averages 3.5 out of 5 from 30 ratings, while Opioid Conversion Calculator averages 3.7 from 17 ratings.

### Do AnSo or Opioid Conversion Calculator have ads?

Neither AnSo nor Opioid Conversion Calculator shows ads.

### Which is updated more often, AnSo or Opioid Conversion Calculator?

AnSo ships an update fortnightly, and Opioid Conversion Calculator every 2 months. Most recently, AnSo was updated on September 23, 2026 and Opioid Conversion Calculator on September 22, 2026.

---

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