# CalcRx vs Catch the Sig

The clearest difference is in-app purchases: Catch the Sig at none against CalcRx's 2. Catch the Sig also leads on rating (5.0 vs 4.7). CalcRx's advantage is ratings volume (15 vs 1) and iOS requirement (13.0 vs 18.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. CalcRx sells 2 in-app purchases, starting at $0.99 per month. Catch the Sig asks for nothing beyond the download.

Catch the Sig holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: CalcRx has 15 ratings behind it against 1, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 10 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | CalcRx | Catch the Sig |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (15 ratings)](https://appshunter.io/ios/app/calcrx/id1005970010/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/catch-the-sig/id1092876650/reviews)** |
| Number of ratings | **15** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 months | Every 10 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 29 MB | 2 MB |
| Requires iOS | **13.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Dabbling Badger LLC](https://appshunter.io/developer/455874932) | [David Bourne](https://appshunter.io/developer/1031086386) |

## What reviewers say

### CalcRx

[App page](https://appshunter.io/ios/app/calcrx/id1005970010)

This app helps medical professionals quickly calculate prescription dispense quantities and billable days supply. It handles various dosage forms and complex regimens, saving valuable time for pharmacists, nurses, and prescribers.

**Highlights:** Prescription quantity calculations, Billable days supply determination, Supports various dosage forms, Handles complex regimens, Standard calculator with history, Sig code reference

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Full Access | $0.99 | per month |
| Yearly Full Access | $9.99 | per year |


### Catch the Sig

[App page](https://appshunter.io/ios/app/catch-the-sig/id1092876650)

Practice identifying prescription abbreviations commonly found on medication directions. This game is designed for pharmacy and healthcare students to improve their recognition of these essential terms.

**Highlights:** Identify prescription abbreviations, Practice for healthcare students, Focus on prescription directions (sig), Learn common abbreviations

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CalcRx free?

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

### Is Catch the Sig free?

Catch the Sig is free to download, with no in-app purchases.

### Which has better reviews, CalcRx or Catch the Sig?

Catch the Sig is rated higher. CalcRx averages 4.7 out of 5 from 15 ratings, while Catch the Sig averages 5.0 from 1 ratings.

### Do CalcRx or Catch the Sig have ads?

Neither CalcRx nor Catch the Sig shows ads.

### Which is updated more often, CalcRx or Catch the Sig?

CalcRx ships an update every 10 months, and Catch the Sig every 10 months. Most recently, CalcRx was updated on November 1, 2026 and Catch the Sig on November 2, 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.*