# EnteraCalc Continuous vs ASPEN ebook

The clearest difference is iOS requirement: ASPEN ebook at 15.6 against EnteraCalc Continuous's 18.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

EnteraCalc Continuous ships an update every 6 months, ASPEN ebook every 3 months. The most recent releases landed on September 8, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | EnteraCalc Continuous | ASPEN ebook |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 months** |
| Size | 2 MB | 112 MB |
| Requires iOS | 18.1 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Peter Weiss](https://appshunter.io/developer/1783425640) | [American Society for Parenteral and Enteral Nutrition (A.S.P.E.N.)](https://appshunter.io/developer/672253901) |

## What reviewers say

### EnteraCalc Continuous

[App page](https://appshunter.io/ios/app/enteracalc-continuous/id6739096956)

**Features:** macOS Compatibility

**In-app purchases:** none


### ASPEN ebook

[App page](https://appshunter.io/ios/app/aspen-ebook/id6748378007)

**In-app purchases:** none


## Frequently asked questions

### Is EnteraCalc Continuous free?

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

### Is ASPEN ebook free?

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

### Do EnteraCalc Continuous or ASPEN ebook have ads?

Neither EnteraCalc Continuous nor ASPEN ebook shows ads.

### Which is updated more often, EnteraCalc Continuous or ASPEN ebook?

EnteraCalc Continuous ships an update every 6 months, and ASPEN ebook every 3 months. Most recently, EnteraCalc Continuous was updated on September 8, 2026 and ASPEN ebook on September 10, 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.*