# IV drip calculation vs EMS Field

The clearest difference is update cadence: EMS Field at every 5 days against IV drip calculation's monthly. EMS Field also leads on iOS requirement (16.4 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. IV drip calculation sells 1 one-off in-app purchase and EMS Field sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

IV drip calculation ships an update monthly, EMS Field every 5 days. The most recent releases landed on October 30, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | IV drip calculation | EMS Field |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 8 MB | 37 MB |
| Requires iOS | 26.0 | **16.4** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [BLUE COMET LABS LLC](https://appshunter.io/developer/1492055170) | [Hatsumi Takahashi](https://appshunter.io/developer/6776581577) |

## What reviewers say

### IV drip calculation

[App page](https://appshunter.io/ios/app/iv-drip-calculation-ondrip/id6483362139)

This app simplifies IV drip rate calculation and adjustment using intuitive vibration feedback. It allows saving common settings and synchronizing them between iPhone and Apple Watch, aiding healthcare professionals in providing efficient patient care.

**Highlights:** Calculate drip rate, Vibration-based drip adjustment, Save infusion settings, Sync between iPhone and Apple Watch, Intuitive UI

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OnDrip Pro - Lifetime | $2.99 | one-time |


### EMS Field

[App page](https://appshunter.io/ios/app/ems-field/id6784478787)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 全文アクセス | $0.99 | one-time |


## Frequently asked questions

### Is IV drip calculation free?

IV drip calculation is free to download, with in-app purchases available.

### Is EMS Field free?

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

### Do IV drip calculation or EMS Field have ads?

Neither IV drip calculation nor EMS Field shows ads.

### Which is updated more often, IV drip calculation or EMS Field?

IV drip calculation ships an update monthly, and EMS Field every 5 days. Most recently, IV drip calculation was updated on October 30, 2026 and EMS Field on November 1, 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.*