# Electronic Invoice Crypto vs Duty shift

The clearest difference is update cadence: Duty shift at every 9 days against Electronic Invoice Crypto's every 3 months. Duty shift also leads on iOS requirement (17.6 vs 26.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Electronic Invoice Crypto sells 3 one-off in-app purchases and Duty shift sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Electronic Invoice Crypto ships an update every 3 months, Duty shift every 9 days. The most recent releases landed on September 10, 2026 and June 30, 2026 respectively.

## The numbers

| Metric | Electronic Invoice Crypto | Duty shift |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/duty-shift/id6755762933/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | — | Freemium |
| Size | 2 MB | 9 MB |
| Requires iOS | 26.2 | **17.6** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Juan Fullana](https://appshunter.io/developer/692107580) | [Mateusz Moc](https://appshunter.io/developer/1856182326) |

## What reviewers say

### Electronic Invoice Crypto

[App page](https://appshunter.io/ios/app/electronic-invoice-crypto/id1387161551)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 25 Electronic Invoices | $1.99 | one-time |
| 250 Electronic Invoices | $3.99 | one-time |
| Electronic Invoices: No Limits | $8.99 | one-time |


### Duty shift

[App page](https://appshunter.io/ios/app/duty-shift/id6755762933)

Manage your maritime crew's watch schedules and logbook with this assistant app. It automates rotations, tracks GPS positions, and sends timely notifications for watch changes. Personalize crew profiles and export professional documents in the Pro version.

**Highlights:** Smart schedule generation (Fixed or Fair Rotation), Automatic GPS logbook with route history, Watch change notifications, Personalized "That's Me" timer, Crew list with emoji avatars, PDF export of crew lists and agendas (Pro), Voyage file sharing (Pro)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Version | $3.99 | one-time |


## Frequently asked questions

### Is Electronic Invoice Crypto free?

Electronic Invoice Crypto is free to download, with in-app purchases available.

### Is Duty shift free?

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

### Do Electronic Invoice Crypto or Duty shift have ads?

Neither Electronic Invoice Crypto nor Duty shift shows ads.

### Which is updated more often, Electronic Invoice Crypto or Duty shift?

Electronic Invoice Crypto ships an update every 3 months, and Duty shift every 9 days. Most recently, Electronic Invoice Crypto was updated on September 10, 2026 and Duty shift on June 30, 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.*