# The Prime Machine vs Roll Call

The clearest difference is in-app purchases: The Prime Machine at none against Roll Call's 3. The Prime Machine also leads on device support (4 vs 2) and iOS requirement (11.0 vs 17). Roll Call's advantage is update cadence (weekly vs every 3 weeks). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Roll Call sells 3 in-app purchases, starting at $0.99 per month. The Prime Machine asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for The Prime Machine against 5.0 for Roll Call. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

The Prime Machine ships an update every 3 weeks, Roll Call weekly. The most recent releases landed on October 20, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | The Prime Machine | Roll Call |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/the-prime-machine/id1557062170/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/roll-call-raffle-name-picker/id6800192949/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | **Free** | Freemium |
| Size | 67 MB | 11 MB |
| Requires iOS | **11.0** | 17 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Stephen Jeaco](https://appshunter.io/developer/1484919180) | [大容 吴](https://appshunter.io/developer/6778630537) |

## What reviewers say

### The Prime Machine

[App page](https://appshunter.io/ios/app/the-prime-machine/id1557062170)

Analyze text documents and pre-made English language corpora. Explore word frequencies, collocations, and concordance lines. Create and analyze your own custom text collections.

**Highlights:** Analyze readymade English corpora, Analyze DIY corpora from text/PDF, View concordance lines (lines or cards), Access frequency data, Explore collocations, Full Mode research tools

**In-app purchases:** none


### Roll Call

[App page](https://appshunter.io/ios/app/roll-call-raffle-name-picker/id6800192949)

This app helps educators and group leaders fairly select names, track attendance, and create balanced teams. It offers features for random selection, attendance marking with notes, and dynamic team generation. It works offline and is designed for various group settings.

**Highlights:** Random name and number selection, Attendance tracking with custom statuses, Automatic team and group generation, Roster import and creation, Offline functionality, Customizable home screen

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly Full Unlock | $0.99 | per month |
| Pro Yearly Full Unlock | $6.99 | per year |
| Pro Lifetime Full Unlock | $12.99 | one-time |


## Frequently asked questions

### Is The Prime Machine free?

The Prime Machine is free to download, with no in-app purchases.

### Is Roll Call free?

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

### Which has better reviews, The Prime Machine or Roll Call?

The Prime Machine and Roll Call are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do The Prime Machine or Roll Call have ads?

Neither The Prime Machine nor Roll Call shows ads.

### Which is updated more often, The Prime Machine or Roll Call?

The Prime Machine ships an update every 3 weeks, and Roll Call weekly. Most recently, The Prime Machine was updated on October 20, 2026 and Roll Call on October 29, 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.*