# Primum vs HemOncBytes

The clearest difference is rating: HemOncBytes at 5.0 against Primum's 4.2. HemOncBytes also leads on ads (none vs shown). Primum's advantage is in-app purchases (none vs 1). On price, review sentiment, ratings volume and update cadence there is nothing between them.

Both are free to download. HemOncBytes sells 1 one-off in-app purchase. Primum asks for nothing beyond the download.

HemOncBytes holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 5 and 7 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 2, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Primum | HemOncBytes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (5 ratings)](https://appshunter.io/ios/app/primum/id6651755259/reviews) | **[5.0 (7 ratings)](https://appshunter.io/ios/app/hemoncbytes/id6749437597/reviews)** |
| Number of ratings | 5 | **7** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 53 MB | 111 MB |
| Requires iOS | **15.1** | 15.2 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [PRIMUM HEALTH, INC.](https://appshunter.io/developer/1707581637) | [VitalFolio LLC](https://appshunter.io/developer/1830427949) |

## What reviewers say

### Primum

[App page](https://appshunter.io/ios/app/primum/id6651755259)

Connect with expert oncologists for case-specific advice and treatment decision support. This app facilitates direct messaging with specialists, offering actionable insights and a platform to manage your inquiries efficiently.

**Highlights:** Search and filter expert oncologists, Direct messaging with specialists, Real-time chat and notifications, Case-specific advice, Inbox management, Reference past inquiries

**Features:** macOS Compatibility

**In-app purchases:** none


### HemOncBytes

[App page](https://appshunter.io/ios/app/hemoncbytes/id6749437597)

Stay current with hematology and oncology information through concise, actionable updates. This app uses a microlearning and active recall method to boost clinical confidence and decision-making speed. Content is clinically relevant and vetted by practicing oncologists.

**Highlights:** Quick, actionable bytes of information, Microlearning and active recall, Clinically relevant content, Vetted by practicing oncologists, Boosts clinical confidence, Practice-changing updates

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Best of ASCO 2025 | $100.00 | one-time |


## Frequently asked questions

### Is Primum free?

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

### Is HemOncBytes free?

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

### Which has better reviews, Primum or HemOncBytes?

HemOncBytes is rated higher. Primum averages 4.2 out of 5 from 5 ratings, while HemOncBytes averages 5.0 from 7 ratings.

### Do Primum or HemOncBytes have ads?

Primum shows ads; HemOncBytes does not.

### Which is updated more often, Primum or HemOncBytes?

Primum ships an update every 2 months, and HemOncBytes every 2 months. Most recently, Primum was updated on October 2, 2026 and HemOncBytes on October 7, 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.*