# QPS Assay Finder vs Research Notes

The clearest difference is in-app purchases: QPS Assay Finder at none against Research Notes's 3. QPS Assay Finder also leads on ads (none vs shown) and iOS requirement (13.0 vs 17.0). Research Notes's advantage is update cadence (weekly vs every 41 months). On price and device support there is nothing between them.

Both are free to download. Research Notes sells 3 in-app purchases, starting at $7.49 per 6 months. QPS Assay Finder asks for nothing beyond the download.

QPS Assay Finder ships an update every 41 months, Research Notes weekly. The most recent releases landed on October 10, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | QPS Assay Finder | Research Notes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (4 ratings)](https://appshunter.io/ios/app/research-notes/id1472037622/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 71.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 41 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 3 MB | 6 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [QPS, LLC](https://appshunter.io/developer/665640156) | [Omelette, Inc](https://appshunter.io/developer/984352813) |

## What reviewers say

### QPS Assay Finder

[App page](https://appshunter.io/ios/app/qps-assay-finder/id665640153)

**Features:** macOS Compatibility

**In-app purchases:** none


### Research Notes

[App page](https://appshunter.io/ios/app/research-notes/id1472037622)

Access RSS feeds from hundreds of scientific journals across various subject categories. Download PDFs and utilize a text-to-speech feature for articles. Organize your favorite journals and discover new ones.

**Highlights:** Hundreds of journal RSS feeds, Subject category filtering, PDF download functionality, Text-to-speech for articles, Favorite journals section, New journal additions

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF to Audio for 6 months | $7.49 | per 6 months |
| PDF to Audio for 12 Months | $11.99 | per year |
| Research Notes | $4.99 | one-time |


## Frequently asked questions

### Is QPS Assay Finder free?

QPS Assay Finder is free to download, with no in-app purchases.

### Is Research Notes free?

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

### Do QPS Assay Finder or Research Notes have ads?

Research Notes shows ads; QPS Assay Finder does not.

### Which is updated more often, QPS Assay Finder or Research Notes?

QPS Assay Finder ships an update every 41 months, and Research Notes weekly. Most recently, QPS Assay Finder was updated on October 10, 2026 and Research Notes on October 20, 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.*