Comparison

Prime vs Research Notes

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Prime

Access up-to-date journal citations and abstracts from the complete PubMed database. Perform powerful searches, link to full-text articles, and utilize exclusive tools for visual exploration of research relationships and personalized discovery.

Highlights
  • PubMed database access
  • Keyword, author, journal search
  • Link to full-text articles
  • Bookmark and tag articles
  • Share articles via multiple platforms
  • Grapherence visual search
  • Personalized article feed
Features
Read full description

The free Prime app connects you to the most up-to-date journal citations and abstracts from the complete PubMed database. In addition to the ability to perform powerful searches and link to the publisher’s full text articles, Prime also provides a number of exclusive tools not available anywhere else creating a one-of-a-kind user experience. PRIME FEATURES - Search: Perform evidence-based searches by keyword, author, or journal then link to full text articles. - Organize: Bookmark and Tag important articles and searches to quickly return to them later - Share: Share articles directly from the app via Email, Twitter, Facebook, SMS, Dropbox, and more EXCLUSIVE TOOLS - Grapherence®: Unbound’s unique search option allows you to visually explore the influence and interrelationships among journal articles - For You: Discover new articles in a feed designed specifically for you based on how you use the app - Browse: Select specific journals you want to follow and receive alerts when new articles are published WHAT IS GRAPHERENCE? Grapherence® is Unbound’s interactive search that graphically represents the influence and interrelationships among journal articles. Tap the Grapherence button within a citation and instantly see how that article is related to others. Using this exclusive feature the researcher quickly uncovers difficult to find entries, determines overall significance, identifies clusters of thought, and locates seminal articles. ABOUT UNBOUND MEDICINE With 50+ premium apps available, Unbound Medicine combines powerful software with best-selling content to deliver clinical answers wherever you need them. Top-selling apps include Johns Hopkins Antibiotic (ABX) Guide, Davis’s Drug Guide, 5-Minute Clinical Consult, Harriet Lane Handbook, The Washington Manual, Nursing Central™, and Diagnosaurus DDx.

About

Research Notes

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
Read full description

Research Notes brings the latest articles from the journals you follow into one clean reading list. FOLLOW JOURNALS • Choose from nearly 700 journals across 29 fields, from cardiology and oncology to genomics and public health • Start with the must-reads, or follow a whole field in a tap • Find any journal by name or publisher TODAY • The latest articles, newest first and grouped by day, each with a short summary • Switch to By journal for a table of contents, one journal at a time • A dot marks what you haven't seen yet, and each journal shows its count for the week • Search everything you follow READ • Read the summary, then the full article on the publisher's site, without leaving the app • Share an article in a tap SAVED • Save the articles you want to come back to • Your journals and saved articles stay on your device, with no account to create MADE FOR iPHONE AND iPAD • On iPad, your journals sit in a sidebar and the article opens beside your list • Clear, large type in light or dark mode Free, with ads.

Screenshots

Prime4 screens
Research Notes4 screens

Verdict

The call

The clearest difference is rating: Prime at 4.8 against Research Notes's 4.0. Prime also leads on in-app purchases (none vs 3) and ads (none vs shown). Research Notes's advantage is update cadence (weekly vs every 4 months). On price and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

Prime holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Prime has 694 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 84% of Prime's written reviews are positive against 71% of Research Notes's.

UpkeepUpdate frequency

Prime ships an update every 4 months, Research Notes weekly. Both last shipped on October 27, 2026.

Scorecard8 real differences · 2 level
Prime versus Research Notes: the parameters behind the verdict, then further details
ParameterPrimeResearch Notes
PriceFreeFree
Rating4.8 (694 ratings) — better4.0 (4 ratings)
Positive reviews83.8% of reviews — better71.4% of reviews
Number of ratings694 — better4
Update frequencyEvery 4 monthsWeekly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size9 MB6 MB
Age rating17++4
DeveloperUnbound Medicine, Inc.Omelette, Inc

Customer experience

Prime

All ratings693 ratings
Positive96.0%
Neutral1.6%
Negative2.5%
Written reviews160 reviews
Positive83.8%
Neutral5.0%
Negative11.3%

Research Notes

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews7 reviews
Positive71.4%
Neutral14.3%
Negative14.3%

Bugs and requests

Prime

Reported bugs

3 issues
  • Abstracts cut off and unable to scroll
  • Crashes on certain devices (iPad 3, iOS 8.4)
  • Duplicate papers appearing in reading lists

Requested features

5 requests
  • Ability to open PDFs in external apps
  • Option to delete irrelevant items from saved lists
  • Faster article loading times
  • Integration with Dropbox or other cloud storage
  • Advanced search functionality (e.g., author + abstract)

Research Notes

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Prime

No in-app purchases

3 purchases

Research Notes

Subscriptions2
  • PDF to Audio for 6 months$7.496 Months
  • PDF to Audio for 12 Months$11.991 Year
One-time1
  • Research Notes$4.99

Questions

Is Prime free?
Prime is free to download, with no in-app purchases.
Is Research Notes free?
Research Notes is free to download, with in-app purchases available.
Which has better reviews, Prime or Research Notes?
Prime is rated higher. Prime averages 4.8 out of 5 from 694 ratings, while Research Notes averages 4.0 from 4 ratings.
Do Prime or Research Notes have ads?
Research Notes shows ads; Prime does not.
Which is updated more often, Prime or Research Notes?
Prime ships an update every 4 months, and Research Notes weekly. Most recently, Prime was updated on October 27, 2026 and Research Notes on October 27, 2026.

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