Comparison

CDC Yellow Book vs ABOHNS

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

Head to head
About

CDC Yellow Book

Access the U.S. government's most current travel health guidelines, including vaccine recommendations and destination-specific advice. This app offers comprehensive information for staying healthy abroad, with features like search, notes, and favorites.

Highlights
  • Pre-travel vaccinations and preventative care
  • Destination-specific guidelines
  • Advice for travelers with specific health needs
  • Full text search
  • Custom notes and highlights
  • Reference maps, tables, and charts
Features
Read full description

**U.S. Government’s Most Current and Trusted Travel Health Guidelines** Preview, Buy, or Sign In using this app. FREE PREVIEW – Experience the Yellow Book to see the value of having trusted travel information when and where it's needed. ABOUT YELLOW BOOK The fully revised and updated 2020 CDC Yellow Book app delivers the U.S. government’s most current travel health guidelines, including pre-travel vaccine recommendations, destination-specific health advice, and easy-to-reference maps, tables, and charts. Authored by a team of the world’s most esteemed travel medicine experts, this app best codifies the U.S. Government’s latest travel guidelines to staying healthy anywhere in the world. Review dedicated topics on emerging infectious disease threats such as Zika, Ebola, and MERS, new cholera vaccine recommendations, updated guidance on the use of antibiotics to treat traveler’s diarrhea, special considerations for unique types of travel (i.e. wilderness expeditions, work-related travel, and studying abroad), and fully revised advice for specific destinations in international travel. FEATURES • Pre-travel vaccinations and preventative care • Destination specific guidelines with sections on Cuba and Burma • Advice for travelers with specific health needs (pregnant women, travelers with chronic illness, etc.) • Practical tips for last minute or resource limited travelers • Recommendations for air crews, humanitarian workers, missionaries, and others who provide care and support overseas • Easy to use reference maps, tables, and charts • Notes for making custom notes and highlights within entries • Full Text Search to find specific topics quickly • "Favorites" for bookmarking important topics EDITOR-IN-CHIEF: Gary W. Brunette Publisher: Oxford University Press Powered by: Unbound Medicine Unbound Privacy Policy: www.unboundmedicine.com/privacy Unbound Terms of Use: https://www.unboundmedicine.com/end_user_license_agreement

About

ABOHNS

Read full description

The Otolaryngology Training Examination (OTE) is a closed-book, proctored, timed examination which is offered once a year. Any resident, practicing otolaryngologist-head and neck surgeon, or other interested physician may register for the OTE. Purpose The OTE provides an assessment of current knowledge in all areas of otolaryngology-head and neck surgery. Exam results identify strengths and weaknesses. Exam scores are confidential for practitioners; resident’s scores are reported to training program directors. Residents and their program directors use the OTE to establish a baseline of specialty knowledge at the beginning of training, and to monitor changes in that knowledge over time. It is inappropriate for program directors to use this measure of resident performance as the sole form of assessment when evaluating residents for advancement. Rather, it is appropriate for program directors to use the aggregate performance of their residents when evaluating the strengths and weaknesses of their educational program.

Screenshots

CDC Yellow Book4 screens

Verdict

The call

The clearest difference is in-app purchases: ABOHNS at none against CDC Yellow Book's 2. ABOHNS also leads on iOS requirement (9.3 vs 15.0). CDC Yellow Book's advantage is update cadence (every 17 months vs every 47 months) and device support (3 vs 1). On price and ads 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. CDC Yellow Book sells 1 one-off in-app purchase. ABOHNS asks for nothing beyond the download.

UpkeepUpdate frequency

CDC Yellow Book ships an update every 17 months, ABOHNS every 47 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard4 real differences · 6 level
CDC Yellow Book versus ABOHNS: the parameters behind the verdict, then further details
ParameterCDC Yellow BookABOHNS
PriceFreeFree
Rating4.2 (69 ratings) — better—
Positive reviews20.0% of reviews—
Number of ratings69 — better—
Update frequencyEvery 17 months — betterEvery 47 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPad
Requires iOS15.09.3 — better
Further details — not scored
Size10 MB5 MB
Age rating17+17+
DeveloperUnbound Medicine, Inc.Internet Testing Systems (ITS)

In-app purchases

1 purchases

CDC Yellow Book

One-time1
  • CDC Yellow Book2 variants$29.99
None

ABOHNS

No in-app purchases

Questions

Is CDC Yellow Book free?
CDC Yellow Book is free to download, with in-app purchases available.
Is ABOHNS free?
ABOHNS is free to download, with no in-app purchases.
Do CDC Yellow Book or ABOHNS have ads?
Neither CDC Yellow Book nor ABOHNS shows ads.
Which is updated more often, CDC Yellow Book or ABOHNS?
CDC Yellow Book ships an update every 17 months, and ABOHNS every 47 months. Most recently, CDC Yellow Book was updated on November 2, 2026 and ABOHNS on November 3, 2026.

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