Comparison

Bluejacketeer vs Julian Calendar

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

Head to head
About

Bluejacketeer

This learning system uses spaced repetition to help Sailors study for Navy-Wide Advancement Exams and Rating Knowledge Exams. It offers personalized study plans, practice exams, and access to essential study materials. Study offline or listen to questions and answers on the go.

Highlights
  • Spaced Repetition learning technique
  • Personalized study plans by subtopic
  • Practice exams and daily quizzes
  • Warfare qualifications study materials
  • Multiple-choice and flashcard modes
  • Offline study with progress sync
  • Audio study mode
Features
Read full description

------------------------------------ What is Bluejacketeer? ------------------------------------ Bluejacketeer is a learning system made for Sailors, by Sailors to help study for the Navy-Wide Advancement Exam and Rating Knowledge Exam. Our system leverages the benefits of a learning technique known as Spaced Repetition (SR). This learning technique is typically used by individuals who need to learn massive amounts of information. ---------------------------------------------------------------- What makes Bluejacketeer so effective? ---------------------------------------------------------------- Know your percentile Our new dashboard keeps track of your performance and shows you how you compare against peers in your rating exam. • Personalized Study Plan Know what to study with a personalized plan based on your study needs by subtopic. We make sure you know what to cover each week so you're ready by exam day. • Highly qualified writers We hire Active Duty or Veteran Sailors with amazing credentials within your rate to write your questions. • Updated Bibliography and Topics We mirror the bibliography and topics released by the Navy Advancement Center for your rating exam, updated each cycle. • Practice Exams & Daily Quizzes Test your knowledge with two timed 175 question practice exams, or every day with a timed daily 20-question quiz. Everyone within your rating exam will get the same quiz or exam, allowing you to compare your performance to your peers. • Warfare Qualifications Included Our platform includes study materials to help you prepare for ESWS, FMF, EAWS. EXW, and SCW guides. • Effective study environment Study with multiple-choice questions, just like on the exam or switch to flashcard mode for better memory retention. After you select your answer, we provide text straight from the reference for additional reading. • Your progress is saved With Bluejacketeer, your progress is saved as you study, allowing you to study in short bursts when you have a few extra minutes. • PDFs on the go We know how difficult it is to obtain all the PDFs listed on your bib. We provide you with access to as many PDFs as possible straight from the Bluejacketeer mobile app and website. • Synchronize to website With our mobile app, you'll be able to study anywhere on the go. No internet connection required. Sync your progress to the website later, when the internet is available. Study offline for up to 30 days. *Audio Study Mode Have time to listen, but not read? We have you covered! With audio study mode, you can listen to questions and answers while you are otherwise busy. Turn that commute and Sweepers into learning time. ---------------------- How it works ---------------------- Simply put, Bluejacketeer improves your ability to remember information by repeatedly showing you the same questions. The more you answer correctly, the less often you see it. Eventually, you'll know the answer to thousands of questions, but you'll only have to review a handful of them a day. It's a quick, simple and incredibly efficient study tool, and will dramatically boost your chances of passing the advancement exam and gaining promotion, while saving you heaps of time! ------------------------------------------ Built for Sailors, by Sailors ------------------------------------------ We built Bluejacketeer based on our own experiences with the Navy-Wide Advancement Exam, with the intent to help our shipmates by providing guidance and structure to their studies. With that mission in mind, we hire active duty and Veteran Sailors with only the best credentials to develop key study material and staff a small but expert team to help you directly with any issues along the way. All the best, -The Bluejacketeer Team "Begin your journey towards promotion today with Bluejacketeer!" Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Julian Calendar

View various Julian Calendar dates, including short, long, and reduced Julian Dates. Supports Lock Screen and Home Screen widgets for easy access to date conversions and calculations.

Highlights
  • View Short Julian Calendar Date
  • View Long Julian Calendar Date
  • View Julian Date
  • View Reduced JD
  • View Modified JD
  • Lock Screen widgets
  • Home Screen widgets
Features
Read full description

Julian Calendar is an all-in-one app for viewing all the different Julian Dates on your phone. The app also supports Lock Screen widgets and Home Screen widgets! Dates supported: - Short Julian Calendar Date - Long Julian Calendar Date - Julian Date - Reduced JD - Modified JD - Truncated JD - Dublin JD - CNES JD - CCSDS JD - Lilian date - Rata Die - Mars Sol Date - Unix time

Screenshots

Bluejacketeer4 screens
Julian Calendar3 screens

Verdict

The call

The clearest difference is review sentiment: Bluejacketeer at 55% against Julian Calendar's 0%. Bluejacketeer also leads on price (Free vs $1.99) and update cadence (fortnightly vs every 5 months). Julian Calendar's advantage is rating (4.6 vs 3.9) and in-app purchases (none vs 1). On ads, device support and iOS requirement 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

Bluejacketeer is free to download; Julian Calendar costs $1.99 up front. Bluejacketeer sells 1 in-app purchase, starting at $24.99 per month. Julian Calendar asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Julian Calendar holds the better App Store score, 4.6 against 3.9. That said, the two scores are not equally well evidenced: Bluejacketeer has 389 ratings behind it against 68, so its average is the more settled of the two. Written reviews complicate that: 55% of Bluejacketeer's written reviews are positive against 0% of Julian Calendar's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Bluejacketeer ships an update fortnightly, Julian Calendar every 5 months. The most recent releases landed on November 6, 2026 and November 4, 2026 respectively.

Scorecard8 real differences · 3 level
Bluejacketeer versus Julian Calendar: the parameters behind the verdict, then further details
ParameterBluejacketeerJulian Calendar
PriceFree — better$1.99
Rating3.9 (389 ratings)4.6 (68 ratings) — better
Positive reviews55.2% of reviews — better0.0% of reviews
Number of ratings389 — better68
Update frequencyFortnightly — betterEvery 5 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
Best chart rank#200 — better—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.115 — better
Further details — not scored
Size48 MB1 MB
Age rating4+4+
DeveloperKaplanApplorium Ltd

Customer experience

Bluejacketeer

All ratings389 ratings
Positive70.4%
Neutral6.4%
Negative23.1%
Written reviews116 reviews
Positive55.2%
Neutral8.6%
Negative36.2%

Julian Calendar

All ratings67 ratings
Positive89.6%
Neutral3.0%
Negative7.5%
Written reviews2 reviews
Positive0.0%
Neutral50.0%
Negative50.0%

Bugs and requests

Bluejacketeer

Reported bugs

4 issues
  • App freezing and crashing
  • Sync issues and data loss
  • Login problems for new users
  • Incompatibility with certain devices

Requested features

4 requests
  • Audio mode for studying
  • More up-to-date study content
  • Improved offline functionality
  • Better rating selection options

Julian Calendar

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Bluejacketeer

Subscriptions1
  • Monthly subscription$24.991 Month
None

Julian Calendar

No in-app purchases

Questions

Is Bluejacketeer free?
Bluejacketeer is free to download, with in-app purchases available.
Is Julian Calendar free?
Julian Calendar costs $1.99, with no in-app purchases.
Which has better reviews, Bluejacketeer or Julian Calendar?
Julian Calendar is rated higher. Bluejacketeer averages 3.9 out of 5 from 389 ratings, while Julian Calendar averages 4.6 from 68 ratings.
Do Bluejacketeer or Julian Calendar have ads?
Neither Bluejacketeer nor Julian Calendar shows ads.
Which is updated more often, Bluejacketeer or Julian Calendar?
Bluejacketeer ships an update fortnightly, and Julian Calendar every 5 months. Most recently, Bluejacketeer was updated on November 6, 2026 and Julian Calendar on November 4, 2026.

Other comparisons