CITB Op/Spec HS&E test vs Bookshelf
CITB Op/Spec HS&E test
CITB
App Store
$112/mo
~$1.3K/yr · 600 installs
VS
Bookshelf
Vital Source Technologies
Google Play
$0/mo
~$0/yr · 4.9M installs
Revenue winner
CITB Op/Spec HS&E test wins
+11200% vs other
Installs winner
Bookshelf wins
+810359% vs other
MAU winner
Bookshelf wins
+381687% vs other
Rating winner
CITB Op/Spec HS&E test wins
+16% vs other
Why CITB Op/Spec HS&E test is winning
Top 2 reasons - backed by the public App Store / Play Store numbers.
- CITB Op/Spec HS&E test earns roughly 112× more per month than Bookshelf - $112 vs $0.
- Better app store reviews. CITB Op/Spec HS&E test sits at 5.00★ vs 4.31★ - store algorithms reward higher-rated apps with more impressions.
→ Find more apps with this revenue gap · Full CITB Op/Spec HS&E test report
Side-by-side metrics
Bars scale to whichever app is bigger on that row. Green = winner.
CITB Op/Spec HS&E test
vs
Bookshelf
Monthly revenue (est.)?
$112
◀
$0
Annual revenue (est.)
$1.3K
◀
$0
Lifetime installs (est.)
600
▶
4.9M
Monthly active users (est.)?
72.6
▶
277K
App Store rating
5.00★
◀
4.31★
Total ratings
12
▶
18K
US grossing rank
-
=
-
Cheapest monthly sub
No sub
=
No sub
IAP tiers detected
0 tiers
=
0 tiers
- Category
- Education
- Price
- USD6.99
- Released
- May 16, 2019
- Last updated
- Jan 8, 2026
- File size
- 148.2 MB
- Content rating
- 12+
- Version
- 6.0.52
- Languages
- English
- Category
- Education
- Price
- Free
- Released
- Mar 29, 2012
- Last updated
- Mar 10, 2026
- File size
- -
- Content rating
- Everyone
- Version
- 11.3.1
- Languages
- -
CITB Op/Spec HS&E test trajectory
Bookshelf trajectory
FAQ
Which makes more money, CITB Op/Spec HS&E test or Bookshelf? v
CITB Op/Spec HS&E test earns about $112 per month, while Bookshelf earns about $0. That is a ∞× revenue gap (~$112 more per month for CITB Op/Spec HS&E test). Annual revenue: CITB Op/Spec HS&E test ≈ $1.3K/year, Bookshelf ≈ $0/year. Estimates are derived from public App Store / Google Play signals - grossing rank, scraped IAP tiers, ratings and category benchmarks.
Which has more downloads, CITB Op/Spec HS&E test or Bookshelf? v
Bookshelf leads with about 4.9M estimated downloads vs 600 for CITB Op/Spec HS&E test - a 8104.6× gap. CITB Op/Spec HS&E test's App Store downloads are estimated from 12 ratings × the standard 1:75 ratio. Bookshelf reports 1,000,000+ installs on Google Play.
Are CITB Op/Spec HS&E test and Bookshelf in the same App Store category on each store and competing for the same money? v
Yes - both apps sit in the Education category, which means they compete directly for the same paying users and category-level wallet share. Direct competitors, head-to-head.
Do CITB Op/Spec HS&E test and Bookshelf have in-app purchases? v
CITB Op/Spec HS&E test does not appear to offer in-app purchases on its public listing. Bookshelf does not appear to offer in-app purchases. Monetization model: CITB Op/Spec HS&E test runs "Paid app ($6.99)", Bookshelf runs "No App Store revenue (monetizes off-store)".
Which has better ratings, CITB Op/Spec HS&E test or Bookshelf? v
CITB Op/Spec HS&E test edges ahead with ★ 5.0 vs ★ 4.3 (gap of 0.7 stars). Rating volume: CITB Op/Spec HS&E test 12 ratings, Bookshelf 4K ratings. Higher rating volume = stronger ASO signal even when star averages are close.
How accurate are these CITB Op/Spec HS&E test vs Bookshelf revenue estimates? v
Directional - typically within 2-3× of actual money earned for popular apps. The $112 for CITB Op/Spec HS&E test and $0 for Bookshelf are derived from App Store grossing rank / Google Play install ranges, scraped IAP tiers, ratings volume and category benchmarks (Education) - net of the 15-30% Apple/Google store cut. Real revenue depends on country mix, retention, refunds and ad fill rate, none of which Apple or Google publish.
How do I compare CITB Op/Spec HS&E test or Bookshelf to a different App Store app? v
Use the search box at the bottom of this page or paste any two App Store or Google Play links into the homepage tool. We auto-generate a permanent comparison URL with revenue, downloads, IAP tiers, subscription pricing and grossing rank for both apps.