CITB Op/Spec HS&E test vs Duolingo: Language Lessons

CITB Op/Spec HS&E test

CITB
App Store
$112/mo
~$1.3K/yr · 600 installs
VS

Duolingo: Language Lessons

Duolingo
App Store
$20.79M/mo
~$249.50M/yr · 600.0M installs
Revenue winner Duolingo: Language Lessons wins +18563599% vs other
Installs winner Duolingo: Language Lessons wins +99999900% vs other
MAU winner Duolingo: Language Lessons wins +158402104% vs other
Rating winner CITB Op/Spec HS&E test wins +6% vs other

Why Duolingo: Language Lessons is winning

Top 4 reasons - backed by the public App Store / Play Store numbers.

  1. Duolingo: Language Lessons earns roughly 185637× more per month than CITB Op/Spec HS&E test - $20.79M vs $112.
  2. Subscription model. Duolingo: Language Lessons runs a $9.99/mo subscription that compounds; CITB Op/Spec HS&E test relies on one-shot IAP or ads.
  3. Bigger install base. Duolingo: Language Lessons has ~600.0M lifetime installs vs CITB Op/Spec HS&E test's ~600 - 1000000.0× the funnel top.
  4. More monetization surfaces. Duolingo: Language Lessons runs 6 IAP tiers vs 0 - more chances to convert users at the right price.

→ Find more apps with this revenue gap · Full Duolingo: Language Lessons report

Side-by-side metrics

Bars scale to whichever app is bigger on that row. Green = winner.

CITB Op/Spec HS&E test
vs
Duolingo: Language Lessons
Monthly revenue (est.)?
$112
▶
$20.79M
Annual revenue (est.)
$1.3K
▶
$249.50M
Lifetime installs (est.)
600
▶
600.0M
Monthly active users (est.)?
72.6
▶
115.0M
App Store rating
5.00★
◀
4.73★
Total ratings
12
▶
5.1M
US grossing rank
-
▶
#36
Cheapest monthly sub
No sub
▶
$9.99
IAP tiers detected
0 tiers
▶
6 tiers

CITB Op/Spec HS&E test

CITB
App Store
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
View full CITB Op/Spec HS&E test report →

Duolingo: Language Lessons

Duolingo
App Store
Category
Education
Price
Free
Released
Nov 13, 2012
Last updated
May 5, 2026
File size
498.6 MB
Content rating
4+
Version
7.121.0
Languages
Arabic, BN, Czech, Dutch, English, French +22 more
View full Duolingo: Language Lessons report →

CITB Op/Spec HS&E test trajectory

JunJulAugSepOctNovDecJanFebMarAprMay

Duolingo: Language Lessons trajectory

JunJulAugSepOctNovDecJanFebMarAprMay

Related app pages

CITB Op/Spec HS&E test App Store page →Duolingo: Language Lessons App Store page →

Related comparisons

Citb Op Spec Hs E Test iOS vs Official Dvsa Theory Test Kit iOSCitb Op Spec Hs E Test iOS vs Driving Theory Test 4 in 1 Kit iOSCitb Map Hs E Test V10 iOS vs Citb Op Spec Hs E Test iOSAnkimobile Flashcards iOS vs Citb Op Spec Hs E Test iOSCitb Op Spec Hs E Test iOS vs Official Life in the Uk Test iOSCitb Op Spec Hs E Test iOS vs The Official Dvsa Highway Code iOS

Compare another pair

FAQ

Which makes more money, CITB Op/Spec HS&E test or Duolingo: Language Lessons? v
Duolingo: Language Lessons earns about $20.79M per month, while CITB Op/Spec HS&E test earns about $112. That is a 185637.0× revenue gap (~$20.79M more per month for Duolingo: Language Lessons). Annual revenue: CITB Op/Spec HS&E test ≈ $1.3K/year, Duolingo: Language Lessons ≈ $249.50M/year. Estimates are derived from public App Store signals - grossing rank, scraped IAP tiers, ratings and category benchmarks.
Which has more downloads, CITB Op/Spec HS&E test or Duolingo: Language Lessons? v
Duolingo: Language Lessons leads with about 600.0M estimated downloads vs 600 for CITB Op/Spec HS&E test - a 1000000.0× gap. CITB Op/Spec HS&E test's App Store downloads are estimated from 12 ratings × the standard 1:75 ratio. Duolingo: Language Lessons's App Store downloads are estimated from 5.1M ratings.
Are CITB Op/Spec HS&E test and Duolingo: Language Lessons in the same App Store category 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.
What in-app purchases and subscription pricing do CITB Op/Spec HS&E test and Duolingo: Language Lessons offer? v
CITB Op/Spec HS&E test: no IAP detected on the public listing. Duolingo: Language Lessons: IAP range 6 tiers detected. CITB Op/Spec HS&E test runs a "Paid app ($6.99)" monetization model; Duolingo: Language Lessons runs "Subscription (~$9.99/mo, language) · calibrated by US grossing rank #36". Scraped tier prices and detected subscription pricing drive the bulk of the per-app revenue estimate above.
Which has better ratings, CITB Op/Spec HS&E test or Duolingo: Language Lessons? v
CITB Op/Spec HS&E test edges ahead with ★ 5.0 vs ★ 4.7 (gap of 0.3 stars). Rating volume: CITB Op/Spec HS&E test 12 ratings, Duolingo: Language Lessons 5.1M ratings. Higher rating volume = stronger ASO signal even when star averages are close.
How accurate are these CITB Op/Spec HS&E test vs Duolingo: Language Lessons 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 $20.79M for Duolingo: Language Lessons are derived from App Store grossing rank, 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 Duolingo: Language Lessons to a different App Store app? v
Use the search box at the bottom of this page or paste any two App Store 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.