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
Google Play
$9.16M/mo
~$109.98M/yr · 906.0M installs
Revenue winner Duolingo: Language Lessons wins +8182882% vs other
Installs winner Duolingo: Language Lessons wins +151004707% vs other
MAU winner Duolingo: Language Lessons wins +43678976% vs other
Rating winner CITB Op/Spec HS&E test wins +6% vs other

Why Duolingo: Language Lessons is winning

Top 3 reasons - backed by the public App Store / Play Store numbers.

  1. Duolingo: Language Lessons earns roughly 81830× more per month than CITB Op/Spec HS&E test - $9.16M vs $112.
  2. Subscription model. Duolingo: Language Lessons runs a $15.41/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 ~906.0M lifetime installs vs CITB Op/Spec HS&E test's ~600 - 1510048.1× the funnel top.

→ 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
▶
$9.16M
Annual revenue (est.)
$1.3K
▶
$109.98M
Lifetime installs (est.)
600
▶
906.0M
Monthly active users (est.)?
72.6
▶
31.7M
App Store rating
5.00★
◀
4.72★
Total ratings
12
▶
45.0M
US grossing rank
-
=
-
Cheapest monthly sub
No sub
▶
$15.41
IAP tiers detected
0 tiers
=
0 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
Google Play
Category
Education
Price
Free
Released
May 29, 2013
Last updated
May 4, 2026
File size
-
Content rating
Everyone
Version
VARY
Languages
-
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 Play Store page →

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Compare another pair

FAQ

Which makes more money, CITB Op/Spec HS&E test or Duolingo: Language Lessons? v
Duolingo: Language Lessons earns about $9.16M per month, while CITB Op/Spec HS&E test earns about $112. That is a 81829.8× revenue gap (~$9.16M more per month for Duolingo: Language Lessons). Annual revenue: CITB Op/Spec HS&E test ≈ $1.3K/year, Duolingo: Language Lessons ≈ $109.98M/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 Duolingo: Language Lessons? v
Duolingo: Language Lessons leads with about 906.0M estimated downloads vs 600 for CITB Op/Spec HS&E test - a 1510048.1× gap. CITB Op/Spec HS&E test's App Store downloads are estimated from 12 ratings × the standard 1:75 ratio. Duolingo: Language Lessons reports 500,000,000+ installs on Google Play.
Are CITB Op/Spec HS&E test and Duolingo: Language Lessons 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.
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 $0.99 - $239.99 per item. CITB Op/Spec HS&E test runs a "Paid app ($6.99)" monetization model; Duolingo: Language Lessons runs "Subscription (~$15.41/mo, language)". 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 940K 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 $9.16M for Duolingo: Language Lessons 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 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 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.