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73
BU Score
Strong

Kartenheld

4.8 ✍️ Editor
✍️ BU Analytics Review

Kartenheld is an iOS app from Kitestack Software in the News category, currently rated 4.8★ across 873 ratings. Initial signal reads as mixed reviews — supporters praise core features while critics cite stability/value gaps.

Our BU Score puts it at 73Strong (healthy traction). For a News app, that means healthy traction.

Track changes month-over-month in the Performance section below — live snapshot history and revenue forecast included.

📊 Performance Tracking LIVE

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idle
0%
Rating
Reviews
Forecast Revenue / mo
Snapshots tracked
0
since first record
Range:

💰 Forecast Revenue / mo

MODEL
Revenue forecast computed from BU's 234 trigger model on each snapshot. Calibrated against ground-truth from 58 verified-revenue apps.
🔬Forecast Breakdown — Why This Estimate?Top 10 of 10 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
Paid app ($0.00)METRIC
+$2,800
Excellent rating (4.8★)METRIC
+$2,200
worth every pennyREVIEW
+$2,000
bugsREVIEW
−$1,800
5 starREVIEW
+$1,800
excellent appREVIEW
+$1,500
Mature app (12y old)METRIC
+$1,500
highly recommendREVIEW
+$1,400
priceyREVIEW
−$800
Early-stage install base (873 ratings)METRIC
+$400
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)

📈 Reviews Growth

LIVE
Cumulative review count from first BU snapshot. Each point = a tracked update.
💚Sentiment Over Time↑ green = positive · ↓ red = negative
Jun 24
Jul 24
Aug 24
Feb 25
Apr 25
Jul 25

⭐ Rating Trend

LIVE
Average rating evolution. Updates with each new review batch.

🗓️ Snapshot Timeline

HISTORY
Each bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →
💾 7 MB🔞 4+📱 iOS 14.1+🔖 v3.7.3🔄 updated 8mo ago🌐 EN, DE📂 News💰 Paid🚀 Launched 2014 (12y old)

📝 About this app

Make your own flash cards and take the pressure out of test preparation. Flashcard Hero keeps track of what facts you already know so you can focus on what you don’t know and save a lot of time.

We made Flashcard Hero for those of you who want to fit more than a few words on each card. You can add images, lists, and use text formatting to structure your content.

- Write cards on your iPhone/iPad

- Add images

- Group cards into topics

- Text formatting & lists

- Find and study only difficult cards

- iCloud Drive support (syncs with the Mac app, which is a separate purchase)


Study Options:

- Memorizing cards by covering the answer

- Multiple Choice tests with randomly picked or predefined answers

- Supports studying with the Spaced Repetition System (Leitner Box System)


For Teachers and Educators:

- Compatible with the Remote Control feature of the Mac app. You can use the iOS app as a remote to control the study mode on the Mac while you are projecting on a big screen.



People use the Flashcard Hero Mac & iOS apps to study many different subjects. Here’s a short list of the most popular subjects based on the over 2 million cards that users have shared among each other so far:

- Medicine (anatomy, physiology, pharmacology, genetics)
- Psychology
- Law & business administration (economics, marketing, international law)
- History and politics
- Languages (Latin, Chinese, Greek, Italian, Spanish, German)
- Social sciences
- Music and music theory
- Space physiology (how cool is that?)
- Many more…

You see a lot of subjects in the top ranks where people have to memorize a lot of “structured” information. That’s because Flashcard Hero is designed specifically to go beyond language learning, offering more room on each card for facts, lists, and images. You can also organize cards into topics (to match chapters of a text book, for example).

Note: This app is a single, one-time purchase. No subscriptions, no in-app purchases, no ads. The App Store might list the app as having in-app purchases, but those are only for backwards compatibility with an earlier version of the app. With this download, you get all features right away.

🆕 What's New · v3.7.3

Fixed an issue with verifying App Store purchases

Profile & Insights

Everything we know — and don't — about this app and its company.

Identification

App name
Kartenheld
Developer
Kitestack Software
Bundle ID
com.flashcardhero.mobile
App Store URL
Open in App Store
Category
News
Content rating
4+
Languages
EN, DE

Company

Website
flashcardhero.com
Tagline
Flashcard Hero for Mac
Description
Flashcard Hero is a flash cards app to make flashcards on your Mac. Study on Mac & iPhone/iPad via iCloud. The app keeps track of the study progress for each card and supports Spaced Repetition.
Founded
Not found
HQ / Address
Not found
Employees
Not found
Logo
OG image

Revenue

Verified revenue / mo
Not found
AI revenue estimate / mo
Not found
AI annual estimate
Not found
ML model estimate / mo
$23.6K/mo
Top-grossing rank
Outside top 100 in US News
All-time revenue
Not found
Pricing
Not found

Founder

Name
Not found
X / Twitter
Not found
LinkedIn
Not found
GitHub
Not found
X followers
Not found
Public statements
Not found

Funding

Total raised
Not found
Last round
Not found
Investors
Not found
Crunchbase
Not found
AngelList
Not found

Press & Links

Articles found
Not found
Listed on
Not found
Blog
http://flashcardhero.com/blog/
Press / News
Not found

Contacts & Socials

Socials
Not found
Email
Not found
Phone
Not found
Contact page
Not found
About page
Not found
📈Ratings growth873 ratings+694% lifetimeShow 3-year history estimate ▾Aug 2018Jul 2022May 2026
Tracked (60 weeks) Pre-tracking estimate (37 weeks) · model-based, ±5% noise · anchored to release date and current value
🌍Geographic ReachNot ranked
This app is currently outside the top 100 grossing in all 9 countries we monitor (US, UK, DE, FR, JP, CA, AU, BR, IN). Niche or new apps often launch this way — popularity rankings appear once daily revenue clears the regional threshold.
Profile is built from iTunes Lookup + developer site scrape + ML revenue model. Empty fields show "Not found" — additional sources (Crunchbase, X, IndieHackers, Acquire.com) coming.
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