Comparison

Hidden Codes vs Zeitzeugen 1945

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

Head to head
About

Hidden Codes

This educational game simulates a social media environment to teach young people about online radicalization. Players learn to identify problematic content and understand how extremist groups use digital media. It addresses topics like political codes, conspiracy myths, and how to respond to radicalization in one's social circle.

Highlights
  • Simulated social media environment
  • Identify problematic content
  • Understand extremist online tactics
  • Learn about political codes and myths
  • Guidance on responding to radicalization
Features
Read full description

HIDDEN CODES ist ein Mobile Game der Bildungsstätte Anne Frank und widmet sich dem Thema Radikalisierung im Netz. In einer simulierten Social Media-Umgebung chatten die Spieler*innen, durchstöbern Profile und reagieren auf Storys und Kommentare anderer Nutzer*innen. Die App befähigt junge Menschen spielerisch dazu, problematische Inhalte oder Aussagen zu erkennen und kompetent darauf zu reagieren: Wie nutzen radikale Gruppen digitale Medien, um zu für ihre Zwecke zu mobilisieren? Welche politischen Codes und Verschwörungsmythen werden im Netz verbreitet? Was kann ich tun, wenn ich mitbekomme, dass sich jemand in meinem Umfeld radikalisiert? Spezifische Themen und Elemente rechter und islamistischer Radikalisierung werden in einzelnen Episoden beleuchtet.

About

Zeitzeugen 1945

Experience historical accounts of post-war hardship through augmented reality. Contemporary witnesses share their stories of hunger, cold, and trauma, virtually embedded in ruined landscapes and interactive rooms. Designed for educational use, it brings the "years of rubble" to life for students.

Highlights
  • Augmented reality historical witness accounts
  • Interactive 360° ruin landscapes
  • Offline usability
  • Integrated teaching materials and worksheets
  • Historical context and factual information
Read full description

"Zeitzeugen 1945 – The years of rubble in AR" is the follow-up project to the interactive app "WDR AR 1933-1945" for use in the classroom. Contemporary witnesses talk about their extreme hardships after the end of the war: hunger and cold, trauma and guilt, working as a "rubble woman", and the difficult return of their fathers from war and captivity. The app has received the Educational Media Award (Pädagogischer Medienpreis) as well as the AVRIL 2025 award (silver) and has been nominated for the Prix Europa. We welcome feedback at ar@wdr.de and a rating. WHAT’S IT ABOUT? Helga Cent-Velden was 18 when she had to clear ammunition and debris in Berlin. In the chapter "Rubble woman in Berlin”, she is virtually embedded in a 360° landscape of ruins. In the chapter "The big freeze", Marianne Blasberg recalls the terrible winter of 1946/47 when it was so cold that the Rhine froze over. In the scene, even the tablet screen seems to freeze. The classroom is transformed into a cellar, its ceiling covered with icicles. Alfred Grünewald, Anne Priller-Rauschenberg, and Ruth Barra appear in the chapter "Hunger and survival" after users walk through a portal that leads to an interactive room. Here the contemporary witnesses talk about being tormented by hunger, risking their lives while searching for something to eat and the all-consuming dream of sausage and bread. In the chapter "War and trauma", Erich Waaser tells the story of his father, who, as a communist, was deported to the Börgermoor concentration camp by the Nazis and who, after the war, was left disillusioned by the denazification process. Marianne Blasberg’s father, a musician, also returned from the war traumatized. THE APP IN SCHOOL LESSONS In the app, teachers will find a package of teaching materials and worksheets for social studies. The app is suitable for inclusive learning groups. The core target group is secondary students in the 9th and 10th grades. The app cuts across subjects and can be adapted to different learning levels in a differentiated way. IT’S EASY TO USE! Pan your tablet or smartphone camera across the floor to scan it. Then aim at an empty space on the floor at least 2.5 meters away from you. A red circle appears. Once the circle is completely filled, the contemporary witnesses are automatically positioned. As they tell their stories, you can use look around the room and experience the stories. FEATURES • The WDR app "Zeitzeugen 1945" can be used offline. Once it has been downloaded, it can be used independently of network quality. • It is easy to use and suitable for diverse learning groups. • Contemporary witnesses and their biographies are an important part of the app. • There is an info guide who adds facts to personal memories and puts them in their historical context. • The WDR app "Zeitzeugen 1945 – The years of rubble in AR" is free of charge. WHAT DOES AUGMENTED REALITY MEAN? Augmented reality (AR) is a technology that allows contemporary witnesses to be virtually positioned in real spaces, as can three-dimensional animations. Augmented reality mixes the real world and virtual elements. The contemporary witnesses appear to be actually talking to you face to face. TECHNICAL INFORMATION The app has a total data volume of 2 GB. Please use Wi-Fi to download it.

Screenshots

Hidden Codes3 screens
Zeitzeugen 19454 screens

Verdict

The call

The clearest difference is review sentiment: Zeitzeugen 1945 at 86% against Hidden Codes's 47%. Zeitzeugen 1945 also leads on update cadence (every 3 weeks vs every 2 months). On price, ads, in-app purchases and monetization model 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Hidden Codes ships an update every 2 months, Zeitzeugen 1945 every 3 weeks. Both last shipped on October 24, 2026.

Scorecard2 real differences · 8 level
Hidden Codes versus Zeitzeugen 1945: the parameters behind the verdict, then further details
ParameterHidden CodesZeitzeugen 1945
PriceFreeFree
Rating1.0 (1 ratings) — better—
Positive reviews47.4% of reviews86.4% of reviews — better
Number of ratings1 — better—
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.0 — better15.0
Further details — not scored
Size202 MB1.8 GB
Age rating12+12+
DeveloperMeron MendelWDR

Customer experience

Hidden Codes

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews19 reviews
Positive47.4%
Neutral21.1%
Negative31.6%

Zeitzeugen 1945

Written reviews22 reviews
Positive86.4%
Neutral0.0%
Negative13.6%

In-app purchases

None

Hidden Codes

No in-app purchases

None

Zeitzeugen 1945

No in-app purchases

Questions

Is Hidden Codes free?
Hidden Codes is free to download, with no in-app purchases.
Is Zeitzeugen 1945 free?
Zeitzeugen 1945 is free to download, with no in-app purchases.
Do Hidden Codes or Zeitzeugen 1945 have ads?
Neither Hidden Codes nor Zeitzeugen 1945 shows ads.
Which is updated more often, Hidden Codes or Zeitzeugen 1945?
Hidden Codes ships an update every 2 months, and Zeitzeugen 1945 every 3 weeks. Most recently, Hidden Codes was updated on October 24, 2026 and Zeitzeugen 1945 on October 24, 2026.

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