Comparison

Artemis Mission Tracker vs Deja Entendu Study

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

Head to head
About

Artemis Mission Tracker

Follow humanity's return to the Moon and NASA's Moon Base program. Get live countdowns to mission milestones, crew profiles, and mission overviews. Access curated launch history and important mission documents.

Highlights
  • Live countdowns to mission milestones
  • Full crew profiles
  • Mission overview with SLS, Orion, Starship HLS, and Gateway context
  • NASA announcements and live event alerts
  • Curated launch history
  • Key mission documents
Features
Read full description

ARTEMIS MISSION TRACKER: EVERY ARTEMIS MISSION IN ONE APP Follow NASA's return to the Moon. Artemis II flew four astronauts around the Moon in April 2026, the first crewed lunar mission in more than fifty years. Artemis III is next: a crewed docking rehearsal in Earth orbit with the Starship HLS and Blue Moon landers, ahead of the first landing, now planned for Artemis IV. FREE IN THE APP • A countdown to Artemis III, kept in step with the latest launch schedule. • All five Artemis missions at a glance, from the first SLS flight in 2022 to the missions still ahead. • Crew profiles for Artemis II (Wiseman, Glover, Koch, Hansen) and Artemis III (Bresnik, Parmitano, Rubio, Douglas). • The hardware explained: SLS, Orion, Starship HLS, Blue Moon Mk2 and the AxEMU spacesuit. • Step-by-step mission timelines. • Mission updates in the app, and optional alerts when launch dates move or crews are named. • Made for iPhone Duo: two columns unfolded, a compact layout folded. ARTEMIS+ (PREMIUM) • The Artemis Briefing: Wednesday deep-dives and a short Sunday Week Ahead, plus member-only mission notes inside the app. • Live tracking and telemetry, including a 3D replay of the whole Artemis II flight from launch to splashdown. • Space weather: solar flares, coronal mass ejections and geomagnetic storms, with a home screen widget. • NASA mission photos and videos. Sober coverage, no clickbait. Monthly ($3.99 with a 7-day free trial) or yearly ($19.99). Cancel anytime. SUBSCRIPTION DETAILS • Artemis+ Monthly: $3.99 per month, includes a 7-day free trial • Artemis+ Yearly: $19.99 per year Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours prior to the end of the current period. You can manage your subscription and turn off auto-renew in your Apple Account settings after purchase. Any unused portion of a free trial period is forfeited when you purchase a subscription. Terms of Use (EULA): https://artemistracker.app/terms-of-use.html Privacy Policy: https://artemistracker.app/privacy-policy.html BUILT BY SPACE NERDS Made in Norway by Orbital Momentum AS, an independent developer who watches every launch. No ads, no gimmicks, just a clean tool for following the Moon program. Header image: NASA. Artemis Mission Tracker is independent and not affiliated with NASA. Clear skies.

About

Deja Entendu Study

This app helps you learn languages by transcribing audio and images into flashcards. It offers on-device processing for privacy and allows you to import notes or audio files. New features include pronunciation speed control and direct speech input.

Highlights
  • Transcribe audio and images
  • Create flashcards
  • On-device processing
  • Import class notes
  • Translate audio files
  • Adjust pronunciation speed
  • Direct speech input
Features
Read full description

Déjà Entendu ("Already heard" in French) allows iOS, iPadOS and macOS owners to dive into translate, transcribe and create flash cards from images, recordings or sound samples on their device. It is not a cloud service. So you can be assured that any use of the on-device content analysis that Apple Intelligence performs stays private to you. Import your class notes provided by teachers or translate mp3 files and audio clips that you've made or that you've purchased previously. New options for speeding or slowing pronunciation guides is introduced with the updated version along with options for direct speech input to the transcription tool. Social channels for extra How To instructions are accessible from the Home Tab. We hope you enjoy learning more of the languages that inspire you through our apps!

Screenshots

Artemis Mission Tracker4 screens
Deja Entendu Study4 screens

Verdict

The call

The clearest difference is review sentiment: Deja Entendu Study at 100% against Artemis Mission Tracker's 24%. Deja Entendu Study also leads on rating (5.0 vs 4.2) and in-app purchases (none vs 7). Artemis Mission Tracker's advantage is price (Free vs $0.99) and update cadence (every 5 days vs every 2 weeks). On ratings volume, ads, device support and iOS requirement 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

Artemis Mission Tracker is free to download; Deja Entendu Study costs $0.99 up front. Artemis Mission Tracker sells 7 in-app purchases, starting at $3.99 per month. Deja Entendu Study asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Deja Entendu Study holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 5 and 11 respectively. Written reviews point the same way: 24% of Artemis Mission Tracker's written reviews are positive against 100% of Deja Entendu Study's.

UpkeepUpdate frequency

Artemis Mission Tracker ships an update every 5 days, Deja Entendu Study every 2 weeks. Both last shipped on October 31, 2026.

Scorecard6 real differences · 4 level
Artemis Mission Tracker versus Deja Entendu Study: the parameters behind the verdict, then further details
ParameterArtemis Mission TrackerDeja Entendu Study
PriceFree — better$0.99
Rating4.2 (5 ratings)5.0 (11 ratings) — better
Positive reviews24.1% of reviews100.0% of reviews — better
Number of ratings511 — better
Update frequencyEvery 5 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium — betterPaid
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.426.0 — better
Further details — not scored
Size25 MB2 MB
Age rating4+4+
DeveloperOrbital Momentum ASChristopher Arnold

Customer experience

Artemis Mission Tracker

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews54 reviews
Positive24.1%
Neutral9.3%
Negative66.7%

Deja Entendu Study

All ratings11 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

7 purchases

Artemis Mission Tracker

Subscriptions2
  • Artemis+ Monthly7 Days trial$3.991 Month
  • Artemis+ Yearly7 Days trial$19.991 Year
One-time5
  • Small Tip$1.99
  • Mission Control$3.99
  • Medium Tip$4.99
Show 2 more
  • Large Tip$9.99
  • Artemis+ Lifetime$49.99
None

Deja Entendu Study

No in-app purchases

Questions

Is Artemis Mission Tracker free?
Artemis Mission Tracker is free to download, with in-app purchases available.
Is Deja Entendu Study free?
Deja Entendu Study costs $0.99, with no in-app purchases.
Which has better reviews, Artemis Mission Tracker or Deja Entendu Study?
Deja Entendu Study is rated higher. Artemis Mission Tracker averages 4.2 out of 5 from 5 ratings, while Deja Entendu Study averages 5.0 from 11 ratings.
Do Artemis Mission Tracker or Deja Entendu Study have ads?
Neither Artemis Mission Tracker nor Deja Entendu Study shows ads.
Which is updated more often, Artemis Mission Tracker or Deja Entendu Study?
Artemis Mission Tracker ships an update every 5 days, and Deja Entendu Study every 2 weeks. Most recently, Artemis Mission Tracker was updated on October 31, 2026 and Deja Entendu Study on October 31, 2026.

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