Comparison

Flashcard Dictionary vs Mars Terraforming Project

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

Head to head
About

Flashcard Dictionary

This app helps you memorize new English words by providing definitions, pronunciations, and spaced reviews. Save words, track your progress with color-coded familiarity levels, and utilize AI for enhanced learning. It supports both English and Simplified Chinese interfaces.

Highlights
  • Learner-friendly definitions
  • Native speaker pronunciations
  • Spaced review scheduling
  • Color-coded word familiarity
  • Optional AI-powered review
  • Bilingual interface (English/Chinese)
Features
Read full description

Flashcard Dictionary is an English dictionary that helps you remember the words you look up. Look up a word, read a clear definition written for learners, and hear a native speaker say it. Tap the star to save it and it goes into your Saved Words. From then on Flashcard Dictionary schedules reviews for you: words you know well come back after a long time, words you keep missing come back soon. Flip the card, think, and say whether you remembered. FEATURES • Lookups: definitions from Wiktionary, written for learners of English, with pronunciations recorded by native speakers on Wikimedia Commons. The dictionary comes with the app, so most words look up without a connection. • Saved Words: every saved word is colour-coded by familiarity, from To learn to Learning to Memorized. • Flashcards: the word on the front, the definition and an example on the back. One question per card: do you remember it? • Spaced review: intervals come from the open-source FSRS algorithm, the same family of scheduler Anki uses. Only words that are due are offered, up to 12 cards per session. • AI review (optional): before a card flips, say or type what an English word means, and AI checks your answer. Turn it on from the review card on Home or in Settings › Review mode. • Home: see how many words are due today, how many sit at each familiarity level, and when the next review is. • Recent lookups stay on Home so you can go back to them. • English and 简体中文 interface, switchable in Settings › App language. In 中文, English words also show their Chinese meanings. • Korean: look up and review Korean words too (Settings › Learning language). PREMIUM The free version lets you save 10 words and use every review feature, including 10 AI checks a day. Premium removes the word limit and allows up to 100 AI checks a day. Premium is an auto-renewable subscription billed monthly or yearly through your Apple Account; cancel anytime in Settings › your name › Subscriptions, at least 24 hours before the current period ends. PRIVACY No account needed. Your lookups, saved words and progress stay on your phone. If you turn on AI review, the text of your answer is sent with the word and its meanings to our server in Hong Kong and on to DeepSeek to be checked. Speech is turned into text on your phone, or by Apple's speech recognition when your phone can't do it. We never receive a recording, and our server doesn't keep your answers. Privacy Policy: https://www.yusenzhang.com/flashcard-privacy Terms of Use (Apple's standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Mars Terraforming Project

Explore the science and engineering behind colonizing Mars. Engage in AI-driven narrative adventures that adapt to your choices, offering a unique way to learn about transforming the Red Planet into a habitable world.

Highlights
  • A-Z step-by-step terraforming tutorials
  • AI-generated D&D style Mars games
  • Customizable AI game prompts and actions
  • Educational content on science and engineering
  • Narrative-driven space adventures
Features
Read full description

The Mars Terraforming Project Your Complete A-to-Z Guide to Colonizing and Terraforming Mars! Dreaming of exploring the Red Planet? Take the first step toward making that dream a reality with Mars Terraforming Project, the ultimate app that educates, inspires, and guides you through every aspect of transforming Mars into humanity's second home. Features You'll Love: - A-Z Step-by-Step Tutorials: Learn the science, engineering, and strategies behind terraforming Mars, from the initial stages up to the final aspects. - AI Generated Dungeons and Dragons Style Games: Immerse yourself in narrative-driven adventures set on Mars, where your decisions influence the outcome of the mission (Available with Subscription) - Custom Prompts and Actions: The AI-Generated Games include Custom Actions and Prompts. Whatever you type will become the next outcome of the game (Available with Subscription) Perfect for: Space enthusiasts passionate about Mars exploration. Students and professionals in science, engineering, and space studies. Sci-fi lovers eager to learn real-world concepts behind their favorite stories. Why Mars Terraforming Project? We go beyond the basics to provide a comprehensive guide to Terraforming Mars while making it engaging in a never seen before way through AI GENERATED GAMES. This isn’t just an app; it’s your gateway to humanity’s next chapter. Download Mars Terraforming Project now and start your journey to the Red Planet! The future of humanity awaits—be a part of it! Note: Some features require an additional purchase or subscription. Privacy Policy: https://www.termsfeed.com/live/45de1ba7-5c1b-44b9-965a-c555e08ba3d8 Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Flashcard Dictionary4 screens
Mars Terraforming Project4 screens

Verdict

The call

The clearest difference is update cadence: Mars Terraforming Project at daily against Flashcard Dictionary's weekly. Mars Terraforming Project also leads on iOS requirement (12.0 vs 15.0). On price, rating, ratings volume and ads 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. Flashcard Dictionary sells 2 in-app purchases, starting at $0.99 per month and Mars Terraforming Project sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Mars Terraforming Project holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 5 and 5 respectively.

UpkeepUpdate frequency

Flashcard Dictionary ships an update weekly, Mars Terraforming Project daily. The most recent releases landed on November 7, 2026 and November 4, 2026 respectively.

Scorecard2 real differences · 8 level
Flashcard Dictionary versus Mars Terraforming Project: the parameters behind the verdict, then further details
ParameterFlashcard DictionaryMars Terraforming Project
PriceFreeFree
Rating4.4 (5 ratings)4.6 (5 ratings) — better
Positive reviews50.0% of reviews—
Number of ratings55
Update frequencyWeeklyDaily — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size55 MB42 MB
Age rating4+17+
DeveloperYusen ZhangMadhanrajan Varadharajan

Customer experience

Flashcard Dictionary

All ratings5 ratings
Positive80.0%
Neutral20.0%
Negative0.0%
Written reviews4 reviews
Positive50.0%
Neutral50.0%
Negative0.0%

Mars Terraforming Project

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

Flashcard Dictionary

Subscriptions2
  • Monthly Premium Subscription$0.991 Month
  • Yearly Premium Subscription$9.991 Year
2 purchases

Mars Terraforming Project

Subscriptions2
  • Unlock Pro Monthly$4.991 Month
  • Unlock the annual pro access7 Days trial$19.991 Year

Questions

Is Flashcard Dictionary free?
Flashcard Dictionary is free to download, with in-app purchases available.
Is Mars Terraforming Project free?
Mars Terraforming Project is free to download, with in-app purchases available.
Which has better reviews, Flashcard Dictionary or Mars Terraforming Project?
Mars Terraforming Project is rated higher. Flashcard Dictionary averages 4.4 out of 5 from 5 ratings, while Mars Terraforming Project averages 4.6 from 5 ratings.
Do Flashcard Dictionary or Mars Terraforming Project have ads?
Neither Flashcard Dictionary nor Mars Terraforming Project shows ads.
Which is updated more often, Flashcard Dictionary or Mars Terraforming Project?
Flashcard Dictionary ships an update weekly, and Mars Terraforming Project daily. Most recently, Flashcard Dictionary was updated on November 7, 2026 and Mars Terraforming Project on November 4, 2026.

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