Comparison

Dohaa! vs Chem Formula Sheet by CS team

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

Head to head
About

Dohaa!

Master new words with interactive lessons and an extensive word bank. Tailor your learning with personalized features, track progress, and explore vocabulary in multiple languages. Enjoy a user-friendly interface for an engaging language skill enhancement.

Highlights
  • Interactive vocabulary lessons
  • Extensive word bank with definitions and audio
  • Personalized learning paths
  • Progress tracking and statistics
  • Support for multiple languages
  • User-friendly interface
Features
Read full description

Master new words and expand your vocabulary with Dohaa - Learn Vocabulary! With our interactive and engaging app, you can enhance your language skills while having fun. Learn Vocabulary: Improve your vocabulary with our comprehensive word bank that covers a wide range of categories, including common words, idioms, phrases, and more. Whether you're a beginner or an advanced learner, Dohaa has the right content to help you expand your word knowledge. Extensive Word Bank: Access Oxford verified 500* carefully curated words, each with detailed definitions, examples, and audio pronunciations. Discover synonyms, antonyms, and related words to enrich your vocabulary further. Our app covers a wide range of topics, ensuring that you learn words relevant to your interests and goals. Personalized Learning: Tailor your learning experience with Dohaa's personalized features. Track your progress, set goals, and receive recommendations based on your performance. Our adaptive learning algorithm adapts to your strengths and weaknesses, providing targeted exercises to help you improve efficiently. Multiple Languages: Dohaa supports multiple languages, allowing you to learn vocabulary in your preferred language. Switch between languages effortlessly and explore new words in different contexts. Progress Tracking: Stay motivated by tracking your progress and witnessing your improvement over time. Dohaa provides detailed statistics and insights into your learning journey, allowing you to celebrate milestones and identify areas for further growth. User-Friendly Interface: Enjoy a seamless learning experience with our intuitive and user-friendly interface. Navigate through lessons, word lists, and games effortlessly, making your vocabulary learning journey enjoyable from start to finish. Download Dohaa - Learn Vocabulary now and embark on an exciting journey to enhance your language skills. Start expanding your word power today!

About

Chem Formula Sheet by CS team

Features
Read full description

Need chemistry answers—fast? Chem Formula Sheet is your clean, reliable companion for class, lab, and exam prep. Find the right formula in seconds, run a quick calculation, and explore the periodic table without getting lost in jargon. It’s easy, beautiful, and works offline. Why you’ll love it • All the essentials in one place: From pH and molarity to gas laws and thermodynamics. • Tap to understand: Short, friendly explanations with example problems. • Instant calculators: Solve pH, dilution, ideal gas, Gibbs free energy, half-life, Nernst, and more. • Smart search & favorites: Type a few letters to find what you need, then save it for later. • Interactive periodic table: All 118 elements with key facts at a glance. • Study your way: Quick quizzes with helpful feedback and progress stats. • Looks great, day or night: Light/Dark themes and readable typography. • Offline first: Your formulas and tools are always available—no signal required. What’s inside • Formula Sheets: 100+ clear, organized entries across General, Physical, Analytical, Organic, Electrochemistry, Thermodynamics, and Kinetics. • Calculators: Molarity & dilution, pH/pOH, gas laws, Gibbs free energy ↔ K, Arrhenius, half-life, Nernst, and more. • Periodic Table: Clean layout, quick facts, and premium filters for deeper dives. • Quizzes: Quick 10, Practice by Category, and Mixed Challenge to sharpen skills. • Personalization: Favorites, recents, custom study lists, and theme options. Go Premium to unlock everything • All advanced calculators and full formula/quiz banks • Powerful periodic table filters & quick molar-mass tools • Extra themes, detailed analytics, and priority support • Ad-free, offline access to the entire library Whether you’re revising for a test, checking lab work, or brushing up on fundamentals, Chem Formula Sheet keeps chemistry simple, fast, and stress-free.

Screenshots

Dohaa!4 screens
Chem Formula Sheet by CS team4 screens

Verdict

The call

The clearest difference is ads: Dohaa! at none against Chem Formula Sheet by CS team's shown. Dohaa! also leads on update cadence (every 4 days vs every 6 months) and iOS requirement (13.0 vs 18.4). On price, in-app purchases and device support 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. Dohaa! sells 2 in-app purchases, starting at $5.99 per month and Chem Formula Sheet by CS team sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Dohaa! ships an update every 4 days, Chem Formula Sheet by CS team every 6 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 7 level
Dohaa! versus Chem Formula Sheet by CS team: the parameters behind the verdict, then further details
ParameterDohaa!Chem Formula Sheet by CS team
PriceFreeFree
Rating1.0 (1 ratings) — better—
Positive reviews83.3% of reviews—
Number of ratings1 — better—
Update frequencyEvery 4 days — betterEvery 6 months
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPod — betteriPhone
Requires iOS13.0 — better18.4
Further details — not scored
Size158 MB11 MB
Age rating4+4+
DeveloperBeyturk KirezlikChatStick Company Limited

In-app purchases

2 purchases

Dohaa!

Subscriptions2
  • Monthly Premium3 Days trial$5.991 Month
  • Yearly Subscription3 Days trial$19.991 Year
1 purchases

Chem Formula Sheet by CS team

One-time1
  • Unlock All Feature$1.99

Questions

Is Dohaa! free?
Dohaa! is free to download, with in-app purchases available.
Is Chem Formula Sheet by CS team free?
Chem Formula Sheet by CS team is free to download, with in-app purchases available.
Do Dohaa! or Chem Formula Sheet by CS team have ads?
Chem Formula Sheet by CS team shows ads; Dohaa! does not.
Which is updated more often, Dohaa! or Chem Formula Sheet by CS team?
Dohaa! ships an update every 4 days, and Chem Formula Sheet by CS team every 6 months. Most recently, Dohaa! was updated on November 3, 2026 and Chem Formula Sheet by CS team on October 30, 2026.

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