Comparison

Oki Doki vs 9Solver AI

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

Head to head
About

Oki Doki

Features
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MASTER ANY LANGUAGE WITH OKI DOKI Oki Doki is the ultimate language learning flashcards app that makes mastering new languages fun, fast, and effective. Whether you're learning Spanish, French, German, Japanese, or any other language, Oki Doki helps you memorize vocabulary with proven spaced repetition techniques. KEY FEATURES UNLIMITED CUSTOM FLASHCARD DECKS - Create unlimited decks for any language pair - Front and back cards with native language support - Add example sentences for better context - Organize your learning materials your way AI-POWERED CARD CREATION - Generate flashcards from photos instantly - Upload images and let AI extract vocabulary - Save hours of manual card creation - Perfect for textbooks, menus, signs, and more SMART SPACED REPETITION - Science-backed learning algorithm - Cards appear at optimal intervals for maximum retention - Track your progress with study sessions - Mark cards as learned to focus on difficult words MULTI-LANGUAGE SUPPORT • Support for 100+ languages - Beautiful country flags for visual identification - Learn multiple languages simultaneously - Perfect for travelers, students, and language enthusiasts - Seamlessly sync all your decks across iPhone and iPad - Never lose your progress - Study on one device, continue on another - Automatic backup of all your flashcards OFFLINE MODE - Full functionality without internet - Study anywhere, anytime - Automatic sync when you're back online - erfect for commuting and traveling BEAUTIFUL & INTUITIVE DESIGN - Modern, clean interface - Smooth animations and interactions - Dark mode support - Easy-to-use card management TRACK YOUR PROGRESS - Monitor daily study streaks - View statistics on learned cards - Celebrate your achievements - Stay motivated with visual feedback SECURE & PRIVATE - Sign in with Google or Apple - Your data is encrypted and secure - Privacy-first approach - No ads, no distractions OKI DOKI PRO (Optional) Unlock premium features: - Unlimited AI-generated cards - Priority sync - Advanced statistics - Ad-free experience - Priority support PERFECT FOR: - Language learners at any level - Students preparing for exams - Travelers learning essential phrases - Professionals expanding vocabulary - Anyone passionate about languages WHY OKI DOKI? Unlike other flashcard apps, Oki Doki combines powerful AI technology with proven learning methods. Our smart spaced repetition algorithm ensures you review cards exactly when you need to, maximizing retention and minimizing study time. Whether you're a beginner learning basic phrases or an advanced learner expanding your vocabulary, Oki Doki adapts to your level and learning pace. DOWNLOAD NOW Join thousands of language learners who trust Oki Doki to accelerate their language learning journey. Download now and start mastering your target language today! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

9Solver AI

Features
Read full description

9Solver AI is an all-in-one AI homework helper and study companion. Solve questions from a photo, understand difficult concepts, and turn your learning materials into lessons you can review. Scan questions in Math, algebra, geometry, physics, chemistry, and biology with your camera. Ask AI Tutor for help, turn PDFs and videos into concise summaries, and use the scientific calculator when needed. SOLVE HOMEWORK FROM A PHOTO Use the camera scanner to capture a question, or upload a photo for a fast, clear answer in Math, Physics, Chemistry, Biology, and more. When you want a deeper explanation, use Ask Follow-up to continue in the context of the same question. CREATE STUDY LESSONS Use an AI summarizer to turn PDFs, YouTube videos, webpages, photos, pasted text, and lecture audio into focused study lessons. - Capture key ideas with a concise summary - Generate quizzes and flashcards for active recall - Build mind maps to connect concepts - Record or upload audio for a clear class recap - Keep the original source and generated materials together - Choose an output language that suits your learning AI TUTOR Ask about a concept, equation, or assignment and continue the conversation without losing context. Mathematical notation is displayed clearly for easier reading. SCIENTIFIC CALCULATOR Work through scientific calculations and unit conversions directly in the app. ORGANIZE AND REVIEW Save solved problems and study lessons, organize them by subject and tags, and return whenever you are ready to review. SUPPORTS MAJOR SUBJECTS - Math: algebra, geometry, trigonometry, calculus, statistics, and word problems - Science: Physics, Chemistry, and Biology - Language and humanities: writing, History, Economics, and Literature WHY CHOOSE 9SOLVER AI? - Get fast answers from photos or typed questions - Ask follow-up questions in the correct problem context - Create study lessons from materials you already use - Review with summaries, quizzes, flashcards, and mind maps - Keep your homework and study resources in one place 9Solver AI helps you solve homework faster, study more actively, and turn everyday learning materials into knowledge you can use. SUBSCRIPTION A subscription is required to access all Premium features. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. Payment will be charged to your Apple ID account at confirmation of purchase. Your account will be charged for renewal within 24 hours before the end of the current period. You can manage or cancel your subscription in your App Store account settings after purchase. Terms of Service: https://9solver.app/term-of-services.html Privacy Policy: https://9solver.app/policy.html

Screenshots

Oki Doki4 screens
9Solver AI4 screens

Verdict

The call

Oki Doki and 9Solver AI are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. Oki Doki sells 2 in-app purchases, starting at $3.99 per month and 9Solver AI sells 7 in-app purchases, starting at $5.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Oki Doki ships an update weekly, 9Solver AI every 10 days. Both last shipped on October 24, 2026.

ScorecardNo meaningful differences
Oki Doki versus 9Solver AI: the parameters behind the verdict, then further details
ParameterOki Doki9Solver AI
PriceFreeFree
Update frequencyWeekly — betterEvery 10 days
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size51 MB110 MB
Age rating12+4+
DeveloperRoman BialekLe Hoang Thi Ngoc

In-app purchases

2 purchases

Oki Doki

Subscriptions2
  • Oki Doki Premium - Monthly$3.991 Month
  • Oki Doki Premium - Yearly$24.991 Year
7 purchases

9Solver AI

Subscriptions7
  • Weekly3 Days trial$5.997 Days
  • Weekly$5.997 Days
  • Monthly$29.991 Month
Show 4 more
  • Monthly3 Days trial$29.991 Month
  • Yearly$69.991 Year
  • Yearly3 Days trial$99.991 Year
  • Premium$99.991 Year

Questions

Is Oki Doki free?
Oki Doki is free to download, with in-app purchases available.
Is 9Solver AI free?
9Solver AI is free to download, with in-app purchases available.
Do Oki Doki or 9Solver AI have ads?
Neither Oki Doki nor 9Solver AI shows ads.
Which is updated more often, Oki Doki or 9Solver AI?
Oki Doki ships an update weekly, and 9Solver AI every 10 days. Most recently, Oki Doki was updated on October 24, 2026 and 9Solver AI on October 24, 2026.

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