DoomStudy vs ShadowFlow
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DoomStudy
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Doomstudy transforms your course notes into an addictive, infinite learning feed. Upload your notes and let AI turn them into bite-sized knowledge cards you can scroll through like your favorite social app. WHY DOOMSTUDY? We all spend hours scrolling every day. Doomstudy hijacks that habit and turns it into your secret weapon for acing exams. Same satisfying scroll, different results. KEY FEATURES: - Flexible AI Options : Apple Intelligence Support: Use on-device AI (iOS 26+) for private, fast content generation Multiple AI Models: Choose between Gemini (cloud), Apple Intelligence, or offline models like Llama 3.2, Phi 3.5, and Qwen 2.5 Offline Mode: Download AI models and generate study content anywhere, even without internet File support : PDFs, PPTXs and DOCXs are supported ! - Smart Content Generation : AI-Powered Micro-Learning: Upload PDFs, notes, or any course material and watch AI instantly transform them into digestible cards Infinite Personalized Feed: Never run out of content. AI generates fresh study material from YOUR files on demand Custom Content Types: Choose between facts, key concepts, Q&A format, or true/false questions - Fully Customizable Design : Video Backgrounds: Add dynamic gameplay, nature, ambient, or satisfying video backgrounds to your feed Upload Your Own Videos: Create custom video categories and use your own content Color Customization: Personalize card colors, text colors, and background opacity to match your vibe Your Study Environment: Make it feel like your favorite app - Interactive Learning : Active Recall Quizzes: Test yourself as you scroll with built-in quiz cards that boost retention Custom Study Tags: Organize content by subject, topic, or exam and create personalized feeds Track Your Progress: See how much time you've turned from mindless scrolling into productive learning - Privacy First : Use Apple Intelligence or offline models to keep your study data completely private No internet required with downloaded models Stop wasting your screen time. Start using it. Download Doomstudy and make every scroll count.
ShadowFlow
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ShadowFlow turns YouTube videos into living language lessons. ■ Watch with karaoke subtitles Subtitles highlight word by word in sync with the video, so you never lose your place. Tap any line to jump to that scene. ■ Tap any word you don't know The dictionary opens instantly. Save words with one tap — review them as flashcards, hear the pronunciation, and jump back to the exact scene where each word appeared. ■ Practice speaking with shadowing (MAX) Record your own voice line by line and compare with the original. With headphones, your voice plays in the right ear and the original in the left. Pronunciation scoring shows exactly which words didn't come through, and rhythm bars compare your timing with the original. ■ A shared pool of subtitles (Pro) Subtitles created by users are shared in a pool — once someone transcribes and fixes a video, everyone can learn from it. New subtitles are created on the desktop web version (kotomori.app/shadowflow). ■ Plans - Free: watch subtitles you created, word list - Pro: unlimited access to the shared subtitle pool + folders - MAX: everything in Pro + shadowing practice Available in English, Japanese, Spanish, Simplified Chinese, Korean, French, and German. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the period. Manage or cancel anytime in your App Store account settings. Terms of Use: https://kotomori.app/terms Privacy Policy: https://kotomori.app/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: DoomStudy at none against ShadowFlow's 4. DoomStudy also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads 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
Both are free to download. ShadowFlow sells 4 in-app purchases, starting at $6.99 per month. DoomStudy asks for nothing beyond the download.
DoomStudy ships an update weekly, ShadowFlow every 5 days. Both last shipped on November 5, 2026.
| Parameter | DoomStudy | ShadowFlow |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Weekly | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 90 MB | 6 MB |
| Age rating | 4+ | 17+ |
| Developer | Jalal Fatouaki | Daichi Tanabe |
In-app purchases
DoomStudy
No in-app purchases
ShadowFlow
- ShadowFlow Pro (Monthly)7 Days trial$6.991 Month
- ShadowFlow MAX (Monthly)7 Days trial$14.991 Month
- ShadowFlow Pro (Yearly)7 Days trial$59.991 Year
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- ShadowFlow MAX (Yearly)7 Days trial$129.991 Year









