LingualShift vs Duostories
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LingualShift
Instantly convert text between slang and formal language in over 50 languages using AI. Perfect for professional communication or casual content, it helps you sound natural or professional as needed. Offers unlimited translations and advanced features with a subscription.
- Slang to formal translation
- Formal to slang translation
- Supports 50+ languages
- AI-powered text conversion
- Unlimited translations (Pro)
- Custom glossary
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LingualShift instantly shifts your words to fit any moment — slang to formal, formal to slang, or any context you need — in 50+ languages, powered by AI. WHETHER YOU’RE WRITING AN EMAIL OR A TEXT: Sound professional when you need to. Sound natural when you want to. LingualShift reads the tone of your text and converts it in seconds. SLANG TO FORMAL: Turn “yo wats good, u coming tmr?” into “Good morning, I hope you are well. Will you be joining us tomorrow?” Perfect for job applications, business emails, and professional communication. FORMAL TO SLANG: Make corporate language human again. Great for social media, texting, and casual content. CONTEXT SHIFT: Rewrite any text for the exact situation — Professional Email, Academic, Legal, Explain to a Patient, ELI5, Marketing, Diplomatic, Direct & Concise, Customer Support, or Job Interview. Pick a context and LingualShift reshapes your words to fit. SUMMARIZE: Paste any text and get the gist, key points, and why they matter — instantly. Pro members can upload a PDF for a full document summary. SLANG OF THE WEEK: Add the LingualShift widget to your Home Screen and see a new slang term every Monday, with its meaning and real examples. 50+ LANGUAGES: English, Spanish, French, German, Japanese, Chinese, Korean, Arabic, Hindi, Portuguese, Italian, Russian, Turkish, Dutch, Polish, Swedish, and many more — choose your output language for Translate, Context Shift, and Summarize. PRO FEATURES: Unlimited Translate, Context Shift, and Summarize every day Listen to any result spoken aloud Full history with search and favorites Upload PDFs for summarization Custom Glossary — teach LingualShift your preferred terms, applied automatically to every translation Guaranteed access, even during high-demand periods PRIVACY FIRST: Sign in with Apple. Your text is processed by AI and never stored by third parties. Delete your account and all data at any time from Settings. SUBSCRIPTION INFO: Free: 5 actions per day, shared across Translate, Context Shift, and Summarize Pro: $3.99/month, with a 7-day free trial for new subscribers Payment charged to Apple ID. Subscriptions renew unless cancelled 24+ hours before period end. Manage subscriptions in App Store account settings. Privacy Policy: https://lingualshift.com/privacy.html Terms of Use: https://lingualshift.com/terms.html
Duostories
Enhance language skills by reading interactive stories and answering comprehension questions. Access over 2,800 stories in more than 70 languages, covering a wide range of language types. This independent project offers an engaging alternative to traditional language drills.
- Read 2,800+ interactive stories
- Explore 70+ languages
- Practice comprehension with questions
- Discover diverse language types
- Learn through focused reading
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Read stories. Answer questions. Improve your language skills. Duostories helps you build reading comprehension through interactive stories and short in-story questions. Explore more than 2,800 stories in 70+ languages across 90 courses, and practice in a format that feels more engaging than drills alone. Read Duolingo stories in more languages with translations created by the Duostories community. Duostories uses Duolingo story content under license. It is an independent project and not an official Duolingo product. Features: - Read 2,800+ interactive stories - Explore 70+ languages across 90 courses - Practice comprehension with built-in questions in every story - Discover major, minority, endangered, and constructed languages - Learn through reading in a simple, focused format
Screenshots
Verdict
The clearest difference is in-app purchases: Duostories at none against LingualShift's 3. Duostories also leads on update cadence (fortnightly vs every 5 weeks) and ratings volume (5 vs 1). On price, rating, 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. LingualShift sells 3 in-app purchases, starting at $2.99 per 7 days. Duostories asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for LingualShift against 5.0 for Duostories. That said, the two scores are not equally well evidenced: Duostories has 5 ratings behind it against 1, so its average is the more settled of the two.
LingualShift ships an update every 5 weeks, Duostories fortnightly. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.
| Parameter | LingualShift | Duostories |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (5 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 5 — better |
| Update frequency | Every 5 weeks | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.4 | 16.4 |
| Further details — not scored | ||
| Size | 40 MB | 52 MB |
| Age rating | 4+ | 4+ |
| Developer | CRISTIAN BARRON | Richard Gerum |
Customer experience
LingualShift
Duostories
In-app purchases
LingualShift
- LingualShift Pro$2.997 Days
- LingualShift Pro7 Days trial$3.991 Month
- LingualShift Pro7 Days trial$49.991 Year
Duostories
No in-app purchases









