Trancy vs Peptide Library
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Trancy
Transform your favorite YouTube videos and podcasts into interactive language lessons. This app uses AI to provide bilingual subtitles, instant translations, and speaking practice with pronunciation feedback. Learn over 10 languages through real-world content.
- AI bilingual subtitles
- Instant word translation
- Speaking practice with AI evaluation
- Summaries of video content
- Sync YouTube subscriptions
- Support for 10+ languages
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Learn a language from the YouTube videos and podcasts you already love. Trancy adds AI dual subtitles to what you watch and listen to. Tap any word to translate it, practice line by line, get your pronunciation scored, and talk with an AI tutor. Every word you save becomes part of your own knowledge base, built from real content. DUAL SUBTITLES, EVERY LINE CLEAR • See the original and the translation together on YouTube videos • No subtitles? AI generates them for videos and podcasts • Follow your favorite channels in the app and learn from every new upload PODCASTS, NOW WITH SUBTITLES • AI turns podcasts into bilingual transcripts • Read along as you listen, and catch every word you missed TAP ANY WORD, KEEP WATCHING • Definitions, phonetics and pronunciation appear instantly • AI explains meaning and usage in context • Save new words and great sentences in one tap YOUR OWN LANGUAGE KNOWLEDGE BASE • Every word and sentence you save comes from videos and podcasts you actually watched • Saved words are highlighted the next time they appear in a video, a podcast or a lookup • Your collection grows with expressions you really met, not lists someone else picked INTENSIVE LISTENING AND SHADOWING • Line-by-line listening: playback pauses after each sentence, with loop and blind listening • Shadowing with AI pronunciation scores that point out the words you missed • Adjustable speed, so you can train your ear from slow to native pace FLASHCARDS THAT STICK • Example sentences are the exact lines you heard, so every word keeps its context • Spaced repetition reminds you right before you forget • Hear the original sentence read aloud while you review SPEAK WITH AN AI TUTOR • Role-play real situations: shopping, work, travel and more • Practice speaking anytime, without the pressure A LITTLE PROGRESS EVERY DAY • Daily goals, streaks and study time • Designed for iPhone, iPad and iPhone Duo WHY LEARNERS CHOOSE TRANCY • Learn from content you love instead of dull textbooks • 11 languages to learn, including English, Spanish, Japanese, Korean and French • Trusted by 600,000 learners SUPPORT Questions? Visit https://www.trancy.org/chat Terms of Service: https://manual.trancy.org/en/legal/terms-of-service Privacy Policy: https://manual.trancy.org/en/legal/privacy-policy
Peptide Library
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Peptide Library helps you track your peptide Cycle and research peptides and compounds in one place. Track your Cycle See what's scheduled today, record completed items, check your week, and use the calendar to look ahead or review what you've tracked. Build your Stack Add the compounds you're tracking, organize your schedule, set reminders, and keep your current Cycle in one place. Follow your progress Set goals, add measurements, and follow changes over time. Track weight and other measurable goals, along with check-ins for sleep, recovery, skin, and energy. Research peptides & compounds Explore an editorial library covering peptides and related compounds, with research context, safety information, administration information where supported, and source-backed references. Made for personal tracking Your Stack, amounts, schedules, goals, and measurements are entered by you. Peptide Library does not recommend compounds, combinations, dosages, or treatment protocols. Peptide Library is intended for educational and personal tracking purposes. It is not medical advice and is not a substitute for advice, diagnosis, or treatment from a qualified healthcare professional.
Screenshots
Verdict
The clearest difference is in-app purchases: Peptide Library at none against Trancy's 4. Peptide Library also leads on update cadence (every 5 days vs monthly). Trancy's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 18.0). On price 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
Both are free to download. Trancy sells 4 in-app purchases, starting at $3.99 per month. Peptide Library asks for nothing beyond the download.
Trancy ships an update monthly, Peptide Library every 5 days. The most recent releases landed on November 12, 2026 and October 31, 2026 respectively.
| Parameter | Trancy | Peptide Library |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (238 ratings) — better | — |
| Positive reviews | 69.4% of reviews | — |
| Number of ratings | 238 — better | — |
| Update frequency | Monthly | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 54 MB | 16 MB |
| Age rating | +4 | 4+ |
| Developer | L2D LIMITED | Jay Park |
Bugs and requests
Trancy
Reported bugs
20 issues- Crashing after update
- Crashing on iPad
- Crashing when going full screen
- Crashing after purchase
- Crashing on 'My' page
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- Subtitles not working
- YouTube subtitles extraction failed
- AI subtitles formatting incorrect
- Safari browser not working
- Cannot close subtitles in full screen on iPad
- Netflix subtitles sometimes freeze
- Sharing to app not working on iOS
- Mandatory portrait mode on iPad
- Cannot use horizontally on iPad
- Cannot use in landscape mode on iPad
- iPad app is just a scaled-up iPhone app
- Videos with Japanese audio play Japanese
- AI translation errors
- AI talk dialogue recognition rate low
- Paid member experiencing crashes
Requested features
17 requests- Repeat playback function
- Background playback
- Larger font size option
- White background option
- Persian/Farsi language support
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- Support for VisionOS
- Connect to podcast app
- Arabic language support
- Add more speed levels
- Implement segmentation feature on mobile
- Offline video saving
- Reverse 3-second function
- Multiple word book selections
- Spaced repetition practice for vocabulary
- Copy AI definition
- Connect to OpenAI for translation
- Whole sentence transcription with pronunciation
Peptide Library
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Trancy
- Trancy monthly3 Days trial$3.991 Month
- Trancy Premium + AI 月订3 Days trial$8.991 Month
- Trancy Premium - Yearly7 Days trial$33.491 Year
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- Trancy Premium + AI 年定7 Days trial$74.991 Year
Peptide Library
No in-app purchases









