Comparison

Rocket Languages vs iSigner

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

Head to head
About

Rocket Languages

Learn to speak new languages like Spanish, French, and Japanese with structured audio lessons and cultural insights. This app offers lifetime access to courses designed for real conversations, helping you overcome common learning frustrations and speak confidently from day one.

Highlights
  • Structured audio lessons for speaking
  • Lifetime access with free updates
  • Cultural insights and customs
  • Voice recognition for pronunciation
  • Adaptive review activities
  • Interactive audio and conversation practice
Features
Read full description

Rocket Languages - Finally Speak Spanish, French, Japanese & More Learn Spanish, French, Japanese, Italian, German, Korean, Chinese, and more with Rocket Languages - trusted by 2+ million learners worldwide. Unlike game-based apps, Rocket gives you lifetime access to structured lessons that teach you to speak confidently in real conversations. Start your free trial today and see how quickly you’ll go from learning words to actually speaking your new language. WHY ROCKET LANGUAGES WORKS • Speak in real conversations from day 1 – guided audio lessons get you talking fast • Get lifetime access with free updates – your course never expires, and you own it for life • Understand culture, not just grammar – greetings, customs, food, holidays, and everyday life • Perfect your pronunciation – state-of-the-art voice recognition with thousands of native audio examples • Fix weak spots fast – smart review activities adapt to your progress WHAT YOU’LL GET IN EACH LEVEL • 60+ hours of interactive audio lessons you can listen to anywhere — like a podcast, but designed to get you speaking • 60+ hours of Language & Culture lessons that explain the “why,” not just the “what” • Writing practice for Japanese, Korean, Chinese, and other script-based languages • Stress-free conversation practice – train both sides of real dialogues so you’re ready when it counts • Built-in motivational tools to keep you inspired and on track SOLVE THE BIGGEST LANGUAGE LEARNING FRUSTRATIONS • Forgetting what you’ve learned • Memorizing phrases you can’t use in real life • Feeling nervous speaking with locals • Struggling to find time in a busy schedule • Believing you’re too old to learn • Finding other apps unstructured or confusing With Rocket Languages, you’ll remember what you learn, practice until it sticks, and finally speak with confidence. EXTRA BENEFITS YOU WON’T FIND ELSEWHERE • Train your ear – interactive audio sharpens listening skills quickly • Learn how the language actually works – build sentences step by step • Get tailored courses – each one crafted for what’s practical and relevant • Stay motivated – built-in tools keep your learning on track WHY LEARNERS CHOOSE ROCKET LANGUAGES • Proven by millions worldwide • One-time purchase – no ads, no subscriptions • A complete method that teaches speaking, listening, reading, writing, and culture START SPEAKING TODAY Whether it’s for travel, work, or personal growth, Rocket Languages gives you everything you need to finally speak your new language with confidence. • Free trial included – explore the course with no time limit. • Try a set number of lessons for free, then unlock full levels when you’re ready for more. • Additional levels are available as optional in-app purchases, but you’ll always keep free access to your trial lessons. Download Rocket Languages today - start your free trial and begin speaking Spanish, French, Japanese, and more with confidence.

About

iSigner

This app provides the world's first and only comprehensive Shanghai sign language dictionary. It features a vocabulary of 4000 signs derived from extensive video content, influencing sign languages across China and other Asian regions.

Highlights
  • Shanghai sign language dictionary
  • 4000 video signs
  • Influential sign language variant
  • Comprehensive vocabulary
Features
Read full description

1. The first and only app of Shanghai sign language dictionary in the world. 2. iSigner 1.0 is featured with a vocabulary of 4000 Shanghai Sign language ( a variant of Chinese Sign Language) from hundreds of hours of original video, which has exerted great influence on most parts of China, and even the sign languages of Hong Kong, Taiwan, Singapore, Malaysia and other countries and regions.

Screenshots

Rocket Languages4 screens
iSigner4 screens

Verdict

The call

The clearest difference is review sentiment: Rocket Languages at 69% against iSigner's 0%. Rocket Languages also leads on rating (4.6 vs 1.0) and update cadence (every 3 weeks vs every 5 months). iSigner's advantage is iOS requirement (10.0 vs 16.4). On price, ads, in-app purchases and monetization model 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. Rocket Languages sells 49 one-off in-app purchases and iSigner sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Rocket Languages holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: Rocket Languages has 2.4K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 69% of Rocket Languages's written reviews are positive against 0% of iSigner's.

UpkeepUpdate frequency

Rocket Languages ships an update every 3 weeks, iSigner every 5 months. The most recent releases landed on September 24, 2026 and June 1, 2026 respectively.

Scorecard5 real differences · 5 level
Rocket Languages versus iSigner: the parameters behind the verdict, then further details
ParameterRocket LanguagesiSigner
PriceFreeFree
Rating4.6 (2.4K ratings) — better1.0 (2 ratings)
Positive reviews69.2% of reviews — better0.0% of reviews
Number of ratings2.4K — better2
Update frequencyEvery 3 weeks — betterEvery 5 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.410.0 — better
Further details — not scored
Size44 MB27 MB
Age rating4+4+
DeveloperLibros Media Ltd焕 盛

Customer experience

Rocket Languages

All ratings2,398 ratings
Positive91.0%
Neutral3.9%
Negative5.1%
Written reviews389 reviews
Positive69.2%
Neutral11.8%
Negative19.0%

iSigner

All ratings2 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews3 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

Rocket Languages

Reported bugs

5 issues
  • Audio playback issues
  • Inconsistent voice recognition
  • Lesson progress not properly tracked
  • Compatibility problems with newer devices/OS
  • Crashes and freezes during use

Requested features

5 requests
  • Ability to slow down audio playback
  • More grammar and vocabulary review tools
  • Improved search and navigation within the app
  • Customizable learning plans and progress tracking
  • Integration with other language learning resources

iSigner

Not enough reviews yet to summarise bugs or requests.

In-app purchases

49 purchases

Rocket Languages

One-time49
  • Rocket Sign Language Level 1$39.99
  • Rocket Spanish Level 1$59.99
  • Rocket Japanese Level 1$59.99
Show 46 more
  • Rocket Italian Level 1$59.99
  • Rocket Korean Level 1$59.99
  • Rocket Arabic Level 1$59.99
  • Rocket French Level 1$59.99
  • Rocket Portuguese Level 1$59.99
  • Rocket Sign Language Level 1$59.99
  • Rocket Spanish Level 1$89.99
  • Rocket Korean Level 1$89.99
  • Rocket Arabic Level 1$89.99
  • Rocket French Level 1$89.99
  • Rocket German Level 1$89.99
  • Rocket Italian Level 1$89.99
  • Rocket Japanese Level 1$89.99
  • Rocket French Level 1$99.99
  • Rocket Japanese Level 1$99.99
  • Rocket Italian Level 1$99.99
  • Rocket Spanish Level 1$99.99
  • Rocket Spanish Levels 1 & 2$119.99
  • Rocket Spanish Premium: Level 1$149.99
  • Rocket French Premium: Level 1$149.99
  • Rocket German Premium: Level 1$149.99
  • Rocket Italian Premium: Level 1$149.99
  • Rocket Japanese Premium: Level 1$149.99
  • Rocket Chinese Premium: Level 1$149.99
  • Rocket Arabic Premium: Level 1$149.99
  • Rocket Portuguese Premium: Level 1$149.99
  • Rocket Korean Premium: Level 1$149.99
  • Rocket Russian Premium: Level 1$149.99
  • Rocket Spanish Levels 1, 2 & 3$179.99
  • Rocket French Levels 1, 2 & 3$179.99
  • Rocket Japanese Level 1, 2 & 3$179.99
  • Rocket Russian Levels 1, 2 & 3$179.99
  • Rocket German Levels 1, 2 & 3$179.99
  • Rocket Chinese Levels 1, 2 & 3$179.99
  • Rocket Italian Levels 1, 2 & 3$179.99
  • Rocket Spanish Levels 1, 2 & 3$249.99
  • Rocket Japanese Level 1, 2 & 3$249.99
  • Rocket Italian Levels 1, 2 & 3$249.99
  • Rocket German Levels 1, 2 & 3$249.99
  • Rocket Chinese Levels 1, 2 & 3$249.99
  • Rocket Russian Levels 1, 2 & 3$249.99
  • Rocket French Levels 1, 2 & 3$249.99
  • Rocket Japanese Level 1, 2 & 3$259.99
  • Rocket Italian Levels 1, 2 & 3$259.99
  • Rocket Spanish Levels 1, 2 & 3$259.99
  • Rocket French Levels 1, 2 & 3$259.99
1 purchases

iSigner

One-time1
  • 上海手语常用词库$12.99

Questions

Is Rocket Languages free?
Rocket Languages is free to download, with in-app purchases available.
Is iSigner free?
iSigner is free to download, with in-app purchases available.
Which has better reviews, Rocket Languages or iSigner?
Rocket Languages is rated higher. Rocket Languages averages 4.6 out of 5 from 2.4K ratings, while iSigner averages 1.0 from 2 ratings.
Do Rocket Languages or iSigner have ads?
Neither Rocket Languages nor iSigner shows ads.
Which is updated more often, Rocket Languages or iSigner?
Rocket Languages ships an update every 3 weeks, and iSigner every 5 months. Most recently, Rocket Languages was updated on September 24, 2026 and iSigner on June 1, 2026.

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