Comparison

Certisep vs LinDuo

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

Head to head
About

Certisep

Features
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Con Certisep podrás firmar electrónicamente los certificados y títulos electrónicos XML requeridos por la SEP para los módulos MEC y MET de una manera fácil y segura. Con Certisep no necesitas compartir tu e.firma con terceros para el firmado digital de documentos, ya que el firmado se realiza desde tu propio dispositivo y el proceso es reforzado con el uso de tecnologías de validación de rostro para evitar el mal uso de tu e.firma. Certisep siempre te notificará sobre el uso de tu firma electrónica para el firmado de los certificados y títulos electrónicos.

About

LinDuo

Learn Russian vocabulary with short, engaging lessons. Features native speaker pronunciation, visual aids, and a built-in dictionary. Practice with games and custom lessons designed for quick daily study.

Highlights
  • Native speaker pronunciation
  • 2375 words in 180 topic lessons
  • Offline access
  • Illustrations and phonetic transcriptions
  • Customizable lessons
  • Progress tracking dictionary
  • True or False review game
Features
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ADVANTAGES OF OUR APP: * Pronunciation by a native speaker * 2375 words split into 180 topic lessons * Does not require permanent Internet connection * Beautiful illustrations for each word * Phonetic transcription for each word * Dark interface to study at night * Choose from male and female voice * Built in app dictionary with progress * Game "True or False" to review pas material * Special lessons with favorite, difficult, old, random words * Flexible sound settings (music, speaker, effects) * Just 10-15 minutes per day to learn all words * For adults and teens 13+ Only 10-15 minutes per day - Spending just 10-15 minutes every day, will easily allow you to remember all useful Russian words. While memorizing words, the frequency of lesson is more important than duration of each lesson. 10 minutes on each day of the week will be more productive than one hour of tuition a week. One minute lessons - Taking into account busyness of modern life, we designed each lesson in the way so it would never take more than one minute to complete it! So you no longer need to search for free time to practice Russian! Simply, once you get a chance, launch the app and do one lesson at a time =) Short sessions will not affect efficiency of word memorization. Only useful Russian words - Russian for Beginners: LinDuo HD is a free and quick start to learn Russian language! Unlike others, we have only the most useful words, which are divided into 180 topic based lessons. Quality is here! Teach-yourself Russian is designed, that it will use your visual and echoic memory to help you memorize Russian words fast and easy! Special illustrations - We use only specially developed infographics (developed by psychologists), so your eyes can quickly identify meaning of word or action without stressing them with small unnecessary details. Word pronunciation by native speakers - Our app will help you master pronunciation of Russian words! Each word is recording by professional native speaker! Additionally, in the settings you can choose between male or female voice. Dynamic lesson difficulty - The app changes lesson difficulty gradually as you progress. To achieve this, it keeps stats for EVERY word! Example: in the spelling mode, initially you need to insert several missing letters in a word, then create a word having extra letters and finally, when you are ready, you will need to type the entire word on the keyboard. Modes for quick learning - The App includes four additional lesson types which are made of Favorites, Difficult, Old, Random words. You can add any word to your favorites and later create custom lesson from your Favorite words. Words are automatically added to "Difficult" (the ones you struggle to memorize) and "Old" sections. A "Random" mode will create a unique lesson. Do not need to know how to read - If you cannot read yet, no problem! Each word has a transcription in your language! And for more experienced ones, in the settings, you can choose a phonetic (like in a dictionary) transcription. Additional features - Thanks to your reviews, we are constantly updating the app to make it better! To help you take care of your eyesight, with just one tap, you can activate dark theme. If you temporarily do not have internet access, no problem! The App can work offline as well! Review Past Material - Many good apps do not pay enough attention to review past material! For this purpose we created the word game "True or False". It is very simple, but it's addictive and the most importantly, it helps to repeat past material and never to forget it! Support and Contact Us If you have any questions or suggestions, please never hesitate to send us an email admin@lin-duo.com - or use in-app contact form. We are always happy to answer your questions! Thank you very much for your trust and choice! If you like our app, do not forget to share it with your friends in social networks.

Screenshots

Certisep4 screens
LinDuo4 screens

Verdict

The call

The clearest difference is in-app purchases: Certisep at none against LinDuo's 4. Certisep also leads on update cadence (every 2 months vs every 6 months). LinDuo's advantage is iOS requirement (11.0 vs 18.7). On price, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. LinDuo sells 4 one-off in-app purchases. Certisep asks for nothing beyond the download.

UpkeepUpdate frequency

Certisep ships an update every 2 months, LinDuo every 6 months. The most recent releases landed on October 29, 2026 and November 3, 2026 respectively.

Scorecard3 real differences · 7 level
Certisep versus LinDuo: the parameters behind the verdict, then further details
ParameterCertisepLinDuo
PriceFreeFree
Rating—4.7 (20 ratings) — better
Positive reviews—85.7% of reviews
Number of ratings—20 — better
Update frequencyEvery 2 months — betterEvery 6 months
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.711.0 — better
Further details — not scored
Size114 MB278 MB
Age rating4+4+
DeveloperIngenieria Estrategia y Comunicacion en Internet, SCVitali Simsive

In-app purchases

None

Certisep

No in-app purchases

4 purchases

LinDuo

One-time4
  • Work Offline!$0.99
  • Unlimited Energy!$4.99
  • All Inclusive!$9.99
Show 1 more
  • Help the Project!$29.99

Questions

Is Certisep free?
Certisep is free to download, with no in-app purchases.
Is LinDuo free?
LinDuo is free to download, with in-app purchases available.
Do Certisep or LinDuo have ads?
Neither Certisep nor LinDuo shows ads.
Which is updated more often, Certisep or LinDuo?
Certisep ships an update every 2 months, and LinDuo every 6 months. Most recently, Certisep was updated on October 29, 2026 and LinDuo on November 3, 2026.

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