Design Lingo: System Design Live

Name: Design Lingo: System Design
Author: Team inspire

Team inspire1 app · 1.9K installsEducationFreecom.designlingo.app

Crack LLD & system design interviews with 5-min lessons, quizzes and XP.

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Total installs: 1,862
Installs / day: —
Rating: —★
Released: 19 Jan 2026
Last update: 10 Oct 2026
Countries: —

Install history

exact counter from Google Play

30d

Installs per day · last 30 days

Change timeline

No changes recorded yet. We compare every crawl with the previous one and list title, icon, screenshots, description, version, price and availability changes here.

Country availability

Availability has not been checked for this app yet. “Check all countries” looks the app up in about 140 Google Play storefronts and shows where it is live, listed but not installable, or missing — plus any country-specific (custom) store listings.

Top countries

Country data will be available soon.

We estimate where downloads come from using the app’s position in Google Play’s top charts in about 140 countries. This app is not in any chart we have collected yet; the estimate appears as soon as it is.

Top chart positions

Not in any tracked top chart.

Permissions

14 in 4 groups

6 Sensitive3 Notable5 Routine

What this app can do with your phone

Record sound using your phone's microphone
Read photos, videos, and other files saved in your phone's shared storage
Add, change or delete photos, videos and other files in your phone's storage
Show its own windows or bubbles on top of other apps you are using

Photos/Media/FilesSensitive2

Access to photos, videos, music and other files stored on your device

Read photos, videos, and other files saved in your phone's shared storageread the contents of your USB storage · READ_EXTERNAL_STORAGE
Add, change or delete photos, videos and other files in your phone's storagemodify or delete the contents of your USB storage · WRITE_EXTERNAL_STORAGE

StorageSensitive2

Access to files, photos and media saved on your phone's storage

Read photos, videos, and other files saved in your phone's shared storageread the contents of your USB storage · READ_EXTERNAL_STORAGE
Add, change or delete photos, videos and other files in your phone's storagemodify or delete the contents of your USB storage · WRITE_EXTERNAL_STORAGE

MicrophoneSensitive1

Access to your phone's microphone to record sound

Record sound using your phone's microphonerecord audio · RECORD_AUDIO

OtherSensitive9

Access to miscellaneous device features that don't fit other categories

Show its own windows or bubbles on top of other apps you are usingdraw over other apps · SYSTEM_ALERT_WINDOW
Change volume and choose which speaker or headset plays soundchange your audio settings · MODIFY_AUDIO_SETTINGS
Start itself automatically as soon as your phone finishes turning onrun at startup · RECEIVE_BOOT_COMPLETED
Keep your phone's processor or screen from going to sleep, which can use more batteryprevent device from sleeping · WAKE_LOCK
Check whether you are online and whether you use Wi-Fi or mobile dataview network connections · ACCESS_NETWORK_STATE
Connect to the internet to load content and send datafull network access · INTERNET
Make your phone vibratecontrol vibration · VIBRATE
Check with Google Play that you got this app legitimatelyGoogle Play license check · com.android.vending.CHECK_LICENSE
Receive push messages sent from the app's servers over the internetreceive data from Internet · com.google.android.c2dm.permission.RECEIVE

Sensitive = can reach personal data, location, camera/mic or act on your behalf. Notable = changes how your device behaves. Routine = normal for almost every app. Source: Google Play's permission list for all versions of this app.

Store listing

Full description

Preparing for an SDE interview and freezing the moment someone says "design a rate limiter"? Design Lingo turns low-level design and system design into short, playable lessons — the way Duolingo teaches languages. Five minutes on your commute is enough to build real intuition, not memorised answers. BUILT FOR INTERVIEW ROUNDS Every lesson is framed the way interviewers actually ask. Concurrency, caching, sharding, message queues, consistency, rate limiting, API design — explained through the exact scenarios that come up in LLD and HLD rounds at product companies. HOW IT WORKS • Learn a concept in a 3-minute lesson, in plain language • Apply it immediately in an interactive quiz • Read the "Interview Pro Tip" that tells you how to say it out loud in a real round • Keep your streak going and watch your XP climb KEY FEATURES • Bite-sized lessons — real progress in a few minutes a day • Interactive quizzes — active recall beats re-reading notes • Structured learning path — concurrency, synchronisation, async, in the right order • Progress tracking — XP, streaks and a leaderboard to keep you honest • Offline-friendly — download lessons and study on the metro • Dark mode — built for late-night prep WHAT YOU'LL COVER Thread safety and race conditions. Producer-consumer and semaphores. Event loops, promises and non-blocking I/O. Caching strategies. Load balancing. Database sharding and replication. CAP theorem. Rate limiting. Idempotency. Designing for scale. WHO IT'S FOR • Engineers with an interview in the next few weeks • Students and new grads preparing for campus and off-campus SDE roles • Working developers who want to stop nodding along in design reviews No 40-minute videos. No 300-page PDFs. Open the app, learn one thing, close it. Start your first lesson today.

What's new

• New: Daily Three — three system-design questions a day, each with an explainer • Redesigned lessons that reveal one line at a time, with diagrams and code screens • Rebuilt quizzes and code exercises with preview and skip • Smoother onboarding and many polish fixes

Growing in Education

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