Comparison

BugPlanetEra vs Lock&Learn Korean

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

Head to head
About

BugPlanetEra

Features
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[Main function description] - 30+ Languages: Chinese (Taiwan), Chinese (China), Chinese (Hong Kong), Japanese, English (US), English (UK), English (Australia), English (Ireland), English (South Africa), Korean (South Korea), Thai, Indonesia (Indonesia), Hindi (India), Czech, Danish, Dutch (Belgium), Dutch (Netherlands), Finnish, French (Canada), French (France), German, Greek, Hungarian English, Italian, Norwegian, Polish, Portuguese (Brazil), Portuguese (Portugal), Romanian, Slovak, Spanish (Mexico), Spanish (Spain), Swedish, Turkish, Saudi Arabic (Saudi). - Playable content:        · Number: 0 ~ 99.        · Latin alphabet: A ~ Z.        · Scale: Do ~ Si.        · Pattern: 145. - million+ Themes: · Increasing difficulty: Use "single-finger gesture" to swipe up, down, left, and right to increase or decrease the number of cards. · Number of cards: iPhone "2 ~ 60", iPad "2 ~ 140". · Card color: 10 * 10 ( blue, black / white, gray, green, yellow, orange, purple, pink, red ). · Card shape: view, bell, circle, shield, square, hex, heart, skew, rays, slow, time. - Zoom Card: 6 different size card options. - Just listening no watching: You can choose to play only the sound and not show the card content. - Find Words: Words with 145 patterns in 26 languages. - About us: You Can Find the Development team, Trademark, Privacy policy, Terms of use, How to contact us and "subscription management" link. - No Ads. - Support iPhone, iPad. * If you have suggestions or want to report a problem with the App, you are welcome to send a letter to: bugteams@gmail.com or welcome to our Fan page " B.U.G BUS https://reurl.cc/jdodqq ", we will reply you as soon as we receive the letter. * Privacy Policy:https://reurl.cc/xDMOke

About

Lock&Learn Korean

Features
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Walk into the TOPIK already knowing every word on it. Lock&Learn Korean puts real TOPIK vocabulary on your Lock Screen and Home Screen widgets, the screens you already check a hundred times a day. Each word arrives in hangul with its romanization, meaning, and an example sentence you would actually say, so the language settles in through your day instead of in one long sitting. No account. No streak anxiety. Just the language, arriving quietly. HOW IT WORKS - Add the widget to your Lock Screen or Home Screen - A new word appears each time you glance, rotating throughout your day - Tap any word for the full entry: hangul, romanization, meaning, and an example sentence with its translation - Move through the levels at your own pace THE FEED Open the app and keep going: the Learn tab is your deck as a full-screen feed, one card at a time. Tap to flip a card, swipe up for the next word, swipe left to save it, swipe right when you already know it. Every example sentence carries its romanization word by word, right above the hangul. The scroll you reach for anyway, made of vocabulary. QUIZ The Quiz tab deals your words back to back. Word rounds ask what a word means. Sentence rounds blank the word out of a real sentence. Listening rounds ask by ear: nothing to read, just the word spoken aloud. Getting one wrong never affects your progress. Choose whether rounds draw from the words you have met or your whole deck, and set each kind's clock, in Settings. A QUIZ ON YOUR WIDGET, TOO Prefer a challenge before you even unlock? Flip the widget to a question. It shows you the word and asks what it means, then reveals the answer with one tap. A tiny test every time you check your phone. YOUR OWN LISTS Every word carries a save button. Tap it to keep the word, hold it to file the word into a list of your own: travel words, exam words, the ones that keep slipping away. Your lists live in the Library, ready before your trip is. YOUR PROGRESS A Progress screen in the Library counts the words you know and the words you have met, keeps your streaks, and fills one bar per level as you climb. A quiet answer to how it is going, with no dashboard in sight. BUILT ON TOPIK VOCABULARY The word list follows the TOPIK levels, the standard framework for learning Korean, from your very first words up through the vocabulary of dramas, news and the workplace. Level 1 is free forever, the whole first level, no trial and no catch. When you are ready for more, Lock&Learn Korean+ opens every level. MADE TO BE CALM - Notifications are off by default and always opt-in - Your progress stays on your device, no account needed - Save words with a tap, or file them into custom lists of your own - A calm, paper-like design that reads beautifully in light and dark Lock your phone. Learn Korean anyway. Lock&Learn Korean+ is available as a yearly subscription with a 3-day free trial, a monthly subscription, or a one-time lifetime purchase. Payment is charged to your Apple Account. A subscription renews automatically unless canceled at least 24 hours before the end of the current period; manage or cancel it any time in your Apple Account settings. Terms of Use: https://locklearn.xyz/terms.html Privacy Policy: https://locklearn.xyz/privacy.html

Screenshots

BugPlanetEra4 screens
Lock&Learn Korean4 screens

Verdict

The call

The clearest difference is in-app purchases: BugPlanetEra at none against Lock&Learn Korean's 2. BugPlanetEra also leads on device support (3 vs 1) and iOS requirement (13.0 vs 26.5). Lock&Learn Korean's advantage is update cadence (every 3 days vs every 5 months). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Lock&Learn Korean sells 2 in-app purchases, starting at $14.99 per year. BugPlanetEra asks for nothing beyond the download.

UpkeepUpdate frequency

BugPlanetEra ships an update every 5 months, Lock&Learn Korean every 3 days. The most recent releases landed on October 11, 2026 and October 5, 2026 respectively.

Scorecard4 real differences · 2 level
BugPlanetEra versus Lock&Learn Korean: the parameters behind the verdict, then further details
ParameterBugPlanetEraLock&Learn Korean
PriceFreeFree
Update frequencyEvery 5 monthsEvery 3 days — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.0 — better26.5
Further details — not scored
Size2 MB18 MB
Age rating4+4+
DeveloperKhan KaoJeroen Meij

In-app purchases

None

BugPlanetEra

No in-app purchases

2 purchases

Lock&Learn Korean

Subscriptions1
  • Yearly3 Days trial$14.991 Year
One-time1
  • Lifetime Unlock$34.99

Questions

Is BugPlanetEra free?
BugPlanetEra is free to download, with no in-app purchases.
Is Lock&Learn Korean free?
Lock&Learn Korean is free to download, with in-app purchases available.
Do BugPlanetEra or Lock&Learn Korean have ads?
Neither BugPlanetEra nor Lock&Learn Korean shows ads.
Which is updated more often, BugPlanetEra or Lock&Learn Korean?
BugPlanetEra ships an update every 5 months, and Lock&Learn Korean every 3 days. Most recently, BugPlanetEra was updated on October 11, 2026 and Lock&Learn Korean on October 5, 2026.

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