Comparison

100ls vs LetzFly Ground School

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

Head to head
About

100ls

Features
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100LS helps you train English listening with real podcasts, synced subtitles, sentence replay, and bilingual translation. No flashcards. No drills. Just real audio, one sentence at a time. 100 Days Language Study Learn English through real podcasts. No flashcards, no drills. Learn English the way you actually use it. 100LS is built for learners who are past the basics and ready to train their ear on real, unscripted English. Pick a podcast episode you're curious about, hit play, and let the content do the teaching. Synchronized subtitles highlight word-for-word as audio plays. Tap any line to jump back and replay it. Toggle your native language translation on or off. Slow it down to catch every word, or speed it up to push your comprehension. Repeat until it clicks. Features Synced Subtitles Every word lands on screen exactly when it's spoken. Tap any subtitle line to jump to that moment in the audio β€” no scrubbing, no guessing. Native Language Translation Powered by Apple's on-device translation engine. Works offline. Toggle translations on when you need context, off when you want the challenge. Automatic Transcription No subtitles for an episode? 100LS generates them automatically using on-device speech recognition, then syncs them to the cloud so they load instantly next time. Variable Playback Speed 0.75x for close listening. 1x for natural pace. 1.25x–2x for review. One tap to cycle through. Learning Analytics Track your daily listening time and streaks. Small numbers add up β€” 20 minutes a day compounds fast. Who it's for You've studied English. You can read it fine. But listening to native speakers still feels like catching every third word. 100LS is for that gap β€” the one between knowing the language and actually hearing it. Requirements iOS 17.0 or later. Translation requires iOS 18.0 β€” language models download once on first use. Privacy Policy: https://socratop.com/privacy User Terms: https://socratop.com/terms

About

LetzFly Ground School

Features
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Practice for your EASA PPL(A) theory exams and learn about different topics. This app allows you to learn, take mock tests, save questions, track your stats and examine your mistakes in order to prepare you for the exams. (This is not validated or endorsed by EASA or FIs and may contain inaccuracies and errors. Use it together with the official learning materials, not instead of them.)

Screenshots

100ls4 screens
LetzFly Ground School4 screens

Verdict

The call

The clearest difference is update cadence: LetzFly Ground School at every 5 days against 100ls's fortnightly. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. 100ls sells 3 in-app purchases, starting at $4.99 per month and LetzFly Ground School sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

100ls ships an update fortnightly, LetzFly Ground School every 5 days. Both last shipped on October 31, 2026.

Scorecard1 real difference Β· 5 level
100ls versus LetzFly Ground School: the parameters behind the verdict, then further details
Parameter100lsLetzFly Ground School
PriceFreeFree
Update frequencyFortnightlyEvery 5 days β€” better
AdsNoNo
In-app purchasesYesYes
DevicesiPhoneiPhone, iPad β€” better
Requires iOS18.017.0 β€” better
Further details β€” not scored
Size15 MB188 MB
Age rating12+4+
DeveloperSocratop TechNeatCapital OU

In-app purchases

3 purchases

100ls

Subscriptions2
  • 100ls plus monthly1 Month trial$4.991 Month
  • 100ls plus yearly7 Days trial$39.991 Year
One-time1
  • 100ls η»ˆθΊ«δΌšε‘˜$39.99
10 purchases

LetzFly Ground School

One-time10
  • Air Law$5.99
  • Aircraft General Knowledge$5.99
  • Flight Performance and Planning$5.99
Show 7 more
  • Human Performance$5.99
  • Meteorology$5.99
  • Navigation$5.99
  • Operational Procedures$5.99
  • Principles of Flight$5.99
  • Communications$5.99
  • Unlock All Topics$29.99

Questions

Is 100ls free?
100ls is free to download, with in-app purchases available.
Is LetzFly Ground School free?
LetzFly Ground School is free to download, with in-app purchases available.
Do 100ls or LetzFly Ground School have ads?
Neither 100ls nor LetzFly Ground School shows ads.
Which is updated more often, 100ls or LetzFly Ground School?
100ls ships an update fortnightly, and LetzFly Ground School every 5 days. Most recently, 100ls was updated on October 31, 2026 and LetzFly Ground School on October 31, 2026.

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