Comparison

AWS DEA vs Nihongo Chat

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

Head to head
About

AWS DEA

Features
Read full description

Glue, Redshift, Kinesis, Athena — the Data Engineer Associate exam walks the whole path your data takes through AWS. Certisimo walks it with you, question by question. WHAT'S INSIDE • 260 exam-style questions across 4 practice sets, written for the AWS Data Engineer Associate exam • The ground you will train on: AWS Glue, Redshift, Kinesis, Athena, S3 and Lake Formation TWO WAYS TO PRACTICE In training mode, answers come back with immediate feedback. In test mode you face the clock — timed, scored, no hints — and finish with a full review of what you skipped or got wrong. MEASURE YOUR PROGRESS Insights turns your history into a readiness score, so how close you are to a passing level is always visible. MADE FOR HOW YOU STUDY • Save questions, add your own notes, find anything with search • Full session history, so you can watch your scores climb • Works completely offline — study on the plane, the metro, anywhere • iPhone and iPad, light and dark, no account and no sign-up ALREADY BOUGHT THIS APP? Premium is yours — free, forever. It unlocks by itself the first time you open this update: nothing to buy, nothing to restore, no account to create. Your saved questions, your notes and your full history are all still here. GO FURTHER WITH PREMIUM Certisimo Premium unlocks the full explanation behind every answer — why the right choice wins, not just which letter it was — plus unlimited exam simulations, the complete Insights breakdown (weak, hard, new and strong questions) and an ad-free experience. • Weekly $5.99 · Yearly $34.99 with a 14-day free trial · Lifetime $79.99 one-time purchase Get Certisimo today — and make the Data Engineer exam the least surprising part of your certification. Certisimo is an independent study aid and is not affiliated with, endorsed by, or sponsored by Amazon Web Services, Inc. Weekly and Yearly Premium are auto-renewable subscriptions; Lifetime is a one-time purchase. Subscriptions automatically renew unless cancelled at least 24 hours before the end of the current period. Payment is charged to your Apple ID account, and you can manage or cancel your subscription in your App Store account settings at any time. Terms of Use: https://certisimo-app.web.app/terms Privacy Policy: https://certisimo-app.web.app/privacy

About

Nihongo Chat

Master Japanese vocabulary and grammar for all JLPT levels with a spaced repetition system. Build custom decks from a comprehensive dictionary and track your learning progress with daily check-ins and review calendars. Enjoy a privacy-focused, offline experience.

Highlights
  • Spaced Repetition System (SRS)
  • JLPT Level Selection (N5-N1)
  • Built-in Japanese Dictionary
  • Custom Deck Building
  • Daily Reminders & Streaks
  • Offline Functionality
  • Multiple-Choice Quiz Mode
Features
Read full description

Study Japanese vocabulary and grammar at any JLPT level — N5 through N1 — with spaced repetition that brings each word back just before you'd forget it. FREE TO START, AND FREE WHERE IT COUNTS 61 cards are yours immediately — 10 to 15 at every level — with no account, no time limit and no ads. The full 214,000-entry Japanese dictionary is free too: look anything up, any time, without hitting a paywall. PICK YOUR LEVEL Choose N5, N4, N3, N2 or N1 and study only that level. No advanced grammar thrown at a beginner, no basics slowing down an advanced learner. Switch whenever you're ready. 11,008 CARDS ACROSS FIVE LEVELS N1 4,262 · N2 2,593 · N3 1,954 · N4 1,202 · N5 997. Of those, 1,621 are hand-written cards carrying a usage note and two example sentences each — the N1 vocabulary and every level's grammar patterns. The rest are dictionary-verified word entries, 753 of which now carry an example sentence as well. STUDY THE WAY MEMORY ACTUALLY WORKS Grade each card Again, Hard, Good or Easy and the scheduler sets your next review. Every button shows you exactly when that card comes back, before you press it. Swipe right to move on, left to go back and re-read a card you have already graded. Set your session length right on the study screen, so ten free minutes is ten minutes of work instead of a wall of four hundred reviews. KNOW WHERE YOU ACTUALLY STAND The Stats tab reads your own review history and names the one thing most worth fixing — showing up, clearing your backlog, how much is sticking, or the balance between vocabulary and grammar — with the numbers behind it, and a projected finish date for your level at your current pace. No invented percentiles. No comparison against users who don't exist. BUILD YOUR OWN DECK Look up any word in the bundled dictionary and add it as a card. Edit any card in the app, including the built-in ones, and revert to the original whenever you like without losing your review history. Adding and editing one card at a time is always free. Filter your library down to just the cards you added, or just the ones you starred, and study only those. QUIZ, FILL IN THE BLANK, AND LISTEN Multiple-choice quizzes test recall under time pressure. Fill in the blank takes one word out of a real sentence and asks you to put it back. Tap any Japanese word or sentence to hear it read aloud, or let each card read itself as it arrives. ON IPHONE AND IPAD One app, both devices. On iPad the type and the layout are built for the larger screen rather than stretched to fit, the library grows from two columns to five, and it works in landscape. BACK UP FOR FREE Export your progress and your own cards at any time, at no cost. Your work is yours. ONE OPTIONAL UNLOCK A single one-time purchase opens the whole library — every card at every level — plus bulk import of your own word lists from CSV. Not a subscription. Nothing expires and nothing recurs. PRIVACY Everything runs on your device. No account, no login, no analytics, nothing transmitted anywhere. Dictionary data derived from JMdict, a project of the Electronic Dictionary Research and Development Group, used under their licence. Nihongo Chat is an independent study tool, not affiliated with or endorsed by the Japan Foundation or Japan Educational Exchanges and Services, administrators of the JLPT.

Screenshots

AWS DEA4 screens
Nihongo Chat4 screens

Verdict

The call

The clearest difference is ads: Nihongo Chat at none against AWS DEA's shown. Nihongo Chat also leads on update cadence (daily vs every 5 months) and iOS requirement (17.0 vs 26.0). On price, in-app purchases 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. AWS DEA sells 3 in-app purchases, starting at $5.99 per 7 days and Nihongo Chat sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

AWS DEA ships an update every 5 months, Nihongo Chat daily. The most recent releases landed on November 9, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 6 level
AWS DEA versus Nihongo Chat: the parameters behind the verdict, then further details
ParameterAWS DEANihongo Chat
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 5 monthsDaily — better
AdsYesNo — better
In-app purchasesYesYes
Monetization—Paid
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.017.0 — better
Further details — not scored
Size54 MB112 MB
Age rating4+4+
DeveloperSPIDER SERVICE SRLTak Yan

In-app purchases

3 purchases

AWS DEA

Subscriptions2
  • Premium Weekly$5.997 Days
  • Premium Yearly14 Days trial$34.991 Year
One-time1
  • Premium Lifetime$79.99
1 purchases

Nihongo Chat

One-time1
  • Full Library Unlock$29.99

Questions

Is AWS DEA free?
AWS DEA is free to download, with in-app purchases available.
Is Nihongo Chat free?
Nihongo Chat is free to download, with in-app purchases available.
Do AWS DEA or Nihongo Chat have ads?
AWS DEA shows ads; Nihongo Chat does not.
Which is updated more often, AWS DEA or Nihongo Chat?
AWS DEA ships an update every 5 months, and Nihongo Chat daily. Most recently, AWS DEA was updated on November 9, 2026 and Nihongo Chat on October 31, 2026.

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