Comparison

Satori Reader vs Numbiro Premium

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

Head to head
About

Satori Reader

Enhance your Japanese reading and listening skills with engaging stories written by native speakers. Features adaptive kanji, smart definitions, and spaced repetition to build vocabulary. Get clarity with friendly annotations and human feedback.

Highlights
  • Compelling stories by native speakers
  • Audio narration by voice actors
  • Adaptive kanji presentation
  • Smart word definitions
  • Friendly annotations
  • Spaced repetition vocabulary review
  • Human feedback and support
Features
Read full description

Ready to take your Japanese reading and listening comprehension to the next level? Welcome to Satori Reader. COMPELLING STORIES Read from a growing library of engrossing stories written by native speakers for intermediate students, across genres such as fantasy, slice-of-life, thrillers, documentaries, news, and more. AUDIO Tap any sentence to hear it read aloud by native voice actors (no robots!). ADAPTIVE KANJI USAGE Crack the chicken-and-egg problem of reading kanji with our unique presentation engine, which adjusts the Japanese text to accommodate your actual knowledge. This allows you to challenge yourself for the kanji you should know without being overwhelmed by what you don't. SMART DEFINITIONS Tap any word for a definition. This is more than just an automated lookup. Satori Reader shows the actual sense of each word as it's being used in the sentence. For example, the particle の has many uses: it can indicate possession; it can turn the preceding verb or phrase into a noun; it can stand in for another word; and more. We show you exactly what is happening in every instance of every word. FRIENDLY ANNOTATIONS Gray underlines indicate longer annotations that break down tricky expressions, provide cultural background, or help you to read between the lines. Our editors work hard to anticipate what might be confusing and proactively help you to make sense of things. Good-bye, confusion. Hello, clarity! SPACED REPETITION SYSTEM (SRS) The built-in spaced repetition review system helps you to build your vocabulary. Create review cards instantly as you read. Each card you create takes along a snapshot of the sentence in which you encountered the word, further helping to cement it in your memory. You can even play back the audio of that sentence while reviewing the word! HUMAN FEEDBACK Still confused about something? Just ask in the discussion section below each episode. Our team of friendly human beings is ready to help. Satori Reader is built by a team that cares. Our goal is to bring satori (enlightenment) into your Japanese reading life. Set up a free account today, and let's get started. SUBSCRIPTION DETAILS ▪ OPTIONS: Download the app for free and enjoy unlimited access to the first two episodes of each series (new series released regularly), plus complete access to special series such as Closeup: Obon Society. Subscribed for unlimited access to the entire Satori Reader library of more than 1200 episodes (new episodes released each week), including crystal-clear audio, helpful annotations, and real human feedback. Try your first month FREE (limit one per customer; cannot be used in combination with other introductory offers; offers subject to change). ▪ EXTRAS: Your subscription to Satori Reader comes with complimentary web access, as well as access to Satori Reader on all your smartphones and tablets. ▪ PRIVACY POLICY: https://www.satorireader.com/privacy ▪ TERMS OF SERVICE: https://www.satorireader.com/terms ADDITIONAL SUBSCRIPTION DETAILS ▪ Payment will be charged to your iTunes Account at confirmation of purchase (following any trial period). ▪ Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. ▪ Account will be charged for renewal within 24 hours prior to the end of the current period, and identify the cost of the renewal. ▪ Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. ▪ Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. ▪ Cancel your subscription at any time. If you cancel, you will retain full access to Satori Reader for the period you paid for and you will not be billed again. If you have any questions, write to support@satorireader.com for speedy assistance. Thank you for your business!

About

Numbiro Premium

Practice recognizing spoken Japanese numbers in everyday conversation. Choose number ranges from single digits to billions and test your skills with Japanese counters. The premium version offers an ad-free experience and advanced features.

Highlights
  • Listen to spoken Japanese numbers
  • Identify numbers in conversation
  • Select custom number ranges
  • Practice Japanese counters
  • Timed challenges
  • Preset management
Features
Read full description

Learning to say numbers is one thing. Understanding them in real conversation is another. With Numbiro, you listen to numbers spoken in one of 29 languages and identify what you hear. Practice anything from single digits to millions or even billions, and improve your speed and accuracy under pressure. Japanese learners can also practice counters, with 20 included in the free version. Challenge yourself to see how many answers you can get right in one minute. Supported languages include Arabic, Brazilian Portuguese, Cantonese, Catalan, Czech, Danish, Dutch, English, Finnish, French, German, Hindi, Icelandic, Italian, Japanese, Korean, Mandarin, Norwegian, Polish, Portuguese, Romanian, Russian, Spanish, Swedish, Turkish and Welsh. Numbiro is ad-supported. Premium removes ads and unlocks additional features, including preset management and advanced Japanese counters, available with either a one-time purchase or subscription.

Screenshots

Satori Reader4 screens
Numbiro Premium4 screens

Verdict

The call

The clearest difference is price: Satori Reader at Free against Numbiro Premium's $1.99. Satori Reader also leads on rating (4.8 vs 4.0) and ratings volume (218 vs 2). Numbiro Premium's advantage is in-app purchases (none vs 8) and iOS requirement (13.0 vs 15.0). On update cadence, 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

Satori Reader is free to download; Numbiro Premium costs $1.99 up front. Satori Reader sells 3 in-app purchases, starting at $8.99 per month. Numbiro Premium asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Satori Reader holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Satori Reader has 218 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 90% of Satori Reader's written reviews are positive against 67% of Numbiro Premium's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 25, 2026 and October 23, 2026 respectively.

Scorecard7 real differences · 3 level
Satori Reader versus Numbiro Premium: the parameters behind the verdict, then further details
ParameterSatori ReaderNumbiro Premium
PriceFree — better$1.99
Rating4.8 (218 ratings) — better4.0 (2 ratings)
Positive reviews90.2% of reviews — better66.7% of reviews
Number of ratings218 — better2
Update frequencyEvery 3 monthsEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size81 MB68 MB
Age rating12+4+
DeveloperBrak Software, Inc.Sulisoft Limited

Customer experience

Satori Reader

All ratings217 ratings
Positive94.9%
Neutral2.3%
Negative2.8%
Written reviews174 reviews
Positive90.2%
Neutral2.3%
Negative7.5%

Numbiro Premium

All ratings2 ratings
Positive50.0%
Neutral50.0%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral33.3%
Negative0.0%

Bugs and requests

Satori Reader

Reported bugs

2 issues
  • Login issues and account creation problems
  • Syncing and loading delays on some devices

Requested features

4 requests
  • Dark mode option
  • Ability to loop audio playback
  • Kanji lookup/learning tools integration
  • More advanced/diverse content selection

Numbiro Premium

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Satori Reader

Subscriptions3
  • Satori Reader Monthly1 Month trial4 variants$8.991 Month
  • Satori Reader Annual1 Month trial$89.991 Year
  • Satori Reader Annual1 Year trial3 variants$89.991 Year
None

Numbiro Premium

No in-app purchases

Questions

Is Satori Reader free?
Satori Reader is free to download, with in-app purchases available.
Is Numbiro Premium free?
Numbiro Premium costs $1.99, with no in-app purchases.
Which has better reviews, Satori Reader or Numbiro Premium?
Satori Reader is rated higher. Satori Reader averages 4.8 out of 5 from 218 ratings, while Numbiro Premium averages 4.0 from 2 ratings.
Do Satori Reader or Numbiro Premium have ads?
Neither Satori Reader nor Numbiro Premium shows ads.
Which is updated more often, Satori Reader or Numbiro Premium?
Satori Reader ships an update every 3 months, and Numbiro Premium every 3 months. Most recently, Satori Reader was updated on October 25, 2026 and Numbiro Premium on October 23, 2026.

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