Comparison

MotiSpi vs bayes_lab

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

Head to head
About

MotiSpi

This app offers an engaging way to improve English speaking skills through unlimited AI conversations. It analyzes your speech, provides personalized feedback, and offers a vast library of scenarios and vocabulary to help you become fluent.

Highlights
  • Unlimited AI conversation practice
  • AI speech analysis and feedback
  • Personalized word and phrasebook
  • Extensive scenario coverage (2000+ scenes)
  • Support for all skill levels
  • 英検® secondary interview practice
  • Visualized learning progress
Features
Read full description

"Teacher, listen to what happened today." Imagine having a conversation partner who is always ready to listen, patient when you search for words, and genuinely excited when you realize, "I actually said it." ■ Talk about anything with your teachers Choose a teacher with their own distinct personality and start speaking out loud right away. There is no need to book sessions in advance. Chat about your daily life, your favorite movies, or places you want to visit. Teachers remember what you talked about before, so you can pick up right where you left off. They automatically adjust their speaking speed to your level. If you are just starting out, you can begin with a single short sentence. When learning Japanese, your teacher Nathan speaks Japanese with you. ■ Natural real-time corrections Based on what you just said, your teacher shows you a more natural way to put it. You receive clear translations and spoken audio, letting you practice saying the phrase again right away. ■ Put your phone down with Hands-free mode Turn on Hands-free mode in your settings, set your phone on your desk, and just talk. You do not need to press or hold the microphone button while speaking. Tap the microphone icon whenever you want to mute. This feature is turned off by default. ■ Practice real-world role-plays Step into realistic situations such as ordering food at a cafe while traveling or handling workplace discussions. You can listen to sample conversations first to build confidence before practicing with your teacher. ■ Adventure quizzes and audio review When you cannot talk out loud, such as on a train, jump into Adventure. Learn useful phrases through quizzes with pictures and audio. Save expressions to your phrase book, review weak or forgotten phrases, or launch a quiz battle directly from your saved list. Autoplay phrases across 7 speed settings from 0.5x to 3.0x, with background playback that continues even when your screen is locked. Check your progress with talk history, analysis, and a speaking level check, while dressing up your favorite characters. ■ Courses for English speakers Learn Japanese, Korean, Chinese (Mandarin), Spanish, French, or German across dedicated courses: - Japanese: Everyday Life, Business, Travel, Study Abroad, Kids, JLPT - Korean: Everyday Life, Business, Travel, Study Abroad, Kids, TOPIK - Chinese: Everyday Life, Business, Travel, Study Abroad, Kids, HSK, AP Chinese - Spanish: Everyday Life, Business, Travel, Study Abroad, Kids, DELE, AP Spanish - French: Everyday Life, Business, Travel, Study Abroad, Kids, DELF/DALF, TEF/TCF Canada - German: Everyday Life, Business, Travel, Study Abroad, Kids, Goethe-Zertifikat ■ Sister app integration MotiSpi is made by Astran in Tokyo. The same account works in our sister vocabulary app, MotiTan: build words there, then say them out loud here. ■ Free to start MotiSpi is free to start. Some features include paid plans as well as usage and time limits. A Family plan is available, allowing parents to manage settings such as their child's use of the message board. Terms of Use https://motitown.com/notification/document/legal-privacy/riyokiyaku/motispi Privacy Policy https://motitown.com/notification/document/legal-privacy/motispi AP is a trademark registered by the College Board, which is not affiliated with, and does not endorse, this app.

About

bayes_lab

Features
Read full description

むずかしい数式なしで「ベイズ統計」を学び、あなたのデータ(CSV)でそのまま確かめられる、学習・実験アプリです。 ■ はじめてでも迷わない「基礎ガイド」 ベイズって何? → 公式の意味 → 何に使える? → 応用、と段階的に学べます。 ■ 学ぶ(学習図鑑) ・ベイズ統計/事前分布・事後分布 ・ポアソン分布/Gamma-Poissonモデル ・Beta-Binomialモデル/A・B比較/3群以上の比較 ・正規分布・Student-t分布/ロバスト推定 ・過分散/負の二項分布/ゼロ過剰ポアソン/情報のある事前分布 図とやさしい言葉、具体例つきで解説します。 ■ 試す(実験) CSVを読み込むと、列名から解析タイプを自動で判定します。 ・成功率・不良率(Beta-Binomial):真の成功率の範囲を推定 ・A/B・多群比較:どちらが良いかを「確率」で判定 ・件数データ(Gamma-Poisson):過分散・ゼロ過剰も自動チェックし、次回の予測まで ・連続値の比較:平均差・95%信用区間。外れ値に強いロバスト推定も併記 結果は確率と幅で日本語解説。出てきた用語はワンタップで学習図鑑へ。 ■ 残す・共有する ・解析結果の履歴保存/検索/タグ付け ・PDFレポート出力 ・過去の実績を事前分布に取り込んで再解析 ■ 確認する(クイズ) 初級・中級・高度のレベル別で、理解度をチェックできます。 すべて端末内で完結します。アカウント登録もネット接続も不要で、データは一切収集しません。 ※ 本アプリは教育・検証用です。医療・法務・金融など高リスクな最終判断にそのまま使わないでください。実務導入時は、モデルの妥当性・データ品質・監査ログ・レポート再現性をご確認ください。

Screenshots

MotiSpi4 screens
bayes_lab4 screens

Verdict

The call

The clearest difference is in-app purchases: bayes_lab at none against MotiSpi's 11. bayes_lab also leads on ads (none vs shown) and update cadence (daily vs weekly). MotiSpi's advantage is iOS requirement (15.0 vs 26.4). On price 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. MotiSpi sells 11 in-app purchases, starting at $22.99 per month. bayes_lab asks for nothing beyond the download.

UpkeepUpdate frequency

MotiSpi ships an update weekly, bayes_lab daily. The most recent releases landed on October 21, 2026 and October 16, 2026 respectively.

Scorecard4 real differences · 6 level
MotiSpi versus bayes_lab: the parameters behind the verdict, then further details
ParameterMotiSpibayes_lab
PriceFreeFree
Rating4.8 (25 ratings) — better—
Positive reviews55.2% of reviews—
Number of ratings25 — better—
Update frequencyWeeklyDaily — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.0 — better26.4
Further details — not scored
Size415 MB3 MB
Age rating4+4+
DeveloperAstran Inc.BeeKnowledgeDesign,Inc.

In-app purchases

11 purchases

MotiSpi

Subscriptions5
  • 1ヶ月プラン$22.991 Month
  • 12ヶ月プラン(キャンペーン)3 Days trial$129.991 Year
  • 12ヶ月プラン$179.991 Year
Show 2 more
  • ファミリープラン$199.991 Year
  • ファミリープラン(キャンペーン)3 Days trial$199.991 Year
One-time6
  • モチベイト原石×1$0.99
  • モチベイト原石×6$3.99
  • モチベイト原石×12$5.99
Show 3 more
  • モチベイト原石×30$12.99
  • モチベイト原石×60$24.99
  • モチベイト原石×85$29.99
None

bayes_lab

No in-app purchases

Questions

Is MotiSpi free?
MotiSpi is free to download, with in-app purchases available.
Is bayes_lab free?
bayes_lab is free to download, with no in-app purchases.
Do MotiSpi or bayes_lab have ads?
MotiSpi shows ads; bayes_lab does not.
Which is updated more often, MotiSpi or bayes_lab?
MotiSpi ships an update weekly, and bayes_lab daily. Most recently, MotiSpi was updated on October 21, 2026 and bayes_lab on October 16, 2026.

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