Comparison

Bói Bài vs OTOTETSU

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

Head to head

★ 4.719 ratingsView app →

About

Bói Bài

Discover daily fortunes and future insights using a standard deck of cards. Explore two divination methods: daily readings and ancestral guidance. Uncover the mysteries held within the cards.

Highlights

Daily fortune telling
Ancestral guidance readings
Card-based divination
Future insights
Mysteries of the cards

Features

Read full description

Bói Bài là ứng dụng xem bói bằng bộ bài tây cực kỳ thú vị. Bạn muốn biết điều gì sẽ xảy ra mỗi ngày? Bạn muốn biết những bí ẩn về bổn mạng, tài lộc của bạn trong tương lai? Hãy khám phá app Bói bài với hai loại bói: Bói ngày và Bói Cửu Huyền Thất Tổ. Nằm trong hệ thống bói Kinh dịch, Bói bài chứa đựng nhiều điều huyền bí ẩn chứa trong các quân bài. Hãy cùng khám phá hàng ngày bạn nhé!

About

OTOTETSU

This app simulates the characteristic sounds of electric trains, generated by inverters controlling motor torque and speed. Users can design sounds for imaginary trains by manipulating waveforms and motor sounds.

Highlights

Simulates electric train acceleration/deceleration sounds
Generates waveforms from inverters
Simulates motor sounds
Design imaginary train sounds
Customize torque and rotational speed effects

Features

Read full description

When electric trains accelerate and decelerate, we can hear some characteristic sounds, which is caused by inverters' controlling the torque and the rotational speed of the motors. This app simulates the waveforms generated by inverters and sounds coming from motors, and you can also design sounds of imaginary trains.

Screenshots

Bói Bài4 screens

OTOTETSU4 screens

Verdict

The call

The clearest difference is review sentiment: OTOTETSU at 93% against Bói Bài's 0%. OTOTETSU also leads on price (Free vs $1.99) and update cadence (every 2 months vs every 85 months). Bói Bài's advantage is iOS requirement (12.0 vs 15.0). On ads, 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

OTOTETSU is free to download; Bói Bài costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Bói Bài ships an update every 85 months, OTOTETSU every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 5 level

Bói Bài versus OTOTETSU: the parameters behind the verdict, then further details
Parameter	Bói Bài	OTOTETSU
Price	$1.99	Free — better
Rating	—	4.7 (19 ratings) — better
Positive reviews	0.0% of reviews	93.1% of reviews — better
Number of ratings	—	19 — better
Update frequency	Every 85 months	Every 2 months — better
Ads	No	No
In-app purchases	No	No
Monetization	Paid	Free — better
Devices	iPhone, iPod	iPhone, iPad, iPod — better
Requires iOS	12.0 — better	15.0
Further details — not scored
Size	49 MB	20 MB
Age rating	4+	4+
Developer	DOTDAC VIET NAM COMPANY LIMITED	Hisato Takeuchi

Customer experience

Bói Bài

Written reviews2 reviews

Positive0.0%

Neutral50.0%

Negative50.0%

OTOTETSU

All ratings17 ratings

Positive94.1%

Neutral5.9%

Negative0.0%

Written reviews58 reviews

Positive93.1%

Neutral3.4%

Negative3.4%

In-app purchases

None

Bói Bài

No in-app purchases

None

OTOTETSU

No in-app purchases

Questions

Is Bói Bài free?

Bói Bài costs $1.99, with no in-app purchases.

Is OTOTETSU free?

OTOTETSU is free to download, with no in-app purchases.

Do Bói Bài or OTOTETSU have ads?

Neither Bói Bài nor OTOTETSU shows ads.

Which is updated more often, Bói Bài or OTOTETSU?

Bói Bài ships an update every 85 months, and OTOTETSU every 2 months. Most recently, Bói Bài was updated on November 1, 2026 and OTOTETSU on November 3, 2026.