Comparison

OTOGE trainer vs Calc

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

Head to head
About

OTOGE trainer

Features
Read full description

OTOGE trainer is a rhythm game training app for iOS. Record yourself playing using the "Screen Recording" function of iOS. You can use that video to repeatedly practice the songs you have difficulty with. The features have been kept to a minimum in order to make it "easy" and "comfortable" to use. Features - Versatile UI, compatible with any game - UI that does not interfere with practice - Easy operation for AB repeat, slow playback, and moving the playback position - No advertisements Caution This application does not compress the size of the video because it is designed to be used and discarded after the song has been played. The screen recording videos take up storage space, so please delete them when you are done with them. (You should also delete them from “Recently Deleted Items” to free up storage space.) FAQ Q. How can I get videos for practice? A. Record a video of the game you want to practice on your iPhone/iPad. Q. How do I record? A. Activate the "Screen Recording" function from the Control Center to record Q. I can't find the "Screen Recording" button in the Control Center. A. Go to "Settings" > "Control Center" to add a control Supported Models - iPhone with iOS 17.0 or later - iPadOS 17.0 or later iPad

About

Calc

This app adds a fun, interactive calculator experience with cute character reactions and customizable designs. It also features a unique 'Performance Mode' for playing music and hidden 'SP Answer Actions' for special character responses.

Highlights
  • Cute character reactions with button presses
  • Customizable calculator themes
  • Performance Mode for music playback
  • Hidden SP Answer Actions
  • Paid character DLCs available
  • Voice lines for each character
Features
Read full description

A little more joy in your calculations, every day. Desktop Mate now has a sister app! Calculator - Desktop Mate Widgets is a digital calculator you can use with your favorite characters — and the first release in the new Desktop Mate Widgets series. ■ Enjoy Cute Character Reactions Every time you press a calculator button, the character will speak that number and strike a pose. Press "=" to get the answer — though sometimes they might struggle a little to figure it out! Pet or poke the character's head for special reactions too. Enjoy your favorite character's movements and expressions as you calculate. ■ Customize with Character-Themed Designs Swap out the calculator buttons and background to match your character's style. Each character comes with multiple design options, so you can mix and match to suit your mood or the moment. ■ Performance Mode: Play Music on Your Calculator! Tap the music note button to switch from calculator mode to Performance Mode. The calculator keys function like piano keys, and the character will sing along to whatever you press. Hold "+" or "-" to shift notes by a semitone, and multi-key presses are supported too. With a little practice, you might be able to pull off a real performance! Share your session on social media and enjoy it with everyone. ■ SP Answer Actions: Find the Hidden Numbers Certain calculation results trigger special character reactions. From a triple "777" to fun number combinations, each character also has their own unique numbers that set off a special response. See how many hidden reactions you can find! ■ Ready to Use Right Away: Aieru-tan Launch the app and you're ready to go with Aieru-tan, the official mascot character of infiniteloop. Aieru-tan is a 16-year-old high school student who works part-time at infiniteloop. She loves programming and gaming, and her occasionally sharp tongue is all part of her charm. Since her debut in 2012, she has appeared in Desktop Mate and many other projects as a beloved face of infiniteloop. ■ More Character DLCs for a More Personal Experience This app also offers paid additional character DLC. The "Hatsune Miku DLC" will be available at launch, with more characters to be added over time in step with the Desktop Mate series lineup. Each DLC features newly recorded voice lines tailored to each character, so you can enjoy your favorite character's voice and reactions every time you use the calculator. More characters will be added over time, in line with the Desktop Mate series lineup. And this is just the beginning — more Desktop Mate Widgets apps are on the way. Stay tuned! Note: When using additional character DLC, please also review the guidelines set by each character's rights holder.

Screenshots

OTOGE trainer2 screens
Calc4 screens

Verdict

The call

The clearest difference is in-app purchases: OTOGE trainer at none against Calc's 11. OTOGE trainer also leads on update cadence (daily vs weekly). Calc's advantage is device support (4 vs 2) and iOS requirement (15.0 vs 17.0). On price and ads 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. Calc sells 11 one-off in-app purchases. OTOGE trainer asks for nothing beyond the download.

UpkeepUpdate frequency

OTOGE trainer ships an update daily, Calc weekly. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

Scorecard4 real differences · 6 level
OTOGE trainer versus Calc: the parameters behind the verdict, then further details
ParameterOTOGE trainerCalc
PriceFreeFree
Rating—4.1 (49 ratings) — better
Positive reviews—77.9% of reviews
Number of ratings—49 — better
Update frequencyDaily — betterWeekly
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod, Mac — better
Requires iOS17.015.0 — better
Further details — not scored
Size3 MB156 MB
Age rating4+4+
Developerflow LLCインフィニットループ

In-app purchases

None

OTOGE trainer

No in-app purchases

11 purchases

Calc

One-time11
  • Kasane Teto$2.99
  • Zundamon$2.99
  • Koharu Rikka$2.99
Show 8 more
  • Natsuki Karin$2.99
  • Hanakuma Chifuyu$2.99
  • Additional Character MEIKO$2.99
  • Additional Character KAITO$2.99
  • Additional Character Kagamine Rin$2.99
  • Additional Character Kagamine Len$2.99
  • Additional Character Megurine Luka$2.99
  • Additional Character Hatsune Miku$2.99

Questions

Is OTOGE trainer free?
OTOGE trainer is free to download, with no in-app purchases.
Is Calc free?
Calc is free to download, with in-app purchases available.
Do OTOGE trainer or Calc have ads?
Neither OTOGE trainer nor Calc shows ads.
Which is updated more often, OTOGE trainer or Calc?
OTOGE trainer ships an update daily, and Calc weekly. Most recently, OTOGE trainer was updated on October 25, 2026 and Calc on October 28, 2026.

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