Comparison

InversionLetter vs YOAKE SPACE

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

Head to head
About

InversionLetter

This app allows users to invert and rotate text messages, then send them as images via email. It offers options to change characters, tilt, and invert text, with various font choices.

Highlights
  • Invert characters
  • Rotate text
  • Send as image via email
  • Change characters
  • Tilt and invert options
  • Font selection
Features
Read full description

You can invert the entered characters , and can rotate. You can send by e-mail as an image . [ Operation ] Q: I want to change the previously entered characters A: Select the character you want change, you can change at each button . ( Tilt and inversion , fonts can be changed )

About

YOAKE SPACE

Enhance your idol support experience with a fan community app. Track your support through AI analysis, earn scores to unlock exclusive benefits like early ticket access, and stay updated on community trends. Connect your social media to boost your idol's visibility.

Highlights
  • AI SNS Trend analysis
  • Membership ranks and exclusive benefits
  • Early event ticket access
  • Community trend updates
  • View all IRC lineups
  • Connect X (Twitter) account
Features
Read full description

All of your Oshi-katsu, in a single app. From recording how you support your Oshi to applying for presale tickets and arriving on event day, YOAKE SPACE supports your Oshi-katsu, your support for your favorite idols, from end to end. ◆ Apply For Presale Tickets Right Here Member presale tickets for events such as IDOL RUNWAY COLLECTION Supported by TGC can now be requested through YOAKE SPACE. Push notifications let you know the moment applications open. ◆ The More You Support, The Earlier You Apply Your supportive posts on X, formerly Twitter, are analyzed by AI and recorded as your score. As your score builds up, your membership rank goes up, and the higher your rank, the sooner the upgrade lottery opens for you. ◆ See What Your Oshi Community Is Talking About Right Now AI ranks trending posts and trending users. Tell at a glance what is gaining attention and who is making an impact. ◆ Find Out How You Support With The Oshi-katsu Type Quiz Answer 14 questions to discover your Oshi-katsu type. Share your result with friends using a share card. ◆ Supported Events IDOL RUNWAY COLLECTION, IRC, Supported by TGC ◆ A Note From The Team This app is used by connecting with your X account, formerly Twitter. Try posting about your Oshi-katsu with #YOAKESPACE and the name of your Oshi. What's New Added support for multiple languages.

Screenshots

InversionLetter1 screens
YOAKE SPACE4 screens

Verdict

The call

The clearest difference is review sentiment: YOAKE SPACE at 50% against InversionLetter's 15%. YOAKE SPACE also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 17 months). InversionLetter's advantage is iOS requirement (10.3 vs 16.4). 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

InversionLetter ships an update every 17 months, YOAKE SPACE every 2 weeks. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

Scorecard5 real differences · 5 level
InversionLetter versus YOAKE SPACE: the parameters behind the verdict, then further details
ParameterInversionLetterYOAKE SPACE
PriceFreeFree
Rating1.0 (1 ratings) — better—
Positive reviews15.0% of reviews50.0% of reviews — better
Number of ratings1 — better—
Update frequencyEvery 17 monthsEvery 2 weeks — better
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supportedFree — better
DevicesiPhone, iPod — betteriPhone
Requires iOS10.3 — better16.4
Further details — not scored
Size26 MB36 MB
Age rating4+12+
DeveloperEIICHI KOMINE株式会社YOAKE entertainment

Customer experience

InversionLetter

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews20 reviews
Positive15.0%
Neutral5.0%
Negative80.0%

YOAKE SPACE

Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

InversionLetter

No in-app purchases

None

YOAKE SPACE

No in-app purchases

Questions

Is InversionLetter free?
InversionLetter is free to download, with no in-app purchases.
Is YOAKE SPACE free?
YOAKE SPACE is free to download, with no in-app purchases.
Do InversionLetter or YOAKE SPACE have ads?
InversionLetter shows ads; YOAKE SPACE does not.
Which is updated more often, InversionLetter or YOAKE SPACE?
InversionLetter ships an update every 17 months, and YOAKE SPACE every 2 weeks. Most recently, InversionLetter was updated on November 1, 2026 and YOAKE SPACE on October 30, 2026.

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