InversionLetter vs YOAKE SPACE
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Invert characters
- Rotate text
- Send as image via email
- Change characters
- Tilt and invert options
- Font selection
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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 )
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.
- AI SNS Trend analysis
- Membership ranks and exclusive benefits
- Early event ticket access
- Community trend updates
- View all IRC lineups
- Connect X (Twitter) account
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
| Parameter | InversionLetter | YOAKE SPACE |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 15.0% of reviews | 50.0% of reviews — better |
| Number of ratings | 1 — better | — |
| Update frequency | Every 17 months | Every 2 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 10.3 — better | 16.4 |
| Further details — not scored | ||
| Size | 26 MB | 36 MB |
| Age rating | 4+ | 12+ |
| Developer | EIICHI KOMINE | 株式会社YOAKE entertainment |
Customer experience
InversionLetter
YOAKE SPACE
In-app purchases
InversionLetter
No in-app purchases
YOAKE SPACE
No in-app purchases









