OTOTETSU vs PlotTwist Studio
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Simulates electric train acceleration/deceleration sounds
- Generates waveforms from inverters
- Simulates motor sounds
- Design imaginary train sounds
- Customize torque and rotational speed effects
Read full descriptionHide 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.
PlotTwist Studio
Create personalized, AI-generated story adventures for children starring themselves and their friends. Choose genres, settings, characters, and surprise twists, brought to life with professional voice narration and synchronized text highlighting. Stories can be saved offline and are COPPA-compliant with no ads.
- Personalized AI story generation
- Child-controlled story builder
- Professional AI voice narration
- Synchronized text highlighting
- Customizable characters and settings
- Offline story saving
- Multiple child profiles
Read full descriptionHide full description
Every child deserves to be the hero of their own story. PlotTwist creates fully personalized, AI-generated adventures starring your child -- complete with professional voice narration, real friends as characters, and a surprise twist only they choose. No templates. No reruns. Just one-of-a-kind stories, every time. Your Child Builds the Story A fun 7-step story builder puts kids in control. Pick a genre (Silly & Funny? Sci-Fi Adventure? Magical Tale?), choose a setting (Outer Space, Enchanted Castle, Mysterious Forest...), add real people from their life as characters, and even assign them roles -- Best Friend, Sidekick, Villain, or Mysterious Stranger. Add a PlotTwist Every story includes a surprise element chosen by your child -- Time Travel, A Secret Map, A Talking Animal, A Magical Object. This is where the magic really happens. Professional AI Narration High-quality voice narration powered by ElevenLabs brings every story to life. Text highlights in sync as the story plays -- perfect for early readers building that connection between words and sound. Right-Sized for Any Moment Choose Bedtime Quick (~2 min), Just Right (~5 min), or Epic Tale (~10 min) depending on the night. Perfect for bedtime routines, car rides, or quiet time. Read or Listen Voice credits unlock fully narrated stories with read-along highlighting. Text stories let kids read independently -- unlimited, anytime. Save Favorites Offline Stories can be saved and enjoyed without Wi-Fi. Great for travel and no-screen-time-limit moments. Safe. Private. Kid-First. COPPA-compliant. No ads. No third-party tracking. Built-in content safety filters and full parental controls. Your child's privacy is protected -- always. Multiple Child Profiles Each child gets their own profile, story library, and preferences. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: OTOTETSU at none against PlotTwist Studio's 8. OTOTETSU also leads on ratings volume (19 vs 2). PlotTwist Studio's advantage is rating (5.0 vs 4.7). On price, review sentiment, ads 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. PlotTwist Studio sells 8 in-app purchases, starting at $12.99 per month. OTOTETSU asks for nothing beyond the download.
PlotTwist Studio holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: OTOTETSU has 19 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 93% of OTOTETSU's written reviews are positive against 100% of PlotTwist Studio's.
| Parameter | OTOTETSU | PlotTwist Studio |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (19 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 93.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 19 — better | 2 |
| Update frequency | Every 2 months | — |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 20 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | Hisato Takeuchi | Russell Powers |
Customer experience
OTOTETSU
PlotTwist Studio
In-app purchases
OTOTETSU
No in-app purchases
PlotTwist Studio
- PlotTwist Premium Monthly7 Days trial$12.991 Month
- PlotTwist Premium Annual$109.991 Year
- 20 Text Stories$2.99
- 3 Voice Credits$4.99
- 50 Text Stories$4.99
Show 3 moreShow fewer
- 7 Voice Credits$9.99
- 30 Voice Credits$49.99
- 70 voice credits$99.99
![ATOS接近放送[中央線]](https://cdn3.appshunter.io/i/Purple221/4996107af1896a2e5e535b631323dd51/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.png/640x0w.webp "ATOS接近放送[中央線]")
![ATOS接近放送[山手線]](https://cdn3.appshunter.io/i/Purple211/d19010e53546c58c2b003aa93f5e7dbf/AppIcon-0-0-1x_U007emarketing-0-11-0-85-220.png/640x0w.webp "ATOS接近放送[山手線]")
