RSI STAR vs Sumbi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RSI STAR
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RSI STAR is a remote simultaneous interpretation platform that can be used for online, on-site, or hybrid events by connecting interpreters remotely. Audiences in events or meetings can download this application on their smartphone, easily listen to the interpreted audio of the language they want, and read AI-recognized and AI-translated subtitles. Interpreters can interpret remotely without going to the event venue, and audiences can listen to the interpreted audio at the venue or anywhere in the world. We provide the best interpretation service using this application with our professional interpreters in each industry. The main features of this application are remote simultaneous interpretation, AI-recognized subtitles of venue audio, live AI-translated subtitles using Microsoft's features, and live chat service among audiences. There is no limit to the number of languages used for interpretation, and it can be compatible with various video conferencing platforms such as Zoom, Webex, and Teams. Plus, a relay simultaneous interpreting feature is also included. RSI STAR is developed by Communistar Co., Ltd. for the sustainable and growing MICE industry.
Sumbi
This app encourages users to spend less time on their phones by gamifying digital detox. Users engage in timed "dives" away from their devices, earning virtual sea creatures based on their focus duration. It offers a peaceful, non-punitive approach to building healthier digital habits.
- Timed phone-free dives
- Unlock virtual sea creatures
- Personalized ocean environment
- Buddy dive feature
- Night sea creatures
- Diary-like dive log
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The longer you put your phone down, the deeper your life gets. Start the timer, set your phone down, and sea creatures come to your ocean. From exam prep to digital detox, dive with Sumbi. Sumbi is a study focus timer and digital detox app named after the "sumbisori," the whistling breath of Jeju haenyeo, Korea's legendary free-diving women. Start a dive when you want time away from your phone. While your phone rests, your ocean deepens, and sea creatures come to live in it. Who dives with Sumbi - Students who need a study timer for exams and deep focus - Anyone fighting phone addiction or doomscrolling - People who want to cut screen time and rebuild concentration - ADHD brains that need a gentle, visual reason to stay off the phone - Anyone who just wants to watch a calm ocean and breathe What makes Sumbi different 1. One dive = one focus session. Keep your phone down while the timer runs, and the dive succeeds. If you fail, nobody scolds you. 2. Your focus time becomes an ocean. Successful dives bring creatures from shallow water, deep water, even the abyss. 3. Collect and raise your sea creatures. The more you dive, the wider and deeper your ocean grows. 4. Gift creatures to your dive buddies. Focus is deeper together. 5. No ads, no noise. Sumbi never drags you back with notifications. Coming back is your choice. Study timer, pomodoro, or deep work Pick any length with the dial: a short pomodoro-style session or hours of exam prep. Every dive adds to your daily focus record. When haenyeo divers surface, they release a long whistling breath: "hooo-ee." Your day deserves a breath that deep. Have a good dive. Hoo-ee! Contact: sumbi@niceday.io
Screenshots
Verdict
The clearest difference is in-app purchases: RSI STAR at none against Sumbi's 3. RSI STAR also leads on device support (3 vs 1) and iOS requirement (12.0 vs 16.4). Sumbi's advantage is update cadence (weekly vs every 2 months). 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
Both are free to download. Sumbi sells 3 one-off in-app purchases. RSI STAR asks for nothing beyond the download.
RSI STAR ships an update every 2 months, Sumbi weekly. The most recent releases landed on November 3, 2026 and November 6, 2026 respectively.
| Parameter | RSI STAR | Sumbi |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 38 MB | 94 MB |
| Age rating | 4+ | 4+ |
| Developer | Akkadu (Beijing) Technology Co., Ltd. | 나이스데이 |
In-app purchases
RSI STAR
No in-app purchases
Sumbi
- Shallow Sea Creature$0.99
- Deep Sea Creature$1.99
- Abyssal Creature$2.99









