Acta vs Sumbi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Acta
This app helps you achieve large goals by breaking them down into manageable daily tasks. It uses AI to create a personalized plan with milestones and simple daily actions, focusing on a calm and pressure-free user experience.
- AI-driven goal planning
- Milestone tracking on a timeline
- Daily task management
- Four tracking methods (completion, accumulation, measurement, journaling)
- Calm, full-screen interface
- On-device data storage
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Turn a goal into small steps you can take today. Tell Acta what you want to achieve. A short AI conversation helps you build a plan with milestones and daily actions. Review and edit the plan before starting. Record completed actions, quantities, measurements and short journal entries. Look back through your calendar, use timers and reminders, and keep notes with each goal. Start with up to 3 active goals for free, including everyday tracking and 20 AI coaching replies each week. Ask about a barrier or think through your next step from the sparkle button on Today. Acta Pro lets you start more active goals and includes 200 shared AI replies each week across coaching, plan adjustments, reflections and next-goal preparation. Review suggested changes before applying them. Existing goals and records remain available when Pro ends. Your goals and records are saved on your device. When you use AI, relevant goal, record, memo and conversation context is sent to the AI service to answer your request. Subscriptions renew automatically unless cancelled at least 24 hours before the current period ends. Manage them in your Apple Account settings. A separate one-time lifetime purchase is also available. Terms: https://devyan0.github.io/legal/acta/terms.html Privacy: https://devyan0.github.io/legal/acta/privacy.html
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 monetization model: Sumbi at free against Acta's freemium. On price, review sentiment, update cadence 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. Acta sells 2 in-app purchases, starting at $8.99 per month and Sumbi sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Acta ships an update every 10 days, Sumbi weekly. The most recent releases landed on October 8, 2026 and October 29, 2026 respectively.
| Parameter | Acta | Sumbi |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 10 days | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Free — better |
| Devices | iPhone | iPhone |
| Requires iOS | 17.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 28 MB | 94 MB |
| Age rating | 4+ | 4+ |
| Developer | 승현 양 | 나이스데이 |
Customer experience
Acta
Sumbi
In-app purchases
Acta
- Acta Pro Monthly$8.991 Month
- Acta Pro Annual7 Days trial$39.991 Year
Sumbi
- Shallow Sea Creature$0.99
- Deep Sea Creature$1.99
- Abyssal Creature$2.99









