Sumi vs DEApp
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sumi
This app helps you reduce phone usage by setting timers for breaks. It alerts you if you touch or move your device during the break, aiming to boost productivity and mental well-being.
- Timed phone breaks
- Movement alerts
- Productivity enhancement
- Mental health improvement
- Simple interface
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The most beautiful thing an app can do is get out of your way. Sumi sits quietly on cream paper, holds your attention for an hour, and asks for nothing back. Set a length. Put your phone face down. Pick it up before the time is done and the session breaks — not as a punishment, but as a commitment kept. No ads. No notifications. No streaks-as-slot-machines. No weekly subscription trap. Just deep work, and the quiet record of the hours you've given it. — THE RITUAL — Set an intention and a length. Put the phone down. Sumi keeps watch: lift it, or leave the app, and the session ends. When the time is held, the line completes, your lifetime hours grow, and the session is logged. Silent while you work. Quietly rewarding when you finish. — A CALM LEDGER, NOT A GAME — The number that only goes up: your lifetime hours focused. A streak, if you want one. A week that fills, a line that climbs. No characters to feed, no points, no dark patterns. Progress you can feel, with nothing engineered to hook you. — MADE FOR DEEP-WORK PEOPLE — For writers, developers, designers, students of a craft — anyone who already romanticizes focus and resents apps built to fracture it. Graphite and cream. Monospace. Paper grain. A single calligraphic mark. — PAY ONCE — Your focus shouldn't be a recurring charge. Sumi is free to use, with an optional one-time Lifetime unlock (or a subscription, if you prefer) for custom lengths, full history and trends, themes, and session intentions. Put the phone down. Pick the work up. ——— Privacy Policy: https://dayonefoundry.com/sumi/privacy Terms of Use (EULA): https://dayonefoundry.com/sumi/terms
DEApp
This app helps users break smartphone addiction and boost productivity by locking selected applications. Set schedules or timers for app usage, with features to prevent deletion or installation of new apps during lock periods.
- Scheduled app locking
- Timer-based app locking
- Deletion prevention
- Installation prevention
- Customizable lock schedules
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Easy and simple, but unbreakable app lock application! Want to break free from smartphone addiction? Want to boost productivity in your life? Just set the apps and times you want to lock. DEApp will support your willpower. Scheduled Lock Apps lock according to the scheduled time. You can set it to repeat on specific days. Timer Apps lock for the set amount of time. Deletion Prevention You cannot delete the app during the lock period. Installation Prevention You cannot install new apps during the lock period.
Screenshots
Verdict
The clearest difference is review sentiment: DEApp at 62% against Sumi's 0%. DEApp also leads on rating (4.5 vs 3.0) and ratings volume (8 vs 2). Sumi's advantage is monetization model (free vs free with in-app purchases). On price, update cadence, ads and in-app purchases 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. Sumi sells 3 in-app purchases, starting at $5.99 per month and DEApp sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
DEApp holds the better App Store score, 4.5 against 3.0. Both are backed by a comparable volume of ratings — 2 and 8 respectively. Written reviews point the same way: 0% of Sumi's written reviews are positive against 62% of DEApp's.
Both ship on a similar rhythm, roughly every 5 days. Both last shipped on September 20, 2026.
| Parameter | Sumi | DEApp |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) | 4.5 (8 ratings) — better |
| Positive reviews | 0.0% of reviews | 62.1% of reviews — better |
| Number of ratings | 2 | 8 — better |
| Update frequency | Every 5 days | Every 5 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 16.0 | 16.0 |
| Further details — not scored | ||
| Size | 10 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | David Park | UnCheon Baek |
Customer experience
Sumi
DEApp
In-app purchases
Sumi
- Sumi Pro Monthly$5.991 Month
- Sumi Pro Annual7 Days trial$24.991 Year
- Sumi Pro Lifetime$49.99
DEApp
- Unlock Apps$0.99









