Comparison

Sumi vs DEApp

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Timed phone breaks
  • Movement alerts
  • Productivity enhancement
  • Mental health improvement
  • Simple interface
Features
Read full description

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

About

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.

Highlights
  • Scheduled app locking
  • Timer-based app locking
  • Deletion prevention
  • Installation prevention
  • Customizable lock schedules
Features
Read full description

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

Sumi4 screens
DEApp3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 5 days. Both last shipped on September 20, 2026.

Scorecard4 real differences · 6 level
Sumi versus DEApp: the parameters behind the verdict, then further details
ParameterSumiDEApp
PriceFreeFree
Rating3.0 (2 ratings)4.5 (8 ratings) — better
Positive reviews0.0% of reviews62.1% of reviews — better
Number of ratings28 — better
Update frequencyEvery 5 daysEvery 5 days
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhoneiPhone, iPad — better
Requires iOS16.016.0
Further details — not scored
Size10 MB7 MB
Age rating4+4+
DeveloperDavid ParkUnCheon Baek

Customer experience

Sumi

All ratings2 ratings
Positive0.0%
Neutral100.0%
Negative0.0%
Written reviews2 reviews
Positive0.0%
Neutral100.0%
Negative0.0%

DEApp

All ratings8 ratings
Positive87.5%
Neutral0.0%
Negative12.5%
Written reviews29 reviews
Positive62.1%
Neutral20.7%
Negative17.2%

In-app purchases

3 purchases

Sumi

Subscriptions2
  • Sumi Pro Monthly$5.991 Month
  • Sumi Pro Annual7 Days trial$24.991 Year
One-time1
  • Sumi Pro Lifetime$49.99
1 purchases

DEApp

One-time1
  • Unlock Apps$0.99

Questions

Is Sumi free?
Sumi is free to download, with in-app purchases available.
Is DEApp free?
DEApp is free to download, with in-app purchases available.
Which has better reviews, Sumi or DEApp?
DEApp is rated higher. Sumi averages 3.0 out of 5 from 2 ratings, while DEApp averages 4.5 from 8 ratings.
Do Sumi or DEApp have ads?
Neither Sumi nor DEApp shows ads.
Which is updated more often, Sumi or DEApp?
Sumi ships an update every 5 days, and DEApp every 5 days. Most recently, Sumi was updated on September 20, 2026 and DEApp on September 20, 2026.

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