Comparison

Sumi vs Zeronoon

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

Zeronoon

Features
Read full description

Zeronoon is your ultimate productivity workspace, bringing together task management, notes, and more in a seamless, user-friendly app. Designed to help you stay organized and focused, Zeronoon empowers you to take control of your day and reach your goals, whether you’re a solo user or part of a team. Features: - Task Management: Easily create, organize, and prioritize tasks. Notes & Checklists: Capture ideas on the go and create quick checklists to track essential details. Timer Functionality: Use the built-in timer to stay focused and manage work sessions. Seamless Sync Across Devices: Access Zeronoon across all your devices ensuring you’re always connected and organized wherever you go. Why Choose Zeronoon? Zeronoon combines powerful productivity tools with an intuitive design that makes organization effortless. With Zeronoon, you’ll stay organized, focused, and in control of your day-to-day tasks and long-term goals. Whether you’re tracking personal habits or managing team projects, Zeronoon is built to support you every step of the way. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula Privacy Policy: https://zeronoon.com/privacy-policy

Screenshots

Sumi4 screens
Zeronoon4 screens

Verdict

The call

The clearest difference is update cadence: Sumi at every 5 days against Zeronoon's fortnightly. Zeronoon's advantage is device support (3 vs 1) and iOS requirement (14.0.0 vs 16.0). On price, 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 Zeronoon sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Sumi ships an update every 5 days, Zeronoon fortnightly. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 7 level
Sumi versus Zeronoon: the parameters behind the verdict, then further details
ParameterSumiZeronoon
PriceFreeFree
Rating3.0 (2 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 5 days — betterFortnightly
AdsNoNo
In-app purchasesYesYes
MonetizationFree—
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS16.014.0.0 — better
Further details — not scored
Size10 MB58 MB
Age rating4+4+
DeveloperDavid ParkZERONOON LIMITED

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
2 purchases

Zeronoon

Subscriptions2
  • Zeronoon Pro Monthly$4.991 Month
  • ZeronoonPro Premium Yearly$47.491 Year

Questions

Is Sumi free?
Sumi is free to download, with in-app purchases available.
Is Zeronoon free?
Zeronoon is free to download, with in-app purchases available.
Do Sumi or Zeronoon have ads?
Neither Sumi nor Zeronoon shows ads.
Which is updated more often, Sumi or Zeronoon?
Sumi ships an update every 5 days, and Zeronoon fortnightly. Most recently, Sumi was updated on November 3, 2026 and Zeronoon on October 30, 2026.

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