When'd I: iPhone vs Android
When'd I gets 100+ downloads a day worldwide (AppInsider estimate, October 2026, rounded down to a band).
When'd I by HyunWoo Lee is on both the App Store and Google Play. Here are both versions together: downloads, users, revenue, ratings and chart positions, store by store with totals.
Productivity PaidWhen'd I at a glance
AI summary written from our chart and store data, 2026-10-24. It can be wrong: check the numbers above.
A privacy-focused productivity tool for users who prefer tracking the last occurrence of recurring tasks over managing traditional to-do lists. The app currently holds the #1 spot in the Taiwan Paid Productivity charts and ranks #15 in South Korea, indicating strong regional traction despite a low overall rating count.
Similar apps: Habitica, Streaks, Loop Habit Tracker
App Store
App details
App privacy Measured
When'd I declares it collects no data at all — the rarest and most private label on the App Store.
As declared by the developer on the App Store — Apple requires every app to publish this label. We track changes over time.
Google Play
App details
When'd I downloads & installs
Both stores, worldwide. Bands are open; exact numbers are free with an account.
| Store | Downloads / day | Lifetime installs |
|---|---|---|
| iPhone | 100+ | 500+ |
| Google Play | 1+ | 100+ Measured |
| Total | 100+ Confidence | 1k+ Confidence |
How this is calculated
Where When'd I's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Where it ranks now
Both stores, across every country we track.
Ratings
Both stores. Store data, measured.
| Store | Rating | Ratings |
|---|---|---|
| App Store | 1.0 ★ | 1 |
| Google Play | – | – |
| Both stores | 1.0 ★ weighted by ratings | 1 |
What users say about When'd I
From recent reviews.
About When'd I
"When did I last wash the sheets?"
"When did I change the water filter?"
"When did I last call my parents?"
Some things you can never remember. When'd I records just the date you did them.
No goals, no nagging notifications, no checklists. Tap once and it's logged as today.
■ See how long it's been
Every item shows the days since you last did it.
The longer it's been, the more it stands out.
■ A timeline where distance means time
The space between dots is the actual gap between dates.
Busy stretches look dense. The months you skipped show up as empty space.
■ Photos and notes
Attach one photo and a short note to any record.
■ Widgets and Lock Screen
Check what's overdue from your Home Screen, and log without opening the app.
You can even record straight from the Lock Screen. (iOS 16.4+)
■ An optional evening nudge
Once a day, if you want it. Off by default.
■ Entirely on your device
No account, no server, no ads. Your records stay on your phone.
Export and import backup files yourself, and an automatic iCloud copy
brings everything back if you switch phones or reinstall.
■ Buy once
One purchase unlocks everything. No in-app purchases, no subscriptions, no ads.
When'd I iPhone
When'd I gets 100+ downloads a day worldwide (AppInsider estimate, October 2026, rounded down to a band).
When'd I is #1 in Productivity Paid in Taiwan and charting in 2 of 30 countries we track.
Updated 25 Oct 2026 · rankings refresh through the day
24 Sep 2026 Productivity PaidWhen'd I at a glance
AI summary written from our chart and store data, 2026-10-24. It can be wrong: check the numbers above.
A privacy-focused productivity tool for users who prefer tracking the last occurrence of recurring tasks over managing traditional to-do lists. The app currently holds the #1 spot in the Taiwan Paid Productivity charts and ranks #15 in South Korea, indicating strong regional traction despite a low overall rating count.
Similar apps: Habitica, Streaks, Loop Habit Tracker
When'd I on the App Store
App details
App privacy Measured
When'd I declares it collects no data at all — the rarest and most private label on the App Store.
As declared by the developer on the App Store — Apple requires every app to publish this label. We track changes over time.
When'd I downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Where When'd I's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Taiwan | ProductivityPaid | #1 |
| South Korea | ProductivityPaid | #6 |
| Taiwan | All AppsPaid | #60 |
| South Korea | All AppsPaid | #179 |
Apps near When'd I on the chart
Productivity Paid, around #1.
Ratings
App Store, worldwide.
What users say about When'd I
From recent reviews.
About When'd I
"When did I last wash the sheets?"
"When did I change the water filter?"
"When did I last call my parents?"
Some things you can never remember. When'd I records just the date you did them.
No goals, no nagging notifications, no checklists. Tap once and it's logged as today.
■ See how long it's been
Every item shows the days since you last did it.
The longer it's been, the more it stands out.
■ A timeline where distance means time
The space between dots is the actual gap between dates.
Busy stretches look dense. The months you skipped show up as empty space.
■ Photos and notes
Attach one photo and a short note to any record.
■ Widgets and Lock Screen
Check what's overdue from your Home Screen, and log without opening the app.
You can even record straight from the Lock Screen. (iOS 16.4+)
■ An optional evening nudge
Once a day, if you want it. Off by default.
■ Entirely on your device
No account, no server, no ads. Your records stay on your phone.
Export and import backup files yourself, and an automatic iCloud copy
brings everything back if you switch phones or reinstall.
■ Buy once
One purchase unlocks everything. No in-app purchases, no subscriptions, no ads.
Latest updates
Store changes
What When'd I changed on its store page: name, icon, screenshots, price, size, languages, requirements.
When'd I Android
When'd I gets 100+ downloads a day worldwide (AppInsider estimate, October 2026, rounded down to a band).
When'd I is #24 in Productivity Paid on Google Play in India and charting in 9 of 23 countries we track.
Updated 25 Oct 2026 · rankings refresh through the day
Productivity PaidWhen'd I on Google Play
App details
When'd I downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Where When'd I's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Where it ranks on Google Play
Every top 200 chart it appears in across 23 countries.
| Country | Charts | Rank |
|---|---|---|
| India | ProductivityPaid | #24 |
 Mexico | ProductivityPaid | #23 |
 Indonesia | ProductivityPaid | #23 |
 Saudi Arabia | ProductivityPaid | #23 |
 United Arab Emirates | ProductivityPaid | #21 |
 Netherlands | ProductivityPaid | #23 |
 Turkey | ProductivityPaid | #23 |
 Thailand | ProductivityPaid | #21 |
 Vietnam | ProductivityPaid | #24 |
Apps near When'd I on the chart
Productivity Paid, around #24.
About When'd I
"When did I last wash the sheets?"
"When did I change the water filter?"
"When did I last call my parents?"
Some things you can never remember. When'd I records just the date you did them.
No goals, no nagging notifications, no checklists. Tap once and it's logged as today.
■ See how long it's been
Every item shows the days since you last did it.
The longer it's been, the more it stands out.
■ A timeline where distance means time
The space between dots is the actual gap between dates.
Busy stretches look dense. The months you skipped show up as empty space.
■ Photos and notes
Attach one photo and a short note to any record.
■ Home screen widgets
Check what's overdue from your Home Screen, and log without opening the app.
■ An optional evening nudge
Once a day, if you want it. Off by default.
■ Entirely on your device
No account, no server, no ads. Your records stay on your phone.
Export and import backup files yourself, and with Android backup (your Google account) on,
your records come back when you switch phones or reinstall.
■ Buy once
One purchase unlocks everything. No in-app purchases, no subscriptions, no ads.
Store changes
What When'd I changed on its store page: name, icon, screenshots, price, size, languages, requirements.
Similar apps
Apps people compare with When'd I: the same core purpose or gameplay, checked one by one.
