When'd I
by HyunWoo Lee
- Productivity
- Paid
- Small & simple · 97
- Rating
- 1.0
- 1 ratings · US storefront
- Top 100%among 106 Productivity apps
- Last update
- Oct 19, 2026
- Version 4.3.0
- Size
- 31 MB
- Category
- Productivity
- Tracked since
- Oct 10, 2026
Estimated revenue
A model estimate with a likely range, not a reported figure.
No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.
How this estimate is made
Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.
Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.
Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.
Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.
Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.
Full methodScreenshots
As shown on the App Store listing.
About this app
Text from the App Store listing.
Stop managing to-dos. Just remember when you last did it.
"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.
What’s new
Release notes for the latest version, as written by the developer.
Use "Mark as complete" in the ⋯ menu of an item's details to complete it once you're done. It gets a check mark after its name and drops out of cycles, overdue items and notifications; past records stay. See them under "Completed" in the "Category" and "Calendar" tabs of "Catalog".
Tap the year and month title above a calendar to jump straight to any year and month.
If you use iCloud on several devices, the completed status syncs to your other devices too. Please update all your devices.
Rank history
Daily position in the South Korea charts. #1 is at the top.
- Best rank
- #7
- Current rank
- #7
- Days charting
- 6 of 7
On the charts today
Small & simple score
How realistic it is for a small team to build something like this.
97/100
Small & simple
- Developer size100% · 25
Developer: 1 app on the charts
- Audience size100% · 20
Ratings: 1
- App size100% · 10
Size: 31 MB
- Price model100% · 15
Price model: paid
- Demand proof90% · 30
Best rank #1, 5 countries
An indicator, not a fact. We can't see team size. Calculated Oct 24, 2026 · method i2
How the score worksVersion history
- 4.3.0LatestReleased Oct 19, 2026
- 4.1.0Released Oct 6, 2026