Decade vs When'd I
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Decade
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Ten years will pass either way. The only question is whether you'll have a tree. Decade turns what you put into money, health and reading into a tree that grows. Log once a day and it grows a little. Stop, and it doesn't die. One tree, five stages Seedling, sapling, growing, mature, ancient. Size isn't your streak. It's your accumulated years — each year's completion rate multiplied by how much of that year you were here, added up. Three areas, one tree Wealth. Set a monthly amount to put in. Log the transfer. Health. Set a weekly count or duration. Knowledge. Set books per year. Track reading with a timer. Run all three, or just one. A missed day doesn't reset anything Most habit apps score you on consecutive days. Miss one and you start over. This one doesn't. Finish sixty percent of the year and the tree grows sixty percent. That sixty percent stays. Health and knowledge allow two backfills a month. Wealth allows none — the transfer either happened or it didn't. The first thirty days are a calibration window. Adjust your targets freely; aiming too high costs you nothing. Blossom and fruit At ninety percent of your yearly target, the tree blossoms. At one hundred, it fruits, and the fruit stays until January first. At the end of each year, that year is recorded as a good year or a lean one, and drawn as a ring. Lean years get drawn too. They were part of it. About the rate of return Wealth projections use a rate you enter yourself. The screen always says "you assume X%", because that's what it is — an assumption, not a promise. This app recommends no investments and tells you nothing about what to buy. No account, no server No sign-up, no login. Open it and use it. Everything stays on your phone. Nothing is uploaded. You are not tracked. Decade Pro — one purchase, not a subscription Removes ads Twelve tree styles: sakura, maple, ginkgo, ink, gold leaf, glass, ember, coin and more iCloud backup and restore on a new device Bought once is bought. Tap Restore Purchases on a new phone. The free version works forever, with all three areas fully available.
When'd I
This app helps you track when you last performed specific tasks or activities. It visualizes the time elapsed since your last action and allows you to add photos and notes to each entry. Features include widgets and lock screen access for quick logging and checking.
- Track last performed activities
- Visualize time elapsed
- Add photos and notes
- Home screen widgets
- Lock screen logging
- Optional evening nudge
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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.
Screenshots
Verdict
The clearest difference is price: Decade at Free against When'd I's $2.99. Decade also leads on update cadence (daily vs every 4 days). When'd I's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support and iOS requirement 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
Decade is free to download; When'd I costs $2.99 up front. Decade sells 1 one-off in-app purchase. When'd I asks for nothing beyond the download.
Decade ships an update daily, When'd I every 4 days. The most recent releases landed on October 25, 2026 and October 29, 2026 respectively.
| Parameter | Decade | When'd I |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | — | 1.0 (1 ratings) — better |
| Positive reviews | — | 90.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Daily — better | Every 4 days |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | — | Paid |
| Best chart rank | — | #89 — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 58 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | ZIH LONG GUO | HyunWoo Lee |
In-app purchases
Decade
- Decade Pro$4.99
When'd I
No in-app purchases









