Comparison

Unit Converter vs When Again?

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

Head to head
About

Unit Converter

Easily convert between various units of measurement for everyday tasks. This application offers a simple and convenient user interface for quick calculations. Convert speed, weight, distance, temperature, and more with ease.

Highlights
  • Simple and convenient UI
  • Perform various unit conversions
  • Convert speed, weight, distance, temperature
  • Easy to use for everyday tasks
Features
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Your go-to unit converter app for everyday use. Simple, convenient and easy UI. You can easily perform various unit conversions. For example, you can convert Shohei Ohtani's pitching speed from mph to km/h, the weight of a bowling ball from pounds to kilograms, the speed of a car from km/h to mph, the distance in golf from yards to meters/feet, or the temperature from °F to °C. Download the "Unit Converter - simple & easy" app and efficiently convert units. Try it now!!

About

When Again?

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"When did I last do that?" Bike oil changes, haircuts, salon visits, AC cleaning, doctor appointments, pet care — things you do again and again, but once enough time passes, you can't remember when you last did them. When Again? clears up that little everyday question with a single tap. Just log the date. The app automatically counts the days since you last did it, learns your average interval from your own records, and gives you a heads-up when it's about time. ■ Who it's for ・People who forget when their bike or car was last serviced ・Anyone managing regular salon, hair, or nail appointments ・People tracking doctor visits, medication, or health habits ・Anyone who wants to stop thinking "wow, it's already been a while" ・People who want to start right away — no account needed ■ Key features ◎ See the days at a glance Your items line up on the home screen, each with a badge showing how many days since you last did it. What needs doing now is obvious. ◎ "About time" reminders, automatically The app learns your average interval from your records, gathers the items coming due at the top of the home screen, and reminds you with notifications too. ◎ Track anything Use the preset categories or add your own with custom icons and colors. From bike maintenance to beauty to health — manage it all in one app. ◎ Photos, tags, amounts, and notes It's more than a date log. Add up to 5 photos, tags, the amount you spent, and notes to each record — so you can look back on what state it was in last time and how much it cost. ◎ Detailed history and stats The detail screen shows stats like "since last time," "average interval," and totals, plus a month-by-month timeline. ◎ Search Search across notes, tags, and item names to find past records instantly. ◎ Easy backup Save and restore all your records to a file (photos included). CSV export is also supported. ◎ Dark mode Choose system, light, or dark. ■ Privacy first All your records are stored only on your device. No account, no login. We never send your records to a server — so you can start with peace of mind. ■ Pricing The core features are free. Some premium features are available via a one-time in-app purchase. Leave your everyday "when was that again?" to When Again?

Screenshots

Unit Converter4 screens
When Again?4 screens

Verdict

The call

The clearest difference is in-app purchases: Unit Converter at none against When Again?'s 1. Unit Converter also leads on ads (none vs shown) and iOS requirement (13.0 vs 16.4). When Again?'s advantage is update cadence (daily vs every 8 days). On price and device support 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. When Again? sells 1 one-off in-app purchase. Unit Converter asks for nothing beyond the download.

UpkeepUpdate frequency

Unit Converter ships an update every 8 days, When Again? daily. The most recent releases landed on October 13, 2026 and October 8, 2026 respectively.

Scorecard4 real differences · 6 level
Unit Converter versus When Again?: the parameters behind the verdict, then further details
ParameterUnit ConverterWhen Again?
PriceFreeFree
Rating3.0 (1 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 8 daysDaily — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPod — betteriPhone
Requires iOS13.0 — better16.4
Further details — not scored
Size55 MB59 MB
Age rating4+4+
DeveloperHorikiri SeiuMasamune Hiroiwa

In-app purchases

None

Unit Converter

No in-app purchases

1 purchases

When Again?

One-time1
  • プレミアム(買い切り)$4.99

Questions

Is Unit Converter free?
Unit Converter is free to download, with no in-app purchases.
Is When Again? free?
When Again? is free to download, with in-app purchases available.
Do Unit Converter or When Again? have ads?
When Again? shows ads; Unit Converter does not.
Which is updated more often, Unit Converter or When Again??
Unit Converter ships an update every 8 days, and When Again? daily. Most recently, Unit Converter was updated on October 13, 2026 and When Again? on October 8, 2026.

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