Comparison

年号電卓Plus vs See through Calculator

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

Head to head
About

年号電卓Plus

Easily convert between Western and Japanese eras, and determine birth years from age. Explore historical context with explanations for era changes and significant events of each year.

Highlights
  • Western to Japanese era conversion
  • Japanese era to Western conversion
  • Calculate birth year from age
  • View era start and end dates
  • Understand reasons for era changes
  • Discover major events of each year
Features
Read full description

年号・元号の変換に迷ったら、このアプリひとつで解決! 待望の西暦和暦早見表に対応しました! 西暦⇔和暦の変換から、年齢での誕生年検索まで、日常のちょっとした疑問をすばやく解消できます。 さらに Apple Watch に対応! 手首でサッと確認できるようになりました。 調べるだけでなく、改元の理由やその年の主な出来事もわかるので、歴史の勉強や雑学としても楽しめます。 【変換モード】 ・西暦 → 和暦(令和・平成・昭和・大正・明治) ・各元号 → 西暦 ・年齢 → 西暦・和暦(誕生年を逆算) 【詳細情報】 ・各元号の開始年・終了年を表示 ・改元の理由(iPhone版のみ) ・その年の主な出来事 ※Apple Watch版では改元理由の表示はありません。 【iPhone版・Apple Watch版の違い】 ・iPhone版は西暦和暦早見表に対応。 ・iPhone版はテンキー入力に対応。和暦の上限を超えた年(例:大正16年)をそのまま入力・表示しながら、西暦や次の元号への変換結果を確認できます。 ・Apple Watch版はテンキー入力の代わりにカウント操作を採用。和暦の上限に達すると自動的に次の元号へ切り替わるため、直感的に操作できます(例:大正15年の次は自動で昭和2年に)。 【Apple Watch版の操作】 ・上にスワイプすることで、年齢・各元号の開始年/終了年・その年の主な出来事をまとめて確認できます。 ・+/-ボタンの長押しで高速カウントアップ/カウントダウンが可能。目的の年にすばやくたどり着けます。

About

See through Calculator

Features
Read full description

A calculator app where the background is transparent and you can calculate while looking at the numbers written under the iPhone (calculator app)

Screenshots

年号電卓Plus4 screens
See through Calculator1 screens

Verdict

The call

The clearest difference is ads: 年号電卓Plus at none against See through Calculator's shown. See through Calculator's advantage is update cadence (fortnightly vs every 6 weeks) and iOS requirement (15.8.3 vs 17.6). On price, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

年号電卓Plus ships an update every 6 weeks, See through Calculator fortnightly. The most recent releases landed on October 12, 2026 and October 4, 2026 respectively.

Scorecard3 real differences · 5 level
年号電卓Plus versus See through Calculator: the parameters behind the verdict, then further details
Parameter年号電卓PlusSee through Calculator
PriceFreeFree
Positive reviews37.5% of reviews—
Update frequencyEvery 6 weeksFortnightly — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, Apple WatchiPhone, iPad, iPod — better
Requires iOS17.615.8.3 — better
Further details — not scored
Size7 MB35 MB
Age rating4+4+
DeveloperNakanishi ToshihikoHideaki Uchikoshi

In-app purchases

None

年号電卓Plus

No in-app purchases

None

See through Calculator

No in-app purchases

Questions

Is 年号電卓Plus free?
年号電卓Plus is free to download, with no in-app purchases.
Is See through Calculator free?
See through Calculator is free to download, with no in-app purchases.
Do 年号電卓Plus or See through Calculator have ads?
See through Calculator shows ads; 年号電卓Plus does not.
Which is updated more often, 年号電卓Plus or See through Calculator?
年号電卓Plus ships an update every 6 weeks, and See through Calculator fortnightly. Most recently, 年号電卓Plus was updated on October 12, 2026 and See through Calculator on October 4, 2026.

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