BTWATTCH vs Calculator+
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BTWATTCH
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ラトックシステムのワットチェッカーREX-BTWATTCH1で計測された消費電力・電流・電圧など各種データを表示するアプリケーションです。 ■主な機能 1)消費電力・電流・電圧をリアルタイム表示 2)消費電力量を電気料金・CO2排出量に換算表示 3)消費電力量を1時間・１日・1ヶ月単位でグラフ表示 4)計測データをCSVファイル保存 最新版のマニュアルは以下のURLをご覧ください。 https://www.ratocsystems.com/pdffile/eco/btwattch1.pdf
Calculator+
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【主な機能】 ● 計算機能 最大15桁の計算が可能。 ● 外貨換算機能 ・119ヵ国のレート換算に対応。 ・ユーザー設定でよく使う国を設定可能!! ・通貨コードや、国名、地方名でお探しの国を検索出来ます。 ● レート更新機能 ボタンひとつでレート更新が可能。 ● 国旗、通貨コード、通貨記号の表示機能 色んな国の国旗や通貨コード、通貨記号が表示される為学習にも◎
Screenshots
Verdict
The clearest difference is update cadence: BTWATTCH at every 2 months against Calculator+'s every 9 months. BTWATTCH also leads on iOS requirement (9.0 vs 16.0). On price, ads, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
BTWATTCH ships an update every 2 months, Calculator+ every 9 months. The most recent releases landed on May 16, 2026 and September 11, 2026 respectively.
| Parameter | BTWATTCH | Calculator+ |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 9.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 1 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | RATOC Systems, Inc. | n1system ltd. |
In-app purchases
BTWATTCH
No in-app purchases
Calculator+
No in-app purchases
Questions
Is BTWATTCH free?
Is Calculator+ free?
Do BTWATTCH or Calculator+ have ads?
Which is updated more often, BTWATTCH or Calculator+?
Other comparisons
