Comparison

GMT Time vs しまった? 鍵・電気の消し忘れ防止

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

Head to head
About

GMT Time

This app provides accurate GMT time using NTP protocol and TrueTime framework. It offers a timekeeping function, allows setting time between two locations for itineraries, and supports multiple languages. Enjoy precise timekeeping with 1/100 second accuracy.

Highlights
  • Accurate GMT time display
  • NTP and TrueTime framework integration
  • Timekeeping function (on/off)
  • Set time between two locations
  • Multi-language support (English, Japanese, Chinese, Cantonese)
  • 1/100 second accuracy
Features
Read full description

NEW IN 1.2: SIMPLE MODE AND MINUTE REPEATER Tap the accessibility icon at the top right of Settings to switch to Simple mode. Local time, manual announcements and settings are on one page. Schedule time windows by weekday with half-hourly or hourly announcements. MINUTE REPEATER GUIDE 1. Choose vibration separately for normal and Silent modes, and whether voice should play in Silent mode. 2. Set Vibration frequency and try the preview. Hourly is the default. Start the announcer to run vibration on its own schedule. 3. Count hours, quarters and remaining minutes, in that order, using a 12-hour clock. At 3:37: 3 long pulses, 2 long-short pairs, 7 short pulses. Each quarter represents 15 minutes. Bell previews use low tones for hours, high-low pairs for quarters and high tones for remaining minutes. Vibration requires a supported iPhone; the feel varies by device and foreground/background state. Background patterns use strong-weak pairs. Background use requires Pro Lock Screen announcements and depends on system and app state. Stopping announcements or entering quiet hours stops scheduled vibration; in-app mute stops sound only. Foreground manual announcements and bell previews can play in Silent mode. Time117 brings network time synchronization, spoken announcements, world clocks and watch records together for everyday timekeeping, travel and collecting. • Spoken time: start or stop announcements, adjust speech speed and signal sounds, and set quiet hours. • World time: choose home and destination zones, share times and set alarms. • Clock views: themes, a large desk clock, widgets and Siri shortcuts. • Watch accuracy: track one watch for free, record offsets and view daily-rate trends. • Acoustic estimates: record mechanical watch ticks with the microphone. When the signal is sufficient, see beat-rate and daily-rate estimates during recording, then confirm and save the full measurement. • Watch standards: explore reference information and official source links. Time117 Pro is a one-time lifetime purchase. It unlocks background and Lock Screen announcements, hourly and custom intervals, ad removal, multiple-watch tracking, and editing collection photos, purchase details and service records. Purchases can be restored. Background announcements support Live Activities and the Dynamic Island on compatible iPhone models. Available in English, Japanese, Traditional and Simplified Chinese, Korean, Spanish, French, German, Brazilian Portuguese, Russian and Indonesian. Collection records and photos stay on your device; there is no built-in cloud sync. Service dates do not schedule reminders. Network time accuracy depends on network and device conditions. Acoustic results are estimates affected by the environment, placement and phone audio clock; they do not replace a professional timegrapher or certification.

About

しまった? 鍵・電気の消し忘れ防止

Features
Read full description

「しまった?」は、外出前の鍵・照明・家電・持ち物を確認し、いつ何を記録したかを残すチェックアプリです。 ■ 自分に合う確認項目 窓の施錠、ガス・コンロ、エアコン、アイロン、水道、ペットの水・餌、財布・鍵、薬など、必要な項目を自由に追加できます。名前、場所・メモ、並び順を変更し、項目ごとに「ON / OFF」「確認した」「持った」を選べます。 ■ 一項目ずつ進む出発チェック 登録した順番で確認し、すべての項目と鍵を記録すると完了します。途中で終了しても状態を保存し、ホームから再開できます。 ■ 最新の安心カードと履歴 本人が記録した確認時刻・結果・確認方法を表示します。確認後にアプリ内の状態や項目を変更した場合は、その事実を最新のカードに表示します。履歴から項目ごとの記録を見返せます。 ■ 任意のリマインダー 通知を許可すると、設定した時刻に外出前の確認をお知らせします。通知を許可しなくても確認機能は利用できます。 アカウント登録は不要です。確認項目や履歴は端末内に保存され、確認機能はオフラインでも利用できます。広告の表示と公開ページの閲覧には通信が必要です。 表示は本人がアプリで記録した内容です。鍵や家電の現在の状態をセンサーで取得したり、実際の施錠・消灯を保証したりするものではありません。 iPhone・iPad、iOS 17以降に対応しています。

Screenshots

GMT Time4 screens
しまった? 鍵・電気の消し忘れ防止3 screens

Verdict

The call

The clearest difference is in-app purchases: しまった? 鍵・電気の消し忘れ防止 at none against GMT Time's 1. しまった? 鍵・電気の消し忘れ防止 also leads on update cadence (every 3 months vs every 28 months). On price, ads, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. GMT Time sells 1 one-off in-app purchase. しまった? 鍵・電気の消し忘れ防止 asks for nothing beyond the download.

UpkeepUpdate frequency

GMT Time ships an update every 28 months, しまった? 鍵・電気の消し忘れ防止 every 3 months. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

Scorecard2 real differences · 7 level
GMT Time versus しまった? 鍵・電気の消し忘れ防止: the parameters behind the verdict, then further details
ParameterGMT Timeしまった? 鍵・電気の消し忘れ防止
PriceFreeFree
Rating4.7 (38 ratings) — better—
Number of ratings38 — better—
Update frequencyEvery 28 monthsEvery 3 months — better
AdsYesYes
In-app purchasesYesNo — better
MonetizationAd-supported—
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.017.0
Further details — not scored
Size26 MB8 MB
Age rating4+4+
DeveloperMingChun ChienTakumi Nakamura

In-app purchases

1 purchases

GMT Time

One-time1
  • Time117 Pro$0.99
None

しまった? 鍵・電気の消し忘れ防止

No in-app purchases

Questions

Is GMT Time free?
GMT Time is free to download, with in-app purchases available.
Is しまった? 鍵・電気の消し忘れ防止 free?
しまった? 鍵・電気の消し忘れ防止 is free to download, with no in-app purchases.
Do GMT Time or しまった? 鍵・電気の消し忘れ防止 have ads?
Both GMT Time and しまった? 鍵・電気の消し忘れ防止 show ads.
Which is updated more often, GMT Time or しまった? 鍵・電気の消し忘れ防止?
GMT Time ships an update every 28 months, and しまった? 鍵・電気の消し忘れ防止 every 3 months. Most recently, GMT Time was updated on November 3, 2026 and しまった? 鍵・電気の消し忘れ防止 on November 5, 2026.

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