TimeSignals vs GMT Time
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TimeSignals
This app provides an hourly time signal feature for your iPhone, offering gentle reminders with customizable chimes or spoken voices. Schedule signals in 30-minute intervals, and they will play even when the app is closed, unless Do Not Disturb is active.
- Hourly time signal
- Customizable voice options
- Chime and cuckoo clock sounds
- Scheduled alerts
- Background operation
- Adjustable intervals
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TimeSignals is an app that adds an hourly time signal feature to your iPhone. It gently reminds you of the time you may have forgotten with a chime at unexpected moments. You can choose the time signal voice from options like Japanese or English. Time signals can be scheduled in 30-minute intervals between 00:00 and 23:30 on the time setting screen. Once set, the time signal will play at the scheduled times even if the app is not running. (However, if Do Not Disturb mode is active, the time signal will not sound.) Please note that we do not respond to App Store reviews or questions posted there. For inquiries or requests, please contact us via the support email within the app. About the time signal, cuckoo clock, and chime sounds: The time signal does not differentiate between the hour and half-hour, nor does it indicate the specific time. The cuckoo clock chimes the number of hours on the hour and once at the half-hour. The chime distinguishes between the hour and half-hour but does not indicate the specific time. Use this option if you prefer not to have spoken announcements. The voice data for [Japanese Ami 12 o’clock] was provided by the following site: https://amitaro.net/ I'm sorry. I am not good at English. Thank you for interested.
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.
- 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
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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.
Screenshots
Verdict
The clearest difference is update cadence: TimeSignals at every 4 weeks against GMT Time's every 28 months. GMT Time's advantage is rating (4.7 vs 4.5) and monetization model (ad-supported vs free with in-app purchases). 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. TimeSignals sells 2 one-off in-app purchases and GMT Time sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
GMT Time holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: GMT Time has 38 ratings behind it against 6, so its average is the more settled of the two.
TimeSignals ships an update every 4 weeks, GMT Time every 28 months. The most recent releases landed on November 10, 2026 and November 3, 2026 respectively.
| Parameter | TimeSignals | GMT Time |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (6 ratings) | 4.7 (38 ratings) — better |
| Positive reviews | 49.1% of reviews | — |
| Number of ratings | 6 | 38 — better |
| Update frequency | Every 4 weeks — better | Every 28 months |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 334 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Yasushi Sakai | MingChun Chien |
Customer experience
TimeSignals
GMT Time
In-app purchases
TimeSignals
- Remove Ads.$1.99
- Use of User-Created Sounds$2.99
GMT Time
- Time117 Pro$0.99









