Comparison

GMT Time vs SD360 W&B

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

SD360 W&B

This utility app calculates an aircraft's center of gravity (CG) and ensures weight distribution is within safe limits. It displays critical weight information, including total aircraft weight, payload weight, and payload bulk percentage.

Highlights
  • CG calculation
  • Weight limit checks
  • Total weight display
  • Payload weight display
  • Payload bulk percentage
Features
Read full description

Calculates the CG of the airplane Ensures the weight in each compartment is within limits Displays the CG limits for the total weight of the airplane Displays airplanes total weight Displays payload total weight Displays payload bulk percentage

Screenshots

GMT Time4 screens
SD360 W&B3 screens

Verdict

The call

The clearest difference is in-app purchases: SD360 W&B at none against GMT Time's 1. SD360 W&B also leads on update cadence (fortnightly vs every 28 months) and rating (5.0 vs 4.7). GMT Time's advantage is ratings volume (38 vs 3). 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. GMT Time sells 1 one-off in-app purchase. SD360 W&B asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

SD360 W&B holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: GMT Time has 38 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

GMT Time ships an update every 28 months, SD360 W&B fortnightly. Both last shipped on November 3, 2026.

Scorecard6 real differences · 4 level
GMT Time versus SD360 W&B: the parameters behind the verdict, then further details
ParameterGMT TimeSD360 W&B
PriceFreeFree
Rating4.7 (38 ratings)5.0 (3 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings38 — better3
Update frequencyEvery 28 monthsFortnightly — better
AdsYes—
In-app purchasesYesNo — better
MonetizationAd-supportedFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.013.0 — better
Further details — not scored
Size26 MB10 MB
Age rating4+4+
DeveloperMingChun ChienSemere Tadesse

Customer experience

GMT Time

All ratings38 ratings
Positive89.5%
Neutral7.9%
Negative2.6%

SD360 W&B

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

GMT Time

One-time1
  • Time117 Pro$0.99
None

SD360 W&B

No in-app purchases

Questions

Is GMT Time free?
GMT Time is free to download, with in-app purchases available.
Is SD360 W&B free?
SD360 W&B is free to download, with no in-app purchases.
Which has better reviews, GMT Time or SD360 W&B?
SD360 W&B is rated higher. GMT Time averages 4.7 out of 5 from 38 ratings, while SD360 W&B averages 5.0 from 3 ratings.
Which is updated more often, GMT Time or SD360 W&B?
GMT Time ships an update every 28 months, and SD360 W&B fortnightly. Most recently, GMT Time was updated on November 3, 2026 and SD360 W&B on November 3, 2026.

Other comparisons