Comparison

Zulu Time vs Calmity

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

Head to head
About

Zulu Time

This app displays local and UTC (Zulu) time, along with multiple time zones, on your iPhone, Apple Watch, and iPad. It offers widgets for quick access and features for calculating future or past times with offsets, simplifying timezone conversions for various professions.

Highlights
  • Display local and Zulu (UTC) time
  • Multiple time zone display
  • Home and Lock Screen widgets
  • Apple Watch complications
  • Future/past time offset calculations
  • Time zone conversion
Features
Currently charting
Read full description

An iPhone, Apple Watch and iPad app to see Local and Zulu time (GMT) or multiple time zones in a single glance. Includes Widgets for both the iPhone and Apple Watch. Useful for pilots in getting weather briefings and filing flight plans, or Ham radio operators to do timezone conversions. No more worrying about getting the timezone offset correct or Daylight Savings Time conversions. Easily convert from different time zones, including times in the future or past. On the iPhone: - Home and Lock Screen widgets - The Zulu Time page gives a quick view of both Zulu and Local times - The Offset Time page allows you to see Zulu and local time either in the future or past by entering an offset via the Offset button. Tapping either Zulu or Local times will allow you to enter a time in the future or past, synchronizing both Local and Zulu times with that offset. The offset only applies to this view (except on the iPad the offset applies to everything on the page) - The Multiple Zones page allows you to add as many time zones as you wish in a scrolling view. Clicking on any Time Zone will allow you to change it. on iPad: All information is combined on one screen. You have user customizable time zones on the right hand side. On the left, you have Zulu and Local time and one customizable time zone. The offset to see future or past time can be done via the Offset button or tapping any of either the Zulu, Local or Custom time buttons on the left. On the Watch: Complications available in all watch faces making for glanceable ZuluTime and access to the app, which gives offset able time computation.

About

Calmity

Features
Read full description

Calmity is a real-time panic-episode companion and behavior change system that treats panic less like a mysterious medical event and more like a repeating pattern with incentives, avoidance habits, and social consequences. In the moment, it runs a no-friction ‘take over my brain’ protocol: short commands, timed breathing, sensory grounding, and a ruthless focus on getting you through the next 180 seconds. Afterward, it does the part most apps avoid: it asks what you don’t want to admit. Not just ‘what triggered you,’ but what you were trying to avoid (a conversation, an email, intimacy, being judged, leaving the house), what you gained (escape, reassurance, attention, permission to stop), and what it cost (missed work, relationship strain, self-trust erosion). It then builds a personalized prevention plan that targets the real loops: avoidance, reassurance-seeking, safety behaviors, caffeine/sleep debt, rumination, and “I need certainty” checking. The uncomfortable edge: many people don’t just want calming—they want a private authority figure that tells them what’s real, gives permission to bail, or forces them not to. The app leans into that by offering two modes: ‘Rescue’ (stabilize now) and ‘Exposure’ (do the hard thing safely, on purpose). It tracks which one you choose and shows you the truth: are you getting better, or are you getting better at escaping? FEATURES: • One-tap ‘Panic Button’ with a 3-minute guided protocol (breathing, grounding, body scanning) designed for minimal reading and maximal compliance • AI ‘Command Mode’: short, directive prompts that reduce decision fatigue (e.g., “Stand up. Feet on floor. Name 5 objects. Inhale 4.”) • Post-episode ‘No-Lies Debrief’: guided reflection that captures trigger, context, sensations, catastrophic story, safety behaviors, avoidance, reassurance-seeking, and the hidden payoff • Personal Pattern Map: timeline heatmap of triggers (sleep debt, caffeine, alcohol, conflict, deadlines, loneliness, hormonal cycle, social exposure) and the user’s most common escape routes • Rescue vs Exposure Plan: personalized weekly plan with graded exposure tasks, ‘anti-avoidance’ nudges, and scripts for reducing reassurance behaviors • Reassurance Budget Partner Mode (optional): set limits on checking/texting; generate healthier messages that don’t recruit others into the panic loop SUBSCRIPTION INFORMATION: • Free trial available - try all premium features before subscribing • Subscription automatically renews unless cancelled at least 24 hours before the end of the current period • Payment will be charged to your Apple ID account at the confirmation of purchase • Your account will be charged for renewal within 24 hours prior to the end of the current period • You can manage and cancel your subscriptions by going to Settings Apple ID Subscriptions Privacy Policy: https://hatchingpoint.com/calmity/privacypolicy Terms of Use: https://hatchingpoint.com/calmity/terms

Screenshots

Zulu Time4 screens
Calmity4 screens

Verdict

The call

The clearest difference is price: Calmity at Free against Zulu Time's $0.99. Calmity also leads on update cadence (every 2 weeks vs every 3 months). Zulu Time's advantage is in-app purchases (none vs 2) and ads (none vs shown). On 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

Calmity is free to download; Zulu Time costs $0.99 up front. Calmity sells 2 in-app purchases, starting at $9.99 per month. Zulu Time asks for nothing beyond the download.

UpkeepUpdate frequency

Zulu Time ships an update every 3 months, Calmity every 2 weeks. The most recent releases landed on November 6, 2026 and October 25, 2026 respectively.

Scorecard5 real differences · 6 level
Zulu Time versus Calmity: the parameters behind the verdict, then further details
ParameterZulu TimeCalmity
Price$0.99Free — better
Rating4.8 (2.6K ratings) — better—
Positive reviews78.6% of reviews—
Number of ratings2.6K — better—
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree—
Best chart rank#89 — better—
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS17.617.0 — better
Further details — not scored
Size16 MB17 MB
Age rating4+4+
DeveloperDerek SpearsHatching Point LLC

Bugs and requests

Zulu Time

Reported bugs

3 issues
  • Complication freezes after a few days
  • Zulu time loses accuracy over time on Apple Watch
  • Widget not updating local time properly

Requested features

5 requests
  • Add alarm feature
  • Allow landscape mode for bedside clock view
  • Provide option for always-on display
  • Add time zone map for quick reference
  • Show day of year in display

Calmity

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Zulu Time

No in-app purchases

2 purchases

Calmity

Subscriptions2
  • Monthly Premium7 Days trial$9.991 Month
  • Yearly Premium7 Days trial$59.991 Year

Questions

Is Zulu Time free?
Zulu Time costs $0.99, with no in-app purchases.
Is Calmity free?
Calmity is free to download, with in-app purchases available.
Do Zulu Time or Calmity have ads?
Calmity shows ads; Zulu Time does not.
Which is updated more often, Zulu Time or Calmity?
Zulu Time ships an update every 3 months, and Calmity every 2 weeks. Most recently, Zulu Time was updated on November 6, 2026 and Calmity on October 25, 2026.

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