Comparison

IntervalTimer(x) vs ZaWorld

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

Head to head
About

IntervalTimer(x)

This app provides a customizable interval timer for workouts, focus sessions, and breaks. It offers audio cues, visual progress, and tracks workout history locally. Optional body metrics can be entered for calorie estimates, all stored securely on your device.

Highlights
  • Customizable work/rest/sets intervals
  • Audio cues for transitions
  • Workout history log
  • Local calorie estimates
  • Offline functionality
  • Siri Shortcuts integration
Features
Read full description

IntervalTimer - Train On Your Terms IntervalTimer is a clean, customizable interval timer built for workouts, focus sessions, and recovery breaks. Set your work duration, rest duration, and number of sets , then let the app keep you on pace with audio cues and a visual progress indicator. Your data stays on your device. IntervalTimer collects no personal data and has no account system. Everything - your workout history, body metrics, timer configurations, and intentions - is stored locally using Apple's SwiftData framework. Nothing leaves your phone. There are no servers, no cloud sync, no analytics pipelines, and no third-party SDKs tracking your behavior. The optional body metrics (weight, height, sex) you enter for calorie estimates are saved only in your device's local storage via UserDefaults. They are never transmitted, never shared, and never used for any purpose beyond the in-app calorie calculation you see on screen. Features: - Fully customizable work/rest/sets intervals - Audio cues for transitions and completion - Workout history log with session details - Calorie estimates based on your local profile - Intentions tracking to reflect on your mindset - Pre-configured templates to get started fast - Siri Shortcuts and Spotlight integration - Works entirely offline - always Disclaimer: Calorie estimates are educational only and not a substitute for medical advice.Consult a healthcare provider before making health decisions.

About

ZaWorld

Features
Read full description

[Concept] Byouyomi – Limit Break Timer is a count-up timer designed for 30 seconds of all-out physical effort. Its true value lies in the final 10 seconds—when things get toughest. • Just like in a 30-second Shogi match, the app counts aloud “1, 2, 3…” to build tension and sharpen your focus. • When you’re nearing your limit, shout “The World!” and time will stop. Break your limits with your own voice. That’s what this timer is all about. Perfect for core training, multi-ball table tennis drills, planks, and other high-intensity workouts. Visuals, voice, and tension—experience a new kind of countdown timer designed to push you beyond your limits. [Features] ● Tap the screen to begin. A 3-second countdown is followed by a 30-second count-up.  - Audio cues signal the countdown and the start.  - Time is displayed with numbers and a visual gauge. ● The app uses Shogi-style voice countdown—with a rising count from 1.  - Audio cues at 10 and 20 seconds  - After 20 seconds, it counts aloud every second from 1 to 9 ● After 20 seconds, shout “The World!” to stop time.  - Microphone and speech recognition permissions are required  - During time stop, the display and voice effects change dramatically ● At the end of 30 seconds, you’ll hear an audio cue.  - If time stop is active when you reach 30 seconds, a special sound plays to boost your motivation.

Screenshots

IntervalTimer(x)4 screens
ZaWorld4 screens

Verdict

The call

IntervalTimer(x) and ZaWorld are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 17, 2026 and October 7, 2026 respectively.

ScorecardNo meaningful differences
IntervalTimer(x) versus ZaWorld: the parameters behind the verdict, then further details
ParameterIntervalTimer(x)ZaWorld
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 3 weeksEvery 3 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhoneiPhone, iPad — better
Requires iOS18.117 — better
Further details — not scored
Size9 MB5 MB
Age rating4+4+
DeveloperShapeHaven Innovations LLCOMTea App

In-app purchases

None

IntervalTimer(x)

No in-app purchases

None

ZaWorld

No in-app purchases

Questions

Is IntervalTimer(x) free?
IntervalTimer(x) is free to download, with no in-app purchases.
Is ZaWorld free?
ZaWorld is free to download, with no in-app purchases.
Do IntervalTimer(x) or ZaWorld have ads?
Neither IntervalTimer(x) nor ZaWorld shows ads.
Which is updated more often, IntervalTimer(x) or ZaWorld?
IntervalTimer(x) ships an update every 3 weeks, and ZaWorld every 3 weeks. Most recently, IntervalTimer(x) was updated on September 17, 2026 and ZaWorld on October 7, 2026.

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