Comparison

Amperes 4 vs Interval Timer

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

Head to head
About

Amperes 4

This app helps you understand your device's charging performance. It diagnoses charging issues, compares different charging methods, and monitors battery health with detailed data and alarms. Get insights into your power setup for optimal device longevity.

Highlights
  • Battery charging rates (mA and wattage)
  • Hardware comparison testing
  • Detailed charging graphs
  • Global charging speed benchmarking
  • Intelligent battery alarms
  • System vital monitoring
Features
Currently charting
Read full description

Take Control of Your Power with Amperes 4 Stop guessing why your phone is charging slowly. Amperes 4 is the ultimate diagnostic tool designed to help you test your charging setup, identify faulty hardware, and monitor your device's health with professional-grade precision. Key Features Battery Charging Rates: Get the mA and wattage data to see exactly how much juice is flowing into your battery. Hardware Comparisons: Side-by-side testing for wired vs. wireless chargers, power banks, and different cable types. Deep Data & Graphs: Visualize your charging sessions with detailed, interactive graphs that track performance over time. Global Benchmarking: Compare your charging speeds with other users online to see if your gear is performing at its peak. Intelligent Battery Alarm: Get notified the moment your battery reaches your desired level to help prolong its lifespan. System Vital Monitoring: Track thermal status, memory usage, and disk space alongside your battery metrics. Professional Testing Tools Customized Logging: Add notes about wire brands or charger models to your tests for future reference. Color-Coded Results: Intuitive UI instantly shows you if a charger is "Good," "Average," or "Bad." Exportable Data: Need the raw numbers? Export your test results for external analysis or record-keeping. Why Amperes 4? Whether you are testing a brand-new GaN charger, verifying a "fast-charging" cable, or troubleshooting a power bank, Amperes 4 gives you the transparency you need to keep your devices running efficiently. Stop wasting time with bad cables. Get the data. Get Amperes 4.

About

Interval Timer

This versatile timer app allows users to create custom sequences for various activities, from breathwork and workouts to focus sessions and cooking. It offers AI-powered voice guidance, iCloud synchronization across Apple devices, and a minimalist black-and-white interface.

Highlights
  • Customizable timer chains
  • Breathwork flow builder
  • Intermittent fasting timers
  • Workout routine creator
  • Focus and Pomodoro timers
  • AI voice guidance
  • iCloud sync across devices
Features
Read full description

"This isn't just another timer app. This is your favorite timer app's favorite timer app" - Cody Lee, iDownloadBlog. "What I like most about TimeWave, though, is its clean, black-and-white design" - John Voorhees, MacStories. "Liquid Glass really comes to life on its widgets" - Michael Burkhardt, 9to5Mac. "Best iPhone Apps of July, 2021" - Beau Hamilton, Slashdot. WHAT CAN YOU DO WITH TIMEWAVE? TimeWave allows you to combine your breathwork app, your workout app, your focus timer, cooking timer and much more into one single app. You can use TimeWave for: • Breathwork — build custom breathing flows like 4-7-8 Breathing to lower blood pressure, Physiological Sigh to reduce stress and anxiety, Wim Hof Breathing to increase alertness, Box Breathing to relax and much more. • Intermittent Fasting — Create your own intermittent fasting using various splits like 16:8, 12:12, 5:2, etc. You can create timer-splits for each day or for the entire week. • Workout Routines — create your own workouts by chaining excercise and break durations. You can make Tabata/HIIT workouts or even yoga routines. • 20-20-20 Rule — create a timewave to follow the 20-20-20 rule (Every 20 minutes look at something 20 ft away for 20 seconds) while working with screens to prevent eye-strain. • Focus Timers — create pomodoro timers or any kind of work-break timewaves. You are not restricted to 25 minute session, you can create any sequence that suits your preferences. • Cooking — ever had to keep resetting your timers after each whistle? well, now you wont have to. Just create a timewave for each recipe. • Everything — anything else that involves timed sequential tasks. SPECIAL FEATURES: • TimeWave A.I — TimeWave will tell you what has to be done for how long while the Calibre is running. For eg: "Breathe In For 4 Seconds" so you don't have to look at the screen. • iCloud Sync — Available on Mac, iPad, iPhone and Apple Watch and keeps everything up-to to date on all your devices with iCloud Sync. • Black & White UI — B&W is a lot of colours. If you are anything like us, you'll love our ironically modern black and white UI. MORE: • Personal touch — a hand-crafted Indie app. If you have any questions or feedback, you can reach out to us at timewave.team@gmail.com Privacy Policy: https://timewaveapp.com/privacy Terms of Use: https://timewaveapp.com/terms

Screenshots

Amperes 44 screens
Interval Timer4 screens

Verdict

The call

The clearest difference is price: Interval Timer at Free against Amperes 4's $2.99. Interval Timer also leads on review sentiment (86% vs 47%) and update cadence (every 3 weeks vs every 2 months). Amperes 4's advantage is in-app purchases (none vs 3) and ratings volume (644 vs 25). On rating, ads 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

Interval Timer is free to download; Amperes 4 costs $2.99 up front. Interval Timer sells 3 in-app purchases, starting at $4.99 per month. Amperes 4 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Interval Timer holds the better App Store score, 4.6 against 4.4. That said, the two scores are not equally well evidenced: Amperes 4 has 644 ratings behind it against 25, so its average is the more settled of the two. Written reviews point the same way: 47% of Amperes 4's written reviews are positive against 86% of Interval Timer's.

UpkeepUpdate frequency

Amperes 4 ships an update every 2 months, Interval Timer every 3 weeks. The most recent releases landed on September 23, 2026 and September 22, 2026 respectively.

Scorecard8 real differences · 3 level
Amperes 4 versus Interval Timer: the parameters behind the verdict, then further details
ParameterAmperes 4Interval Timer
Price$2.99Free — better
Rating4.4 (644 ratings)4.6 (25 ratings) — better
Positive reviews46.9% of reviews85.7% of reviews — better
Number of ratings644 — better25
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
Best chart rank#52 — better—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, Mac, Apple Watch — better
Requires iOS17.0 — better26.0
Further details — not scored
Size36 MB49 MB
Age rating4+4+
DeveloperCrioSoft LLCMuhammed Sahil Arayakandy

Customer experience

Amperes 4

All ratings644 ratings
Positive86.3%
Neutral3.4%
Negative10.2%
Written reviews224 reviews
Positive46.9%
Neutral8.0%
Negative45.1%

Interval Timer

All ratings25 ratings
Positive92.0%
Neutral0.0%
Negative8.0%
Written reviews7 reviews
Positive85.7%
Neutral0.0%
Negative14.3%

Bugs and requests

Amperes 4

Reported bugs

4 issues
  • Charging test results in total nonsense
  • Doesn't work on iPad in landscape mode
  • Login screen freezes
  • Incompatible with older devices

Requested features

4 requests
  • Dark mode option
  • Advanced analytics dashboard
  • Ability to save charger/wire names
  • Ability to monitor charging in the background

Interval Timer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Amperes 4

No in-app purchases

3 purchases

Interval Timer

Subscriptions2
  • Monthly Premium$4.991 Month
  • Yearly Premium7 Days trial$24.991 Year
One-time1
  • Lifetime Premium$49.99

Questions

Is Amperes 4 free?
Amperes 4 costs $2.99, with no in-app purchases.
Is Interval Timer free?
Interval Timer is free to download, with in-app purchases available.
Which has better reviews, Amperes 4 or Interval Timer?
Interval Timer is rated higher. Amperes 4 averages 4.4 out of 5 from 644 ratings, while Interval Timer averages 4.6 from 25 ratings.
Do Amperes 4 or Interval Timer have ads?
Neither Amperes 4 nor Interval Timer shows ads.
Which is updated more often, Amperes 4 or Interval Timer?
Amperes 4 ships an update every 2 months, and Interval Timer every 3 weeks. Most recently, Amperes 4 was updated on September 23, 2026 and Interval Timer on September 22, 2026.

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