Comparison

Delta Calc vs Timer on Me

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

Head to head
About

Delta Calc

Quickly calculate percent changes, discounts, and financial gains without complex math. Solve for any of the three values in the percent change formula with an intuitive interface and fun animations.

Highlights
  • Calculate percent changes
  • Solve for any variable in the formula
  • Customizable decimal places
  • Haptic feedback
  • Fun animations
  • Adjustable keyboard buttons
Features
Read full description

A fast, easy, and fun-to-use percent change calculator. Now you can quickly calculate discounts, financial gains, and percent changes without having to use Excel, Google, or do the long math. Delta Calc can solve for any of the three values within the percent change formula. It solves for the a, b, or c value in the percent change formula ((b - a) / a) * 100 = c. Other features include: - Haptic feedback (can be disabled if desired) - Change the number of decimal places displayed in the result (from 0 to 10) - Fun animation when tapping the swap button (warning: could become addictive) - Delightful to tap number pad buttons - Enable and disable keyboard buttons Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://deltacalc.app/privacy Support: https://deltacalc.app/support

About

Timer on Me

This app offers a versatile multi-timer and stopwatch solution for various activities. It features dedicated interval modes for workouts, allows for numerous simultaneous timers, and provides visual progress cues. Save, share, and customize your timing sessions with ease.

Highlights
  • Dedicated workout interval modes (Tabata, EMOM, 30/30)
  • Up to 50 independent timers and stopwatches
  • Auto-repeat timers
  • Visual progress bars with color cues
  • Customizable timer names and reordering
  • Save and share timer sessions
  • Keep device on mode
Features
Read full description

Timer on Me is the reliable multi-timer and stopwatch for iPhone, iPad, and Apple Watch. Run up to 50 independent timers at once, time interval workouts with precision, and trust that your alerts will fire — even if your phone is locked or the app is closed. ALARMS • Wake-up and reminder alarms with custom labels and weekday schedules • Powered by AlarmKit — rings even when iPhone is locked or Timer on Me is closed • Configurable snooze (3 / 5 / 9 / 15 / 30 minutes) or no snooze • Choose from bundled ringtones or import your own sounds • One-tap enable/disable from the dedicated Alarms tab WORKOUTS & INTERVALS • Built-in Tabata, EMOM, and 30/30 presets — start training in two taps • Custom interval editor with flexible minute/second pickers for work, rest, and rounds • Full-screen workout mode with phase color cues and optional sound mute • Pause, skip, and resume mid-workout without losing your place APPLE WATCH • Full native watchOS app — not a companion shell • Multiple concurrent stopwatches and timers on your wrist • Centisecond stopwatch precision • Dedicated watch complications for one-tap access • Works independently when your iPhone is out of reach 50 TIMERS AT ONCE • Run up to 50 independent timers and stopwatches in a single session • Start, stop, and reset individually or in synced groups • Auto-repeat for looping rounds • Timers continue past zero to track overtime • Visual progress bars with color cues at 50% (yellow) and 10% (red) • Drag-and-drop reordering and custom names RELIABLE ALERTS • AlarmKit: alarms ring even if iPhone is locked or Timer on Me is closed • Dynamic Island and Live Activity for glanceable progress • Home Screen widgets in Small, Medium, and Large sizes • Built-in ringtones including bells, birds, and vintage tones • Tap to preview ringtones instantly before selecting • "Keep Screen On" mode prevents dimming during long sessions CUSTOMIZE & SHARE • Toggle decimals, totals, and percentages per your workflow • Save and overwrite sessions for instant reuse • Export sessions as CSV, JSON, or Plain Text • Share timer setups with teammates, students, or clients BUILT FOR iPhone, iPad & APPLE WATCH • Adaptive layouts for all screen sizes • iPad Split View support • Available in 34 languages PERFECT FOR • HIIT, Tabata, CrossFit, and circuit training • Boxing rounds and martial arts sparring • Studying with Pomodoro and focus blocks • Cooking, baking, and multi-dish meal prep • Classroom activities and group timing • Yoga, meditation, and breathwork • Music practice and public speaking • Board games and party events Download Timer on Me and take full control of your time — at the gym, at work, or at home. Privacy Policy: https://masawata.net/privacy-policy.html Terms Of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Delta Calc3 screens
Timer on Me4 screens

Verdict

The call

The clearest difference is price: Timer on Me at Free against Delta Calc's $0.99. Timer on Me also leads on ratings volume (7 vs 2). Delta Calc's advantage is rating (5.0 vs 4.4) and update cadence (every 3 days vs every 2 weeks). On 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

CostPrice · In-app purchases · Ads · Monetization

Timer on Me is free to download; Delta Calc costs $0.99 up front. Delta Calc sells 3 in-app purchases, starting at $0.99 per month and Timer on Me sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Delta Calc holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 2 and 7 respectively.

UpkeepUpdate frequency

Delta Calc ships an update every 3 days, Timer on Me every 2 weeks. The most recent releases landed on June 1, 2026 and September 14, 2026 respectively.

Scorecard6 real differences · 4 level
Delta Calc versus Timer on Me: the parameters behind the verdict, then further details
ParameterDelta CalcTimer on Me
Price$0.99Free — better
Rating5.0 (2 ratings) — better4.4 (7 ratings)
Positive reviews—66.7% of reviews
Number of ratings27 — better
Update frequencyEvery 3 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPad, Apple Watch — better
Requires iOS17.6 — better26.0
Further details — not scored
Size2 MB9 MB
Age rating4+9+
DeveloperStephen CoffeyWeiren Hsiao

Customer experience

Delta Calc

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Timer on Me

All ratings7 ratings
Positive85.7%
Neutral0.0%
Negative14.3%
Written reviews6 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

In-app purchases

3 purchases

Delta Calc

Subscriptions2
  • Delta Calc Monthly$0.991 Month
  • Delta Calc Yearly$4.991 Year
One-time1
  • Delta Calc Lifetime$9.99
1 purchases

Timer on Me

One-time1
  • More Alarms$0.99

Questions

Is Delta Calc free?
Delta Calc costs $0.99, and also offers in-app purchases.
Is Timer on Me free?
Timer on Me is free to download, with in-app purchases available.
Which has better reviews, Delta Calc or Timer on Me?
Delta Calc is rated higher. Delta Calc averages 5.0 out of 5 from 2 ratings, while Timer on Me averages 4.4 from 7 ratings.
Do Delta Calc or Timer on Me have ads?
Neither Delta Calc nor Timer on Me shows ads.
Which is updated more often, Delta Calc or Timer on Me?
Delta Calc ships an update every 3 days, and Timer on Me every 2 weeks. Most recently, Delta Calc was updated on June 1, 2026 and Timer on Me on September 14, 2026.

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