Comparison

Units vs LabTimer

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

Head to head
About

Units

Easily convert between hundreds of units across 43 categories, including currency with daily updated rates. Customize your workflow by hiding or reordering units and categories.

Highlights
  • Hundreds of units across 43 categories
  • Daily updated currency exchange rates
  • Hide unused units
  • Reorder units and categories
  • Universal app support (iPhone, iPod touch, iPad)
Features
Read full description

Units is the fast, friendly unit converter. Type a number into any unit and instantly see it in every other one, all on a single screen. There's no picking what to convert from and to, no digging through menus, and no ads. With more than 800 units across 43 categories, Units covers everyday conversions like length, weight, volume and temperature, and the ones you need less often, from torque and fuel consumption to data rates, shoe sizes and musical notes. SEE EVERYTHING AT ONCE • Enter a value in any unit and every other unit in the category updates as you type • A keypad made for numbers, so the decimal point is always right where you need it CURRENCY • Convert between more than 160 currencies • Exchange rates updated every day MAKE IT YOURS • Hide the units you never use, so the ones you need are always in view • Reorder units and categories so your favorites come first • Switch on a two-column layout to see even more at a glance • Leave a tip to unlock a collection of alternative app icons MADE FOR YOUR DEVICES • Designed for iPhone and iPad, with your categories and conversion side by side on larger screens • Makes full use of iPhone Duo, whether it's open or closed • Handoff picks up a conversion where you left off on another device • Supports Dark Mode and Dynamic Type Units has been converting since 2008, and is lovingly made in Scotland.

About

LabTimer

This app provides multiple configurable timers for various uses, from scientific experiments to everyday tasks like cooking and workouts. It features a clear display, customizable labels, and the ability to repeat count-down timers.

Highlights
  • Four configurable timers
  • Count-up and count-down modes
  • Large display and buttons
  • Customizable text labels
  • Repeat count-down functionality
  • Disables iPod sleep
Features
Read full description

LabTimer is a count-up and alarming count-down multi-timer. ***NEWS*** LabTimerPhD is now available. It has all the same functionality as LabTimer. If you like LabTimer, please consider picking up LabTimerPhD! I'll use the suggestions on LabTimerPhD for future changes. All updates will be applied to both applications. ***NEWS*** The look and feel of LabTimer is designed to emulate that of standard lab timers, providing quick access to count-down timers and repeat runs. LabTimer is not just good for the lab, though - it is also convenient for cooking, medication timing, working out, and child timeouts. LabTimer has the following features: - Four timers, individually configurable as count-up or alarming count-down - Large display and buttons - Display in Hours : Minutes : Seconds (limit above 1000 hours) - Customizable text labels for each timer - Small icons describing the state of all timers - Disables iPod sleep, keeping your timer running and visible - Designed to satisfy the lab needs of my molecular biologist wife Count-down timers each: - Display the projected finish time - Alarm for one minute - After the alarm, display the time elapsed since finish in red - Repeat the last count-down by: -- pressing clear while the timer is paused -- pressing start/stop twice after the timer has finished The iPhone currently prevents background processes, so LabTimer cannot alarm if the application is not running. However, the screen can be locked while the timers are running. The alarm also plays over and does not interrupt any playing music. While this will finally let you keep your noise-isolating headphones on during long incubations, please remember to experiment responsibly. There are many timers and stopwatches on the App Store, but they did not fulfill my (or my wife's) needs. We're now using LabTimer, and we hope you will too. LabTimer is free and will remain free. I've created LabTimerPhD, a pay app with identical features, if you'd like to contribute to future development. I haven't seen anyone else doing this and it seems like an interesting way of handling donations. :) Please let me know what you think and how LabTimer can be improved, either via a review or the e-mail address on the website. Thanks for looking!

Screenshots

Units4 screens
LabTimer4 screens

Verdict

The call

The clearest difference is in-app purchases: LabTimer at none against Units's 3. LabTimer also leads on ads (none vs shown) and review sentiment (91% vs 60%). Units's advantage is update cadence (monthly vs every 11 months). On price, rating 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. Units sells 3 one-off in-app purchases. LabTimer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.1 for Units against 4.0 for LabTimer. Both are backed by a comparable volume of ratings — 50 and 172 respectively. Written reviews are what separate them: 60% of Units's written reviews are positive against 91% of LabTimer's.

UpkeepUpdate frequency

Units ships an update monthly, LabTimer every 11 months. The most recent releases landed on October 26, 2026 and October 22, 2026 respectively.

Scorecard7 real differences · 3 level
Units versus LabTimer: the parameters behind the verdict, then further details
ParameterUnitsLabTimer
PriceFreeFree
Rating4.1 (50 ratings) — better4.0 (172 ratings)
Positive reviews60.0% of reviews90.7% of reviews — better
Number of ratings50172 — better
Update frequencyMonthly — betterEvery 11 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.010.0 — better
Further details — not scored
Size86 MB1 MB
Age rating4+4+
DeveloperHomegrown Software Ltd0x0c

Customer experience

Units

All ratings49 ratings
Positive79.6%
Neutral4.1%
Negative16.3%
Written reviews580 reviews
Positive60.0%
Neutral12.1%
Negative27.9%

LabTimer

All ratings174 ratings
Positive70.1%
Neutral12.1%
Negative17.8%
Written reviews118 reviews
Positive90.7%
Neutral5.9%
Negative3.4%

User reviews

Units

From 50 App Store ratings

What we love

  • 🚀 Efficient and fast conversions
  • 👍 Comprehensive list of units
  • 🔍 Customizable unit selection
  • 💰 Free app with optional paid version
  • 🔧 Useful for engineering and technical work

Room to improve

  • 🐛 Crashes and stability issues
  • 🕰️ Outdated currency conversion rates
  • 🔍 Too many unit categories, hard to navigate
  • 💰 Ads in free version
  • 📏 Ruler feature not accurate on some devices

LabTimer

From 172 App Store ratings

What we love

  • 👍 Simple, clean, and intuitive user interface
  • 🎯 Multiple timers (up to 16) running simultaneously
  • ⏱️ Ability to count up and count down
  • 🔄 Timers continue running in background/other apps
  • 💾 Saves timer settings for future use

Room to improve

  • 🐛 Notifications not working properly on iPad
  • 🐛 App crashes or won't open on some iOS versions
  • 🐛 Alarm doesn't work when app is locked/in background
  • 📱 No landscape/auto-rotate orientation support
  • 🔊 Alarm sound too short and soft

Bugs and requests

Units

Reported bugs

4 issues
  • Crashes when clearing input fields
  • Numerical keypad covers conversion results
  • Incompatibility issues with newer iOS versions
  • Ruler measurements not accurate on all devices

Requested features

5 requests
  • Add nautical units (miles, knots)
  • Improve currency conversion accuracy and updates
  • Allow customization of visible unit categories
  • Add more clothing/shoe size conversions
  • Improve user interface and search functionality

LabTimer

Reported bugs

6 issues
  • iPad notifications not displaying correctly
  • App fails to open on iPhone X with iOS 14.4
  • Alarm non-functional on iOS 5 in lock mode
  • No audio output on iOS 9.x
  • Timer stops when iPhone enters sleep mode (older versions)
Show 1 more
  • App incompatibility with newer iOS versions

Requested features

17 requests
  • Landscape orientation support (especially for iPad)
  • Keyboard/direct number input for faster time entry
  • Multiple selectable alarm sounds/tones
  • Ability to customize alarm volume independently
  • Countdown voice announcements
Show 12 more
  • Screen lock display of timer countdown
  • Millisecond/decimal second precision
  • Different alarm sounds for different timers
  • Visual alerts (screen flash) in addition to sound
  • Ability to decrease time values (not just increase)
  • Timer interaction/chaining (one timer starts another)
  • Configurable alarm duration
  • Days display option for very long timers
  • All timers visible on single screen
  • Ability to add notes to timers
  • Push notifications when app is closed
  • Recording custom alarm messages

In-app purchases

3 purchases

Units

One-time3
  • Small Tip$0.99
  • Medium Tip$2.99
  • Large Tip$4.99
None

LabTimer

No in-app purchases

Questions

Is Units free?
Units is free to download, with in-app purchases available.
Is LabTimer free?
LabTimer is free to download, with no in-app purchases.
Which has better reviews, Units or LabTimer?
Units is rated higher. Units averages 4.1 out of 5 from 50 ratings, while LabTimer averages 4.0 from 172 ratings.
Do Units or LabTimer have ads?
Units shows ads; LabTimer does not.
Which is updated more often, Units or LabTimer?
Units ships an update monthly, and LabTimer every 11 months. Most recently, Units was updated on October 26, 2026 and LabTimer on October 22, 2026.

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