LabTimer vs Air Sketch Free
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Four configurable timers
- Count-up and count-down modes
- Large display and buttons
- Customizable text labels
- Repeat count-down functionality
- Disables iPod sleep
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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!
Air Sketch Free
Transform your tablet into a wireless whiteboard. Easily project your live sketches to any web browser on a local computer in real-time, without needing extra hardware or software.
- Real-time drawing projection
- Wireless connectivity
- No extra hardware needed
- Works with standard web browsers
- Peer-to-peer network support
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Turn your iPad into a wireless whiteboard! Draw on your iPad and it appears live in any web browser on the same Wi-Fi network, in 3 easy steps: STEP 1: Launch AirSketch. STEP 2: Enter the indicated URL in a web browser on your computer. STEP 3: Everything you draw is shown in the browser, in real time. AirSketch shows your board in any web browser on the same Wi-Fi. It is not screen mirroring, so viewers see only your board, not the rest of your iPad. NO CLOUD, PLUG-INS, OR DONGLES NEEDED Just open AirSketch on the iPad and visit the URL from any modern browser on the local network. There's no software to install on the computer, no account to create, and nothing leaves your network. FREE YOURSELF FROM THE PODIUM Connect your laptop to a projector, then present and draw from your iPad as you walk around the room. Pass the iPad around so others can contribute. Bring the iPad into your desktop workflow: record your live drawings with any screen recorder, or share them with remote colleagues through Zoom, Teams, Google Meet, or any other meeting software running on the computer. AirSketch is great for the classroom, the boardroom, or on the go. FREE FEATURES: + Fast, fluid sketching with your finger or Apple Pencil. + Real-time drawing to the browser: strokes show up as you draw. + Pen, highlighter, eraser, and a laser pointer to show viewers where to look. + Apple Pencil-only drawing, with palm rejection and a wrist guard. + Zoom and pan with 2 fingers to work in fine detail. The browser view follows your zoom. + Multi-level undo and redo. + Import and annotate the first 3 pages of any PDF, such as exported PowerPoint or Keynote decks. Import from the gallery, or open a PDF in AirSketch from Files, Mail, or any other app. + Up to 3 projects of up to 3 pages each, saved automatically. UPGRADE TO AIRSKETCH PRO Unlock AirSketch Pro in the app to get: + Import every page of a PDF + Photo backgrounds from your photo library + Export as PDF or JPEG + Unlimited projects and pages per project + Lines and shapes + All palettes and custom colors + Zoom lock for viewers + Freeze frame: pause what viewers see while you prepare the next part + Password-protected viewing + Project categories + Hide the AirSketch logo for viewers Choose a monthly or yearly subscription, each with a 1-week free trial, or unlock AirSketch Pro once for life with a single purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. You can manage or cancel them in your App Store account settings. WORKS ON STANDARD WEB BROWSERS AirSketch works with any modern browser, including Safari, Chrome, Firefox, and Edge, on a Mac, PC, Chromebook, or even another iPad or iPhone. WE BUILD APPS FOR PEOPLE WHO CHANGE THE WORLD We have designed and built a whole suite of apps that help you create and communicate. Check them out on our website. If you like AirSketch, you will also want to try Vittle, which turns your iPad into a recordable whiteboard. Check out our developer page for the link. Keep on creating! -- The AirSketch team at Qrayon. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy policy: https://www.qrayon.com/home/privacy/
Screenshots
Verdict
The clearest difference is rating: Air Sketch Free at 4.5 against LabTimer's 4.0. LabTimer's advantage is in-app purchases (none vs 3) and review sentiment (91% vs 67%). On price, ratings volume, ads and monetization model 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
Both are free to download. Air Sketch Free sells 3 in-app purchases, starting at $2.99 per month. LabTimer asks for nothing beyond the download.
Air Sketch Free holds the better App Store score, 4.5 against 4.0. Both are backed by a comparable volume of ratings — 172 and 82 respectively. Written reviews complicate that: 91% of LabTimer's written reviews are positive against 67% of Air Sketch Free's, so the app with the better star average is not the one people write more warmly about.
LabTimer ships an update every 11 months, Air Sketch Free every 22 months. The most recent releases landed on October 31, 2026 and November 10, 2026 respectively.
| Parameter | LabTimer | Air Sketch Free |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (172 ratings) | 4.5 (82 ratings) — better |
| Positive reviews | 90.7% of reviews — better | 66.7% of reviews |
| Number of ratings | 172 — better | 82 |
| Update frequency | Every 11 months — better | Every 22 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 10.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 1 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | 0x0c | Qrayon, LLC |
Customer experience
LabTimer
Air Sketch Free
Bugs and requests
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)
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- 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
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- 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
Air Sketch Free
Not enough reviews yet to summarise bugs or requests.
In-app purchases
LabTimer
No in-app purchases
Air Sketch Free
- AirSketch Pro Monthly Subscription7 Days trial$2.991 Month
- AirSketch Pro Annual Subscription7 Days trial$19.991 Year
- AirSketch Pro Lifetime$29.99









