Strobe Light Tachometer vs iHP48
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Strobe Light Tachometer
Transform your iPhone into a powerful strobe light and tachometer. Precisely control flashing speeds from 1Hz to 130Hz to measure the RPM of rotating objects by making them appear stationary. Ideal for precise speed measurements in dark environments.
- Adjustable strobe speed (1-130Hz / 60-7800RPM)
- Quick adjustment buttons (x2, ÷2)
- Fine-tuning buttons for precise speed
- Manual RPM input
- Display speed in Hz and RPM
- Light/dark background option
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NOTE: The App is just for iPhone with flashlight. It doe NOT work on iPad, iPod touch or any iOS device without flashlight. Description: Using this App, you can control the flashing on/off speed of your phone flashlight between 1Hz to 130Hz. In another word, this App makes your iPhone into a strobe light. What's the Application then?! You can use this App to use your iPhone as a tachometer that measures the speed of any rotating object. How to use it? Suppose you have a fan and need to measure its speed (RPM). Turn on the fan in a DARK environment, launch the App on your iPhone (that has flashlight). Manually tune the speed using the main slider of the App to see the rotating object looks almost not moving. Then, start fine tuning using the three buttons in the App to get the exact speed. At this point the rotating object looks like stationary! But, it is moving! So, never touch the moving/rotating object during your test! Features: - Slider to adjust strobe light speed between 1-130Hz (60-7800RPM) - x2 and ÷2 buttons for quick adjustment of flashing speed - 3 Buttons for fine tuning of the speed up to 2 decimal: 0X.00, 00.X0, 00.0X - Textfield to manually enter the speed in RPM (tap on the speed label) - Button for light and dark background option - showing the speed in both Hz and RPM - simple and easy to use!!
iHP48
This app brings the powerful HP48 calculator experience to your mobile device. It offers enhanced performance, seamless file management, and a customizable interface with support for various HP calculator models. Enjoy a familiar and convenient calculator solution without needing extra hardware.
- Supports HP38, HP39, HP48, HP49, HP50 calculators
- Haptic feedback and customizable zoom options
- Seamless file transfer via iTunes and Files app
- Cloud storage integration (iCloud, OneDrive, Dropbox)
- Object saving/loading and copy/paste functionality
- Access to calculator packages, skins, and ROMs
- Internal file manager and extensible settings
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Introducing iHP48 - Your Ultimate Calculator Companion iHP48 emerges from the necessity to revive the unparalleled calculator experience cherished by university students and engineers across various disciplines. Reviving the legacy of the original calculator, iHP48 delivers enhanced performance without the burden of carrying an additional device in your bag. Experience the simplicity and convenience of having the powerful HP48 at your fingertips once again. Key Features: Wide Compatibility: iHP48 supports HP38, HP39, HP48, HP49, and HP50 calculators. Easily configure your preferred calculator with the Fetch options. Enhanced User Experience: Enjoy Haptic feedback on keypress and customizable haptic styles via Settings. Zoom options tailored to your iPhone and preferences, including a new lift zoom for XS devices. Seamless File Management: Transfer files effortlessly from your computer using iTunes on both PC's and MacOS. Access iHP48 files directly from your device using the Files app and share them with any compatible iOS app. Copy files to and from your favorite cloud providers supported by the Files app, such as iCloud Drive, OneDrive, and Dropbox. Convenient Object Handling: Save or Load objects to/from your device using Files, ensuring your favorite .lib is readily available on your iHP48 stack. Copy and Paste supported objects seamlessly between iOS and the iHP48 Stack. Comprehensive Library: Access a rich library of Calculator Packages, Skin Collections, ROM's, and useful libraries like Meta Kernel and QPI. Intuitive Interface: Benefit from an internal File Manager for simplified file management and an extensible Settings administration accessible directly from the Settings app or via a shortcut from the iHP48 menu. Customizable Experience: Save your current calculator configuration for easy access. Explore special features embedded in various skins, including screen swipes, sounds, and orientation options. No Hidden Costs: iHP48 is completely free, devoid of any enterprise, professional, plus, or ultimate versions. There are no hidden features or payments required. We greatly appreciate any support you offer as we continue to enhance and refine iHP48. For additional information, visit https://www.thinkchile.com/iHP48. Experience the power of the legendary HP48, reinvented for the modern era with iHP48.
Screenshots
Verdict
The clearest difference is rating: iHP48 at 4.7 against Strobe Light Tachometer's 4.2. iHP48 also leads on update cadence (monthly vs every 7 months) and review sentiment (88% vs 63%). Strobe Light Tachometer's advantage is iOS requirement (7.0 vs 15.0). On price, ratings volume, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
iHP48 holds the better App Store score, 4.7 against 4.2. Both are backed by a comparable volume of ratings — 277 and 270 respectively. Written reviews point the same way: 63% of Strobe Light Tachometer's written reviews are positive against 88% of iHP48's.
Strobe Light Tachometer ships an update every 7 months, iHP48 monthly. The most recent releases landed on September 22, 2026 and September 19, 2026 respectively.
| Parameter | Strobe Light Tachometer | iHP48 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (277 ratings) | 4.7 (270 ratings) — better |
| Positive reviews | 63.2% of reviews | 88.2% of reviews — better |
| Number of ratings | 277 — better | 270 |
| Update frequency | Every 7 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 7.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 4 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Motionics LLC | Alexis Lorca |
Customer experience
Strobe Light Tachometer
iHP48
User reviews
Strobe Light Tachometer
From 277 App Store ratingsWhat we love
- ✅ Accurate frequency and RPM measurements
- 👍 Simple and user-friendly interface
- 🎓 Excellent educational tool for teaching frequency concepts
- 💰 Free application
- ⚡ Quick and easy to use, even one-handed
Room to improve
- 💡 LED flash brightness is too dim
- 🐛 Strobe light cuts out or blacks out intermittently
- 🐛 Inconsistent and erratic flashing patterns
- ⚠️ Hardware compatibility issues with older iPhone models
- 🐛 Strobe stops working after extended use
iHP48
From 270 App Store ratingsWhat we love
- 🚀 Excellent emulation of HP48
- 👍 Familiar and nostalgic feel
- 👍 Comprehensive functionality
- 👍 Customizable skins
- 👍 Haptic feedback
Room to improve
- 🐛 Occasional crashes or freezes
- 🐛 Missed keystrokes when typing quickly
- 🐛 Blank or flickering display
- 🐛 Compatibility issues with newer iOS versions
Bugs and requests
Strobe Light Tachometer
Reported bugs
9 issues- Strobe light cuts out every 2-3 seconds then resumes
- LED flashes erratically on certain iPhone models (iPhone 14, iPhone XS, iPhone SE)
- Strobe pulse is inconsistent and misses beats
- App crashes or stops working after 20-30 minutes
- Requires manual LED activation before starting strobe
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- Incompatibility error message on iPhone devices
- Strobe accuracy degrades at higher frequencies (above 45 Hz)
- Flash pulses vary in length and brightness at high frequencies
- App shows "only compatible with iPhone" error on iPhone devices
Requested features
7 requests- Ability to adjust brightness while strobe is running
- Display accuracy specifications and hardware limitations
- Option to set frequency by Hz in addition to RPM
- Ability to specify number of fan blades for accurate RPM calculation
- 2x and 1/2x multiplier options
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- Reduced or removed advertisements
- Display maximum blink rate for device hardware
iHP48
Reported bugs
3 issues- Crashes on startup
- Inability to save state across sessions
- Incompatibility with certain iOS devices
Requested features
4 requests- Dark mode option
- Ability to disable haptic feedback
- Support for HP50G emulation
- Improved keyboard mapping and arrow key functionality
In-app purchases
Strobe Light Tachometer
No in-app purchases
iHP48
No in-app purchases









