Shift Unit vs iStory
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Shift Unit
This utility app offers precise unit and currency conversions with over 1400 units across 34 categories. It supports light/dark modes, home widgets, and an independent Apple Watch app. Features include a custom keypad with calculator mode and educational Wikipedia integration.
- 1400+ conversion units
- 34 categories
- Light/dark mode support
- Home widget
- Apple Watch app
- Custom keypad with calculator
- Wikipedia integration
Read full descriptionHide full description
Shift Unit is a unit converter designed with usability and numerical precision in mind. It features 1400+ conversion units across 34 categories. It works great in light or dark mode, and as a Home Widget w/ localized number displays. Independent WatchOS app and complications. Operations can be carried out in portrait mode in simple precision (7 significant digits,) or in landscape mode in double precision (14 significant digits.) Conversion formulae use exact definitions of related entities--not approximations. Wikipedia page information can be pulled for categories and conversion units. (Look for info circle.) The custom keypad has a calculator mode, and allows to enter/edit numbers on either side of the conversion. Unit categories include Acceleration, Angle, Area, Bit Rate, Clock, Online Currencies, Data Storage, Area Density, Volumetric Density, Electric Charge, Electric Current, Energy, Volumetric Flow Rate, Force, Frequency, Fuel, Length, Luminance, Lux, Mass Flow Rate, Momentum, Power, Pressure, Radiation Dose, Radioactivity, Radiation Exposure, Speed, Temperature, Temperature Delta, Time, Torque, Typography, Volume, and Weight. Features: - One screen operation minimizing number of gestures - Numbers (digits, decimal/grouping separators, exponent)/time/country names localized to your (or any) region - Current time in 2 out of 439 world cities and see your cities pinned on a flyover map, an educational way of discovering the world through time zones - Weather conditions and forecast for time zone cities - Dedicated accessibility labels and hints for VoiceOver operations - Customizable number entry timeout allowing to enter a new number without having to clear the field. (Turned off when an accessibility feature, e.g. VoiceOver, is on) - Customizable user interface (preferred categories; user interface alignment for left/right-handed entry or 2-thumb operations) - Ability to swap units while keeping initial numerical entry - Category presets for quick change of context, including user preset - Long-press category button to remove, or add a category on the fly - Long-press number field for copy/paste - Paste Mathematical constants (Pi, e, etc.) - Education via Wikipedia pages for categories and conversion units - Currency conversions using online rates - Searchable list of currency rates with possibility to change base rate - Set favorite currencies - Built-in numeric keypad (with calculator mode) to enter numbers on either side of the conversion - Long-press delete key to clear the field in focus - Engineering number format handling - Infinity and negative numbers handling - 7 or 14-digit precision displays (3-digit fractions for currencies) - Searchable list of 1400+ conversion units across 34 categories - On-boarding screens for general operations and for the Currency category (turned off when VoiceOver is on) - Home widget for quick conversions using units selected in the hosting app Happy Conversions!
iStory
Relive your digital history by exploring all the Apple devices you've owned and the memories captured with them. This app organizes your photos by device, provides insightful statistics, and allows you to export visual summaries of your tech journey.
- Device archive of owned Apple products
- Photo timeline organized by device
- Device and photo statistics
- Exportable infographics
- Offline use
- Privacy-focused data collection
Read full descriptionHide full description
Introducing iStory: Your Personal Apple Device Archive and Photo Journey Ever wondered about the amazing memories captured through your Apple devices over the years? With iStory, relive your digital journey like never before! This innovative app offers a unique experience, allowing you to seamlessly explore all the Apple devices you've owned and cherish the moments captured with them. Key Features: Device Archive: Dive into the past and rediscover the evolution of your Apple devices. iStory compiles a comprehensive archive, showcasing every iPhone, iPad and iPod that you've ever owned. Track the progression of technology in your life and see how far you've come! Photo Timeline: Unearth the treasure trove of memories stored on your devices. iStory intelligently organizes all your photos based on the device they were taken with. Scroll through your personal photo timeline and witness the moments that shaped your life. From your first iPhone to the latest iPad, every picture tells a story. Device and Photo Statistics: Delve into the numbers behind your digital history! iStory provides insightful statistics on the devices you've owned, and the photos taken over the years. Discover fascinating trends and patterns that highlight your tech and photographic preferences. Exportable Infographics: Turn your digital journey into a visual masterpiece! iStory allows you to export a personalized infographic summarizing your device history and photo statistics. Share these infographics on social media or keep them as a unique keepsake of your tech-savvy adventures. Privacy First: iStory prioritizes your privacy. You can use the app offline, no data is collected in any way. Enjoy the benefits of reliving your digital history without compromising on security. Download iStory now and embark on a captivating journey through your Apple device legacy. Rediscover the magic of your digital moments and celebrate the evolution of technology in your life! Note: iStory is not affiliated with Apple Inc. and works independently to provide a personalized digital archive experience. Check our privacy policy at: https://istory.timelabs.io#privacypolicy. Terms and conditions: https://istory.timelabs.io#terms
Screenshots
Verdict
The clearest difference is rating: Shift Unit at 5.0 against iStory's 4.7. Shift Unit also leads on update cadence (every 2 months vs every 5 months). 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.
Shift Unit holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 21 and 14 respectively.
Shift Unit ships an update every 2 months, iStory every 5 months. The most recent releases landed on September 6, 2026 and September 10, 2026 respectively.
| Parameter | Shift Unit | iStory |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (21 ratings) — better | 4.7 (14 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 21 — better | 14 |
| Update frequency | Every 2 months — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, Apple Watch — better | iPhone |
| Requires iOS | 16.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 20 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Didier Burton | Timelabs Ltd |
Customer experience
Shift Unit
iStory
In-app purchases
Shift Unit
No in-app purchases
iStory
No in-app purchases









