Physical Constants vs Redy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Physical Constants
Access a comprehensive list of physical constants, organized by category for easy searching. This app supports all AppStore languages and allows users to report corrections via email.
- Physical constants database
- Categorized by topic
- Search functionality
- Multi-language support
- User feedback for corrections
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Application that displays the physical constants. Classified by category, easy to search. Supports all languages in the AppStore. If you find something to be corrected, please send an E-mail (English or Japanese).
Redy
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With the Redy application, carry out and analyze your science experiments made with Redy wireless sensors easily. From data acquisition to data processing, Redy will accompany you both in the classroom and in your outdoor PWs. You can carry out all desired experiments thanks to the numerous sensors available and the possibility to connect 4 sensors simultaneously. Connect one or more Redy sensors to your tablet or smartphone via Bluetooth and benefit from an application with intuitive and easy-to-use features. - Benefit from assistance in carrying out your experiments. You have guides related to your Redy sensors: experiment files. These resources include PW protocols, guidance, diagrams, installation visuals, results examples … They are developed and tested by teachers. They are available in you Redy application or online and freely downloadable from your digital platform https://www.plateformenum.jeulin.fr" - Display the values of your measurements in real time. You can read them in different ways: in digital format or in bargraph, as a graph or via the value table. - Take photos or videos to associate your measurements to a key moment of your experiment. - Analyze your data through powerful and simple data processing and modelling tools. Use the pointer to identify the coordinates of a point, annotate the curves, and determine the endpoint through the tangent method during a pH metric dosing … All the essential tools for your analysis are available. - Write your report directly in the application. - Customize your application and display only the elements you want to appear. You can also display 4 elements simultaneously on the screen of your tablet or smartphone. The graph of your experiment, the value measured live the camera snap, the value table... you are the one who choses what interests you! Your Redy sensors can also be used other than connected to a tablet or a smartphone. You can read the value measured directly on the sensor screen, save the measurements in the internal memory of your sensor and then transfer them to a computer or a tablet to be processed, or connect your sensors to a computer via USB-C (free software). The Redy wireless sensors are the most versatile Bluetooth sensors available. + more information on the Redy sensors on https://en.jeulin.fr/en-products/datalogging/redy-wireless-sensors.html
Screenshots
Verdict
The clearest difference is ads: Redy at none against Physical Constants's shown. Redy also leads on update cadence (every 4 months vs every 9 months). On price, in-app purchases, device support and iOS requirement 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.
Physical Constants ships an update every 9 months, Redy every 4 months. The most recent releases landed on August 24, 2026 and September 9, 2026 respectively.
| Parameter | Physical Constants | Redy |
|---|---|---|
| Price | Free | Free |
| Rating | 3.3 (3 ratings) — better | — |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 9 months | Every 4 months — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 12.2 |
| Further details — not scored | ||
| Size | 25 MB | 71 MB |
| Age rating | 4+ | 4+ |
| Developer | Takuya Ishikawa | Jeulin |
In-app purchases
Physical Constants
No in-app purchases
Redy
No in-app purchases
Questions
Is Physical Constants free?
Is Redy free?
Do Physical Constants or Redy have ads?
Which is updated more often, Physical Constants or Redy?
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