Blue Switch vs Sudoku Hint
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Blue Switch
Control 2, 4, or 8 channel Bluetooth BLE relay modules from your iPhone or iPad. Assign custom names to modules and individual relays for easy identification and management. Enhance security by changing the default password.
- Control 2, 4, or 8 channel relay modules
- Bluetooth BLE connectivity
- Assign custom module aliases
- Assign custom relay aliases
- Change default password for security
- Connect to multiple modules
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This app allows you to control a 2, 4 or 8 Channel Relay Module Bluetooth BLE with your iPhone or iPad. To use this app, you need one of these three modules: "2 Channel Relay Module Bluetooth BLE" "4 Channel Relay Module Bluetooth BLE" "8 Channel Relay Module Bluetooth BLE" These modules can be ordered at many online shops. Please use a search engine to find a shop. This app can be connected with any number of modules. By entering an alias, the modules are marked clearly and can easily be assigned to a use area. Name the modules for example "Relay 1", "Relay 2", "Electronic lab project" or "Ambient Light". An alias can also be entered for each relay. The default password for these modules is usually "12345678". For more security, the app also allows you to change the password. The password must be eight digits long.
Sudoku Hint
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Need help with a Sudoku puzzle on paper? Sudoku Hint is a simple AI-powered Sudoku solver, hint tool and mistake checker that works directly from a photo. Take a picture of your paper Sudoku and get one clear hint at a time — without revealing the entire solution. Unlike a traditional Sudoku solver where you have to enter the whole grid manually, Sudoku Hint uses your camera and AI to read the puzzle for you. It is designed to recognize both printed and handwritten Sudoku numbers. USE SUDOKU HINT TO: • Get a Sudoku hint when you are stuck • Check your Sudoku for mistakes • Find an incorrect handwritten number and see the correct value • Scan a paper Sudoku with your camera instead of typing in the grid • Get another hint from the same Sudoku photo • Use “Only look for errors” when you want to solve the rest yourself MADE FOR PAPER SUDOKU Sudoku Hint is especially useful if you enjoy newspaper, magazine or printed Sudoku puzzles. Simply photograph the complete 9×9 Sudoku grid and let the app analyze it. The app distinguishes between the original printed clues and numbers you have written in yourself. This makes it useful both as a Sudoku checker and as a source of hints when you need help with the next move. ONE HINT AT A TIME Sudoku Hint does not immediately show you the completed puzzle. Instead, it gives you one useful Sudoku clue at a time, so you can continue solving the puzzle yourself. If you only want to know whether you have made a mistake, enable “Only look for errors”. SIMPLE AND AD-FREE No ads. No account required. Just take a photo and ask for help. Sudoku Hint includes 3 free hints so you can try it before buying anything. Additional hints can be purchased inside the app. Sudoku Hint uses AI image recognition, which can occasionally misread a number. Always check the photographed grid and use your own judgement when following a hint.
Screenshots
Verdict
The clearest difference is ads: Sudoku Hint at none against Blue Switch's shown. Sudoku Hint also leads on update cadence (every 3 weeks vs every 3 months) and iOS requirement (15.1 vs 18.0). On price, in-app purchases 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
Both are free to download. Blue Switch sells 1 one-off in-app purchase and Sudoku Hint sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Blue Switch ships an update every 3 months, Sudoku Hint every 3 weeks. The most recent releases landed on October 23, 2026 and October 22, 2026 respectively.
| Parameter | Blue Switch | Sudoku Hint |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (43 ratings) — better | — |
| Positive reviews | 16.7% of reviews | — |
| Number of ratings | 43 — better | — |
| Update frequency | Every 3 months | Every 3 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 18.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 39 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Vitalij Schaefer | Leif Lauridsen |
In-app purchases
Blue Switch
- Remove Ads$17.99
Sudoku Hint
- 100 Hints$1.99
Questions
Is Blue Switch free?
Is Sudoku Hint free?
Do Blue Switch or Sudoku Hint have ads?
Which is updated more often, Blue Switch or Sudoku Hint?
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