LED Calc. vs Timer 555 Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LED Calc.
This application assists in designing electronic circuits by calculating the necessary resistor values for LEDs. It simplifies the process of determining the correct components for your LED projects.
- Resistor value calculation
- LED circuit design assistance
- Component value determination
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This app calculates the value of resistor, when designing a circuit using LED.
Timer 555 Calculator
Calculate monostable and astable circuits for electronics projects. Determine pulse width and frequency, find component combinations, and save/upload data. Supports multiple languages.
- Monostable circuit pulse width calculation
- Astable circuit frequency calculation
- Component combination finder
- Save component values to CSV
- Upload CSV via AirDrop/iCloud Drive
- Multi-language support
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This app is used to calculate monostable and astable circuit. Features * Calculate pulse width of monostable circuit * Calculate frequency of astable circuit * Find out combination of components making a desire pulse width in monostable circuit * Find out combination of components making a desire frequency in astable circuit * Saving component values in CSV file * Upload generated CSV files via AirDrop or iCloud Drive * Support English, German, French, Italian, Spanish, Portuguese, Japanese, Korean, Russian
Screenshots
Verdict
The clearest difference is review sentiment: Timer 555 Calculator at 100% against LED Calc.'s 50%. Timer 555 Calculator also leads on rating (3.9 vs 1.0) and ads (none vs shown). LED Calc.'s advantage is in-app purchases (none vs 1). On price, 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. Timer 555 Calculator sells 1 one-off in-app purchase. LED Calc. asks for nothing beyond the download.
Timer 555 Calculator holds the better App Store score, 3.9 against 1.0. That said, the two scores are not equally well evidenced: Timer 555 Calculator has 8 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of LED Calc.'s written reviews are positive against 100% of Timer 555 Calculator's.
LED Calc. ships an update every 10 months, Timer 555 Calculator every 3 months. The most recent releases landed on June 5, 2026 and September 24, 2026 respectively.
| Parameter | LED Calc. | Timer 555 Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 3.9 (8 ratings) — better |
| Positive reviews | 50.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 | 8 — better |
| Update frequency | Every 10 months | Every 3 months — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 — better | 13.2 |
| Further details — not scored | ||
| Size | 17 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Jibiki Works | Siu Yuen Ho |
Customer experience
LED Calc.
Timer 555 Calculator
In-app purchases
LED Calc.
No in-app purchases
Timer 555 Calculator
- Unlock Pro feature$0.99
Questions
Is LED Calc. free?
Is Timer 555 Calculator free?
Which has better reviews, LED Calc. or Timer 555 Calculator?
Do LED Calc. or Timer 555 Calculator have ads?
Which is updated more often, LED Calc. or Timer 555 Calculator?
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