Timer 555 Calculator vs Pedal Builder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
Pedal Builder
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This app is built to help you track your pedal builds and the inventory of parts. As you build pedals manually cross referencing your inventory is slow and tedious. With this app you can simply populate your inventory. Then add a pedal build and from the bill of materials add parts and you will be alerted if they are already in your inventory or not. Additionally, you can create a list of parts needed for that next order!
Screenshots
Verdict
The clearest difference is price: Timer 555 Calculator at Free against Pedal Builder's $1.99. Timer 555 Calculator also leads on update cadence (every 3 months vs every 19 months) and iOS requirement (13.2 vs 16.0). Pedal Builder's advantage is in-app purchases (none vs 1). On ads 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
Timer 555 Calculator is free to download; Pedal Builder costs $1.99 up front. Timer 555 Calculator sells 1 one-off in-app purchase. Pedal Builder asks for nothing beyond the download.
Timer 555 Calculator ships an update every 3 months, Pedal Builder every 19 months. The most recent releases landed on October 5, 2026 and October 7, 2026 respectively.
| Parameter | Timer 555 Calculator | Pedal Builder |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 3.9 (8 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Every 3 months — better | Every 19 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.2 — better | 16.0 |
| Further details — not scored | ||
| Size | 3 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Siu Yuen Ho | John Toms |
In-app purchases
Timer 555 Calculator
- Unlock Pro feature$0.99
Pedal Builder
No in-app purchases
Questions
Is Timer 555 Calculator free?
Is Pedal Builder free?
Do Timer 555 Calculator or Pedal Builder have ads?
Which is updated more often, Timer 555 Calculator or Pedal Builder?
Other comparisons
