Timer 555 Calculator vs +XP BASE
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
+XP BASE
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+XP BASE is a device that uses a mobile phone to control a dual motor device or a single motor device for bed or sofa applications
Screenshots
Verdict
The clearest difference is in-app purchases: +XP BASE at none against Timer 555 Calculator's 1. Timer 555 Calculator's advantage is update cadence (every 3 months vs every 16 months). On price, ads, 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. +XP BASE asks for nothing beyond the download.
Timer 555 Calculator ships an update every 3 months, +XP BASE every 16 months. The most recent releases landed on September 24, 2026 and September 9, 2026 respectively.
| Parameter | Timer 555 Calculator | +XP BASE |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (8 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Every 3 months — better | Every 16 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13.2 | 12.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 67 MB |
| Age rating | 4+ | 4+ |
| Developer | Siu Yuen Ho | Qingdao Richmat Intelligence Technology Inc. |
In-app purchases
Timer 555 Calculator
- Unlock Pro feature$0.99
+XP BASE
No in-app purchases
Questions
Is Timer 555 Calculator free?
Is +XP BASE free?
Do Timer 555 Calculator or +XP BASE have ads?
Which is updated more often, Timer 555 Calculator or +XP BASE?
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