Timer 555 Calculator vs Ok Boss
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
Ok Boss
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Ok Boss is the ‘Personal Assistant’ you can rely on, to run your tasks smoothly, so you can use your time as you please. Drop & pick up any item, any shopping & purchase (grocery, medicines, fruits, vegetables, clothes, stationery, clothes, gifts, flowers…), Senior citizens help, NRI errands (rent collection, housekeeping, parents visit etc.), Housekeeping, any work at home (home arrangement, cleaning, meal preparation...), wedding errands (invitation mailing, shopping…), Bill payments, appointment setting, ticket booking, accompanying to Doctor, Bank, Shop etc. Business / office errands, Pet services, Conceirge services (ticket booking, travel...) and more… We are here to run your errands! Anything, Anywhere!
Screenshots
Verdict
The clearest difference is in-app purchases: Ok Boss at none against Timer 555 Calculator's 1. Ok Boss also leads on iOS requirement (11.1 vs 13.2). On price, update cadence, 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
Both are free to download. Timer 555 Calculator sells 1 one-off in-app purchase. Ok Boss asks for nothing beyond the download.
Timer 555 Calculator ships an update every 3 months, Ok Boss every 5 months. The most recent releases landed on October 21, 2026 and October 29, 2026 respectively.
| Parameter | Timer 555 Calculator | Ok Boss |
|---|---|---|
| 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 5 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 | 11.1 — better |
| Further details — not scored | ||
| Size | 3 MB | 90 MB |
| Age rating | 4+ | 4+ |
| Developer | Siu Yuen Ho | Aurum Consumer Services Private Limited |
In-app purchases
Timer 555 Calculator
- Unlock Pro feature$0.99
Ok Boss
No in-app purchases
Questions
Is Timer 555 Calculator free?
Is Ok Boss free?
Do Timer 555 Calculator or Ok Boss have ads?
Which is updated more often, Timer 555 Calculator or Ok Boss?
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