Pressures vs Timer 555 Calculator Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Pressures
Easily convert pressure measurements between bar, atm, MPa, and psi. This tool offers automatic conversion as you type and allows you to share your results. Its intuitive design ensures a smooth and pleasant user experience.
- Automatic conversion for bar, atm, psi, MPa
- Copy conversion results
- Share conversions
- Intuitive graphics
- Ease of use
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Pressures is the first App that connects 4 more frequently used units of pressure measurement: bar, atm, MPa and psi. An indispensable tool alwayes on hand. Just open the App and start typing the desired value to convert. It will be calculated automatically in all other units. And if you want to share your conversions, it is now possible. [ Features ] • Automatic conversion to the 4 units: bar, atm, psi and MPa • Copy the result to paste everywhere. • Share your conversions. • Intuitive graphics • Ease of use [ Design ] The graphics are perfected to the last detail to make using simple, fluid and pleasant. Optimized for Retina Display on the iPhone and iPad. [ Compatibility ] • Devices: all iPhone, iPad and iPod. • iOS : 9.0 or later. [ Supported languages ] • English, Italian, Spanish, French, German, Portuguese, Dutch, Russian, Chinese and Japanese. [ Support ] If you need help please contact us at info@lionsapp.com, or visit our website www.lionsapp.com If you enjoy the app, don’t forget to give us a review on the App Store.
Timer 555 Calculator Pro
Calculate parameters for monostable and astable circuits. Find component combinations for desired pulse width or frequency. Share circuit files via iCloud Drive or AirDrop.
- Calculate monostable pulse width
- Calculate astable frequency
- Find component combinations
- Adjust component tolerance
- Unlimited combinations (Pro)
- Share circuit files
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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 * Share file to iCloud Drive (For iOS8 or later) * Share file via AirDrop Additional Features in the Professional Edition * Unlimited number of combinations * Allow to change tolerance * No ads
Screenshots
Verdict
The clearest difference is review sentiment: Timer 555 Calculator Pro at 100% against Pressures's 75%. Timer 555 Calculator Pro also leads on update cadence (every 3 months vs every 14 months). Pressures's advantage is rating (5.0 vs 4.7) and iOS requirement (9.0 vs 13.2). On price, ratings volume, ads and in-app purchases 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
Pressures costs $0.99 and Timer 555 Calculator Pro $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Pressures holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews complicate that: 75% of Pressures's written reviews are positive against 100% of Timer 555 Calculator Pro's, so the app with the better star average is not the one people write more warmly about.
Pressures ships an update every 14 months, Timer 555 Calculator Pro every 3 months. The most recent releases landed on October 8, 2026 and October 5, 2026 respectively.
| Parameter | Pressures | Timer 555 Calculator Pro |
|---|---|---|
| Price | $0.99 | $0.99 |
| Rating | 5.0 (2 ratings) — better | 4.7 (3 ratings) |
| Positive reviews | 75.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 | 3 — better |
| Update frequency | Every 14 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 13.2 |
| Further details — not scored | ||
| Size | 21 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | LionsApp di Nallbati Elton | Siu Yuen Ho |
Customer experience
Pressures
Timer 555 Calculator Pro
In-app purchases
Pressures
No in-app purchases
Timer 555 Calculator Pro
No in-app purchases
Questions
Is Pressures free?
Is Timer 555 Calculator Pro free?
Which has better reviews, Pressures or Timer 555 Calculator Pro?
Do Pressures or Timer 555 Calculator Pro have ads?
Which is updated more often, Pressures or Timer 555 Calculator Pro?
Other comparisons
