Timer 555 Calculator Pro vs COLOP Verification App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
COLOP Verification App
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Feel confident about the authenticity of an important document, regardless if it is displayed on your screen or printed on paper. Demand the issuer to seal the document with the COLOP e-mark secure solution. With this verification app, you can verify the seal and its context within seconds. Retrieve all the following details from a blockchain database: - Authorized Organization - Authorized Officer - ID Number of the stamp device - Location where the stamp was created - Date, time and number of the stamp - Notes made during the stamp creation - Original image of the document
Screenshots
Verdict
The clearest difference is price: COLOP Verification App at Free against Timer 555 Calculator Pro's $0.99. COLOP Verification App also leads on update cadence (every 6 weeks vs every 3 months). On ads, in-app purchases, 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
COLOP Verification App is free to download; Timer 555 Calculator Pro costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Timer 555 Calculator Pro ships an update every 3 months, COLOP Verification App every 6 weeks. The most recent releases landed on October 23, 2026 and October 11, 2026 respectively.
| Parameter | Timer 555 Calculator Pro | COLOP Verification App |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.7 (3 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 3 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13.2 | 13.1 — better |
| Further details — not scored | ||
| Size | 3 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Siu Yuen Ho | Colop Digital GmbH |
In-app purchases
Timer 555 Calculator Pro
No in-app purchases
COLOP Verification App
No in-app purchases
Questions
Is Timer 555 Calculator Pro free?
Is COLOP Verification App free?
Do Timer 555 Calculator Pro or COLOP Verification App have ads?
Which is updated more often, Timer 555 Calculator Pro or COLOP Verification App?
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