CSS Calculator Pro vs BYB Chrono
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CSS Calculator Pro
This application helps swimmers learn and calculate their critical swim speed and sprint distance index. It also allows users to predict their race times based on their performance metrics.
- Learn critical swim speed test
- Calculate critical swim speed
- Calculate sprint distance index
- Predict race time
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With this simple app you will - Learn how to perform critical swim speed test - Calculate your critical swim speed and sprint distance index - Predict your race time
BYB Chrono
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BYB Chrono lets you track and compare your times in the most efficient and easy way. It features a high-accuracy multi-constellation GPS with a 25Hz update rate. It's possible to run the system in three different configurations: • Only GPS • GPS + Speed sensor • GPS + External trigger • GPS + Speed sensor + External trigger
Screenshots
Verdict
The clearest difference is update cadence: CSS Calculator Pro at every 2 weeks against BYB Chrono's monthly. CSS Calculator Pro also leads on iOS requirement (8.1 vs 15.1). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
CSS Calculator Pro ships an update every 2 weeks, BYB Chrono monthly. The most recent releases landed on October 8, 2026 and September 29, 2026 respectively.
| Parameter | CSS Calculator Pro | BYB Chrono |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| Update frequency | Every 2 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 8.1 — better | 15.1 |
| Further details — not scored | ||
| Size | 2 MB | 49 MB |
| Age rating | 4+ | 4+ |
| Developer | Alexey Ovod | BYB Tech |
In-app purchases
CSS Calculator Pro
No in-app purchases
BYB Chrono
No in-app purchases
Questions
Is CSS Calculator Pro free?
Is BYB Chrono free?
Do CSS Calculator Pro or BYB Chrono have ads?
Which is updated more often, CSS Calculator Pro or BYB Chrono?
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