Castrol 2TRatio vs GPS Race Timer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Castrol 2TRatio
Easily calculate the precise oil-to-fuel ratio for your 2-stroke engines. This tool is perfect for motorcycles, boats, lawnmowers, and garden equipment, ensuring you use the correct mix as recommended by manufacturers.
- Calculate oil-to-fuel ratio
- Supports motorcycles, outboards, lawnmowers
- Adjustable fuel slider
- Adjustable ratio slider
- Metric/Imperial measurement switch
- Link to Castrol Lube guide
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Castrol 2TRatio Two Stroke Oil Ratio Selector calculates the oil to fuel ratio for 2 stroke engines With this handy application, you can quickly and easily calculate the Castrol 2-stroke oil to fuel ratio needed for your 2 stroke engines. Applicable for motorcycles, outboard motors, lawnmowers and garden equipment, this calculator determines the amount of oil to add to the fuel required based on the ratio as suggested by the engine manufacturer. To determine the oil required for the fuel needed, simply use the fuel slider to display the amount of fuel needed and use the Ratio Selector slider for the oil to fuel ratio. The Oil required is instantly displayed for the exact fuel to oil mix. Under settings, there is a switch between metric or Imperial measurements and a link to the Castrol Lube guide so you can check what oil is right for your engine.
GPS Race Timer
Accurately measure vehicle acceleration times like 0-60 mph and 1/4 mile using your iPhone's GPS. Set up timers beforehand and let the app automatically start measurements when speed targets are met or motion is detected. Save, export, and transfer your performance data easily.
- Measure 0-60 mph, 60-120 mph, 1/4 mile
- Automatic start detection
- Save and export results
- Preset and adjustable timers
- No extra hardware required
- Optional PRO version features
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Measure acceleration times such as 0–60 mph, 60–120 mph and 1/4 mile directly with your iPhone — accurately and without extra hardware. The app is designed so it doesn’t need to be operated while driving; you just set everything up beforehand while stationary. Measurements then start automatically — when the target speed is reached or when a start is detected. You can save results locally on your iPhone and, if needed, export them or transfer them to other devices. Preset timers: 60 ft, 1/8 mile, 1/4 mile, 1/2 mile, 1 mile, 0 – 60 mph, 0 – 120 mph, 50 – 75 mph, 60 – 120 mph, 0 – 100 km/h, 0 – 200 km/h, 80 – 120 km/h, 100 – 200 km/h. All timers are, of course, fully adjustable. The free version measures up to two times per run. How to use the app: Check the timer settings on the start screen. If everything looks good, place your iPhone in the car where it has good GPS reception and is held securely, then start the acceleration test. You can adjust the timer configuration in the Settings screen (just tap the relevant timer). Then return to the race screen and follow the previous instruction. Optional PRO version (in-app purchase): 1. Up to four timers in parallel (instead of two) 2. Precise determination of elevation differences 3. Simulation of a Sportsman start and reaction-time measurement 4. No ad banners
Screenshots
Verdict
The clearest difference is rating: GPS Race Timer at 4.5 against Castrol 2TRatio's 3.0. GPS Race Timer also leads on update cadence (every 7 months vs every 58 months) and ratings volume (2.7K vs 4). Castrol 2TRatio's advantage is review sentiment (76% vs 34%) and in-app purchases (none vs 1). On price 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. GPS Race Timer sells 1 one-off in-app purchase. Castrol 2TRatio asks for nothing beyond the download.
GPS Race Timer holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: GPS Race Timer has 2.7K ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 76% of Castrol 2TRatio's written reviews are positive against 34% of GPS Race Timer's, so the app with the better star average is not the one people write more warmly about.
Castrol 2TRatio ships an update every 58 months, GPS Race Timer every 7 months. The most recent releases landed on October 16, 2026 and October 17, 2026 respectively.
| Parameter | Castrol 2TRatio | GPS Race Timer |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (4 ratings) | 4.5 (2.7K ratings) — better |
| Positive reviews | 75.8% of reviews — better | 34.4% of reviews |
| Number of ratings | 4 | 2.7K — better |
| Update frequency | Every 58 months | Every 7 months — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 10.0 — better | 12.2 |
| Further details — not scored | ||
| Size | 15 MB | 50 MB |
| Age rating | 4+ | 4+ |
| Developer | Castrol Australia Pty Ltd | Thomas Hagenau |
Customer experience
Castrol 2TRatio
GPS Race Timer
Bugs and requests
Castrol 2TRatio
Not enough reviews yet to summarise bugs or requests.
GPS Race Timer
Reported bugs
4 issues- Timer doesn't reset properly
- App crashes on startup
- Significant GPS/speed detection delays
- Recorded times do not match actual performance
Requested features
4 requests- Add 60ft and 1/8 mile times
- Automatic start/stop of timer
- Manual start option for timer
- Improved accuracy and consistency
In-app purchases
Castrol 2TRatio
No in-app purchases
GPS Race Timer
- PRO$4.99
Questions
Is Castrol 2TRatio free?
Is GPS Race Timer free?
Which has better reviews, Castrol 2TRatio or GPS Race Timer?
Do Castrol 2TRatio or GPS Race Timer have ads?
Which is updated more often, Castrol 2TRatio or GPS Race Timer?
Other comparisons
