Gymboss BLACKBU Stopwatch
- Stopwatch
- Black / Blue
- 1.2 ounces
- Better rated than 72%
- More reviewed than 96%
A lightweight, purpose-built stopwatch worth considering if a dedicated timer fits your routine better than a phone app.
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How it ranks among the 48 stopwatches we track
4.5★ across 5,500 Amazon ratings, Bayesian-smoothed toward the category average.
5,500 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
600+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 48 stopwatches we track - how the scorecard works · full stopwatches data report. Confidence: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The Gymboss BLACKBU is a small stopwatch built for timing workouts, sets, and intervals. At just 35 grams it stays easy to carry, and it comes in a black and blue color scheme.
Gymboss built its name on gym-side interval timers, and this stopwatch model keeps that same pocket-size footprint. Listing data does not break down button layout or battery type, so buyers relying on precise timing should confirm those details before ordering. What is documented is the weight and color, both aimed at making the unit easy to carry during a workout.
- Weighs 35 grams
- Black and blue color
- Fitness stopwatch category
- Compact size
Who it's for
Suits lifters, runners and circuit trainers who want a dedicated timing device rather than relying on a phone screen mid-set. Not the pick for anyone who needs multi-function features confirmed in writing before buying.
Strengths and trade-offs
Drawn from this product's published specifications.
- Very light at 35 grams
- Compact size for carrying during training
- No button or battery details listed
- Single black and blue color option
Performance notes
The listed spec sheet is limited to weight and color, so day to day timing behavior is not detailed here. At 35 grams the unit is light enough to carry without adding noticeable bulk during a workout.
Specifications
| Brand | Gymboss |
|---|---|
| Color | Black / Blue |
| Item Weight | 1.2 ounces |
Other Gymboss stopwatches
How it compares
This product against the closest alternatives we track in stopwatches.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Gymboss BLACKBU StopwatchThis product | 4.5 / 5 | 5,500 | 4.3 / 5 |
| ACCUSPLIT 12440191 StopwatchACCUSPLIT | 4.5 / 5 | 3,500 | 4.3 / 5 |
| Learning Resources Simple 3 Button StopwatchLearning | 4.5 / 5 | 3,000 | 4.3 / 5 |
| Sports YS-802 StopwatchSports | 4.2 / 5 | 2,000 | 4.2 / 5 |
| Digital YS-802C StopwatchDigital | 4.3 / 5 | 1,400 | 4.1 / 5 |
Similar stopwatches from other brands
Questions about the Gymboss stopwatches
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How much does the Gymboss BLACKBU weigh?
It weighs 35 grams according to the listing.
What color options are available?
It comes in black and blue.
Is this a stopwatch or a full interval timer?
The listing categorizes it as a stopwatch; specific function details are not included in the available data.