The data,
none of the gear.
Want an Arccos alternative without club sensors? Round Review gives you shot tracking, dispersion, and strokes gained from your voice and your phone. No sensors to screw into your grips, nothing to charge — and it knows the target and the feel behind each shot, which a sensor can't.
Two ways to track a round
Sensor systems like Arccos detect shots automatically — powerful, but it means hardware on every club. Round Review captures what you tell it, in your own words, from gear you already own.
| Sensor systems | GPS apps | Round Review | |
|---|---|---|---|
| Nothing to buy or install on your clubs | — | ✓ | ✓ |
| Hands-free capture | ✓ | — | ✓ |
| Dispersion & strokes gained | ✓ | — | ✓ |
| Knows your target & how it felt | — | — | ✓ |
| Talk through the round afterward | — | — | ✓ |
Sensor systems commonly run $200–$600 in hardware before the subscription. Round Review runs on the phone in your pocket and the watch on your wrist.
What you trade, and what you gain
Automatic capture is Arccos's strength — sensors log shots without you thinking about it. The tradeoff is the hardware tax and the fact that a sensor only knows where the ball went.
Round Review asks you to say the shot — a sentence after the swing — and in return it captures the things a sensor can't: the club you were torn on, the target you aimed at, and how the swing felt. That's the layer that turns a shot map into an explanation. And when you don't feel like talking, drop a pin on the map by hand, or scan your scorecard afterward and narrate the round on the drive home.
What the research says
Arccos's whole pitch is hands-free, automatic detection. A 2025 peer-reviewed study in the International Journal of Golf Science tested that claim directly — timing Arccos and a rival system, Shot Scope CONNEX, against a laser rangefinder and tape measure across 1,267 real shots on two UK golf courses.
The study's topline conclusion is favorable to both systems: strong correlations to the control measure (r ≥ 0.91) and a mean bias of one yard or less across every distance category. On the shots each system actually recorded, both are accurate. But "the shots it recorded" is doing a lot of work in that sentence — a meaningful share of shots weren't recorded at all:
"The Arccos system did not detect (i.e., no recognition within the smartphone application that a shot has been played) a total of 67 shots (5.3% of all shots) and the Shot Scope system had 3 undetected shots (0.2%)." — Hall et al., 2025, International Journal of Golf Science, 13(1)
The paper walks through what one of those misses actually does to a round's data:
"Arccos 1 recorded five shots on a particular hole … Arccos 2 recorded four shots on the same hole … The second shot went undetected on the Arccos 2 system resulting in an inaccurate score for that hole and an inaccurate distance measurement for shot 1 because it measured from shot 1 directly to shot 3." — Hall et al., 2025
And here's the methodology decision worth knowing about: those misses — and every shot they corrupted — were removed before the study calculated the accuracy numbers Arccos points to.
"The authors subsequently decided to remove all cases including an undetected shot from data analyses and all shots directly affected by an undetected shot, as they were not comparable and would have artificially interfered with the results. In total, 108 shots or 8.5% of the data set were removed from analysis for this reason." — Hall et al., 2025
In a real round, a missed shot doesn't get quietly excluded from your data — it just isn't there. The score for the hole is off, a club's average distance is skewed, and the study's own remedy is manual: reopen the app after the round and place the missed shot yourself on a heat map. Round Review doesn't promise automatic detection either. The difference is that when you tell it what happened, a miss can't happen silently — there's no shot to drop, because you're the one who logged it.
Hall, T. E. D., Willmott, A. G. B., Hynes, N. J., Wells, J. E. T., & Allen, P. M. (2025). The Validity and Reliability of Two Golf Performance-Tracking Global Positioning System (GPS) Devices. International Journal of Golf Science, 13(1), 103–121. golfsciencejournal.org/article/144587
Questions golfers ask
Is there an Arccos alternative without sensors?
Yes. Round Review tracks your game from your voice and your phone instead of club sensors. You say what happened after a shot and AI builds your shot map, dispersion, and strokes gained — there's nothing to screw into your grips, buy, or charge.
Can you get strokes gained without Arccos sensors?
Yes. Round Review computes strokes gained — off the tee, approach, short game, and putting — from shots you capture by voice, tap, or a scanned scorecard. No grip sensors are required to get the analytics.
Does Round Review auto-detect every shot like Arccos?
No — and that's the deliberate difference. Arccos uses sensors to detect shots automatically; Round Review captures the shots you tell it about. You give up automatic logging and gain context a sensor can't have: the club you were torn on, the target you aimed at, and how the swing actually felt.
Does Arccos actually detect every shot?
Not always. A peer-reviewed 2025 study found Arccos failed to detect 67 of 1,267 shots (5.3%) during testing — versus 3 shots (0.2%) for a manual-tap competitor. Those undetected shots, and any shots their absence corrupted, were excluded from the study's own accuracy analysis before it reported Arccos as valid and reliable. Round Review doesn't auto-detect shots either, but a miss can't happen silently — you tell it what happened, so nothing drops out of your data without you knowing.
How does the cost compare to Arccos?
Arccos pairs a set of club sensors with a subscription. Round Review has no hardware to buy at all — it runs on the phone in your pocket and the Apple Watch on your wrist. Sensor systems commonly run $200–$600 in hardware before any subscription; Round Review skips that entirely.
Which is better, Arccos or Round Review?
It depends on what you want. Arccos is a mature system built around automatic, sensor-based capture. Round Review is for golfers who don't want hardware on their clubs and who want the why behind each shot — intent and feel — captured in their own words. If hands-free automation matters most, Arccos fits; if you want the context and none of the gear, Round Review does.