Rapsodo MLM2PRO vs Voice Caddie Swing Caddie SC4 Pro
Side-by-side comparison of specs, features, and pricing
Specs updated
Maintained by GolfSim Compare Team · specs sourced, prices from dated retailer checks · how we compare
Why Rapsodo MLM2PRO is better
- Spin measurement: Measured spin (with marked balls) (Measured spin (with marked balls) vs Estimated spin)
- Measured ball data: 5 of 9 ball metrics measured (vs 3) (5 of 9 vs 3 of 9)
- Measured club data: 3 of 5 club metrics measured (vs 1) (3 of 5 vs 1 of 5)
- Club data access: Club data available (paid) (Subscription required vs Not available)
- GSPro support: GSPro: supported (vendor sub required) (Supported (vendor sub required) vs No)
- Sim software: 2 more sim titles supported (3 titles vs 1 title)
Why Voice Caddie Swing Caddie SC4 Pro is better
- Subscription: No subscription needed for full function (Not required vs Required)
- 3-year cost: $600 cheaper over three years ($600 vs $1,200)
- Battery life: 6 hours longer battery (10 hr vs 4 hr)
- Built-in display: Built-in display (LCD readout vs None)
Specs Comparison
Rapsodo MLM2PRO $600 vs Voice Caddie Swing Caddie SC4 Pro $600
| Specification |  Rapsodo MLM2PRO $600 |  Voice Caddie Swing Caddie SC4 Pro $600 |
|---|---|---|
| Price | ||
| Price | $600 | $600 |
| Measurement | ||
| Tracking technology | Radar + camera fusion | Doppler radar |
| Radar type | Single Doppler | Single Doppler |
| Camera frame rate (fps) | 240 | — |
| Spin measurement | Marked balls only | Estimated |
| Marked balls | Rapsodo RPT balls | Not required |
| Accuracy tier | Game-improvement | Game-improvement |
| Data points per shot | 15 | — |
| Ball data | ||
| Ball speed | Measured | Measured |
| Launch angle | Measured | Measured |
| Launch direction | Measured | Measured |
| Spin rate | Measured (marked ball) | Calculated |
| Spin axis | Measured (marked ball) | Calculated |
| Carry distance | Calculated | Calculated |
| Total distance | Calculated | Calculated |
| Apex height | Calculated | Calculated |
| Descent angle | Calculated | Not reported |
| Offline distance | Calculated | — |
| Club data | ||
| Club speed | Measured | Measured |
| Attack angle | Measured | Not reported |
| Club path | Measured | Not reported |
| Face angle | Not reported | Not reported |
| Face to path | Not reported | Not reported |
| Dynamic loft | Not reported | Not reported |
| Impact location | Not reported | Not reported |
| Smash factor | Calculated | Calculated |
| Club data unlock | Subscription required ($200/yr) | Not available |
| Space & environment | ||
| Environment | Indoor + outdoor | Indoor + outdoor |
| Placement | Behind the ball | Behind the ball |
| Setback (ft) | 6.5 | 5 |
| Min ball flight (ft) | 8 | 10 |
| Min room depth (ft) | 14 | — |
| Lefty / righty | — | No repositioning |
| Installation | None (portable) | None (portable) |
| Sim software | ||
| Simulator capable | ✓ Yes | ✓ Yes |
| GSPro support | Supported (vendor sub required) | No |
| E6 Connect support | Supported (vendor sub required) | Native |
| Awesome Golf support | Supported (vendor sub required) | — |
| FSX Play support | No | No |
| First-party software | Rapsodo Courses (30,000+ simulated courses + 2 virtual ranges, Premium) | E6-bundled; Voice Caddie S app 3D driving range (practice) |
| Sim software | E6 Apex | OptiShot Orion |
| Included sim content | 45-day Premium trial included with purchase. Plugged In Golf (2023-12) recorded an included E6 Connect code unlocking five courses and a short Awesome Golf trial; not shown on the 2026-09-14 official page. | Complimentary E6 Connect package: 5 courses + 1 driving range (Aviara Golf Club, Bandon Dunes, Stone Canyon Club, Sanctuary, Wade Hampton), no subscription. Official page says E6 is 'available on iOS and PC'; Breaking Eighty (2026-03) reports the bundled 5-course license as mobile-only. Full E6 library via optional E6 subscription (third-party cost). E6 integration was broken at the December 2024 launch (PlayBetter) but is documented working in 2026 reviews. |
| Subscription | ||
| Subscription (per year) | $200/yr | None |
| Works without subscription | Official membership page (2026-09-14): the device works without Premium, but 'speed training, club data and full-course access require premium membership'. Premium gates the 15-metric set (incl. spin rate/axis, club path, angle of attack), Rapsodo Courses, third-party sim access (GSPro/E6/Awesome Golf), Impact Vision, R-Cloud 10K shot library, R-Speed, and Combine. | Complete without any subscription: 8 metrics on the built-in display with voice output standalone; free Voice Caddie S (VCS) app adds the 3D range, spin axis/sidespin/backspin and dispersion. Only optional spend is expanding the E6 course library (third-party title cost). |
| Subscription trial | 45-day Premium trial ('The free trial of the MLM2PRO Premium Membership is 45 days'; auto-renews unless cancelled via R-Cloud) | — |
| Connectivity & apps | ||
| Apps | iOS, Android | iOS, Android |
| Built-in display | None | LCD readout |
| Screen mirroring | Casting (AirPlay/Chromecast) | — |
| Connectivity | — | Bluetooth |
| Offline mode | — | ✓ Yes |
| Physical & power | ||
| Weight (lb) | — | 1.3 |
| Dimensions (in) | — | 4.88 x 7.59 x 1.14 in |
| Battery life (hours) | 4 | 10 |
| Power source | Rechargeable battery | Rechargeable battery |
| Charging port | USB-C | — |
| Alignment | — | Alignment stand |
| In the box | MLM2PRO unit, tripod, carrying case, USB-C charging cable, RPT 3-ball sleeve (Titleist Pro V1 or Callaway Chrome Tour), quick start guide, 45-day Premium trial | SC4 Pro launch monitor, magnetic remote control, USB cable, user manual, alignment stand, E6 Connect 5-course license |
| Warranty | ||
| Warranty (months) | — | 12 |
Buy the Rapsodo MLM2PRO
Buy the Voice Caddie Swing Caddie SC4 Pro
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These two track the ball differently: the Rapsodo MLM2PRO is a radar-camera fusion unit, while the Voice Caddie Swing Caddie SC4 Pro is Doppler-radar, per their recorded specs. What that difference means for spin, space, and indoor use is covered in our guide to radar vs camera launch monitors .