JMGO O2S Ultra
A compact, bright triple laser UST for replacing a TV in a living room with some daylight. Its very short throw suits shallow stands where other USTs won’t fit.
Amazon $2,399 JMGO $2,199$2,199
The JMGO O2S Ultra rates 4.7 among ultra short throw projectors; the Optoma UHD35STx rates 3.8 among 4K ones. The Optoma UHD35STx costs $900 less ($1,299 vs $2,199).
Optoma UHD35STx
#21 in 4KFull review
A short throw 4K gaming projector for small rooms where the projector has to sit close to the screen.
Amazon $1,299$1,299
Prices were last checked October 29, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
These two sit in different type classes (ultra short throw and 4K), and each is scored against the reference points for its own class, so a rating says how well each does among its own type peers. How we rank explains each factor.
| Factor weight | JMGO O2S Ultra | Optoma UHD35STx |
|---|---|---|
| Overall rating | 4.7/5 | 3.8/5 |
| Brightness 25% | 92 3,600 ISO lumens | 95 3,600 ANSI lumens |
| Value 15% | 93 $0.61 per lumen | 96 $0.36 per lumen |
| Resolution 10% | 100 4K (pixel shift) | 100 4K (pixel shift) |
| Streaming 15% | 100 Google TV with licensed Netflix | 0 no built-in apps; needs a streaming stick |
| Setup 10% | 100 Autofocus, auto keystone | 0 Manual focus and keystone |
| Light life 10% | 100 30,000 hour RGB laser | 69 15,000 hour lamp |
| Gaming 10% | 83 15 ms input lag | 100 4 ms input lag |
| Warranty 5% | 0 1-year warranty | 0 1-year warranty |
Independent measurements
JMGO O2S Ultra
| Tested by | Brightness | Input lag | Contrast | Conditions |
|---|---|---|---|---|
| The Smart Home Hookup: Best UST Projector of 2025 | 4,081 lm | - | - | 4,081 lumens in Dynamic mode with fans at full speed (poor color); 2,454 lumens in its more accurate modes. Input lag stayed under 50 ms at 4K/60 with keystone on; no figure given. |
Optoma UHD35STx
No independent test published yet.
Specifications
| JMGO O2S Ultra | Optoma UHD35STx | |
|---|---|---|
| Picture | ||
| Brightness | 3,600 ISO | 3,600 ANSI |
| Native resolution | 1920 x 1080 (1080p) | 1920 x 1080 (1080p) |
| Picture resolution | 4K (pixel shift from 1920x1080) | 4K (pixel shift from 1920x1080) |
| Display | DLP | DLP |
| Light source | RGB laser | lamp |
| Light source life | 30,000 hours | 15,000 hours |
| HDR | Dolby Vision, HDR10 | HDR10, HLG |
| Color gamut | 110% BT.2020 | - |
| Native contrast | 4,000:1 | - |
| Dynamic contrast | 3,000,000:1 | 1,000,000:1 |
| Placement | ||
| Throw | Ultra short throw (0.2:1) | Short throw (0.5:1) |
| Largest image | 150 in | 300 in |
| Autofocus | Yes | No |
| Auto keystone | Yes | No |
| Obstacle avoidance | - | No |
| Auto screen fit | - | No |
| Optical zoom | None | None |
| Streaming and gaming | ||
| Built-in apps | Google TV, licensed Netflix | None |
| Input lag | 15 ms | 4 ms |
| Top refresh rate | 120 Hz | 240 Hz |
| HDMI ports | 2 | 2 |
| eARC | Yes | - |
| Speakers | 20 W | 10 W |
| Build | ||
| Battery | None | None |
| Fan noise | 26 dB | 28 dB |
| Power | 240 W | 320 W |
| Dimensions | 12.3 x 11.4 x 5.5 in (312 x 290 x 140 mm) | 12.4 x 10.63 x 4.65 in (W x D x H) |
| Weight | 9.9 lb | 7.7 lb |
| Warranty | 1 years | 1 years |
| Released | 2025-10 | 2022-09 |