1–4 on published sub-scores
EPAuto vs Ryobi tire inflator
Full names: EPAuto 12V DC Portable Air Compressor vs Ryobi P737D 18V ONE+ Cordless Inflator. Both units have been through the same bench protocol. EPAuto 12V DC Portable Air Compressor takes 1 of the five sub-scores we publish, Ryobi P737D 18V ONE+ Cordless Inflator takes 4. The specs and the trade-offs below are what actually separate them.
Every score and figure below comes from our linked reviews — this page adds no new tests.
EPAuto
EPAuto 12V DC Portable Air Compressor
A dependable emergency inflator at a price that makes sense for a spare-tire kit. Slow, loud and inaccurate on the dial, but it has survived 60 runs without failing.
Ryobi
Ryobi P737D 18V ONE+ Cordless Inflator
If you already own Ryobi ONE+ batteries, this is the most convenient inflator you can buy: digital preset, no cables, and enough runtime for a full set of tires on one 4.0Ah pack.
Sub-scores from our reviews
The five dimensions behind every overall score on this site, taken verbatim from each review. A dash means the review does not publish that sub-score.
| Dimension | EPAuto 12V DC Portable Air Compressor | Ryobi P737D 18V ONE+ Cordless Inflator |
|---|---|---|
| Inflation speed | 3.2 | 4.0 |
| Gauge accuracy | 3.1 | 4.8 |
| Build quality | 4.0 | 4.5 |
| Portability | 4.6 | 4.9 |
| Value | 4.8 | 4.5 |
| Overall score | 4.1 | 4.5 |
| Typical price | $24.99 | $39.97 (bare tool) |
Specifications both publish
| Spec | EPAuto 12V DC Portable Air Compressor | Ryobi P737D 18V ONE+ Cordless Inflator |
|---|---|---|
| Maximum pressure | 120 PSI | 150 PSI |
| Air flow | 1.0 CFM at 0 PSI | 0.57 CFM at 0 PSI |
| Power source | 12V DC cigarette plug, 10 ft cord | Ryobi 18V ONE+ battery (bare tool, no battery included) |
| Hose length | 3 ft | 20 in high-pressure hose |
| Duty cycle | 10 minutes on, 10 minutes off | Continuous use, thermally protected |
| Weight | 2.4 lb (1.09 kg) | 3.6 lb (1.63 kg) with a 4.0Ah battery |
| Included adapters | Presta adapter, ball needle, nozzle adapter, carry bag | Presta adapter, sports needle, high-flow nozzle |
Trade-offs with each
EPAuto 12V DC Portable Air Compressor
- Gauge read 3 to 4 PSI high, the worst accuracy in our test group
- 4 minutes 10 seconds for a routine 8 PSI top-up
- Very loud and noticeably buzzy in the hand
- Short 10 ft cord limits reach on longer vehicles
Ryobi P737D 18V ONE+ Cordless Inflator
- Sold as a bare tool — battery and charger cost extra if you are not already in the ONE+ system
- Slower than a battery-clamp 12V compressor on a completely flat tire
- Bulkier than a 12V inflator and heavier in the hand at 3.6 lb with a 4.0Ah pack
- The 1/4 in hose has no standard quick-release, so aftermarket accessories need an adapter
Which one, for whom
Choose the EPAuto 12V DC Portable Air Compressor if you weight value more heavily, and the lower price ($24.99 against $39.97 (bare tool)) matters.
Choose the Ryobi P737D 18V ONE+ Cordless Inflator if you weight inflation speed, gauge accuracy, build quality, portability more heavily.
Neither is a bad unit — both cleared the same protocol. Read the two full reviews before deciding: EPAuto 12V DC Portable Air Compressor review and Ryobi P737D 18V ONE+ Cordless Inflator review.