Price (USD)
Hydrology9 edgeHydrology9
$199
PAX FOUR
$250
Hydrology9 is typically around $51 lower.
Vaporizer Comparison
Hydrology9 vs PAX FOUR
Side-by-side specs, pricing context, and clear decision guidance.
Hydrology9
Cloudious9 $199
VS
PAX FOUR
PAX Labs $250
Editorial Summary
Hydrology9 and PAX FOUR are both portable / electronic vaporizers, but they target different priorities. Hydrology9 is usually the lower-cost pick at $199, around $51 below PAX FOUR. Heat-up speed is broadly similar between the two.
Specs Compared
24
Different Specs
22
Shared Specs
2
Overall Overlap
8%
Shared Traits
Portable Electronic
Head-to-Head Highlights
A quick snapshot of the specs people usually care about first.
Heat-Up Time
Close callHydrology9
~1 minute
PAX FOUR
55-70 seconds
Both devices are in a similar heat-up range.
Heating Style
Close callHydrology9
Conduction
PAX FOUR
Hybrid (conduction and convection)
Heating style differs, which can impact flavor and extraction behavior.
Key Differences at a Glance
Top specs where these two devices diverge.
Price (USD)
Hydrology9
$199
PAX FOUR
$250
Heating Type
Hydrology9
Conduction
PAX FOUR
Hybrid (conduction and convection)
Heat Up Time
Hydrology9
~1 minute
PAX FOUR
55-70 seconds
Temperature Range
Hydrology9
250°F-430°F
PAX FOUR
190-220°C (374-428°F)
Chamber Capacity
Hydrology9
~0.5 grams
PAX FOUR
~0.3g
Battery Type
Hydrology9
Internal
PAX FOUR
Internal lithium-ion
Battery Capacity
Hydrology9
2000mAh
PAX FOUR
2800mAh
Charging
Hydrology9
Micro USB
PAX FOUR
USB-C
Charge Time
Hydrology9
~2 hours
PAX FOUR
~90 minutes
Dimensions
Hydrology9
~4.5 x ~17.5cm
PAX FOUR
108 x 36 x 29mm
Choose Hydrology9 if...
- You want the lower listed entry price ($199 vs $250).
- You prefer a conduction heating profile.
- Your usage leans toward conduction sessions.
Typical price
$199
Sold by To the Cloud Vapor Store
Choose PAX FOUR if...
- You prefer a hybrid (conduction and convection) heating profile.
- Your usage leans toward hybrid and discrete sessions.
- You prefer PAX FOUR's overall feature mix and form factor.
Typical price
$250
Sold by To the Cloud Vapor Store
Prices are read automatically from retailer pages; confirm the price at checkout. Some links are affiliate links, which support Thermal Extractions at no extra cost to you.
Spec Comparison Table
Direct comparison of every spec from each device profile.
22 differ 2 shared
| Specification | Hydrology9 | PAX FOUR |
|---|---|---|
| Price (USD) | $199 | $250 |
| Device Type | Portable | Portable |
| Heating Type | Conduction | Hybrid (conduction and convection) |
| Heat Up Time | ~1 minute | 55-70 seconds |
| Temperature Range | 250°F-430°F | 190-220°C (374-428°F) |
| Chamber Capacity | ~0.5 grams | ~0.3g |
| Battery Type | Internal | Internal lithium-ion |
| Battery Capacity | 2000mAh | 2800mAh |
| Battery Life | — | Up to 5 sessions, about 50 minutes of run time |
| Charging | Micro USB | USB-C |
| Charge Time | ~2 hours | ~90 minutes |
| Dimensions | ~4.5 x ~17.5cm | 108 x 36 x 29mm |
| Weight | — | 125 grams |
| Power Adjustment | Modular - 5 stage | Four preset heat modes (purple, green, yellow, orange) |
| Chamber Material | Ceramic | Stainless steel |
| Concentrate Support | — | No (not compatible with the PAX Concentrate Insert) |
| Brand | Cloudious9 | PAX Labs |
| Adjustable Airflow | — | No (flat and raised mouthpieces change the draw) |
| Display Type | — | LED petals |
| Manufacturer | — | PAX Labs, Inc (model X410) |
| Release Date | 2017 | 2026 |
| Session Style | Session | Session |
| Warranty | 2 years | 2 years, plus 1 year when registered within 30 days |
| Water Filtration | Yes | — |
Comparison FAQs
What is the biggest difference between the Hydrology9 and the PAX FOUR?
The biggest practical difference is heating approach: Hydrology9 runs conduction while PAX FOUR runs hybrid (conduction and convection). That changes flavor delivery, vapor density, and how the device responds to slow versus fast draws.
Which is cheaper, the Hydrology9 or the PAX FOUR?
Hydrology9 is the cheaper option at $199 compared with $250 for the PAX FOUR, about $51 less. Live retailer pricing can shift, so confirm before buying.
What's the difference in heating between the Hydrology9 and the PAX FOUR?
Hydrology9 uses conduction heating, while the PAX FOUR uses hybrid (conduction and convection). Heating style influences flavor profile, vapor density, and how forgiving the device is to draw technique.
Does the Hydrology9 or the PAX FOUR hold more flower?
Hydrology9 has the larger chamber at ~0.5 grams, versus ~0.3g on the PAX FOUR. A bigger bowl means fewer reloads on long sessions; a smaller one suits microdosing and quicker bowls.
Which heats up faster, the Hydrology9 or the PAX FOUR?
Heat-up times are very close: ~1 minute on the Hydrology9 and 55-70 seconds on the PAX FOUR. The real-world difference will be hard to notice mid-session.
Which charges faster, the Hydrology9 or the PAX FOUR?
PAX FOUR fully charges in ~90 minutes, ahead of ~2 hours on the Hydrology9.
Which is more discreet, the Hydrology9 or the PAX FOUR?
PAX FOUR is the better pick if low-profile use matters. It's tagged as stealth or pocket-friendly in our database, while the Hydrology9 is more conspicuous in hand and harder to keep out of sight.
Need a different matchup?
Jump into the comparison hub to pick any two devices and open a canonical side-by-side page.