Updated September 30, 2026 · SmartHomeCue Editorial Team
Alen Air Purifiers vs Dr.Prepare
Alen Air Purifiers vs Dr.Prepare: the differences
| Compare | Alen Air Purifiers ReviewVisitVisit |  Dr.Prepare |
|---|---|---|
| Reference models | BreatheSmart 75i, BreatheSmart 45i, BreatheSmart 35i | DAP02 HEPA Air Purifier, DAP01 HEPA Air Purifier with Pet Mode, DAP03H HEPA Air Purifier, DR.PREPARE 38 Pints Home Dehumidifier |
| Price from | $149 | $19.99Lower |
| Clean air delivery rate (m³/h) | 637.125Higher | 300 |
| Room size (m²) | 260.13 | 278.7Higher |
| Quietest noise level (dB) | 25 | 20Lower |
| Power use (W) | 1.36 to 55Lower | 200 |
| Filter cost per year | $79.20 to $99 | Not confirmed |
| Filter change interval | 12 to 15 months | Not confirmed |
| Extraction per day (l/day) | Not confirmed | 17.98 |
| Extraction test conditions | Not confirmed | 95F, RH 90% |
| Water tank (l) | Not confirmed | 2 |
Same on both: Mobile app (Yes), Warranty (1 year), Markets (US).
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Key differences
- Dr.Prepare scores higher overall: 9.2 vs 8.9.
- Price from is lower at Dr.Prepare: $19.99 vs $149.
- Clean air delivery rate (m³/h) is higher at Alen Air Purifiers: 637.125 vs 300.
- Room size (m²) is higher at Dr.Prepare: 278.7 vs 260.13.
- Quietest noise level (dB) is lower at Dr.Prepare: 20 vs 25.
- Power use (W) is lower at Alen Air Purifiers: 1.36 to 55 vs 200.
- Support channels: only Alen Air Purifiers offers Phone.
- Support channels: only Dr.Prepare offers Email.
- Products: only Dr.Prepare offers Dehumidifier, Fan.
- Filter types: only Alen Air Purifiers offers Ioniser.
Our verdict on each
Alen Air Purifiers
Alen Air Purifiers suits buyers who want a single machine covering a large open floor and will keep it running for years. The top BreatheSmart purifier delivers 637.125 m³/h of clean air delivery for a 260.13 m² room, and the entry tower purifier opens the range at $149.
Dr.Prepare
Dr.Prepare suits US buyers on a budget who want purifier, dehumidifier and fan products from a single seller, with entry pricing of $19.99 that ranks 2 of 76 brands. Warranty cover of 1 year and email-led support keep it a value pick rather than a long term choice.
Score breakdown
| Area | Alen Air Purifiers | Dr.Prepare |
|---|---|---|
| Cost | 8.8Entry at $149 and filters at $79.20 to $99 a year, so the purchase price is the expensive part. | 10.0HigherA $19.99 starting point puts the brand at 2 of 76 on entry price. |
| Offer | 8.9Higher637.125 m³/h of air delivery, 260.13 m² of coverage and hepa h13, carbon and ioniser inside 12 to 15 months. | 8.8purifier, dehumidifier and fan span purifier, dehumidifier and fan, with 300 m³/h clean air delivery, a mobile app and 1 year cover. |
| Trust | 8.8HigherAlen Corporation is named as the legal entity, with 1 year cover and support on phone and help centre. | 8.3Founded in 2018, support runs on email and help centre and the stated market is US. |
Where they rank in our lists
| Ranking | Alen Air Purifiers | Dr.Prepare |
|---|---|---|
| Air purifiers | 7 of 71 | 2 of 71 |
How the counts compare
| Fact | Alen Air Purifiers | Dr.Prepare |
|---|---|---|
| Price from | $149 | $19.99 |
| Clean air delivery rate (m³/h) | 637.125 | 300 |
| Room size (m²) | 260.13 | 278.7 |
| Quietest noise level (dB) | 25 | 20 |
| Power use (W) | 1.36 to 55 | 200 |
| Warranty | 1 year | 1 year |
If neither fits
Lab Charge has power use (w) at 1, against 1.36 to 55 for Alen Air Purifiers and 200 for Dr.Prepare.
Lab Charge reviewSources behind this comparison
Alen Air Purifiers
- alen.com: 17 facts, checked September 30, 2026
Dr.Prepare
- drprepare.com: 16 facts, checked September 30, 2026
Every fact side by side
| Fact | Alen Air Purifiers | Dr.Prepare |
|---|---|---|
| Products | Purifier | Purifier, Dehumidifier, FanCovers more |
| Filter types | Hepa h13, Carbon, IoniserCovers more | Hepa h13, Carbon |
| Certifications | Energy star | Not confirmed |
| Legal entity | Alen Corporation | Not confirmed |
| Headquarters | United States | Not confirmed |
| Founded | Not confirmed | 2018 |
| Support channels | Phone, Help centre | Email, Help centre |
Home appliances
| Fact | Alen Air Purifiers | Dr.Prepare |
|---|---|---|
| Capacity | Not confirmed | 40L |
| Dimensions | Not confirmed | 69.2 x 45.3 x 45 cm |
Where each stands against the rest
| Fact | Alen Air Purifiers | Dr.Prepare | Median |
|---|---|---|---|
| Price from | $149above the median | $19.99lowest quarter | $109.99 |
| Clean air delivery rate (m³/h) | 637.125above the median | 300below the median | 424.925 |
| Room size (m²) | 260.13highest quarter | 278.7highest quarter | 124 |
| Filter cost per year | $79.20 to $99below the median | Not confirmed | $79.60 |
| Filter change interval | 12 to 15 monthshighest quarter | Not confirmed | 12 |
| Quietest noise level (dB) | 25at the median | 20lowest quarter | 25 |
Median across 65 listed brands.
Pros and cons
Alen Air Purifiers
Pros
- 637.125 m³/h of clean air delivery with 260.13 m² of stated coverage, so a single unit handles a big open room.
- Filters last 12 to 15 months and cost $79.20 to $99 a year, which spreads the running cost over fewer purchases.
- Runs at 25 dB on the quietest setting, so a machine in a bedroom does not need switching off at night.
Cons
- Entry price of $149 ranks 49 of 76 brands, so this is not the cheapest way into the category.
- The catalogue is limited to purifier, so Vornado Air or Daewoo Electricals suit a buyer who also wants a fan or a dehumidifier.
- Availability is listed for US alone, so a buyer elsewhere has less reason to choose this brand over Clarifion.
Dr.Prepare
Pros
- Entry pricing of $19.99 ranks 2 of 76 brands on starting price, so the floor is hard to undercut.
- A single seller covers purifier, dehumidifier and fan, and the reference range pairs HEPA purifier models with a home dehumidifier.
- The HEPA purifier with pet mode pairs 300 m³/h of clean air delivery with rated coverage of 278.7 m² and a noise floor of 20 dB.
Cons
- Warranty cover on the purifier line is 1 year, which is short for a machine expected to run for years.
- Support runs on email and help centre only, so anyone with a fault will be writing in rather than calling.
- Clean air delivery of 300 m³/h ranks 32 of 47 brands, well below the mid-range purifiers here.
Who each suits
Alen Air Purifiers
Who it suits
- US buyers who want a single purifier sized for a large open room rather than a small bedroom.
- Households that want app control alongside phone and help centre support from the maker.
- Owners who plan to keep one unit running long term, since 12 to 15 months between filter changes spreads the cost of $79.20 to $99 a year over fewer purchases.
Who should look elsewhere
- Buyers who want fans and humidifiers as well as purifiers, since Vornado Air covers purifier, humidifier and fan.
- Homes that also need drying, since Daewoo Electricals covers purifier, dehumidifier and fan.
- Pet odour cases, since Clarifion lists a pet smell neutralizer among its models.
Dr.Prepare
Who it suits
- US households wanting a purifier or dehumidifier at a low entry price
- Renters and new buyers who will swap filters rather than run a machine for years
- Shoppers who want a single seller for purifier, dehumidifier and fan products
Who should look elsewhere
- Shoppers who want a humidifier in the same basket, since Vornado Air lists purifier, humidifier and fan and Dr.Prepare does not
- Buyers who need a phone line, since Dr.Prepare support runs on email and help centre only
- Buyers after a purifier only specialist, since Clarifion lists purifier while Dr.Prepare spreads across purifier, dehumidifier and fan
Current offers
Dr.Prepare
Current offer
Discount code
5% first-order discount for new members: 5%
Code WELCOME5, new members only, can be used once
Source, checked September 30, 2026
Country by country
| Country | Alen Air Purifiers | Dr.Prepare |
|---|---|---|
| United States | Yes | Yes |
Questions about each
Alen Air Purifiers
How much does the cheapest Alen purifier cost?+
The entry tower purifier sets the entry point at $149. Filters for the top BreatheSmart model add $79.20 to $99 a year on top, so the yearly figure matters as much as the sticker price for anyone keeping the unit for years.
What do replacement filters cost and how often do they need changing?+
Filters for the top BreatheSmart model run $79.20 to $99 a year, and filters hold for 12 to 15 months between changes. That interval sits above the 6 months typical across the category, which is why the yearly figure reads as reasonable.
Dr.Prepare
How much does a Dr.Prepare air purifier cost?+
Purifiers start at $19.99. That entry point ranks 2 of 76 brands compared on starting price, which makes Dr.Prepare among the cheapest routes into a HEPA purifier. The reference range covers several HEPA purifier models, including a pet mode variant for homes with pets.
What warranty comes with a Dr.Prepare purifier?+
Warranty cover on the purifier line is 1 year. That is short next to the multi-year terms offered on some premium machines, so buyers who plan to run a purifier for a long stretch should assume a replacement cost outside the warranty period.
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