Dri vs PRO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Dri
This utility app calculates essential drying environment variables. Input temperature and relative humidity to instantly get grains per pound (GPP). Advanced options allow calculation of vapor pressure and air dew point to material, with easy term definitions.
- Calculate grains per pound (GPP)
- Calculate vapor pressure
- Calculate air dew point to material
- Switch between F° and C°
- Easy-access term definitions
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Calculate drying environment variables quickly and easily with this all-new psychrometric calculator. Just enter temperature and relative humidity and it will instantly calculate grains per pound (GPP). Or use the Advanced section to calculate vapor pressure and air dew point to material. Switch between F° and C° modes. Features easy-access definitions for all terms.
PRO
Access comprehensive laboratory testing for environmental pollutants like mold, radon, and lead. This service is backed by certified professionals and offers simplified processing with bundled supplies and analysis fees.
- Mold testing
- Radon testing
- Lead testing
- Allergen testing
- Asbestos testing
- Drinking water analysis
- Certified professionals
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PRO-LAB® offers laboratory testing services for mold, radon, lead, allergen, asbestos, and drinking water pollutants. Staffed with Certified Indoor Air Quality Professionals, Radon Measurement Specialists, Chemists, PRO-LAB® has the knowledge and experience to assist in any environmental investigations. PRO-LAB® is the first laboratory to offer all lab supplies bundled together with the lab analysis fees for simplified processing.
Screenshots
Verdict
The clearest difference is rating: PRO at 4.9 against Dri's 3.6. PRO also leads on update cadence (every 2 weeks vs every 13 months) and ratings volume (110 vs 12). Dri's advantage is review sentiment (63% vs 30%) and device support (3 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
PRO holds the better App Store score, 4.9 against 3.6. That said, the two scores are not equally well evidenced: PRO has 110 ratings behind it against 12, so its average is the more settled of the two. Written reviews complicate that: 63% of Dri's written reviews are positive against 30% of PRO's, so the app with the better star average is not the one people write more warmly about.
Dri ships an update every 13 months, PRO every 2 weeks. The most recent releases landed on October 9, 2026 and October 29, 2026 respectively.
| Parameter | Dri | PRO |
|---|---|---|
| Price | Free | Free |
| Rating | 3.6 (12 ratings) | 4.9 (110 ratings) — better |
| Positive reviews | 62.5% of reviews — better | 30.0% of reviews |
| Number of ratings | 12 | 110 — better |
| Update frequency | Every 13 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 13.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 4 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Legend Brands | Professional Laboratories |
Customer experience
Dri
PRO
In-app purchases
Dri
No in-app purchases
PRO
No in-app purchases
