# Drug Half-Life Calculator vs Lenses Prescription

> Drug Half-Life Calculator vs Lenses Prescription compared on installs, downloads, ratings, updates, compatibility and support. Lenses Prescription comes out ahead, winning 6 of 6 head-to-head checks against Drug Half-Life Calculator.

**Lenses Prescription comes out ahead, winning 6 of 6 head-to-head checks against Drug Half-Life Calculator.** Choose Lenses Prescription if you care most about active installs, downloads (30 days) and download trend.

| | Drug Half-Life Calculator | Lenses Prescription |
|---|---|---|
| Active installs | 10+ | 70+ ✅ |
| Downloads (30 days) | 40 | 147 ✅ |
| Download trend | +42.9% | +69% ✅ |
| Rating | — | — |
| Reviews | 0 | 0 |
| Health score | 23/100 | 56/100 ✅ |
| Last updated | 14 years ago | 5 days ago ✅ |
| Tested up to | WP 3.5.2 | WP 6.9.10 ✅ |
| Support resolved | — | — |
| Requires PHP | Any | Any |
| First released | Aug 2012 | Jan 2020 |

## Frequently asked questions

### Which is better, Drug Half-Life Calculator or Lenses Prescription?
Lenses Prescription comes out ahead, winning 6 of 6 head-to-head checks against Drug Half-Life Calculator.  Choose Lenses Prescription if you care most about active installs, downloads (30 days) and download trend.

### Is Drug Half-Life Calculator more popular than Lenses Prescription?
Lenses Prescription is the more popular of the two with 70+ active installs, compared with 10+ for Drug Half-Life Calculator.

### Can I use Drug Half-Life Calculator and Lenses Prescription together?
Both plugins cover prescription, so most sites only need one. Running two plugins that do the same job can cause conflicts and slow your site down — pick the one that fits best and remove the other.

### Are Drug Half-Life Calculator and Lenses Prescription free?
Yes. Both are free to download from the official WordPress.org plugin directory. Either may also offer paid upgrades from its developer.


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