ContrastRx vs LnQ App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ContrastRx
Provides quick access to treatment regimens for life-threatening reactions to radiographic contrast agents. Includes clinical descriptions, visual examples, and treatment protocols, along with helpful calculators and information on nephrogenic systemic fibrosis.
- Treatment regimens for contrast reactions
- Clinical descriptions and pictorial examples
- eGFR calculator
- Pediatric dose calculator
- Steroid pretreatment regimens
- Nephrogenic systemic fibrosis overview
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This app provides quick access to treatment regimens for potentially life-threatening reactions that can occur with iodine or gadolinium radiographic contrast. Included are clinical descriptions, pictorial examples, sound clips, and treatment regimens for the various types of reactions. Also included are a pediatric dose calculator, an eGFR calculator, a self-assessment module, pretreatment medication regimens, and an overview of nephrogenic systemic fibrosis.
LnQ App
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LnQ helps alleviate staffing problems with radiology by tapping into the hidden capacity that already exists. Whether used internally within a group, across a number of friendly groups, or as an open market solution, LnQ offers a more user friendly, cost effective, and less burdensome solution than most organization's current processes. We have created a network linking radiologists who have extra capacity to the larger medical market of radiology groups, hospitals and imaging centers wanting extra help. We have eliminated the middle man driving up price, adding complexity, and decreasing individual radiologist reimbursement. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
ContrastRx and LnQ App are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
ContrastRx ships an update every 3 weeks, LnQ App every 2 weeks. The most recent releases landed on September 28, 2026 and September 30, 2026 respectively.
| Parameter | ContrastRx | LnQ App |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (9 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 9 — better | — |
| Update frequency | Every 3 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 9 MB | 36 MB |
| Age rating | 17+ | 4+ |
| Developer | Mayo Clinic | LnQ, Inc |
In-app purchases
ContrastRx
No in-app purchases
LnQ App
No in-app purchases









