PRN Graph vs Topical skin therapy
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
PRN Graph
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The Perined-Hoftiezer birth weight curves show the optimal birth weight (and its distribution) of children born at the corresponding gestational age. The curves are differentiated by gender. Identifying small children is important for reducing mortality and morbidity. These curves are based on data from the perinatal registration of newborns in the Netherlands. The curves are normative and therefore developed based on a low-risk population without known risk factors for fetal growth restriction. All multiple pregnancies, inductions, and primary cesarean sections were also excluded to approximate the optimal birth weight for each gestational age. More information can be found at www.perined.nl and in the following scientific publications: Hoftiezer L et al. Am J Obstet Gynecol. (2019) From population reference to national standard: new and improved birthweight charts. 10.1016/j.ajog.2018.12.023 Hoftiezer L et al. Eur J Pediatr. (2016) Defining small-for-gestational-age: prescriptive versus descriptive birthweight standards. 10.1007/s00431-016-2740-8 The curves were compiled by Liset Hoftiezer, guided by a working group consisting of representatives from various professional groups, birth care organizations, and researchers: Joyce Dijs-Elsinga, Jeroen van Dillen, Michel Hof, Marije Hogeveen, Chantal Hukkelhoven, Karline van de Kamp, Richard van Lingen, Alieke de Roon-Immerzeel, Rosalinde Snijders, Viki Verfaille, Ger de Winter, and Koos Zwinderman. The research position was financially supported by the Isala Innovation & Science Fund and Nutricia Early Life Nutrition; there has been no interference with the content of the project. ยฉ 2024 Perined
Topical skin therapy
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The "Topical skin therapy" app provides instructions and information on the treatment with ointments. This app has been developed by Internetdiensten Nederland on behalf of the Dermatology/Allergology department of UMC Utrecht. The "Topical skin therapy" app provides step-by-step instructions and information on the treatment with corticosteroid creams and emollient creams for (chronic) skin conditions.
Screenshots
Verdict
The clearest difference is iOS requirement: Topical skin therapy at 9.0 against PRN Graph's 16.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
PRN Graph ships an update every 3 months, Topical skin therapy every 2 months. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.
| Parameter | PRN Graph | Topical skin therapy |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Every 2 months โ better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.0 | 9.0 โ better |
| Further details โ not scored | ||
| Size | 6 MB | 49 MB |
| Age rating | 17+ | 17+ |
| Developer | Glamorous Goat B.V. | UMC Utrecht |
In-app purchases
PRN Graph
No in-app purchases
Topical skin therapy
No in-app purchases
Questions
Is PRN Graph free?
Is Topical skin therapy free?
Do PRN Graph or Topical skin therapy have ads?
Which is updated more often, PRN Graph or Topical skin therapy?
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