PRN Graph vs MEK
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
MEK
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De Menstruatie Educatie Kalender is een app ontwikkeld door een onderzoeksteam van het Amsterdam UMC. We ontwikkelen een manier om de relatie tussen bloedverlies, pijn en dagelijkse invloed van pijn van de menstruatie bij vrouwen te bepalen. Deze app bevindt zich momenteel in een evaluatiefase en kan alleen worden gebruikt na inschrijving, ondertekening van een toestemmingsformulier en samenwerking met het onderzoeksteam. Deze app kan niet worden gebruikt als een op zichzelf staande kalender.
Screenshots
Verdict
The clearest difference is update cadence: PRN Graph at every 3 months against MEK's every 15 months. On price, ads, in-app purchases and device support 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, MEK every 15 months. The most recent releases landed on September 8, 2026 and September 26, 2026 respectively.
| Parameter | PRN Graph | MEK |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months โ better | Every 15 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad, iPod โ better |
| Requires iOS | 16.0 | 15.6 โ better |
| Further details โ not scored | ||
| Size | 6 MB | 28 MB |
| Age rating | 17+ | 4+ |
| Developer | Glamorous Goat B.V. | ideact |
In-app purchases
PRN Graph
No in-app purchases
MEK
No in-app purchases







