Comparison

PRN Graph vs MEK

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

PRN Graph

Features
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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

About

MEK

Features
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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

PRN Graph4 screens
MEK4 screens

Verdict

The call

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

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.

Scorecard1 real difference ยท 5 level
PRN Graph versus MEK: the parameters behind the verdict, then further details
ParameterPRN GraphMEK
PriceFreeFree
Update frequencyEvery 3 months โ€” betterEvery 15 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad, iPod โ€” better
Requires iOS16.015.6 โ€” better
Further details โ€” not scored
Size6 MB28 MB
Age rating17+4+
DeveloperGlamorous Goat B.V.ideact

In-app purchases

None

PRN Graph

No in-app purchases

None

MEK

No in-app purchases

Questions

Is PRN Graph free?
PRN Graph is free to download, with no in-app purchases.
Is MEK free?
MEK is free to download, with no in-app purchases.
Do PRN Graph or MEK have ads?
Neither PRN Graph nor MEK shows ads.
Which is updated more often, PRN Graph or MEK?
PRN Graph ships an update every 3 months, and MEK every 15 months. Most recently, PRN Graph was updated on September 8, 2026 and MEK on September 26, 2026.

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