@ernstmul Profile picture

Ernst Mulders

@ernstmul

Web/app developer - Product Engineer @Appwrite - Side projects 🚁 @AirAssistApp (in Dutch @LifelinerApp) and ✈️ @WaterbomberApp

Joined June 2015
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Help saving lives with an app side project? Yes, yes that’s what I do! Want to know how I got there? You can find the interview on @IndieHackers 🙌🏻 indiehackers.com/post/tech/savi…


The AI that will take over your job

ernstmul's tweet image. The AI that will take over your job

Oh this is neat. I never look here. I think being in the lower percentile on crash rate is a good thing (don’t want to be in the 75th there) Also, I charge too little? (Probably due to a lot of low priced early subscribers) My 28day retention is also in the 75th 🔥

ernstmul's tweet image. Oh this is neat. I never look here.

I think being in the lower percentile on crash rate is a good thing (don’t want to be in the 75th there)

Also, I charge too little? (Probably due to a lot of low priced early subscribers)

My 28day retention is also in the 75th 🔥

1. Go to App Store → Analytics → Your app → Benchmarks 2. Note where you're in the 25th percentile ↳ (AKA: it's really bad)



No matter how big your tester group size is, your app’s onboarding, being very critical, is never really thoroughly tested by this group. It means every update you have to be cautious about knocking something over in the onboarding sequence!


UI is my passion

ernstmul's tweet image. UI is my passion

SEO: here are a thousand individual technical improvements you can try to leverage ASO: put the keywords in the title and subtitle and hope it works Great article by @SebastianRoehl though!


Imagine being the engineer that had to code this into Google maps. “How do you mean we need to make it recurring?!”

Pheasant Island The Island That Alternates Sovereignty Between France and Spain Every Six Months

amazingmap's tweet image. Pheasant Island The Island That Alternates Sovereignty Between France and Spain Every Six Months


So there is this Facebook page that uses screenshots from my app, and they clip them in such a way my domain name always exactly falls off… and now other media are referring to them as a source 🥹 Luckily my users have a sharp eye, and help me find this stuff!

Wasn’t aware we rebranded as “North Yorkshire Weather Updates” 🤔 Please fix this, you can refer to AirAssist.app

AirAssistApp's tweet image. Wasn’t aware we rebranded as “North Yorkshire Weather Updates” 🤔
Please fix this, you can refer to AirAssist.app


To finally have these is 🔥

ernstmul's tweet image. To finally have these is 🔥

Have been looking forward to this one 🤩

ernstmul's tweet image. Have been looking forward to this one 🤩


Have been looking forward to this one 🤩

ernstmul's tweet image. Have been looking forward to this one 🤩

Done 🫡

ernstmul's tweet image. Done 🫡

Ok this is getting insane. Getting less than 200 views after 6hours with over 1.2k followers and paying for top tier premium every month (“for maximum exposure”) I’m going to stop X premium



Ok this is getting insane. Getting less than 200 views after 6hours with over 1.2k followers and paying for top tier premium every month (“for maximum exposure”) I’m going to stop X premium

Joint exercise police helicopters Pirol 223, Pirol 316, Ibis 1, Merlin 1 and D-HRPC near Frasdorf 🇩🇪Gemeinsame Übung der Polizeihubschrauber Pirol 223, Pirol 316, Ibis 1, Merlin 1 und D-HRPC bei Frasdorf

AirAssistApp's tweet image. Joint exercise police helicopters Pirol 223, Pirol 316, Ibis 1, Merlin 1 and D-HRPC near Frasdorf

🇩🇪Gemeinsame Übung der Polizeihubschrauber Pirol 223, Pirol 316, Ibis 1, Merlin 1 und D-HRPC bei Frasdorf


He’s not running the TestFlight of his own app 🤔

𝕏 is the #1 source for news on Earth!

elonmusk's tweet image. 𝕏 is the #1 source for news on Earth!


I really miss the “alert evening before” option in @Apple calendar 😅

ernstmul's tweet image. I really miss the “alert evening before” option in @Apple calendar 😅

Ernst Mulders Reposted

Getting ready for the iOS 18 update ☀️🌑🎨


It’s awesome that after 2 years some users decide: “yeah now it’s the time to start with those premium features” And really cool that @RevenueCat provides the data to get these insights!

ernstmul's tweet image. It’s awesome that after 2 years some users decide: “yeah now it’s the time to start with those premium features”

And really cool that @RevenueCat provides the data to get these insights!

My current state here 😂

ernstmul's tweet image. My current state here 😂

Exciting first day today: I’ve joined @appwrite as Product Engineer 🚀


I have this @WaterbomberApp user that keeps using the app, but at the same time also keeps sending me feedback forms on how useless he thinks the app is 🤷🏼‍♂️ What would you do with such a user?


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