I rebuilt PostFinance’s E-Piggy because I missed it, would anyone else find this useful?

Hey everyone,

So here’s a small personal project I’ve been building and now I’m wondering if I’m the only one who misses this, or if it could actually be useful to others too.

A while ago, PostFinance had this feature called E-Tierlire(E-Kässeli). It would automatically round up your card payments and move the spare change into a savings account. Super simple, but honestly… I loved it and It made saving feel effortless

Then they shut it down…🥲
So I decided to rebuild it for myself. 😈

What I’ve built so far:

Each evening, my iPhone runs a Shortcut that pulls the day’s Apple Pay transactions and saves them in a PDF or text format to my Dropbox.

Then a Python script picks it up automatically:
– Calculates the round-up for each transaction
– Generates a Swiss QR-bill so I can transfer the total to my savings (which makes it compatible with other e-banking systems)
– Sends me everything on Telegram (daily summary, amount saved, and a mini equity curve)
– Logs it all to Google Sheets to track progress
– I « share » it into the PostFinance app and slide to validate (single manuel action)

What I do with the savings (but you do you):

Every Friday, I send whatever I’ve saved that week to Yuh, where I invest small amounts.
It’s become a kind of habit and honestly, it feels good to save without pressure.

What I’m thinking about next:
– Making the QR-bill available via email as well (not just Telegram)
– Building an Android-compatible flow
– Finding a workaround to also catch regular card transactions, not just Apple Pay
– Maybe… turning it into a real app or web tool if there’s genuine interest

I’m sharing this because I’m genuinely curious:
• Would you find something like this useful?
• Do you also miss the E-piggy?
• Would you be open to testing a first version?

I didn’t build this to make money, just to bring back something I found meaningful. But if others want it too, I’d be happy to push it further. Of course im more than happy for any kind of feedback

For the devs, I’ll put it in open source after some cleaning.

Thanks for reading!
Greetings from Geneva 🇨🇭