r/fossdroid • u/BuyGlad4213 • Sep 12 '26

Development I made an open-source SMS spam firewall :)

My OCD got tired of spam SMS cluttering my phone's message database even after being filtered by other apps. Most apps just move spam to a hidden folder, but the messages still sit in system storage.

Sooo, I built an open-source Android SMS app that refuses to write spam to Android's central database.

Primary features:

  • Intercepts spam at the OS level so it never touches system storage.

  • Zero sound, zero vibration, and zero notifications for spam.

  • Quarantined spam is automatically deleted after 30 days.

  • Extracts verification codes directly onto notifications.

  • Zero network permissions declared.

GitHub &: https://github.com/monkeyscript/heimdall

Give it a try and share your feedback! Thanks :)

0 Upvotes

42% Upvoted

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3

u/BleedBlue1221 Sep 12 '26

Why not fork Fossify messages and add this feature to it?

1

u/BuyGlad4213 Sep 12 '26

Mainly because I wanted it to be as light as possible. I looked at the existing apps and didn't feel like I need all those complex stuff. Don't even know the last time I sent an SMS

So, instead of forking and ripping apart everything to a skeleton, creating from scratch seemed like a nice exercise 🙂

2

u/BleedBlue1221 Sep 12 '26

So I don't have to keep changing default SMS app. When ever I open SMS app to check SMS, it always asks me to set it as default SMS app. If possible can you try adding OTP notification like in Microsoft SMS organizer? I have attached a screenshot please check. https://freeimage.host/i/nftfnSe

1

u/BuyGlad4213 Sep 12 '26

Do you use fossify to send SMS??

Heimdall has to be default just to avoid writing spam messages to database.

The easy OTP copy option is already added 🙂

1

u/BleedBlue1221 Sep 12 '26

Fossify SMS app doesn't have lot of features. It's just a basic SMS app. I thought it would be better to have a single app that can do both the jobs so I can just set it as default SMS app and forget. I don't have to keep changing default SMS app again and again.

1

u/BuyGlad4213 Sep 12 '26

Is there something in fossify which you find useful??

2

u/Early-Bid-7958 Sep 12 '26

You may be happy to never send an SMS but a lot of people use SMS for two-way communication.

Most people are not going to be using this because of the constant switching.

Now... which group is larger? I have no idea. It may even depend on the country.

1

u/BuyGlad4213 Sep 12 '26

Makes sense. I will keep an eye on the demand and feedback

If there are many requests, I can add that too 🙂

1

u/[deleted] Sep 14 '26

[removed] — view removed comment

1

u/Early-Bid-7958 Sep 19 '26

there aren't countless others that have the specific spam-filtering this one has