Like the title says I'm looking for a free (preferably open source) app yo track my gym progress.
Somewhere where I can add my weights. May be the app can remind when it's time to increase the weight (progressive overload).
it would also be cool if there is charts to monitor progress.
Fitnotes is great. Free but you can pay a one-time "supporter fee" to get slightly expanded functionality. Its on android, not sure about apple.
It ticks all your boxes, except open-source. But you can export all your data