These are the books behind why this app exists. Read them and you'll understand the psychology of the model.
James Clear
The science of behavior change through small, consistent action. TODO(Antonio): add your personal note on why this book maps onto the GrowOrPay model — the 1% daily-improvement framing pairs naturally with our one-tap daily commitment.
Buy on Amazon →Charles Duhigg
TODO(Antonio): blurb. (The cue-routine-reward loop is the core mechanism we are exploiting — the daily deadline is the cue, tapping YES is the routine, avoiding the charge is the reward.)
Buy on Amazon →Daniel Kahneman
TODO(Antonio): blurb. (Loss aversion — losing $20 hurts roughly twice as much as gaining $20 feels good — is the reason a tiny real fee outperforms a thousand "streak broken" notifications.)
Buy on Amazon →Nir Eyal
TODO(Antonio): blurb. (Eyal's pact-based commitment devices are essentially the manual version of what GrowOrPay automates — pre-committing to a cost if you fail to do the thing you said you'd do.)
Buy on Amazon →Antonio is writing a short book on the psychology behind the app. Sign up to be notified when it's available and get an early-bird discount.
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