stickK is unique - instead of setting and tracking goals in an isolated way, the app has created a system of binding agreements.
As a stickK user, you sign a Commitment Contract stating that you will follow through on your newly set goals and targets by putting money on the line.
There's a psychology of loss aversion in place to not lose the money you put in, but more importantly this can build accountability to yourself that you've physically committed to your new goal, and there's actual stakes to it beyond a purely mental stake.
stickK users have put $51 million dollars on the line and collectively created 533,000 commitments. The website also says its users managed to avoid smoking 42 million cigarettes. There's power in those numbers, so perhaps it's worth giving it a try.
Productive is a habit tracker with extensive functionality to track habits, view your weekly or monthly progress, and keep an eye on your streak for various habits.
What's great about Productive is that the app has curated a set of great habits around morning routine, sleeping better, getting stuff done etc. which makes it easy for someone new to setting habits to get started.
Another really great feature is Siri shortcuts in the iOS app, allowing you to check off habits using just your voice. The same feature isn't available for Google Assistant.
stickK for iOS scores a poor 3.3 rating. See latest reviews.
stickK for Android scores an average 3.8 rating. See latest reviews.
stickK App Review: Would You Put Money on the Line to Achieve Your Goals? by Money Crashers.
stickK is a free to download app, but to participate in the accountability system you have pay for the stakes involved.
Productive is available as a free app and is supported by in-app purchases. You can upgrade for $3.99 or get a 1 year subscription for $23.99.
This app is not available for Web, MacOS or Windows desktop PCs.