About
About the app and its publisher
Short version: the 21 Day Habit Challenge App gives you one small action a day for twenty-one days, it has been on Google Play since 2016, it is free with advertising and optional purchases, and this website is run by the people who publish it.
The app
The 21 Day Habit Challenge App, published under the name BestifyMe, runs structured twenty-one-day challenges. You pick one from 44 or more — confidence, discipline, communication, morning routines, leadership, emotional intelligence, gratitude, decluttering and others — and each day it gives you a short piece of framing and one small concrete action. Mark it done and the grid fills in.
It has been published on Google Play since December 2016 and is actively maintained — the listing shows the most recent update in September 2026. It requires Android 7.0 or later. At the time of writing the listing shows more than a million installs and a 4.3 rating from 24,251 ratings on Google Play. Those numbers move, and the listing is always the authoritative version of them.
What this site does not claim
This belongs near the top rather than in the small print, because the whole self-improvement category is built on claims that do not survive checking.
- Twenty-one days is a format, not a scientific threshold. The popular “21 days to form a habit” figure comes from a 1960 book about plastic-surgery patients, not from habit research. The best-known study on the subject found a median of about 66 days to automaticity, with an enormous spread between people. Nothing here promises that a habit is installed on day 22. The full version is in the FAQ.
- No outcome is promised. The app supplies structure and prompts. Whether anything changes depends on whether you do the actions, and no percentage, timeline or guarantee appears anywhere on this site.
- The numbers here are Google Play’s. Install counts and ratings quoted on this site are the ones on the Play listing for this app. No ranking, award, cross-platform total or monthly-user figure is claimed here.
- Nothing here is professional advice. Not therapy, not coaching, not medical or psychological advice, and not a substitute for any of them.
Who publishes it
The app and this website are published by BestifyMe, an independent Android developer based in Ahmedabad, Gujarat, India.
Google verifies the identity and contact details of Play developers and publishes what it verified in the About the developer block on every listing. For this app that block is on the Play listing, alongside the registered name and postal address. This site carries the publishing name, the city and a working support address rather than repeating the whole record — nothing is hidden, and the verified version is one click away.
How the app is funded
- Advertising. The free version shows ads — the Play listing carries a Contains ads badge. That advertising is also where the location sharing in the data safety declaration comes from, rather than from the challenges.
- Optional purchases. The listing carries an In-app purchases badge, priced by Play at $0.49–$19.99 per item. The upgrade is what the app offers when you try to run more than one challenge at once, and it is also how the ads are removed. The details are on the home page.
There is no paid tier of this website and no payment taken anywhere on it. The only transaction that exists happens on Google Play.
What this website is for
A store listing gives you a few hundred words and a row of screenshots. It has no room to explain what a 21-day format is actually good for, what to do when you miss a day, why a challenge app asks for the camera, or what the data safety declaration means for someone about to install. That is what these pages are for.
What the site deliberately does not do:
- It does not host the app or offer an APK. Google Play is the only install route.
- It does not take payments, collect registrations or run a login.
- It does not publish invented reviews, testimonials or awards, and it does not repeat claims — anyone’s — that it cannot check.
- It does not claim any affiliation with Google. Android, Google Play and the Google Play logo are trademarks of Google LLC.
Contact
Email is the support channel. Anything to do with a payment or a refund is faster through Google Play, because that is where the transaction actually lives.
| What about | Where to write |
|---|---|
| App support, bug reports, challenge suggestions | hello@bestifyme.com |
| Privacy, data protection and this website | hello@bestifyme.com, and the app’s own privacy policy for questions about the app itself |
| Billing, purchases, refunds | Your Google Play account — see the FAQ |
| Registered name and postal address | Published by Google in the About the developer block on the Play listing |
When reporting a problem with the app, include the phone model, the Android version and the app version.
Legal documents
- This website’s privacy policy — what happens when you visit these pages.
- The app’s privacy policy — what happens inside the app. Also linked from the Play listing.
- Terms of use for this website — the rules for these pages. Use of the app itself is additionally governed by the Google Play Terms of Service.