Best apps like 21 Days – AI Challenge

10+ similar apps compared and reviewed

3.4 avg rating
8 free apps
Updated August 2026

Whether you want more options like 21 Days or a completely different take on the same concept, our curated list of 10+ similar apps has you covered. Updated for 2026 with the latest ratings and comparisons.

Top Alternatives to 21 Days

Coliving: Coworking booking#2

Coliving: Coworking booking by Yevheniia Borunova

Book coworking & shared spaces
Strong Contender
🌟 Lifestyle
1.0(1 ratings)
FreeIn-App Purchases
Coliving: Coworking booking screenshot 1
Coliving: Coworking booking screenshot 2
Coliving: Coworking booking screenshot 3
Coliving: Coworking booking screenshot 4
Coliving: Coworking booking screenshot 5
Coliving: Coworking booking screenshot 6

Streamline shared space management for communities. This app replaces chaotic chats and spreadsheets with a unified system for booking coworking areas, gyms, and other shared amenities, preventing conflicts and ensuring transparency for all residents.