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Free
Best apps like 21 Days β AI Challenge
10+ similar apps compared and reviewed
3.7 avg rating
8 free apps
Updated July 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.
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GrowWise
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This intelligent garden planner simplifies square foot gardening and companion planting. It offers personalized guidance, a botanical seed library, and location-based planting calendars to help you create high-yield, low-maintenance gardens.
Smart companion planting suggestionsSquare foot gardening grid layoutExtensive botanical seed library
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Mnmlist β Habit Tracker
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Build habits with clarity and consistency using a distraction-free, minimalist interface. This app focuses on simplicity, helping you show up daily without complicated systems or gamification. It prioritizes privacy and is completely free to use.
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