Apps Like Rissa Citizen Science for iPhone and iPad
Ranked alternatives
Showing 21–40 of 1,000 ranked alternatives.
US Citizenship Test 2026
Wei Zhang
Study and prepare for the US
Study for the US with flashcards, quizzes, and progress tracking. Review questions and answers, star favorites for later review, and take practice tests to assess knowledge. Track progress and prepare for the final interview.
Monarch SOS
Naturedigger LLC
Identify monarchs and report sightings
Identify butterflies across all life stages and distinguish from look-alikes. Learn about milkweed species and their role in development. Report sightings to contribute to scientific research.
Citizen Test Prep 2026
MastrAPI Ltd
Prepare for citizenship exam with study plan
Prepare for the U.S. citizenship exam by creating a personalized study plan. Practice answering questions in the 100-question or 128-question format. Take mock tests to track progress and identify areas needing improvement.
PlantNet
CTRE COOP INTERNAT RECHERCHE AGRO DEV
Identify plants with smartphone photographs.
The app identifies plants from user-submitted photographs. It collects and analyzes images to understand plant biodiversity and preservation.
Chesapeake Dolphin Watch
Tony Niemann
Track sightings and behaviors
Report sightings by selecting a location or using current position. Enter the number of dolphins seen and submit observations. Data is collected to study behavior and habitat use in the Bay.
Citizen Calculator App
Devkrushna Infotech Private Limited
Calculate, add, subtract, multiply, divide, and percentage
Perform basic arithmetic operations including addition, subtraction, multiplication, and division. Calculate percentages and use memory functions like M+, M-, MR, MU, and GT. Includes square root functionality.
How we rank alternatives
Apps are ranked by functional similarity, category fit, rating confidence, and popularity.