Calorie Tracker Guide · 2026-11-14
Verdict
Natural Cycles: Fertility App prices as Free · 2 in-app purchase option(s). Senza: Keto & Fasting prices as Free. Natural Cycles: Fertility App is marked for Coach connection. Senza: Keto & Fasting is not. Senza: Keto & Fasting is marked for Barcode scanner, Macro tracking, Workout tracking. Natural Cycles: Fertility App is not. Editorial scores are 5.5 for Natural Cycles: Fertility App and 5.2 for Senza: Keto & Fasting, on a 10-point scale. That score is not the store rating.
Price
Natural Cycles: Fertility App: Free · 2 in-app purchase option(s).
Senza: Keto & Fasting: Free.
Monthly figure: Natural Cycles: Fertility App $21.99, Senza: Keto & Fasting unknown.
Yearly figure: Natural Cycles: Fertility App $149, Senza: Keto & Fasting unknown.
Features that differ
Barcode scanner: only Senza: Keto & Fasting is marked available.
Macro tracking: only Senza: Keto & Fasting is marked available. Mentioned in the App Store description.
Workout tracking: only Senza: Keto & Fasting is marked available. Mentioned in the App Store description.
Fasting: only Senza: Keto & Fasting is marked available. Mentioned in the App Store description.
Coach connection: only Natural Cycles: Fertility App is marked available. Mentioned in the App Store description.
Fit
Natural Cycles: Fertility App has no best-fit line.
Senza: Keto & Fasting has no best-fit line.
Where the scores differ
Pricing value: Natural Cycles: Fertility App 0.1, Senza: Keto & Fasting 10. Natural Cycles: Fertility App: 10 - annualised price $149.00/15 (+0.5 if free trial). Senza: Keto & Fasting: 10 - annualised price $0.00/15 (+0.5 if free trial).
Feature depth: Natural Cycles: Fertility App 1.5, Senza: Keto & Fasting 2.3. Natural Cycles: Fertility App: Quality-weighted share of tracked features available (excellent 1.0 .. poor 0.2), x1.6, capped at 10. Senza: Keto & Fasting: Quality-weighted share of tracked features available (excellent 1.0 .. poor 0.2), x1.6, capped at 10.
User feedback: Natural Cycles: Fertility App 8, Senza: Keto & Fasting 9. Natural Cycles: Fertility App: Bayesian rating 4.62 (iOS 4.79x30404 + Play 4.41x23548, prior 4.3x200) + review stars sentiment +0.05 over 20 reviews. Senza: Keto & Fasting: Bayesian rating 4.72 (iOS 4.78x10816 + Play 4.44x1907, prior 4.3x200) + review stars sentiment +0.45 over 20 reviews.
Maintenance: Natural Cycles: Fertility App 8.8, Senza: Keto & Fasting 1.7. Natural Cycles: Fertility App: Last release 4 days ago (half-life 90d, 70%) + median 14 days between releases (30%). Senza: Keto & Fasting: Last release 332 days ago (half-life 90d, 70%) + median 47 days between releases (30%).
Traction: Natural Cycles: Fertility App 7.9, Senza: Keto & Fasting 6.8. Natural Cycles: Fertility App: log10 of 53952 total ratings (iOS+Play), 1M ratings = 10. Senza: Keto & Fasting: log10 of 12723 total ratings (iOS+Play), 1M ratings = 10.
Coachability: Natural Cycles: Fertility App 5.5, Senza: Keto & Fasting 0. Natural Cycles: Fertility App: Best quality of aiCoach / coachConnection features. Senza: Keto & Fasting: Best quality of aiCoach / coachConnection features.
Who should pick which
Choose Natural Cycles: Fertility App if you need Coach connection. Choose Senza: Keto & Fasting if you need Barcode scanner and Macro tracking.