Calorie Tracker Guide · 2026-11-14
Verdict
Eight Sleep prices as Free · 2 in-app purchase option(s). Senza: Keto & Fasting prices as Free. Senza: Keto & Fasting is marked for Barcode scanner, Apple Health, Macro tracking. Eight Sleep is not. Editorial scores are 4.8 for Eight Sleep and 5.2 for Senza: Keto & Fasting, on a 10-point scale. That score is not the store rating.
Price
Eight Sleep: Free · 2 in-app purchase option(s).
Senza: Keto & Fasting: Free.
Monthly figure: Eight Sleep $18.99, Senza: Keto & Fasting unknown.
Yearly figure: Eight Sleep $179.99, Senza: Keto & Fasting unknown.
Features that differ
Barcode scanner: only Senza: Keto & Fasting is marked available.
Apple Health: only Senza: Keto & Fasting is marked available. Mentioned in the App Store description.
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.
Fit
Eight Sleep has no best-fit line.
Senza: Keto & Fasting has no best-fit line.
Where the scores differ
Pricing value: Eight Sleep 0, Senza: Keto & Fasting 10. Eight Sleep: 10 - annualised price $179.99/15 (+0.5 if free trial). Senza: Keto & Fasting: 10 - annualised price $0.00/15 (+0.5 if free trial).
Feature depth: Eight Sleep 0.8, Senza: Keto & Fasting 2.3. Eight Sleep: 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: Eight Sleep 8.2, Senza: Keto & Fasting 9. Eight Sleep: Bayesian rating 4.68 (iOS 4.76x17948 + Play 4.20x2854, prior 4.3x200) + review stars sentiment -0.55 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: Eight Sleep 9.6, Senza: Keto & Fasting 1.7. Eight Sleep: Last release 0 days ago (half-life 90d, 70%) + median 4 days between releases (30%). Senza: Keto & Fasting: Last release 332 days ago (half-life 90d, 70%) + median 47 days between releases (30%).
Traction: Eight Sleep 7.2, Senza: Keto & Fasting 6.8. Eight Sleep: log10 of 20802 total ratings (iOS+Play), 1M ratings = 10. Senza: Keto & Fasting: log10 of 12723 total ratings (iOS+Play), 1M ratings = 10.
Who should pick which
Choose Senza: Keto & Fasting if you need Barcode scanner and Apple Health.