Comparison

NFP Calendar vs Sisu Longevity Studio

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

NFP Calendar

Track your fertility naturally using various methods like Creighton or Billings. Record daily observations, manage your cycle, and export data for your instructor or doctor. Designed specifically for Natural Family Planning users.

Highlights
  • Record mucus observations
  • Track menstrual flow
  • Log intercourse timing
  • Automatic cycle detection
  • Generate PDF charts
  • Export data as JSON
  • iCloud sync
Features
Read full description

Track your fertility naturally with a beautiful, intuitive charting app designed for Natural Family Planning methods. NFP Calendar helps you record daily fertility observations following Creighton Model, Billings, or other mucus-based NFP methods. Whether you're trying to conceive or avoid pregnancy naturally, this app gives you everything you need to chart with confidence. DAILY CHARTING MADE SIMPLE - Record mucus observations: color, sensation, and stretch - Track menstrual flow intensity (heavy, moderate, light, spotting) - Log intercourse timing and frequency - Mark peak days and cycle starts - Add personal notes to any day POWERFUL CYCLE MANAGEMENT - Automatic cycle detection and numbering - Smart handling of spotting vs. true periods - View your complete cycle history at a glance - Navigate cycles easily with calendar and list views EXPORT & BACKUP - Generate beautiful PDF charts for your instructor or doctor - Export your data as JSON for backup - iCloud sync keeps your data safe across devices DESIGNED FOR NFP USERS Built specifically for fertility awareness methods, not just another period tracker. Every feature is tailored to the vocabulary and workflow of NFP charting. Your fertility data stays private on your device. No account required. Start charting your fertility journey today. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://estebancervera.github.io/nfp-support/

About

Sisu Longevity Studio

Features
Read full description

Download the Sisu Longevity Studio App today to plan and schedule your classes! From this mobile App, you can view class schedules and sign up for classes as well as view the studio’s location. Optimize your time and maximize the convenience of signing up for classes from your device! Download this App today!

Screenshots

NFP Calendar4 screens
Sisu Longevity Studio3 screens

Verdict

The call

The clearest difference is update cadence: Sisu Longevity Studio at fortnightly against NFP Calendar's every 2 months. Sisu Longevity Studio also leads on iOS requirement (16.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

NFP Calendar ships an update every 2 months, Sisu Longevity Studio fortnightly. The most recent releases landed on October 22, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 8 level
NFP Calendar versus Sisu Longevity Studio: the parameters behind the verdict, then further details
ParameterNFP CalendarSisu Longevity Studio
PriceFreeFree
Rating4.7 (3 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 2 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.016.0 — better
Further details — not scored
Size8 MB194 MB
Age rating12+4+
DeveloperEsteban CerveraSisu Longevity Studio LLC

In-app purchases

None

NFP Calendar

No in-app purchases

None

Sisu Longevity Studio

No in-app purchases

Questions

Is NFP Calendar free?
NFP Calendar is free to download, with no in-app purchases.
Is Sisu Longevity Studio free?
Sisu Longevity Studio is free to download, with no in-app purchases.
Do NFP Calendar or Sisu Longevity Studio have ads?
Neither NFP Calendar nor Sisu Longevity Studio shows ads.
Which is updated more often, NFP Calendar or Sisu Longevity Studio?
NFP Calendar ships an update every 2 months, and Sisu Longevity Studio fortnightly. Most recently, NFP Calendar was updated on October 22, 2026 and Sisu Longevity Studio on October 25, 2026.

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