NFP Calendar vs Sisu Longevity Studio
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Record mucus observations
- Track menstrual flow
- Log intercourse timing
- Automatic cycle detection
- Generate PDF charts
- Export data as JSON
- iCloud sync
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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/
Sisu Longevity Studio
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
| Parameter | NFP Calendar | Sisu Longevity Studio |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (3 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 2 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 194 MB |
| Age rating | 12+ | 4+ |
| Developer | Esteban Cervera | Sisu Longevity Studio LLC |
In-app purchases
NFP Calendar
No in-app purchases
Sisu Longevity Studio
No in-app purchases
Questions
Is NFP Calendar free?
Is Sisu Longevity Studio free?
Do NFP Calendar or Sisu Longevity Studio have ads?
Which is updated more often, NFP Calendar or Sisu Longevity Studio?
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