Comparison

Chart Neo vs NFP Calendar

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

Head to head
About

Chart Neo

This app simplifies menstrual cycle tracking by combining proven methods into an easy-to-use interface. It offers fast recording, offline functionality, and detailed chart viewing, with an accompanying web portal for advanced features and advisor interaction.

Highlights
  • Combines proven charting methods
  • Fast and easy sign recording
  • Offline functionality
  • View historical charts
  • Web portal access
  • Share with spouse/devices
  • Apple Watch companion app
Features
Read full description

Creighton. Sympto-Thermal. Marquette. Billings. So many different methods to track your menstrual cycle. It can be confusing to find one that works for you. Neo takes the proven elements from these and many others to create an easy, fast, and powerful way to chart. - Free *45 Day* trial. We want to be sure the app is working well for you! Very low cost afterward. - Starts up faster than any other charting app. Super easy to record your sign and get on with your life. - Still works without a cell or WiFi signal. Often there is not a good signal where you may be recording your signs! - View your chart on your device, going as far back as you like. View multiple cycles at once! - Access to a powerful web portal where you can create PDFs of your chart, interact with an advisor, and more. - Share with your spouse! Share your account across multiple devices. - Apple Watch companion app - Optional HealthKit integration - Continuous updates and new features added thanks to feedback from users

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/

Screenshots

Chart Neo3 screens
NFP Calendar4 screens

Verdict

The call

The clearest difference is in-app purchases: NFP Calendar at none against Chart Neo's 2. NFP Calendar also leads on review sentiment (100% vs 80%). Chart Neo's advantage is ratings volume (72 vs 3) and device support (4 vs 2). On price, rating, update cadence and ads 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. Chart Neo sells 2 one-off in-app purchases. NFP Calendar asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Chart Neo holds the better App Store score, 4.8 against 4.7. That said, the two scores are not equally well evidenced: Chart Neo has 72 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 80% of Chart Neo's written reviews are positive against 100% of NFP Calendar's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Chart Neo ships an update every 6 weeks, NFP Calendar every 2 months. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

Scorecard6 real differences · 4 level
Chart Neo versus NFP Calendar: the parameters behind the verdict, then further details
ParameterChart NeoNFP Calendar
PriceFreeFree
Rating4.8 (72 ratings) — better4.7 (3 ratings)
Positive reviews79.5% of reviews100.0% of reviews — better
Number of ratings72 — better3
Update frequencyEvery 6 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad
Requires iOS13.6 — better26.0
Further details — not scored
Size15 MB8 MB
Age rating12+12+
DeveloperNeoFertility LLCEsteban Cervera

Customer experience

Chart Neo

All ratings72 ratings
Positive97.2%
Neutral2.8%
Negative0.0%
Written reviews44 reviews
Positive79.5%
Neutral4.5%
Negative15.9%

NFP Calendar

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Chart Neo

Reported bugs

4 issues
  • App crashes when entering data
  • Keyboard stays up after email/password entry preventing setup
  • App requires logging in and reintegrating with Tempdrop frequently
  • Swiping left to right to log symptom level confuses the app

Requested features

9 requests
  • Add decreased appetite as a symptom
  • Add lower back pain as a symptom
  • Make main screen buttons more visible
  • Explain colors/notations and extra features within the app
  • Bring back the ability to easily swipe between days
Show 4 more
  • Allow changing cycle start date if tapped incorrectly
  • Improve the analysis system
  • Make pricing more accessible before download/signup
  • Allow opening other apps for integration directly

NFP Calendar

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

Chart Neo

One-time2
  • One Year of Chart Neo$19.99
  • Cycle Charting Basics$99.99
None

NFP Calendar

No in-app purchases

Questions

Is Chart Neo free?
Chart Neo is free to download, with in-app purchases available.
Is NFP Calendar free?
NFP Calendar is free to download, with no in-app purchases.
Which has better reviews, Chart Neo or NFP Calendar?
Chart Neo is rated higher. Chart Neo averages 4.8 out of 5 from 72 ratings, while NFP Calendar averages 4.7 from 3 ratings.
Do Chart Neo or NFP Calendar have ads?
Neither Chart Neo nor NFP Calendar shows ads.
Which is updated more often, Chart Neo or NFP Calendar?
Chart Neo ships an update every 6 weeks, and NFP Calendar every 2 months. Most recently, Chart Neo was updated on November 2, 2026 and NFP Calendar on October 30, 2026.

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