Comparison

Preg Wheel vs STI Tx Guide

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

Head to head
About

Preg Wheel

This app provides a digital pregnancy wheel for iPhone users, eliminating the need for a physical one. It allows for quick input of key dates and offers accurate results, accounting for calendar variations. The app also saves your information for future use and includes important dates for screenings throughout the pregnancy.

Highlights
  • Input LMP, EDD, EGA, and IVF dates
  • Accurate date calculations with leap year support
  • Save and restore input dates
  • Track important screening test dates
  • View dates for 1st Trimester US, CVS, Quad Screen, and more
Features
Read full description

Simple and fast pregnancy wheel available for the iPhone, No need to carry a paper wheel. The best part is the app is completely free. Features ------------------------------- 1) Quickly input various dates with the date wheel: • Last menstrual period (LMP) • Estimated date of delivery (EDD) • Estimated Gestational Age (EGA) • IVF dates 2) Accurate results: Preg Wheel provides exact dates and accounts for all calendar variance, including leap years. 3) Persistence: Preg Wheel can save the date and date type and restore them when launched to streamline your workflow. 4) Now with even more relevant dates for the entire pregnancy. Know in advance when specific screening tests need to be performed. • 1st Trimesters US • CVS • Quad Screen • Amino • Anatomy US • GTT • Anti-D Prophylaxis • GBS Screen • Elective Delivery

About

STI Tx Guide

Provides healthcare professionals with up-to-date, evidence-based recommendations for the prevention, diagnosis, and treatment of sexually transmitted infections. Features include clinical care guidance, sexual history resources, and patient materials for effective patient management.

Highlights
  • STI prevention recommendations
  • Diagnosis guidance
  • Treatment protocols
  • Clinical care assistance
  • Sexual history resources
  • Patient management tools
Features
Read full description

The new app offers quick and easy access to streamlined STI prevention, diagnosis, and treatment recommendations. The user-friendly interface includes more clinical care guidance, sexual history resources, patient materials, and other features to assist with patient management. The STI Treatment (Tx) Guidelines mobile app serves as a quick reference guide for doctors and related parties on the identification of and treatment for sexually transmitted diseases (STDs). The full STI Treatment Guidelines (cdc.gov) can be accessed at https://www.cdc.gov/std/treatment-guidelines/default.htm. The guidelines provide current evidence-based prevention, diagnostic and treatment recommendations that replace the 2015 guidance. The recommendations are intended to be a source for clinical guidance. Healthcare providers should always assess patients based on their clinical circumstances and local burden. DISCLAIMER THE MATERIALS EMBODIED IN THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE CENTERS FOR DISEASE CONTROL AND PREVENTION (CDC) OR THE UNITED STATES (U.S.) GOVERNMENT BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT, SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, LOSS OF PROFIT, LOSE OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF THIRD PARTIES, WHETHER OR NOT CDC OR THE U.S. GOVERNMENT HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.

Screenshots

Preg Wheel4 screens
STI Tx Guide4 screens

Verdict

The call

The clearest difference is rating: Preg Wheel at 4.0 against STI Tx Guide's 3.5. Preg Wheel also leads on review sentiment (59% vs 36%) and iOS requirement (10.0 vs 15.0). STI Tx Guide's advantage is update cadence (every 2 months vs every 9 months). On price, ratings volume, ads and in-app purchases 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.

ReceptionRating · Positive reviews · Number of ratings

Preg Wheel holds the better App Store score, 4.0 against 3.5. Both are backed by a comparable volume of ratings — 62 and 36 respectively. Written reviews point the same way: 59% of Preg Wheel's written reviews are positive against 36% of STI Tx Guide's.

UpkeepUpdate frequency

Preg Wheel ships an update every 9 months, STI Tx Guide every 2 months. The most recent releases landed on October 15, 2026 and October 17, 2026 respectively.

Scorecard4 real differences · 6 level
Preg Wheel versus STI Tx Guide: the parameters behind the verdict, then further details
ParameterPreg WheelSTI Tx Guide
PriceFreeFree
Rating4.0 (62 ratings) — better3.5 (36 ratings)
Positive reviews58.6% of reviews — better35.7% of reviews
Number of ratings62 — better36
Update frequencyEvery 9 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS10.0 — better15.0
Further details — not scored
Size24 MB36 MB
Age rating17+12+
DeveloperAndrew YuCenters For Disease Control and Prevention

Customer experience

Preg Wheel

All ratings62 ratings
Positive72.6%
Neutral4.8%
Negative22.6%
Written reviews58 reviews
Positive58.6%
Neutral1.7%
Negative39.7%

STI Tx Guide

All ratings36 ratings
Positive63.9%
Neutral2.8%
Negative33.3%
Written reviews14 reviews
Positive35.7%
Neutral7.1%
Negative57.1%

Bugs and requests

Preg Wheel

Reported bugs

13 issues
  • IVF dating function does not work
  • Cannot calculate due date based on weeks and ultrasound date
  • LMP does not change when due date is entered, and vice versa
  • App not compatible with iOS 14
  • App not compatible with iOS 11
Show 8 more
  • App not compatible with iOS 7
  • App not working after iPhone updates
  • App crashes or shuts down
  • Gestational weeks are wrong
  • All numbers came up wrong
  • Does not work on iPad anymore
  • Freezes phone
  • Instant shutdown

Requested features

5 requests
  • Update for latest iOS
  • Update IVF dating function
  • Add FTS window
  • Ensure compatibility with newer devices/OS
  • Local time zone support

STI Tx Guide

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Preg Wheel

No in-app purchases

None

STI Tx Guide

No in-app purchases

Questions

Is Preg Wheel free?
Preg Wheel is free to download, with no in-app purchases.
Is STI Tx Guide free?
STI Tx Guide is free to download, with no in-app purchases.
Which has better reviews, Preg Wheel or STI Tx Guide?
Preg Wheel is rated higher. Preg Wheel averages 4.0 out of 5 from 62 ratings, while STI Tx Guide averages 3.5 from 36 ratings.
Do Preg Wheel or STI Tx Guide have ads?
Neither Preg Wheel nor STI Tx Guide shows ads.
Which is updated more often, Preg Wheel or STI Tx Guide?
Preg Wheel ships an update every 9 months, and STI Tx Guide every 2 months. Most recently, Preg Wheel was updated on October 15, 2026 and STI Tx Guide on October 17, 2026.

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