# Obi by Dr. Sterling vs Contraction Timer

The clearest difference is chart position: Obi by Dr. Sterling at #169 against Contraction Timer's unranked. Obi by Dr. Sterling also leads on iOS requirement (15.1 vs 18.0). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Obi by Dr. Sterling sells 4 in-app purchases, starting at $7.99 per month and Contraction Timer sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Contraction Timer holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 38 and 101 respectively. Written reviews point the same way: 96% of Obi by Dr. Sterling's written reviews are positive against 100% of Contraction Timer's.

Obi by Dr. Sterling ships an update every 2 weeks, Contraction Timer every 3 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | Obi by Dr. Sterling | Contraction Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (38 ratings)](https://appshunter.io/ios/app/obi-by-dr-sterling/id6748208571/reviews) | **[5.0 (101 ratings)](https://appshunter.io/ios/app/contraction-timer-labora/id6749383000/reviews)** |
| Number of ratings | 38 | **101** |
| Positive reviews | 96.2% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | Free | Free |
| Best chart rank | **#169** | — |
| Size | 56 MB | 22 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 17+ | 4+ |
| Developer | [The Sterling Life LLC](https://appshunter.io/developer/1824610670) | [Panittha Suwannajang](https://appshunter.io/developer/1736296879) |

## What reviewers say

### Obi by Dr. Sterling

[App page](https://appshunter.io/ios/app/obi-by-dr-sterling/id6748208571)

**Currently charting:** #169 Top Grossing · Medical (US App Store)

This app provides personalized pregnancy and toddler guidance from a board-certified ObGyn and expert team. It offers research-backed answers to common concerns, weekly updates, and a supportive community for science-minded women.

**Highlights:** Personalized pregnancy and toddler guidance, Expert advice from board-certified ObGyn, Weekly guidance updates, Research-backed answers, Supportive community forum

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tier 1 Monthly | $7.99 | per month |
| Monthly Subscription | $23.99 | per month |
| Tier 1 Yearly | $79.99 | per year |
| Yearly Subscription | $239.99 | per year |

**What reviewers like**

- 👍 Comprehensive information
- 👍 User-friendly app
- 👍 Great resource for new parents
- 👍 Positive support for parents
- 👍 Clear and useful information


### Contraction Timer

[App page](https://appshunter.io/ios/app/contraction-timer-labora/id6749383000)

Effortlessly time labor contractions with a single tap from your Lock Screen, Apple Watch, or hands-free via Siri. This free app helps you track duration, intervals, and frequency to identify patterns and know when to seek medical help.

**Highlights:** One-tap contraction tracking, Apple Watch app, Lock Screen & Home Screen widgets, Siri hands-free timing, Clear timeline view, Smart regularity notifications, Private and secure

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Optional Support - Small | $3.49 | one-time |
| Optional Support - Medium | $13.00 | one-time |
| Optional Support - Large | $35.00 | one-time |


## Frequently asked questions

### Is Obi by Dr. Sterling free?

Obi by Dr. Sterling is free to download, with in-app purchases available.

### Is Contraction Timer free?

Contraction Timer is free to download, with in-app purchases available.

### Which has better reviews, Obi by Dr. Sterling or Contraction Timer?

Contraction Timer is rated higher. Obi by Dr. Sterling averages 4.8 out of 5 from 38 ratings, while Contraction Timer averages 5.0 from 101 ratings.

### Do Obi by Dr. Sterling or Contraction Timer have ads?

Neither Obi by Dr. Sterling nor Contraction Timer shows ads.

### Which is updated more often, Obi by Dr. Sterling or Contraction Timer?

Obi by Dr. Sterling ships an update every 2 weeks, and Contraction Timer every 3 weeks. Most recently, Obi by Dr. Sterling was updated on October 24, 2026 and Contraction Timer on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*