# Contraction Timer: 5-1-1 — Duration, Interval & Alert

> Duration, Interval & Alert (iPhone/iPad app by Blas Prieto.)

- Source: https://appshunter.io/ios/app/contraction-timer/id6759358935 (this page in markdown: same URL + `.md`)
- Developer: [Blas Prieto](https://appshunter.io/developer/1878084920)
- Category: Lifestyle
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 25 MB
- Languages: American English
- Released: 2026-02-20
- Data updated: 2026-03-17
- User reviews in markdown: https://appshunter.io/ios/app/contraction-timer/id6759358935/reviews.md

## What is Contraction Timer?

Time your contractions and know when it's time to go to the hospital.

Contraction Timer tracks duration and interval with a simple start/stop button. It calculates your last 5 and last 10 averages and alerts you when you hit the 5-1-1 rule.

KEY FEATURES:

* One-Tap Timing - Start and stop with a single button tap
* 5-1-1 Hospital Alert - Pulse animation when contractions meet hospital-ready pattern
* Running Averages - Average duration and interval for last 5 and last 10
* Contraction Log - Complete history with timestamps
* Share Summary - Share with your partner or healthcare provider

IMPORTANT: This app is not medical advice. It is for informational purposes only and is not a substitute for professional medical guidance. Always follow your healthcare provider's instructions on when to go to the hospital. The 5-1-1 rule is a general guideline and may not apply to all pregnancies.

Free to download. No sign-up. No paywall. Works offline.

By Blas Apps - simple calculators that do one thing perfectly.


## Version history (last 5 releases)

### 1.0.6 — 2026-03-16

Improved App Store listing.

### 1.0.5 — 2026-03-04

Fixed a crash that could occur on app launch. Improved stability and performance.

### 1.0.4 — 2026-03-03

Fixed a crash that could occur on app launch. Improved stability.

### 1.0.3 — 2026-03-03

Bug fixes and performance improvements.

### 1.0.2 — 2026-02-25

Performance improvements and bug fixes.

## More apps by Blas Prieto

- [Compound Calc: Savings](https://appshunter.io/ios/app/compound-calc/id6759321374)
- [Auto Loan Calc: Car Payment](https://appshunter.io/ios/app/auto-loan-calc/id6759358751)
- [Ovulation Calc & Fertile Days](https://appshunter.io/ios/app/ovulation-calc-and-fertile-days/id6759358803)
- [Mulch Calculator & Estimator](https://appshunter.io/ios/app/mulch-calculator-and-estimator/id6759358826)
- [BTU Calculator: AC & HVAC](https://appshunter.io/ios/app/btu-calculator/id6759358896)
- [Freelance Rate Calculator](https://appshunter.io/ios/app/freelance-rate-calculator/id6759358903)

All apps by Blas Prieto: https://appshunter.io/developer/1878084920

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-03-17.*