# Core 100: Abs in 100 Days — Personalized Ab Workout Plan

> Personalized Ab Workout Plan (iPhone/iPad app by Ronald Westphal.)

- Source: https://appshunter.io/ios/app/core-100-abs-in-100-days/id6799623179 (this page in markdown: same URL + `.md`)
- Developer: [Ronald Westphal](https://appshunter.io/developer/1891783618)
- Category: Health & Fitness
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.6 · 13 MB
- Languages: American English
- Released: 2026-09-02
- Data updated: 2026-09-06
- User reviews in markdown: https://appshunter.io/ios/app/core-100-abs-in-100-days/id6799623179/reviews.md

## What is Core 100?

Build your abs in 100 days.

A personalized 100 day ab plan that adapts as you get stronger.

Pick your level. Follow a daily workout. Rest days are built in. Miss a day and the plan waits.

Four stages: BASE, BUILD, PUSH, PEAK.

Track workouts, take progress photos, and stay on track with optional reminders.

No account. No ads. Everything stays on your phone.

Choose between monthly or lifetime access in the app.

Terms of Use: https://core-legal.pages.dev/

Privacy policy: https://core-privacy.pages.dev/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Core 100 Monthly | $7.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Core 100 Lifetime | $24.99 | one-time |



## Version history (last 2 releases)

### 1.0.2 — 2026-09-05

Bug fixes and performance improvements. Thanks for using Core 100!

### 1.0.1 — 2026-09-02

No release notes.

## More apps by Ronald Westphal

- [Planted: Journal & Reminders](https://appshunter.io/ios/app/planted-journal-and-reminders/id6761859550)
- [Slate: Quit Any Bad Habit](https://appshunter.io/ios/app/slate-quit-any-bad-habit/id6767298222)
- [Habits: Weekly Tracker](https://appshunter.io/ios/app/habits-weekly-tracker/id6787936049)
- [Arc: Simple Workout Tracker](https://appshunter.io/ios/app/arc-simple-workout-tracker/id6794696978)

All apps by Ronald Westphal: https://appshunter.io/developer/1891783618

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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 2026-09-06.*