# Arc vs Pillar

The clearest difference is update cadence: Pillar at every 10 days against Arc's monthly. Pillar also leads on iOS requirement (18.0 vs 26.5). Arc's advantage is device support (3 vs 1). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Arc sells 2 in-app purchases, starting at $4.99 per month and Pillar sells 2 in-app purchases, starting at $7.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Arc ships an update monthly, Pillar every 10 days. The most recent releases landed on November 10, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Arc | Pillar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pillar-posture-reminder/id6809597345/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 10 days** |
| Monetization | — | Freemium |
| Size | 11 MB | 27 MB |
| Requires iOS | 26.5 | **18.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Largent Labs, LLC](https://appshunter.io/developer/879923270) | [Maksym Pustovit](https://appshunter.io/developer/1886895390) |

## What reviewers say

### Arc

[App page](https://appshunter.io/ios/app/arc-start-your-training/id6782144934)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $4.99 | per month |
| Pro yearly | $39.99 | per year |


### Pillar

[App page](https://appshunter.io/ios/app/pillar-posture-reminder/id6809597345)

Improve your posture and focus with this app that uses your AirPods' motion sensors to detect slouching. It provides gentle nudges and tracks your progress over time, integrating with Pomodoro timers for enhanced productivity. No camera or extra wearables are required.

**Highlights:** Live posture reading via AirPods motion sensors, Gentle, responsive nudges for slouching, Integrated Pomodoro focus and break timer, Daily tall-time goal and streak tracking, Weekly trend and session insights, Live Activity and widget support

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pillar Premium Weekly | $7.99 | per 7 days |
| Pillar Premium Yearly | $28.99 | per year |


## Frequently asked questions

### Is Arc free?

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

### Is Pillar free?

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

### Do Arc or Pillar have ads?

Neither Arc nor Pillar shows ads.

### Which is updated more often, Arc or Pillar?

Arc ships an update monthly, and Pillar every 10 days. Most recently, Arc was updated on November 10, 2026 and Pillar on October 31, 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.*