# Confidence Interval Calc vs BarLock

The clearest difference is in-app purchases: Confidence Interval Calc at none against BarLock's 1. Confidence Interval Calc also leads on device support (3 vs 1) and iOS requirement (13.0 vs 26.1). On price, update cadence and ads there is nothing between them.

Both are free to download. BarLock sells 1 one-off in-app purchase. Confidence Interval Calc asks for nothing beyond the download.

Confidence Interval Calc ships an update every 6 days, BarLock every 3 days. The most recent releases landed on October 13, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Confidence Interval Calc | BarLock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/barlock-barcode-alarm/id6772532044/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 days | **Every 3 days** |
| Monetization | — | Freemium |
| Size | 30 MB | 32 MB |
| Requires iOS | **13.0** | 26.1 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Arsosa Network Inc.](https://appshunter.io/developer/1209042440) | [CODE IN MOTION SRL](https://appshunter.io/developer/1896060625) |

## What reviewers say

### Confidence Interval Calc

[App page](https://appshunter.io/ios/app/confidence-interval-calc/id6749201174)

**Features:** macOS Compatibility

**In-app purchases:** none


### BarLock

[App page](https://appshunter.io/ios/app/barlock-barcode-alarm/id6772532044)

This app helps you wake up by requiring you to scan a unique barcode or QR code from an item across the room to turn off your alarm. It prevents snoozing and ensures you physically get out of bed.

**Highlights:** Barcode and QR code alarm missions, Exact-code matching, Full-screen Scan to Stop, Wrong-item protection, Wake-up check after dismissal, No ads or tracking

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BarLock PRO Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Confidence Interval Calc free?

Confidence Interval Calc is free to download, with no in-app purchases.

### Is BarLock free?

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

### Do Confidence Interval Calc or BarLock have ads?

Neither Confidence Interval Calc nor BarLock shows ads.

### Which is updated more often, Confidence Interval Calc or BarLock?

Confidence Interval Calc ships an update every 6 days, and BarLock every 3 days. Most recently, Confidence Interval Calc was updated on October 13, 2026 and BarLock on October 7, 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.*