# HPLC Troubleshooting Guide vs Loop

The clearest difference is in-app purchases: HPLC Troubleshooting Guide at none against Loop's 3. HPLC Troubleshooting Guide also leads on rating (5.0 vs 4.8) and device support (3 vs 1). Loop's advantage is update cadence (every 10 days vs every 2 months). On price, ratings volume and ads there is nothing between them.

Both are free to download. Loop sells 3 in-app purchases, starting at $2.99 per 7 days. HPLC Troubleshooting Guide asks for nothing beyond the download.

HPLC Troubleshooting Guide holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 3 and 4 respectively.

HPLC Troubleshooting Guide ships an update every 2 months, Loop every 10 days. The most recent releases landed on October 8, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | HPLC Troubleshooting Guide | Loop |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/hplc-troubleshooting-guide/id573520445/reviews)** | [4.8 (4 ratings)](https://appshunter.io/ios/app/loop-screen-time-control/id6749889786/reviews) |
| Number of ratings | 3 | **4** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | **Free** | Freemium |
| Size | 49 MB | 39 MB |
| Requires iOS | **8.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Thermo Fisher Scientific](https://appshunter.io/developer/407517076) | [Onur Ugur](https://appshunter.io/developer/1661191432) |

## What reviewers say

### HPLC Troubleshooting Guide

[App page](https://appshunter.io/ios/app/hplc-troubleshooting-guide/id573520445)

This application provides comprehensive guidance for diagnosing and resolving issues with High-Performance Liquid Chromatography (HPLC) systems. It offers quick tips, solutions for common problems across various detection methods, and helpful tools like a method transfer calculator.

**Highlights:** Instrument setup troubleshooting tips, Solutions for HPLC, nano LC, fluorescence, and charged aerosol detection, HPLC and UHPLC method transfer calculator, Links to relevant HPLC application content, Built-in sharing for team collaboration

**Features:** Vision Pro support

**In-app purchases:** none


### Loop

[App page](https://appshunter.io/ios/app/loop-screen-time-control/id6749889786)

Enhance focus and build healthier habits by controlling your phone usage. This app offers tools to limit distractions, track progress, and boost productivity through timed sessions and app blocking.

**Highlights:** Screen time limits, Study timer/Pomodoro mode, App blocker, Usage analytics, Habit tracking, Customizable intervals

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $2.99 | per 7 days |
| Monthly Subscription | $4.99 | per month |
| Yearly Subscription | $49.99 | per year |


## Frequently asked questions

### Is HPLC Troubleshooting Guide free?

HPLC Troubleshooting Guide is free to download, with no in-app purchases.

### Is Loop free?

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

### Which has better reviews, HPLC Troubleshooting Guide or Loop?

HPLC Troubleshooting Guide is rated higher. HPLC Troubleshooting Guide averages 5.0 out of 5 from 3 ratings, while Loop averages 4.8 from 4 ratings.

### Do HPLC Troubleshooting Guide or Loop have ads?

Neither HPLC Troubleshooting Guide nor Loop shows ads.

### Which is updated more often, HPLC Troubleshooting Guide or Loop?

HPLC Troubleshooting Guide ships an update every 2 months, and Loop every 10 days. Most recently, HPLC Troubleshooting Guide was updated on October 8, 2026 and Loop on October 12, 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.*