# Protocol Zero vs Quote4U

The clearest difference is ads: Quote4U at none against Protocol Zero's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Protocol Zero sells 5 in-app purchases, starting at $12.99 per month and Quote4U sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Protocol Zero ships an update every 4 days, Quote4U every 3 days. The most recent releases landed on September 27, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Protocol Zero | Quote4U |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (182 ratings)](https://appshunter.io/ios/app/protocol-zero-sleep-sounds/id6755014746/reviews)** | — |
| Number of ratings | **182** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 days | **Every 3 days** |
| Monetization | Subscription | — |
| Size | 123 MB | 3 MB |
| Requires iOS | 17.2 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 12+ | 4+ |
| Developer | [HumanOS LLC](https://appshunter.io/developer/1851339721) | [Laird Dekkers](https://appshunter.io/developer/1858030340) |

## What reviewers say

### Protocol Zero

[App page](https://appshunter.io/ios/app/protocol-zero-sleep-sounds/id6755014746)

This app provides a personalized daily plan to improve sleep quality, incorporating science-backed techniques and sleep sounds. It guides users through setting consistent wake times, managing caffeine intake, and activating wind-down routines for better rest.

**Highlights:** Personalized daily sleep plan, Sleep sounds (white noise, rain), Consistent wake time guidance, Caffeine cutoff reminders, Wind-down mode, CBT-I techniques

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Protocol Zero Monthly | $12.99 | per month |
| Protocol Zero Annual Starter | $19.99 | per year |
| Protocol Zero Annual | $29.99 | per year |
| Protocol Zero Pro | $39.99 | per year |
| Protocol Zero Pro | $59.99 | per year |


### Quote4U

[App page](https://appshunter.io/ios/app/quote4u/id6756026415)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Founder's Club | $1.99 | one-time |


## Frequently asked questions

### Is Protocol Zero free?

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

### Is Quote4U free?

Quote4U is free to download, with in-app purchases available.

### Do Protocol Zero or Quote4U have ads?

Protocol Zero shows ads; Quote4U does not.

### Which is updated more often, Protocol Zero or Quote4U?

Protocol Zero ships an update every 4 days, and Quote4U every 3 days. Most recently, Protocol Zero was updated on September 27, 2026 and Quote4U on September 15, 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.*