# Acidity vs echo

The clearest difference is price: Acidity at Free against echo's $2.99. Acidity also leads on device support (4 vs 1) and iOS requirement (15.0 vs 26.0). echo's advantage is update cadence (every 3 days vs every 4 months). On ads and in-app purchases there is nothing between them.

Acidity is free to download; echo costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Acidity ships an update every 4 months, echo every 3 days. The most recent releases landed on October 8, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Acidity | echo |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.2 (10 ratings)](https://appshunter.io/ios/app/acidity-view-page-archives/id6472630023/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 days** |
| Monetization | Free | — |
| Size | 8 MB | 3 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Octalwise](https://appshunter.io/developer/1717359953) | [Arjun Mahanti](https://appshunter.io/developer/1028057606) |

## What reviewers say

### Acidity

[App page](https://appshunter.io/ios/app/acidity-view-page-archives/id6472630023)

This utility extension for Safari provides quick access to archived versions of web pages. It allows users to manually navigate to archives or set up automatic redirection based on custom regex patterns.

**Highlights:** Access archived page versions, Toolbar action for quick access, Regex matching for automatic navigation, Safari extension

**Features:** Safari Extension, Vision Pro support

**In-app purchases:** none


### echo

[App page](https://appshunter.io/ios/app/echo-quick-notes/id6753983671)

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

**In-app purchases:** none


## Frequently asked questions

### Is Acidity free?

Acidity is free to download, with no in-app purchases.

### Is echo free?

echo costs $2.99, with no in-app purchases.

### Do Acidity or echo have ads?

Neither Acidity nor echo shows ads.

### Which is updated more often, Acidity or echo?

Acidity ships an update every 4 months, and echo every 3 days. Most recently, Acidity was updated on October 8, 2026 and echo on October 26, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*