Comparison

OpenSourceInitiative vs Acidity

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

★ 4.210 ratingsView app →

About

OpenSourceInitiative

Features

Read full description

Open source initiative website app For over 20 years the Open Source Initiative (OSI) has worked to raise awareness and adoption of open source software, and build bridges between open source communities of practice. As a global non-profit, the OSI champions software freedom in society through education, collaboration, and infrastructure, stewarding the Open Source Definition (OSD), and preventing abuse of the ideals and ethos inherent to the open source movement. Open source software is made by many people and distributed under an OSD-compliant license which grants all the rights to use, study, change, and share the software in modified and unmodified form. Software freedom is essential to enabling community development of open source software.

About

Acidity

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

Read full description

Acidity is a Safari extension for navigating to archived versions of pages. Quickly access page archives through a button in the toolbar. Specify regex matches to automatically redirect certain sites to archives.

Screenshots

OpenSourceInitiative1 screens

Acidity2 screens

Verdict

The call

The clearest difference is update cadence: OpenSourceInitiative at monthly against Acidity's every 4 months. OpenSourceInitiative also leads on iOS requirement (11.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

OpenSourceInitiative ships an update monthly, Acidity every 4 months. The most recent releases landed on September 28, 2026 and October 8, 2026 respectively.

Scorecard2 real differences · 8 level

OpenSourceInitiative versus Acidity: the parameters behind the verdict, then further details
Parameter	OpenSourceInitiative	Acidity
Price	Free	Free
Rating	—	4.2 (10 ratings) — better
Positive reviews	—	100.0% of reviews
Number of ratings	—	10 — better
Update frequency	Monthly — better	Every 4 months
Ads	No	No
In-app purchases	No	No
Monetization	—	Free
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod, Mac — better
Requires iOS	11.0 — better	15.0
Further details — not scored
Size	21 MB	8 MB
Age rating	4+	4+
Developer	Meir Tsvi	Octalwise

In-app purchases

None

OpenSourceInitiative

No in-app purchases

None

Acidity

No in-app purchases

Questions

Is OpenSourceInitiative free?

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

Is Acidity free?

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

Do OpenSourceInitiative or Acidity have ads?

Neither OpenSourceInitiative nor Acidity shows ads.

Which is updated more often, OpenSourceInitiative or Acidity?

OpenSourceInitiative ships an update monthly, and Acidity every 4 months. Most recently, OpenSourceInitiative was updated on September 28, 2026 and Acidity on October 8, 2026.