Comparison

OpenSourceInitiative vs Trajectory

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

Head to head

About

OpenSourceInitiative

Features

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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

Trajectory

Features

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Detects the trajectories of shapes moving along a parabolic path

Screenshots

OpenSourceInitiative1 screens

Trajectory1 screens

Verdict

The call

The clearest difference is ads: OpenSourceInitiative at none against Trajectory's shown. OpenSourceInitiative also leads on device support (3 vs 1) and iOS requirement (11.0 vs 17.7.2). Trajectory's advantage is update cadence (fortnightly vs monthly). On price and in-app purchases 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, Trajectory fortnightly. The most recent releases landed on September 28, 2026 and October 11, 2026 respectively.

Scorecard4 real differences · 2 level

OpenSourceInitiative versus Trajectory: the parameters behind the verdict, then further details
Parameter	OpenSourceInitiative	Trajectory
Price	Free	Free
Update frequency	Monthly	Fortnightly — better
Ads	No — better	Yes
In-app purchases	No	No
Devices	iPhone, iPad, iPod — better	iPhone
Requires iOS	11.0 — better	17.7.2
Further details — not scored
Size	21 MB	36 MB
Age rating	4+	4+
Developer	Meir Tsvi	Hideaki Uchikoshi

In-app purchases

None

OpenSourceInitiative

No in-app purchases

None

Trajectory

No in-app purchases

Questions

Is OpenSourceInitiative free?

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

Is Trajectory free?

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

Do OpenSourceInitiative or Trajectory have ads?

Trajectory shows ads; OpenSourceInitiative does not.

Which is updated more often, OpenSourceInitiative or Trajectory?

OpenSourceInitiative ships an update monthly, and Trajectory fortnightly. Most recently, OpenSourceInitiative was updated on September 28, 2026 and Trajectory on October 11, 2026.