Relativity Widget vs Trajectory
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Relativity Widget
Visualize Einstein's theories of relativity directly on your home screen. Choose between Special Relativity to see time dilation in a spaceship or General Relativity to observe time differences near a black hole.
- Special Relativity visualization
- General Relativity visualization
- Time dilation display
- Home screen integration
- Customizable speed/distance settings
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Relativity Widget allows you to visualise Einstein's theories of relativity right on your home screen. Two modes : • Special Relativity: imagine that you are in a spaceship travelling at a chosen speed. If you travel fast enough, time will pass differently on earth... • General Relativity: you are on earth while a friend of yours went on a journey, in a spaceship, at a chosen distance to a Schwarzschild black hole. If you are close enough, time will pass differently in the spaceship... Relativity Widget clocks represent the difference in time flow, since midnight, between a high speed / high gravity experiencing reference frame and a low speed / gravity one, according to Einstein's theory of relativity.
Trajectory
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Detects the trajectories of shapes moving along a parabolic path
Screenshots
Verdict
The clearest difference is ads: Relativity Widget at none against Trajectory's shown. Relativity Widget also leads on iOS requirement (14.0 vs 17.7.2). Trajectory's advantage is update cadence (fortnightly vs every 6 months). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Relativity Widget ships an update every 6 months, Trajectory fortnightly. The most recent releases landed on October 30, 2026 and October 11, 2026 respectively.
| Parameter | Relativity Widget | Trajectory |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 6 months | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 14.0 — better | 17.7.2 |
| Further details — not scored | ||
| Size | 1 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | Eliott Morgensztern | Hideaki Uchikoshi |
In-app purchases
Relativity Widget
No in-app purchases
Trajectory
No in-app purchases
Questions
Is Relativity Widget free?
Is Trajectory free?
Do Relativity Widget or Trajectory have ads?
Which is updated more often, Relativity Widget or Trajectory?
Other comparisons
