Tri vs Trajectory
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Tri
This utility app provides the formula and value for calculating triangle properties. It's designed for quick access to mathematical formulas related to triangles.
- Triangle formula display
- Value calculation
- Quick access utility
- Mathematical formulas
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App to display a formula and value of a triangle.
Trajectory
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Detects the trajectories of shapes moving along a parabolic path
Screenshots
Verdict
The clearest difference is update cadence: Trajectory at fortnightly against Tri's every 12 months. Tri's advantage is iOS requirement (15.6 vs 17.7.2). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Tri ships an update every 12 months, Trajectory fortnightly. The most recent releases landed on October 3, 2026 and September 24, 2026 respectively.
| Parameter | Tri | Trajectory |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 12 months | Fortnightly — better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 17.7.2 |
| Further details — not scored | ||
| Size | 4 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | Thirdware.jp | Hideaki Uchikoshi |
In-app purchases
Tri
No in-app purchases
Trajectory
No in-app purchases
Questions
Is Tri free?
Is Trajectory free?
Do Tri or Trajectory have ads?
Which is updated more often, Tri or Trajectory?
Other comparisons
