Epicentral vs Isosceles Triangle PRO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Epicentral
Explore global earthquake patterns with real-time data and historical context. View recent seismic events on interactive maps and lists, with detailed summaries and links to official information. Understand current activity within the framework of historical seismicity.
- Real-time earthquake lists
- Interactive earthquake maps
- Daily, weekly, and monthly data views
- Event summaries and details
- Links to USGS earthquake information
- Historical earthquake catalogs
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Epicentral is a network-based educational application that displays lists and maps of earthquakes that occurred during the last day, week, or month. This version runs on iPhones, iPads, and Macs (as an iPad App) but requires iOS 26+ and macOS 26+. The data are served by the U.S. Geological Survey or the European-Mediterranean Seismological Centre (and three other seismological organizations). List updates take at most a few 10s of seconds. For each event, a summary of the event’s properties and relationship to nearby recent seismicity is presented. When using the USGS feeds, a link to the event-specific USGS earthquake information page is available. Several historical earthquake catalogs (sourced from the US Geological Survey) are included to provide context for more recent earthquakes. These catalogs can be used to put more recent activity in context.
Isosceles Triangle PRO
Calculate all properties of an isosceles triangle, whether acute or obtuse. Input known values to see formulas and results. Supports decimals, fractions, and step-by-step solutions with history saving and sharing.
- Calculate all isosceles triangle quantities
- Display formulas for calculations
- Supports acute and obtuse triangles
- Handles decimals and fractions
- Step-by-step solution display
- History function for saved calculations
- Adjustable decimal places
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The best app to calculate all quantities of an isosceles triangle. You must enter some quantities like an angle and a length. The algorithm searches the formulas of the missing quantities, shows them and calculates the results. The calculation of an isosceles triangle depends on one certain characteristic. Either it is obtuse angled or acute angled. Both is handled in this app. You just have to touch the button to switch the appearance of your isosceles triangle. The length of the decimal place can be changed. The algorithm shows when rounding or wrong values lead to an opposition. Decimals and fractions are supported. The solution is shown step by step. All calculations are stored in the history. The final solution can be shared. [ Content ] - all important quantities for the isosceles triangle - formulas for all important quantities of an isosceles triangle - infographic to illustrate the topic - search bar to find the desired quantity - history function to save the input - detailed solution - positive numbers, decimals and fractions are supported - changeable decimal place - changeable appearance of your triangle (obtuse angled - acute angled) - no ads! [ Usage ] - there are several fields for entering the values using a special keyboard - if values are missing, all fields are highlighted in orange - if values are conflicting or wrong (e.g. negative lengths), one affected field is highlighted in red - every value must be positive - if a value is no number, it is highlighted in red - the entries in the history can be deleted or sorted manually - if you select an entry in the history, it will be loaded automatically for the calculation - the entire history can be deleted by pressing a button - solutions can be shared [ Acute angled ] - gamma must be less than 90° - alpha must be greater than 45° and less than 90° [ Obtuse angled ] - gamma must be greater than or equal 90° and less than 180° - alpha must be less than or equal 45°
Screenshots
Verdict
The clearest difference is price: Epicentral at Free against Isosceles Triangle PRO's $2.99. Isosceles Triangle PRO's advantage is iOS requirement (15.0 vs 26.0). On update cadence, 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
Epicentral is free to download; Isosceles Triangle PRO costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 23, 2026 and October 21, 2026 respectively.
| Parameter | Epicentral | Isosceles Triangle PRO |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | 75.3% of reviews | — |
| Number of ratings | — | 2 — better |
| Update frequency | Monthly | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 16 MB | 180 MB |
| Age rating | 4+ | 4+ |
| Developer | Charles Ammon | Glindemann, Sennoun, Langer GbR |
Customer experience
Epicentral
Isosceles Triangle PRO
In-app purchases
Epicentral
No in-app purchases
Isosceles Triangle PRO
No in-app purchases
Questions
Is Epicentral free?
Is Isosceles Triangle PRO free?
Do Epicentral or Isosceles Triangle PRO have ads?
Which is updated more often, Epicentral or Isosceles Triangle PRO?
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