# Sputnik! vs Graph Calc Plus

The clearest difference is price: Sputnik! at Free against Graph Calc Plus's $2.99. Sputnik! also leads on update cadence (every 5 months vs every 39 months). Graph Calc Plus's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Sputnik! is free to download; Graph Calc Plus costs $2.99 up front. Sputnik! sells 1 one-off in-app purchase. Graph Calc Plus asks for nothing beyond the download.

Sputnik! ships an update every 5 months, Graph Calc Plus every 39 months. The most recent releases landed on September 23, 2026 and December 13, 2025 respectively.

## The numbers

| Metric | Sputnik! | Graph Calc Plus |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.7 (731 ratings)](https://appshunter.io/ios/app/sputnik/id393001070/reviews)** | — |
| Number of ratings | **731** | — |
| Positive reviews | 92.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 39 months |
| Monetization | Ad-supported | — |
| Size | 35 MB | 1 MB |
| Requires iOS | 14.0 | 14.0 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Applicate Ltd](https://appshunter.io/developer/299117183) | [Heng Jia Liang](https://appshunter.io/developer/1532000635) |

## What reviewers say

### Sputnik!

[App page](https://appshunter.io/ios/app/sputnik/id393001070)

Track the International Space Station and bright satellites with precise timing and location data. Get second-by-second countdowns, set reminders, and view satellite paths in the night sky. Supports offline calculations and sharing sightings.

**Highlights:** Accurate satellite and ISS sighting predictions, Starlink satellite train detection, Second-by-second countdowns, Sighting reminders, Compass direction and elevation display, Night sky path visualization, Offline calculations

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Go ad-free | $0.99 | one-time |

**What reviewers like**

- 🚀 Accurate satellite tracking
- 👍 Easy to use interface
- 🔭 Supports tracking of various satellites (ISS, Hubble, Starlink)
- ⏰ Provides countdown and reminders for sightings

**What reviewers complain about**

- 🐛 App not working/crashing for some users
- 🔍 Unclear information about satellite visibility (e.g. what 'enters Earth's shadow' means)
- 🔧 Difficulty updating satellite data
- 🙈 Dark mode text visibility issues

**Reported bugs**

- App reporting 'No Sightings' for all categories
- Null check errors when selecting satellite sightings
- Issues with location settings and data updates

**Requested features**

- Add support for more satellite types
- Improve sky chart visualization and orientation
- Provide filtering options (e.g. by elevation, magnitude)
- Implement automatic data updates


### Graph Calc Plus

[App page](https://appshunter.io/ios/app/graph-calc-plus/id1612916130)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sputnik! free?

Sputnik! is free to download, with in-app purchases available.

### Is Graph Calc Plus free?

Graph Calc Plus costs $2.99, with no in-app purchases.

### Do Sputnik! or Graph Calc Plus have ads?

Neither Sputnik! nor Graph Calc Plus shows ads.

### Which is updated more often, Sputnik! or Graph Calc Plus?

Sputnik! ships an update every 5 months, and Graph Calc Plus every 39 months. Most recently, Sputnik! was updated on September 23, 2026 and Graph Calc Plus on December 13, 2025.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*