# Polar Scope Align vs NAPA

The clearest difference is in-app purchases: NAPA at none against Polar Scope Align's 3. NAPA also leads on ads (none vs shown). Polar Scope Align's advantage is ratings volume (173 vs 3) and review sentiment (91% vs 75%). On price, rating, update cadence and device support there is nothing between them.

Both are free to download. Polar Scope Align sells 3 one-off in-app purchases. NAPA asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for Polar Scope Align against 4.7 for NAPA. That said, the two scores are not equally well evidenced: Polar Scope Align has 173 ratings behind it against 3, so its average is the more settled of the two. Written reviews are what separate them: 91% of Polar Scope Align's written reviews are positive against 75% of NAPA's.

Polar Scope Align ships an update every 6 weeks, NAPA every 2 months. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Polar Scope Align | NAPA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (173 ratings)](https://appshunter.io/ios/app/polar-scope-align/id970157965/reviews)** | [4.7 (3 ratings)](https://appshunter.io/ios/app/napa-star-map/id6475964108/reviews) |
| Number of ratings | **173** | 3 |
| Positive reviews | **91.4% of reviews** | 75.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 24 MB | 287 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dimitrios Kechagias](https://appshunter.io/developer/970157964) | [National Astronomical Research Institute of Thailand (Public Organization)](https://appshunter.io/developer/1725468782) |

## What reviewers say

### Polar Scope Align

[App page](https://appshunter.io/ios/app/polar-scope-align/id970157965)

This app calculates the precise position of celestial poles in your telescope's polar scope reticle for accurate alignment. It supports a wide range of reticles and corrects for atmospheric refraction, offering precision even at lower latitudes. Features include night mode, moon phase, and astronomical databases.

**Highlights:** Polaris/Sigma Octantis position calculation, Atmospheric refraction correction, Reticle centering error correction, Supports numerous reticle types, Red-color night mode, Moon phase and astronomical databases

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tip 1x | $0.99 | one-time |
| Tip 4x | $3.99 | one-time |
| Tip 10x | $9.99 | one-time |

**What reviewers like**

- 🎯 Extensive reticle options for various telescope mounts
- 👍 User-friendly and intuitive interface
- 🆓 Powerful free version with no popup ads
- 🔴 Red night vision mode preserves dark adaptation
- 📍 Accurate GPS-based location detection

**What reviewers complain about**

- 🐛 Inconsistent accuracy with metal mounts/tripods
- 📱 Font size too small for comfortable reading
- 🎯 Center dot in reticle obscures precise alignment
- 📍 Limited effectiveness for southern hemisphere (Sigma Octantis is dim)
- ❓ Steep learning curve for beginners without proper guidance

**Reported bugs**

- Date and time dial do not match correctly
- GMT and LST times appear to be switched
- App crashes or fails to initialize for some users
- Alignment accuracy varies inconsistently between sessions
- Location detection issues with cell tower vs GPS

**Requested features**

- Online video tutorials demonstrating all features
- Remove or reduce center dot size in reticle
- Larger, bolder font options for better readability
- Brighter star options for southern hemisphere alignment
- Smaller ad button or ad customization


### NAPA

[App page](https://appshunter.io/ios/app/napa-star-map/id6475964108)

Explore the night sky with this astronomy and planetarium app. Identify stars, constellations, and planets by pointing your device at the sky. Plan future observations by adjusting the time and date.

**Highlights:** Point and observe celestial objects, Star map functionality, Time adjustment for observation planning, Simulate planet positions, Locate specific celestial objects, Real images of deep sky objects

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Polar Scope Align free?

Polar Scope Align is free to download, with in-app purchases available.

### Is NAPA free?

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

### Which has better reviews, Polar Scope Align or NAPA?

Polar Scope Align is rated higher. Polar Scope Align averages 4.7 out of 5 from 173 ratings, while NAPA averages 4.7 from 3 ratings.

### Do Polar Scope Align or NAPA have ads?

Polar Scope Align shows ads; NAPA does not.

### Which is updated more often, Polar Scope Align or NAPA?

Polar Scope Align ships an update every 6 weeks, and NAPA every 2 months. Most recently, Polar Scope Align was updated on October 24, 2026 and NAPA on October 9, 2026.

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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.*