Polar Scope Align vs Butterfly Identifier
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Polar Scope Align
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.
- 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
Read full descriptionHide full description
Polar Scope Align is a free, ad-supported polar alignment app for iPhone and iPad. It calculates the position of Polaris or σ Octantis in your polar scope reticle for your location, date and time, helping you get a quick and accurate polar alignment with an equatorial mount. POLAR SCOPE ALIGNMENT • Accurate Polaris and Sigma Octantis position for your date and location • Atmospheric refraction correction for better accuracy, especially at lower latitudes - readings may differ slightly from simpler apps that skip this correction, but will agree with precise sources (USNO, scientific software) • Automatic time and location • Manual location support • Reticle centering-error measurement and correction • Zero-position help for common Celestron / Sky-Watcher / Orion style reticles • Full red night-mode interface SUPPORTED RETICLES Polar Scope Align supports 35+ polar scope and finder reticle types, including: iOptron, Astro-Physics RAPAS & PASILL, Takahashi (EM-10/11/200/400/500, NJP, PM-1, P2-Z), Sky-Watcher / Orion (including EQ6/AZ-EQ and Star Adventurer), Celestron, Meade, EXOS2, Bresser, Vixen (Atlux/SX/SXD/SXP/AXD/GP/GP-DX, Polarie), Astrotrac, Losmandy, Kenko, Avalon, Konus, Telrad, Rigel QuikFinder, and several older polar finders (Tuthill, Explore Scientific, Meade 9x60, Vixen Polaris, Celestron 7x50, Carton Optical). OBSERVING TOOLS The free version also includes: • Moon phase • Messier, Caldwell and bright-star database • DSS image downloads for included database objects • Saved, editable and printable DSO lists • 8 astronomy calculators for observing and imaging • Sample Pro tools available from Settings, including aurora forecast • iOptron WiFi Connect - report mount status, set mount Time/Date/Location LOOKING FOR ALIGNMENT WITHOUT A POLAR SCOPE? Polar Scope Align Pro adds the advanced tools many users search for: • Daytime / No Polar Scope Alignment • Camera Azimuth Calibration using the Sun, Moon, planets or bright stars • Laser / Hop Align for night alignment when Polaris is blocked • Push To / manual GoTo for non-GoTo telescopes • Live sky maps for Daytime Alignment, Laser / Hop Align, Push To and Hop To • Full 22,000+ object DSO database • Xasteria astro weather, aurora, satellite passes and widgets • 30+ calculators • Bubble level, compass and iOptron WiFi mount control • Apple Watch companion app • No ads If you only need accurate polar-scope alignment, this free version is a capable tool. If you want alignment without a polar scope, observing planning, weather and field tools, Pro is the complete version.
Butterfly Identifier
Instantly identify butterflies and moths from photos with a vast database and high accuracy. Unlock full access to all features with a monthly subscription.
- Instant photo processing
- High accuracy identification
- Extensive database
- Monthly subscription for full access
Read full descriptionHide full description
Do you want to identify any butterfly by photo? Our app is what you need! - Instant processing - High accuracy - Big database Subscribe to get full access: $9.99 per month, cancel anytime Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://igorkrug.site/privacy.html
Screenshots
Verdict
The clearest difference is review sentiment: Polar Scope Align at 91% against Butterfly Identifier's 0%. Polar Scope Align also leads on rating (4.7 vs 1.0) and monetization model (free with in-app purchases vs subscription). Butterfly Identifier's advantage is ads (none vs shown). On price, in-app purchases, device support and iOS requirement 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. Polar Scope Align sells 3 one-off in-app purchases and Butterfly Identifier sells 1 in-app purchase, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.
Polar Scope Align holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Polar Scope Align has 171 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 91% of Polar Scope Align's written reviews are positive against 0% of Butterfly Identifier's.
| Parameter | Polar Scope Align | Butterfly Identifier |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (171 ratings) — better | 1.0 (2 ratings) |
| Positive reviews | 91.3% of reviews — better | 0.0% of reviews |
| Number of ratings | 171 — better | 2 |
| Update frequency | Every 2 months | — |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases — better | Subscription |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 23 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Dimitrios Kechagias | Tolkyn Raimbayeva |
Customer experience
Polar Scope Align
Butterfly Identifier
Bugs and requests
Polar Scope Align
Reported bugs
6 issues- 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
Show 1 moreShow fewer
- Reticle display not rendering properly in some cases
Requested features
7 requests- 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
Show 2 moreShow fewer
- Better beginner onboarding and instructions
- More robust alternative alignment methods for southern hemisphere
Butterfly Identifier
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Polar Scope Align
- Tip 1x$0.99
- Tip 4x$3.99
- Tip 10x$9.99
Butterfly Identifier
- Butterfly ID Full Access$9.991 Month
Questions
Is Polar Scope Align free?
Is Butterfly Identifier free?
Which has better reviews, Polar Scope Align or Butterfly Identifier?
Do Polar Scope Align or Butterfly Identifier have ads?
Other comparisons













