Comparison

Polar Scope Align vs Bolt Hunter

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read 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.

About

Bolt Hunter

Features
Read full description

Bolt Hunter is a companion app for the Bolt Hunter lightning camera trigger. This app is used to configure and control your Bolt Hunter, allowing you to capture lightning with precise timing and improved reliability. Key Features: - Connect to your Bolt Hunter device via Bluetooth - Adjust sensitivity and trigger settings - Control interval shooting modes - Configure Night Mode and exposure behavior - Calibrate camera shutter lag - Monitor device status and settings in real time - View real-time lightning data to improve your settings Important: This app requires a Bolt Hunter device to function. Hardware is sold separately. Bolt Hunter is designed for photographers who want consistent lightning captures without missed shots, in both daytime and nighttime conditions.

Screenshots

Polar Scope Align4 screens
Bolt Hunter4 screens

Verdict

The call

The clearest difference is in-app purchases: Bolt Hunter at none against Polar Scope Align's 3. Bolt Hunter also leads on ads (none vs shown). Polar Scope Align's advantage is iOS requirement (13.0 vs 15.0). On price, update cadence 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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 8, 2026 and September 15, 2026 respectively.

Scorecard3 real differences · 7 level
Polar Scope Align versus Bolt Hunter: the parameters behind the verdict, then further details
ParameterPolar Scope AlignBolt Hunter
PriceFreeFree
Rating4.7 (171 ratings) — better—
Positive reviews91.2% of reviews—
Number of ratings171 — better—
Update frequencyEvery 2 monthsEvery 2 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size23 MB94 MB
Age rating4+4+
DeveloperDimitrios KechagiasMotion Horizons LLC

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 more
  • 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 more
  • Better beginner onboarding and instructions
  • More robust alternative alignment methods for southern hemisphere

Bolt Hunter

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Polar Scope Align

One-time3
  • Tip 1x$0.99
  • Tip 4x$3.99
  • Tip 10x$9.99
None

Bolt Hunter

No in-app purchases

Questions

Is Polar Scope Align free?
Polar Scope Align is free to download, with in-app purchases available.
Is Bolt Hunter free?
Bolt Hunter is free to download, with no in-app purchases.
Do Polar Scope Align or Bolt Hunter have ads?
Polar Scope Align shows ads; Bolt Hunter does not.
Which is updated more often, Polar Scope Align or Bolt Hunter?
Polar Scope Align ships an update every 2 months, and Bolt Hunter every 2 months. Most recently, Polar Scope Align was updated on September 8, 2026 and Bolt Hunter on September 15, 2026.

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