AstroHelm vs Roll Sorter

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

AstroHelm compared with Roll Sorter
Detail	AstroHelm	Roll Sorter
What it does	Plate solving and push-to telescope navigation for smartphones	Photo Cleaner: Swipe to Delete
Stage	Not given	Not given
Founded	Not given	Not given
Based in	US	Not given
Pricing model	Freemium	Free trial
Pricing	Free with optional one-time purchases: Plus $9.99 (Messier and Caldwell catalogs, Bayer or Flamsteed designated stars), Pro $29.99 (everything in Plus, NGC and IC catalogs, remote control, ASCOM Alpaca/INDI/LX200/Stellarium connections), Pro Beta pricing $24.99	Free for 3 days with all features. After trial: free tier with unlimited swiping, resuming and albums, max 50 photos per day to trash. Lifetime pass: one-time purchase for unlimited trash and access to duplicate, similar photo and screenshot tools.
Key features	Live plate solving with accuracy up to within 10 arcseconds Computes coordinates in less than a second Immune to magnetic field interference Works in light-polluted skies Complete offline operation Personalized guide to tonight's best targets Remote control between devices (iOS) Integration with Stellarium and SkySafari	Swipe to delete photos and mark for trash Find and remove duplicate photos Identify similar photos with sharpest shot suggested Detect screenshots and large videos Month-by-month library browsing Full-screen photo zoom and preview Unlimited undo actions 30-day Recently Deleted recovery Light and dark mode themes Multi-language support
What makes it different	On-device plate solving eliminates compass and gyroscope drift and lags that traditional astronomy apps experience Sub-arcminute precision navigation that outperforms standard planetarium apps No subscription required, only optional one-time purchases Compatible with existing telescope and equipment without proprietary hardware lock-in	One-time lifetime purchase with no subscription or auto-charges All processing happens locally with no account, ads, or uploads Free to use core features with no limit after trial period Lightbox-style single photo review interface Safe deletion with 30-day recovery window
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	5 no change since last check	Not checked yet no change since last check
Trust Flow (Majestic)	7	0
Citation Flow (Majestic)	28	0
Referring domains (Majestic)	65	0

5 details filled in for both companies.

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