AstroHelm vs Who's Calling + SPAM Guard

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 Who's Calling + SPAM Guard
Detail	AstroHelm	Who's Calling + SPAM Guard
What it does	Plate solving and push-to telescope navigation for smartphones	Android call screening app that reads unknown callers live while your phone rings
Stage	Not given	Not given
Founded	Not given	Not given
Based in	US	AU
Pricing model	Freemium	Paid
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	One-time purchase per country with minute-based pricing shown in local currency on Google Play. 10-minute free trial in US, Canada, Puerto Rico, Australia, Chile, Israel, Mexico; small one-off fee elsewhere. Top-up minute packs available.
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	Live transcripts of unknown callers while phone rings Real-time cross-language translation in 56 languages Spam risk scoring and global spam database AI assistant answers calls and identifies callers Custom business greeting for incoming calls Dual SIM support with independent settings Call screen customization with 144 design options On-device translation with no data upload
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	Complete privacy with no data sharing or ads Works on any Android phone including Samsung, Motorola, Oppo, Pixel Real-time multilingual transcription and translation Conditional call forwarding preserves normal calling patterns
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	11 +7 (up) since last check
Trust Flow (Majestic)	7	7
Citation Flow (Majestic)	28	16
Referring domains (Majestic)	65	6

6 details filled in for both companies.

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