Comparison

Cygnus Astro vs GuideWatch

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

Head to head
About

Cygnus Astro

Control your astrophotography equipment remotely from your mobile device. This app provides a touch-friendly interface to connect, monitor, and manage your N.I.N.A. software and connected gear, simplifying your setup in the field.

Highlights
  • Remote equipment control
  • N.I.N.A. software integration
  • Mobile touch interface
  • Real-time exposure preview
  • Open-source and free
Features
Read full description

Cygnus Astro Get ready to do astrophotography from your mobile phone! Cygnus Astro enables astrophotographers to use a mobile touch-friendly interface to control their equipment from N.I.N.A. software. No matter if you have a laptop, or a mini PC, you can replace that complex UI with a mobile app. When in the field, you're able to connect, monitor, and control all your astrophotography equipment without worrying about a desktop interface. Turn your PC on, and forget about it! Key features: - Connect your equipment (mount, camera, electronic focuser, etc.) using a simple button - Launch and monitor your advance sequence - Perform your Three-Point Polar Alignment without having to hold your laptop - Preview your exposures in real-time - Fully open-source. This app is, and will aways be free Cygnus Astro uses N.I.N.A. PC software and the N.I.N.A. Advanced API plugin to communicate with your PC. This app is not a replacement for N.I.N.A. or your PC.

About

GuideWatch

Features
Read full description

GuideWatch puts your PHD2 guiding session on your wrist. If you run NINA to control your astrophotography rig, you already know the drag of walking back to the laptop every few minutes just to check whether guiding is still holding steady. GuideWatch connects directly to either PHD2 or NINA over your local Wi-Fi network and shows you what matters, right on your Apple Watch: • Live guiding graph: see RA/Dec error trends update in real time, just like the graph in PHD2 itself • RMS error and key guiding stats at a glance, with optional haptic alerts if guiding fails • Simple connection status, so you know instantly if guiding has dropped out • A quick settings screen to connect to PHD2 or NINA on your controller's IP address and port No need to keep walking back to a screen, break your dark adaptation, or leave a laptop running somewhere inconvenient (just glance at your wrist). GuideWatch also includes a simulation mode, so you can explore the app and its guiding display before connecting it to a live session. Requirements: GuideWatch needs either PHD2 or a NINA instance with the Advanced API module running on the same local network. GuideWatch does not control PHD2, NINA or your imaging session; it's a read-only guiding monitor designed to keep you informed without needing to touch your imaging laptop.

Screenshots

Cygnus Astro4 screens
GuideWatch1 screens

Verdict

The call

The clearest difference is update cadence: Cygnus Astro at every 5 days against GuideWatch's fortnightly. Cygnus Astro also leads on iOS requirement (15.1 vs 26.5). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Cygnus Astro ships an update every 5 days, GuideWatch fortnightly. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 8 level
Cygnus Astro versus GuideWatch: the parameters behind the verdict, then further details
ParameterCygnus AstroGuideWatch
PriceFreeFree
Rating4.3 (4 ratings) — better—
Positive reviews66.7% of reviews—
Number of ratings4 — better—
Update frequencyEvery 5 days — betterFortnightly
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS15.1 — better26.5
Further details — not scored
Size32 MB4 MB
Age rating4+4+
DeveloperChristopher VenturaCambridge AI Works Ltd.

In-app purchases

None

Cygnus Astro

No in-app purchases

None

GuideWatch

No in-app purchases

Questions

Is Cygnus Astro free?
Cygnus Astro is free to download, with no in-app purchases.
Is GuideWatch free?
GuideWatch is free to download, with no in-app purchases.
Do Cygnus Astro or GuideWatch have ads?
Neither Cygnus Astro nor GuideWatch shows ads.
Which is updated more often, Cygnus Astro or GuideWatch?
Cygnus Astro ships an update every 5 days, and GuideWatch fortnightly. Most recently, Cygnus Astro was updated on October 20, 2026 and GuideWatch on October 24, 2026.

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