Analyze the session
Open a Seestar folder or any valid FITS dataset and get a practical verdict, frame classification, score, confidence and diagnostics.
Seestar Companion 2.2.1
Know what your FITS data is worth.
Seestar Companion is the focused analysis tool for Seestar sessions and Universal FITS workflows. It helps you read session quality, identify weak frames, monitor live captures and decide what is worth stacking next before you waste time processing the wrong data.
Windows + macOS
Seestar S30 / S30 PRO / S50
Universal FITS analysis
Offline-first workflow
Session overview
quality score, verdicts, timeline, diagnostics and stacking guidance
The role in the ecosystem
A companion for the nights where the data decides everything.
Astro Imaging Toolbox is the broader Windows suite. Seestar Companion is the smaller, sharper tool: it exists to help you understand FITS sessions quickly, especially when you need a decision before stacking or while acquisition is still running.
Choose better frames
Use Best Stack Recommendation, frame diagnostics and problem maps to understand which frames help the final stack and which ones hurt it. For the problem-first version, see the Seestar FITS Frame Grader page.
Monitor live captures
Watch a FITS folder while frames arrive, follow quality trends and decide if the session is improving, declining or worth continuing.
Real workflow screens
From raw frames to a clear stacking decision.
The page now shows the actual job of the software: not a generic Seestar utility, but a FITS analysis workspace for deciding what to keep, reject, export and process.
Best Stack Recommendation
See the subset of frames most likely to produce the cleanest stack, with a recommendation you can act on.
Session Timeline
Understand when the session was clean, when it weakened and where clouds, haze, tracking or other issues began to matter.
Frame Diagnostics + Problem Map
Read why frames were marked as good, borderline or not good, then export the evidence for your workflow or support request.
Imaging Coach
Turn the analysis into a next step with practical suggestions based on the actual problems found in the session.
Workflow
Simple enough for the field, useful enough after the night.
Seestar Companion is built around one practical loop: load or monitor, understand the data, then export exactly what you need for the next tool.
Load or monitor
Open a Seestar session, a custom archive, a generic FITS folder or a live acquisition directory while new frames are still being written.
Read the evidence
Review score, verdict, frame quality, timeline, issue distribution, target history, archive benchmark and confidence labels.
Export the decision
Create frame lists, reports, cleanup folders, support packages and stacking-ready guidance without modifying your original data.
Version 2.2.1
More than post-session review.
The current version expands Seestar Companion into a broader decision assistant: useful before stacking, during a live capture and when building a cleaner archive over time.
Live Session Monitor
Follow score, verdict, trend and dominant issues while a session is still running.
Archive Progress
Understand how your saved sessions are maturing across targets, quality and recommendation strength.
Local Benchmark
Compare the current session against similar saved sessions or your broader local archive.
Workflow Export Helper
Export recommended and excluded frame lists, CSV inventories and helper files for external processing workflows.
Field Night Mode
Use the app more comfortably near the telescope with a lower-glare interface mode.
Universal FITS mode
Analyze any valid FITS dataset, even when it did not come from a Seestar folder structure.
Focused analysis software.
Seestar Companion is for session review, live monitoring, frame quality analysis, stacking decisions, reports, cleanup preparation and FITS workflow guidance. It is fast, local and built for repeated use after real observing nights.
Not a stacking suite.
It does not replace PixInsight, Siril, DeepSkyStacker or Astro Imaging Toolbox. It helps you decide what data deserves to go into those workflows. It also does not control Seestar hardware and does not upload your images to a cloud service.
One-time purchase
Seestar Companion 2.2.1
Windows and macOS license for Seestar and Universal FITS analysis. After purchase you receive a Stripe receipt immediately. Your personal license file and download links are sent by email within 24 hours, often much sooner.
- Seestar S30, S30 PRO and S50 workflows
- Universal FITS mode for valid FITS datasets
- Live Session Monitor and session timeline
- Best Stack Recommendation and diagnostics
- Reports, CSV inventory and workflow exports
- Offline-first design with signed licensing
EUR14.99 one-time
Seestar Companion is an independent product by Christian Fiore and is not affiliated with or endorsed by ZWO. "Seestar" is used only to describe compatibility. Please read the refund policy before purchase.
User feedback
Built around practical observing problems.
The product exists because small telescope workflows generate many frames, and the hard part is often deciding what is actually worth keeping.
Maurizio Tognini - Milano
"Un programma utile se vuoi fare astrofotografia seria col tuo Seestar, qualunque sia il modello. Ti fa capire a che livello di integrazione sei, soprattutto sui cieli inquinati. Lo consiglio vivamente se vuoi avere la certezza di lavorare in modo corretto."
FAQ
Before you buy.
Short answers for the common questions about compatibility, delivery and how Seestar Companion fits into your processing workflow.
Which systems are supported?
Windows 10/11 64-bit and macOS, including Apple Silicon and Intel Macs.
Is it only for Seestar data?
No. It is optimized for Seestar S30, S30 PRO and S50 workflows, but Universal FITS mode can analyze any valid FITS dataset.
Does it stack or process images?
No. Seestar Companion analyzes session and frame quality, then helps you decide what to stack in your preferred processing tool.
Does it upload my FITS files?
No. The workflow is offline-first. Your image data stays on your machine.
What do I receive after payment?
You receive a Stripe receipt immediately. Download links and your personal license file are sent by email within 24 hours, often much sooner.
Which languages are included?
The interface supports Italian, English, French, Spanish, Portuguese, German, Dutch, Polish, Simplified Chinese and Traditional Chinese.
Ready for cleaner decisions
Open the session, read the evidence, stack with more confidence.
Seestar Companion gives FITS sessions a clear verdict and a practical next step, without touching your original data.