Every smart telescope ships with a first-party app that does the imaging job well enough — point at a target, watch a live stack build, save a JPEG. What none of them do is tell you where to point tonight given your sky, whether the clouds are actually going to clear at 11 PM instead of 9, or how much detail is hiding inside a stack that looks flat on your phone screen. Filling those gaps takes a small handful of free tools, and the same set works whether you own a Seestar S30 Pro, a Dwarf 3, a Vespera 3, or something more expensive.
Here's the shortlist that we actually keep on our phones and laptops, grouped by what they solve.
Planning: what to point at, and when
Stellarium (free, desktop and mobile). The open-source planetarium — free on desktop, a few dollars on iOS/Android, and worth the paid app just for offline sky maps. Set your location, set the time to tonight at 10 PM, and you can see exactly which targets are above the horizon and where the Moon will be in the way. The desktop version's Oculars plug-in lets you preview what a smart telescope's field of view will crop out of a wide nebula — useful for deciding whether the Veil Nebula fits in a single Seestar frame (it doesn't) or a Dwarf 3 mosaic (it does).
SkySafari (paid, ~$3-$60). The other serious planetarium app. SkySafari Plus (~$15) is the tier most owners land on: same-night target list, sortable by altitude and magnitude, plus a "tonight's best" filter that ignores anything below your horizon. If Stellarium's interface feels dense, SkySafari's is friendlier for phone-first planning.
Telescopius (free, browser). Free deep-sky target finder in the browser — no install. Filter by object type, magnitude, size, altitude at a specific time, and it'll give you a ranked list for tonight at your coordinates. Best for planning three nights ahead, not for pulling up in the driveway.
The core question all three answer: is my target actually up, and is the Moon washing it out? Getting that right ahead of time is worth more than any post-processing tweak later.
Weather: is it worth setting up
Clear Outside (free, browser and iOS/Android). Made by First Light Optics, built specifically for astronomers. Hour-by-hour forecast with a "total cloud cover" percentage that's the single most useful number in the app — if it's above 40% for your window, don't bother. Also shows low/medium/high cloud layers separately, which matters because a scope can shoot through thin high cirrus but nothing through low stratus.
Astrospheric (free, desktop and mobile). Fuller-featured than Clear Outside. Adds transparency (how murky the air is), seeing (how much the atmosphere is boiling — matters for planetary and Moon shots), the jet stream overlay, and the Kp index for aurora nights. Free tier is generous; the Pro subscription is only worth it if you're chasing weather windows more than once a week.
Windy (free, browser and mobile). Not astronomy-specific, but the layered radar and cloud animation is the most readable version out there. Good sanity check when Clear Outside and Astrospheric disagree — flip on the "clouds" layer and you can see the front moving in.
| Weather app | Best for | Free tier good enough? |
|---|---|---|
| Clear Outside | Fast go/no-go check before setup | Yes — full functionality |
| Astrospheric | Trip planning, target-night confidence | Yes — Pro is optional |
| Windy | Visual gut-check of incoming fronts | Yes — no paid tier for our use |
Dark-sky location: where to drive
Light Pollution Map (free, browser). The community-maintained World Atlas overlay on top of a Google-style map. Type in a spot, get a Bortle-class estimate — Bortle 4 sites drive a Seestar's dual-band filter results from "washed out" to "obvious structure" on the same target. Use it to pick a Friday-night drive destination before checking Astrospheric to confirm it'll be clear.
Dark Site Finder (free, browser). Similar idea, more polished UI, adds user-submitted site notes (parking, gates, cell coverage). Our dark-sky trip planning guide walks through how to combine this with a weather forecast to actually pull the trigger on a drive.
Processing: what the scope's app is holding back
The single biggest gap between smart-telescope owners is not what scope they own — it's whether they process the FITS or TIFF stacks the app quietly saves, or just export the JPEG. The JPEG is the app's best guess at a preview. The stack has three to five times more usable detail.
Siril (free, desktop). The open-source stacker and processor. Even if the scope has already stacked internally, Siril's post-processing — background extraction, color calibration, stretching — cleans up the result substantially. The 10-step scripted workflow it ships with runs on a Seestar or Dwarf 3 stack in about two minutes, no manual settings. See our Siril starter guide for exactly what to click first-run.
GraXpert (free, desktop, AI-optional). Purpose-built for one job: removing light-pollution gradients from a stack. Load a Siril-processed image, click "AI extraction", get a background-subtracted version that reveals faint nebulosity Siril's built-in tool can miss. Free, and the AI model download is a one-time step. Our GraXpert walkthrough has the settings that work best on smart-telescope data specifically.
PixInsight (paid, ~€250 lifetime). The deepest tool in the ecosystem. Every advanced technique tutorial YouTube surfaces eventually lands here. For most smart-telescope owners it's overkill — Siril plus GraXpert covers 95% of what a Seestar or Dwarf 3 stack can produce. Worth the price when you outgrow that pipeline, which for most owners is years in, if ever.
Photoshop or Affinity Photo (paid). Final finishing — curves, star reduction, a sharpening pass on the nebula core. Not required. A Siril + GraXpert result is genuinely presentable on its own. If you already own one for other work, use it; if not, don't buy one just for astro.
The starter stack
If you own a smart telescope and don't already have any of these, the four to install first — all free — are Stellarium (or SkySafari), Clear Outside, Siril, and GraXpert. In that order. Planning wins nights; weather saves setups; the two processing tools decide whether a stack becomes a keeper or a "meh." Everything else on this list is a refinement of one of those four steps.
Once that pipeline is running, our first-night guide is where most owners tie it all together — plan a target in Stellarium, check Clear Outside, shoot the scope's stack, run it through Siril and GraXpert the next morning. Do that ten times and you'll have a portfolio you're proud of, no matter which scope you started with.