u/hypePG

Built this solo over the past months.

Subpoint links the ISS crew's daily activity to the experiment, the crew involved and the station module it happens in, so you see what's happening aboard, not just where the dot is.

On-device orbit math (SGP4 from live TLEs), a live 3D globe with day/night terminator and cloud cover, 3D module interiors you can step into, pass predictions for your location, plus expeditions, spacewalks and astronaut profiles. Frontend is fully vibecoded, interesting part is the data pipeline.

No account, no ads, no tracking, location stays on device.

0.99$/€ launch price (regular 3.99$/€). Hit me Up for some promo codes.

Links in comments.

App Name: Subpoint: ISS Atlas

What it does: Subpoint is an ISS companion app that shows not just where the station is, but what the crew is actually doing each day, structured from NASA's Space Station Blog and linked to the experiments, modules and crew involved. It also ties each day to roughly where the ISS was over Earth at the time, with a live 3D globe and pass predictions for your location.

Key Features:

• Live 3D globe (sub-satellite point, day/night terminator, cloud cover) with real on-device SGP4 orbit math and visible-pass predictions for your location
• 3D module interiors you can step into and tap the equipment racks, plus a daily activity feed linked to experiments, modules and crew
• Visiting Vehicles & Spacewalks timeline, 70+ expeditions and astronaut profiles, all with no ads, no tracking, no account

Goal: Launch

Giveaway: I've got free promo codes (redeem straight in the Play Store, no purchase needed). Reply with a comment or send me a DM and I'll send one over.

Link: https://play.google.com/store/apps/details?id=space.subpoint.app

Honesty note for the dev crowd: a lot of the code was AI-assisted, but the architecture, the data pipeline and the domain decisions are mine. The blog is parsed deterministically for the experiment and module IDs (those are facts), then a grounded LLM only writes the readable narrative, so the critical fields can't be hallucinated. Some in-app text is LLM-rewritten but grounded in official NASA sources, disclosed in-app. Not affiliated with or endorsed by NASA. Constructive feedback very welcome, hit me with specifics.

In all ISS trackers I have tried, you can see where the station is. And none of them answers my actual question: what is the crew doing up there, and in which modules of the station are they doing it?

So I made Subpoint. The application breaks down the daily activity on the basis of NASA's Space Station Blog and assigns each day to the list of experiments, the module in which they were carried out (Destiny, Columbus, Kibo and the others), and the crew member responsible. Instead of a dot on the map, each day is represented as such an experiment, conducted by such a crew member, in such a module. Moreover, each day is assigned with the approximate position of the station above the Earth at this moment, but more interesting for me is the where inside the station.

The orbiting part is real and on-device: SGP4 propagation from live TLEs (Celestrak / Space-Track), therefore the subsatellite point, the altitude, the speed and your local visible-pass predictions are calculated on your device. You location never leaves the device. Around this there is a live 3D globe with the line between the day and night side, the current weather and sun tracking solar panels, 3D module interiors that can be walked into and tapped the racks with equipment, timeline of all the visiting vehicles and EVA, and profiles of all 70+ expeditions and astronauts that were involved.

It got its name from the subsatellite point – the exact place on Earth directly under the station. Not just the tracker, but the story behind the dot in the sky.

I made this application myself during last several months. There are no ads, no tracking and no analytics in it. This is a paid application (it costs 0.99$ during first weeks after the launch, then it will cost 3.99$), but I am not trying to promote it. Still i have some Promocodes for any fellow space nerd. I would like to hear some feedback from those who are interested in station operations. It will be great to discuss data pipeline or orbital calculations in the comments. Video below.

I've been parsing the daily NASA Space Station Blog and linking each activity to its experiment, crew member and station module, then tying it to the on-device orbit position at that timestamp. The result is an app where a day of station activity is fully connected: what, who, which module, over where.

Stage 1 of the pipeline is deterministic href-parsing of the blog's catalog links (experiment IDs, module slugs), so the critical fields can't hallucinate. Stage 2 uses an LLM grounded on those facts for the narrative and crew mapping. Happy to explain the rest, if you are interested.

No backend, no account. Links in comments, happy to go deep on the parsing.

For several months now, I have been working on Subpoint, a new ISS application that is more than just “here’s the dot on the map.”

It extracts the daily NASA Space Station Blog feed, matches the activities with the respective experiment, the crew member and the ISS module they take place in, then maps that to the current orbit to show you what was being done, in which module, and over which part of the Earth.

Among other features: real-time orbit computation (SGP4, up-to-date TLEs), a 3D globe that you can time scrub, 3D walkable interiors of the modules, pass predictions for your location. No account, no back end, no tracking.

I created some codes for space enthusiasts to get the app for free. Hit me up if you are interested and I send you one! Link in the comments. Looking for some feedback! I’d be happy to answer any questions regarding the data pipeline or orbital computations - this is definitely the part I enjoyed the most.