Help and FAQ

T-Minus Zero is a launch tracking and reference app for people who want a fast, trustworthy read on upcoming launches, timing changes, and related context without hype.

You can browse the public launch schedule, search, filters, news, reference pages, and the public calendar without Premium. In the iPhone or iPad app, you can turn on T-10 push reminders for eligible countdown-ready launches. Premium adds device alert controls, follows, widgets, Live Activity, feeds, embeds, AR Pad, and deeper launch-detail tools.

On the web, sign in to manage Premium access, billing, saved views, and browser notifications. Browsing the public schedule does not require an account.

Open Support from the app or website for contact options, helpful links, and privacy resources. Include what you were doing and which launch or screen you were on.

Premium includes AR Pad for eligible launches, richer alert controls, follows, saved filter presets, calendar exports, recurring calendar feeds, RSS/Atom feeds, embeddable launch cards, change history, and weather and viewing context where data is available. The iOS and Android apps sell Premium separately for their own features.

Yes. T-Minus Zero keeps public discovery open: the shared live launch schedule, launch detail basics, search, filters, and public calendar browsing stay available without Premium.

No. AR Pad appears for eligible launches when AR data is available, and it is positioned for mobile and tablet use rather than desktop viewing.

On the website, launch alerts need Premium: web push on supported browsers, up to three reminder times, and launch-change alerts, including scrubs, status changes, NET changes, state alerts, all-launch rules, and single-launch rules. Notifications remain best effort. The iOS and Android apps manage their own alerts and sell Premium separately.

Saved filters are named launch-feed views, such as a state, provider, pad, status, sort, and date range. Follows are My Launches rules for tracking an exact launch, provider, rocket, pad, launch site, or state.

Yes. One-off add-to-calendar and recurring calendar feeds are Premium workflow tools. Public calendar browsing remains available.

Yes. Cancel anytime from Billing. Access stays active through the end of your current billing period.

On the web, sign in to the account that owns your Premium purchase to use account-backed access across supported browsers. Native purchases and device preferences are managed separately in the mobile app.

The Today feed focuses on U.S. pads for the first iOS release. Search and filter views can include all available regions when selected.

NET means "No Earlier Than" and marks the earliest possible liftoff. If a provider publishes date-only or low-precision timing, the UI shows Time TBD and countdowns stay hidden until hour/minute precision is available.

Launch times render in your local timezone when the app can confirm your location. On launch detail pages, if location access is unavailable, timing falls back to local pad time and the timing summary opens a reference popup that explains that state.

Timing and status changes appear after the next ingest/refresh cycle. Cards reflect HOLD and SCRUB states, and change events are tracked for alert workflows.

Today is the main launch schedule view on iPhone and the web home feed. It highlights upcoming launches, status, and timing with pull-to-refresh for a newer snapshot.

The featured launch is the next relevant mission on Today. Widgets and some shortcuts can open that launch, while Live Activity auto-tracking uses the soonest launch you follow.

Search finds launches, providers, pads, rockets, news, and catalog entities. Use filters on the launch feed to narrow by region, provider, pad, status, and date range.

Saved filters are Premium named views of the launch list. They remember your sort, region, provider, pad, status, and date choices so you can reopen the same browse setup quickly.

Open a launch or the Following tab, choose what matters to you, then tap Follow. Following is a Premium feature on iPhone.

You can follow a provider, rocket, pad, launch site, or state so future matching launches are tracked automatically.

Turn on the active follows bubble on Today to show only launches that match your follows. Turning it off shows the full feed without removing your follows.

Return to the same follow source and turn Follow off. Removing a follow stops future matches from using that source in follow-based alerts, calendars, widgets, and Live Activities.

Premium follows shape Today, alerts, calendar feeds, widgets, and Live Activities when those features are turned on. iPhone widgets only show launches matched by your follows or a launch you pick manually in widget settings. A launch can match more than one follow but should still appear once in lists.

In signed-out iPhone device mode, you can turn on one push reminder 10 minutes before eligible countdown-ready launches on that phone. Premium adds account-backed quiet hours, custom reminder times, follow-based rules, launch-change alerts, and broader controls. On the web, push alerts require Premium on supported browsers. Delivery is best effort.

Yes. Premium notification settings support quiet hours with local start/end times. Dispatch pipelines honor those settings when scheduling sends.

On iPhone or iPad, this device gets one push reminder 10 minutes before eligible countdown-ready launches without Premium. You cannot choose specific launches or custom T-minus times. Premium adds per-launch controls, custom reminder times, follow-based alerts, launch-change alerts, and quiet hours.

On iPhone or iPad, allow notifications in iOS Settings, then open Alerts and turn launch alerts on. Without Premium, you get T-10 reminders for eligible countdown-ready launches on this device, without individual-launch or custom-time controls. Premium adds device controls, launch-change alerts, and quiet hours.

Open Alerts → Android alerts health. Check the app notification permission and each alert channel. Launch reminders, time and status changes, liftoff and results, and followed launch updates (sky alerts and jellyfish launch alerts) have separate settings; older compatibility messages use the existing compatibility channel, named Other alerts on a new installation. You own each channel’s sound, vibration, and importance. Muting one channel does not revoke app permission. Battery optimization, network conditions, and manufacturer background restrictions can delay delivery. On Samsung, check Battery → Background usage limits for Sleeping and Deep sleeping apps. On Xiaomi, review the app’s Background autostart and Floating notifications. Settings names vary by version. The app reports battery status and opens settings; it does not request a battery exemption. Notifications remain best effort.

Premium users can choose up to three prelaunch reminder times for eligible launch alerts. Use Alert Settings to set the default reminder times for new launch and follow alerts.

Follow-based alerts can cover individual launches or launches matched by followed providers, pads, states, rockets, and launch sites. Status and time-change alerts are Premium behaviors tied to the matching source.

No. Calendar entries and alerts are separate. Adding a calendar feed does not turn on push alerts on this iPhone.

No. Alert delivery is best effort because Apple push delivery, browser limits, network state, and launch data changes can affect timing.

No. The app keeps billing separate from alert consent, so buying Premium does not automatically opt you into push notifications.

Push alerts require Premium on supported browsers. After subscribing, open Account notifications settings, enable push, and register the browser you want to use.

Open Calendar to browse launches by month inside the iOS app or the public web calendar.

Premium users can create recurring calendar feeds for all launches, a preset view, all active follows, or one specific follow source. In the app, manage them from Calendar; on the web, from account integrations. Calendar filters can narrow by date range, provider, region, pad, state, or status.

A following feed updates as your active follows change. A specific-follow feed stays tied to one follow source until you change or remove it.

Yes. Calendar entries use launch timing precision from the current launch data and may change when providers update NET or status.

Premium users can create RSS or Atom links for launch updates from More → RSS feeds in the app or account feed tools on the web. Feeds follow the filters you chose when creating them.

Premium users can create embed tokens for a next-launch card on a website. Manage names, presets, and rotation from More → Website widgets in the app or account embed settings on the web.

On iPhone, tap the profile button on Today; on iPad, open Device in the sidebar. Device settings holds Premium, alerts, follows, widget status, and Launch Tools, which manages Live Activity, Siri and Shortcuts, and AR Trajectory Beta. Calendar feeds live in Calendar, and RSS feeds and website widgets live in More.

iPhone widgets only show launches matched by your follows, or a launch you pick manually in widget settings. If you are not following anything and have not picked a launch, widgets show a follow-to-activate state and Odyssey Arc rests. Follow a launch, provider, vehicle, or site in the app, or set a widget to Manual Launch, to activate them.

Launch Clock is a Premium Home Screen and Lock Screen widget with countdown, status, and launch-day signals. Configure it per widget instance to use Smart, Following, Specific Follow, Next Followed Launch, or Manual Launch modes. All modes except Manual Launch show only launches matched by your follows. Buttons can open the launch, start tracking, follow, refresh, weather, or viewing.

Following Launches lists upcoming missions matched by your follows. If you are not following anything, it asks you to follow a launch to fill the widget. Use row actions to track, unfollow, or manage alerts, and open all from the large widget footer.

This Premium widget surfaces weather and viewing context for your configured launch. It follows the same rules as other widgets: it shows a followed launch or your manual pick, and asks you to follow launches when nothing matches. Action buttons open weather conditions or sky viewing sections on the launch detail page.

Odyssey Arc is a living companion widget for your followed or pinned launches, available on the Lock Screen and in small, medium, and large Home Screen sizes. The companion reacts to countdown phase, schedule changes, and pad weather, and completed missions become stars in its archive. If you are not following anything and have not pinned a mission, the companion rests until you do.

Launch Live Activity is a Premium Lock Screen and Dynamic Island countdown for one eligible launch at a time. StandBy presentation appears where iOS supports it.

With Live countdown enabled in Launch Tools, T-Minus Zero automatically tracks the soonest launch that matches your follow rules starting at T-60. You can also start or stop tracking manually from launch detail, widgets, Siri, or Shortcuts when eligible.

Native iPhone and iPad widgets are part of Premium. If your store purchase is active, open Device settings → Premium & billing and use Restore purchases, then return to the app and reload widgets from Widget status.

Widgets read from the latest launch snapshot in the app. Open the app and pull to refresh on Today, then use the widget refresh action if available.

Try phrases like "Track today's launch in T-Minus Zero," "Track launches I follow in T-Minus Zero," "Start live countdown in T-Minus Zero," or "Open today's launch in T-Minus Zero." See Launch Tools for the full phrase list.

Open the Shortcuts app or Launch Tools → Siri and Shortcuts to find catalog actions for opening launches, starting or stopping countdowns, and opening streams when available.

Track, countdown, and follow-aware Siri actions use Premium features such as Live Activity and follows. Opening Today or a launch page works without Premium.

Launch detail may include NWS and, when available, 45th Weather Squadron context plus cloud, visibility, and viewing notes. Treat this as planning guidance, not a guarantee.

The jellyfish effect is a twilight plume pattern that can appear when exhaust stays sunlit above a darker sky. Timing, clouds, and horizon quality all matter.

Change Watch is Premium coverage for scrubs, status changes, and NET updates, plus change history on launch detail so you can see what shifted without rechecking the whole schedule.

When watch links or streams are available, the app hands off to the provider or publisher. Third-party coverage is listed for convenience; T-Minus Zero does not host streams or endorse providers.

No. The app shows headlines and summaries for discovery, then links to the original publisher for full reading.

Info (Command Deck) and Catalog are reference browsers for pads, vehicles, agencies, and related Launch Library 2 entities. They complement the launch schedule rather than replacing it.

Program hubs group missions, vehicles, and related reference material for major programs. Each hub may include its own FAQ for program-specific questions.

The contracts reference includes its own FAQ on the index and detail pages for sourcing, identifiers, and empty-result behavior.

The schedule uses a shared adaptive refresh cadence across public and Premium schedule/detail surfaces. Refresh timing tightens automatically around active launch windows.

Primary launch schedule and metadata come from Launch Library 2 (The Space Devs). News metadata comes from Spaceflight News API. Weather uses NWS (api.weather.gov) and, when available, 45th Weather Squadron forecasts. Feature-specific views may also use FAA, CelesTrak, NASA, NAVCEN, and SpaceX sources. See /legal/data for the full inventory.

Permission requests appear when you use a feature that needs them, such as AR Pad, local timing, or viewing context. Review native privacy links from Device settings → Help and FAQ at any time.

Sensitive permissions are requested in context when a feature needs them. Declining permission may limit that feature but does not block public schedule browsing.

Supported X, YouTube, and Vimeo embeds use click-to-load by default. You can set a preference to always block third-party embeds from privacy settings.