Comparison

Airtime BT vs Groundrush Skydiving

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

Head to head
About

Airtime BT

Features
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Download your tracks directly from your Flysight 2 via Bluetooth and check your performances on your phone between two jumps! Also compatible with Flysight 1 (requires standard iPhone adapter, see documentation). Remember to update your Flysight 2 to the latest official firmware to enable Bluetooth support. See instructions here: https://flysight.ca/firmware/ Please check the documentation and report bugs here: https://github.com/vef445/AirtimeBT/blob/master/README.md

About

Groundrush Skydiving

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Groundrush is the free phone companion for the FlySight 2 GPS logger. Set up your ENGO 3 heads-up display, pull a jump off the logger over Bluetooth and look at it — standing in the packing area, between jumps. WHAT IT DOES • ENGO 3 HUD setup — choose what the glasses show and where, how often they refresh, and bind the FlySight to your own pair of glasses. The logger drives the display directly; the phone is not part of the link in flight. • Track download — pull recorded jumps off the FlySight 2 over Bluetooth. • Track library — import .csv and .gpx files, browse them by day, export and share. The library lives on your phone and works offline. • Jump analysis — exit altitude, freefall time, speeds and glide ratio, with automatic detection of the flown segment, and charts you can read at any instant of the jump. • Map View — the route drawn over a satellite or road map, coloured by speed, with exit and landing marked. • Winds aloft — wind by altitude, so the charts can also show what you flew with the wind taken out. • Firmware updates over the air for the ENGO HUD firmware. GROUNDRUSH CLOUD (OPTIONAL) • Sign in with Apple or Google. There is no Groundrush password. • Upload a track and it is kept privately in the cloud; open it in a browser at groundrush.io. • Make a jump public when you want to share it. A public page shows your username and photo, wingsuit, dropzone, the date and time, the shape of the path, the wind and the charts — never the GPS coordinates or the original file. • Auto Upload — when it is on, every detected jump goes to the cloud right after the download from the FlySight. • Wingsuit and dropzone on each track, picked from shared lists. • Delete your account from the app at any time. WHAT IT DOES NOT DO The app works fully without an account. No advertising. No analytics, and no tracking of any kind. Without an account your tracks are files on your phone and nothing is uploaded. What does leave the device: a jump's coordinates and date, sent to a public weather service to look up the wind; map imagery requested from Google when you open a map; and a firmware check with GitHub. With an account, the app also sends to Groundrush's own servers the track files you upload, the profile you enter and the photo you choose. All of it is described in full in the privacy policy. Groundrush is free. Everything listed above stays free. NOT AFFILIATED Groundrush is an independent project. It is not made by, endorsed by or affiliated with FlySight or ActiveLook. Privacy policy: https://groundrush.io/privacy Contact: hello@groundrush.io

Screenshots

Airtime BT4 screens
Groundrush Skydiving3 screens

Verdict

The call

Airtime BT and Groundrush Skydiving are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Airtime BT ships an update every 3 days, Groundrush Skydiving every 4 days. The most recent releases landed on October 25, 2026 and October 29, 2026 respectively.

ScorecardNo meaningful differences
Airtime BT versus Groundrush Skydiving: the parameters behind the verdict, then further details
ParameterAirtime BTGroundrush Skydiving
PriceFreeFree
Update frequencyEvery 3 days — betterEvery 4 days
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.615.0 — better
Further details — not scored
Size3 MB39 MB
Age rating4+4+
DeveloperGuillaume Gerard Frantz VigneronAleksandr Boikov

In-app purchases

None

Airtime BT

No in-app purchases

None

Groundrush Skydiving

No in-app purchases

Questions

Is Airtime BT free?
Airtime BT is free to download, with no in-app purchases.
Is Groundrush Skydiving free?
Groundrush Skydiving is free to download, with no in-app purchases.
Do Airtime BT or Groundrush Skydiving have ads?
Neither Airtime BT nor Groundrush Skydiving shows ads.
Which is updated more often, Airtime BT or Groundrush Skydiving?
Airtime BT ships an update every 3 days, and Groundrush Skydiving every 4 days. Most recently, Airtime BT was updated on October 25, 2026 and Groundrush Skydiving on October 29, 2026.

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