TL;DR: If you are replacing Seaflight Technologies, the closest options are Heart Aerospace, Boost Biomes, General Astronautics. The table below compares 12 alternatives on what they do, stage, size and status.
Every alternative below is compared on what it actually does, not just its category — so you can see which one genuinely replaces Seaflight Technologies (YC Summer 2022).
Last verified:
The three closest alternatives to Seaflight Technologies are:
| Alternative | What it does | Stage | Team | Status |
|---|---|---|---|---|
| Heart Aerospace | Heart makes electric airplanes with an all-electric range of 250 miles | YC Winter 2019 | 50 | Active |
| Boost Biomes | — | YC Summer 2019 | 12 | Inactive |
| General Astronautics | Robotics for Space R&D | YC Winter 2026 | 2 | Active |
| Enhanced Radar | AI for air traffic control | YC Winter 2025 | 2 | Active |
| ThereCraft | — | YC Summer 2017 | 1 | Active |
| Talyn Air | Long range, battery electric vertical take-off and landing aircraft. | YC Winter 2020 | 18 | Acquired |
| Inversion Space | Turning space into a transportation layer for Earth | YC Summer 2021 | 28 | Active |
| General Aviation | Fix ATC by connecting aircraft to the internet | YC Spring 2026 | — | Active |
| Skyways | Creating a new form of air transportation to advance our civilization | YC Summer 2017 | 33 | Active |
| Efference | — | YC Fall 2025 | 12 | Active |
| 6thSense | Nervous System for Physical AI | YC Summer 2026 | 4 | Active |
| Arc | aerial videography | YC Summer 2012 | 2 | Inactive |
It depends on your size. Heart Aerospace is the closest match on what Seaflight Technologies actually does. If you need something more established, sort the table by team size — larger teams generally mean more support and a longer track record. If budget is the constraint, the earlier-batch companies are usually the ones still competing on price.
Seaflight Technologies is still operating, so switching is a choice rather than a forced migration. Compare on fit and price rather than urgency.
Every company here is Y Combinator-backed and was matched to Seaflight Technologies on what it actually does — its own description of its product — rather than on a broad category label. Batch, team size and operating status come from the YC directory and are shown as-is. We do not rank by payment.
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