TL;DR: If you are replacing H3X Technologies, the closest options are Heart Aerospace, Boost Biomes, ThereCraft. 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 H3X Technologies (YC Winter 2021).
Last verified:
The three closest alternatives to H3X 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 |
| ThereCraft | — | YC Summer 2017 | 1 | Active |
| General Aviation | Fix ATC by connecting aircraft to the internet | YC Spring 2026 | — | Active |
| Fleetzero | Making all ships robots. | YC Winter 2022 | 40 | Active |
| Farcast | We build advanced satcom user terminals | YC Winter 2020 | 12 | Active |
| Nimbus | Tesla for city dwellers | YC Winter 2020 | 5 | Inactive |
| General Astronautics | Robotics for Space R&D | YC Winter 2026 | 2 | Active |
| Forerunner AI | AI that gets aircraft flying faster | YC Fall 2024 | 2 | Active |
| Ares Industries | Building low-cost cruise missiles | YC Summer 2024 | 2 | Active |
| Prime Lightworks | Prime Lightworks Inc. manufactures electric propulsion systems for… | YC Summer 2016 | 1 | Active |
| Passerine Aircraft | Passerine Aircraft is building the next generation of dronesWe are… | YC Summer 2017 | 2 | Inactive |
It depends on your size. Heart Aerospace is the closest match on what H3X 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.
H3X 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 H3X 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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