TL;DR: If you are replacing Seabound, the closest options are Boost Biomes, Phykos, 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 Seabound (YC Winter 2022).
Last verified:
The three closest alternatives to Seabound are:
| Alternative | What it does | Stage | Team | Status |
|---|---|---|---|---|
| Boost Biomes | — | YC Summer 2019 | 12 | Inactive |
| Phykos | Growing seaweed to stabilize the climate. | YC Summer 2021 | 2 | Active |
| ThereCraft | — | YC Summer 2017 | 1 | Active |
| Releaf Earth | Turning food waste into Biochar to remove CO2 from the atmsophere | YC Summer 2017 | 100 | Active |
| Remora | Carbon capture for vehicles | YC Winter 2021 | 45 | Active |
| Noya | Radically reducing capital costs and build time for direct air capture | YC Winter 2021 | 7 | Inactive |
| Dipole Labs | AI-controlled optical switching for AI clusters | YC Summer 2026 | — | Active |
| Inversion Space | Turning space into a transportation layer for Earth | YC Summer 2021 | 28 | Active |
| Carbon Crusher | We make carbon negative roads | YC Winter 2022 | 21 | Active |
| AirMyne | Building systems to remove carbon dioxide from air at industrial scale | YC Winter 2022 | 11 | Active |
| Helion Energy | Building the world's first fusion power plant | YC Summer 2014 | 150 | Active |
| SINAI | Enterprise software to quantify cost-effective decarbonization… | YC Winter 2020 | 50 | Active |
It depends on your size. Boost Biomes is the closest match on what Seabound 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.
Seabound 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 Seabound 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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