TL;DR: If you are replacing Phoenix Hydrogen, the closest options are Boost Biomes, ThereCraft, Apollo Atomics, Inc.. 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 Phoenix Hydrogen (YC Winter 2022).
Last verified:
The three closest alternatives to Phoenix Hydrogen are:
| Alternative | What it does | Stage | Team | Status |
|---|---|---|---|---|
| Boost Biomes | — | YC Summer 2019 | 12 | Inactive |
| ThereCraft | — | YC Summer 2017 | 1 | Active |
| Apollo Atomics, Inc. | We make the most compact nuclear reactors | YC Spring 2026 | — | Active |
| Posh | Rapidly deployable energy solutions for modern commercial and… | YC Winter 2022 | 10 | Active |
| Rewbi | A stealth mode startup. | YC Summer 2024 | 3 | Active |
| Enode | Energy Orchestration Platform | YC Winter 2021 | 70 | Active |
| Phykos | Growing seaweed to stabilize the climate. | YC Summer 2021 | 2 | Active |
| Genecis Bio | Makes guilt-free plastics from food waste | YC Winter 2020 | 30 | Active |
| Kapacity.io | Reducing energy costs & emissions in buildings. | YC Summer 2021 | 7 | Acquired |
| Meteoric | Drones that clear clouds over solar farms and weaken hurricanes | YC Summer 2026 | 2 | Active |
| inBalance | Electricity price forecasts for energy storage, ev charging, etc. | YC Winter 2021 | 10 | Acquired |
| PowerX | AI powered sensors that save energy, water and emissions | YC Winter 2020 | 20 | Acquired |
It depends on your size. Boost Biomes is the closest match on what Phoenix Hydrogen 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.
Phoenix Hydrogen is no longer listed as active, so anyone still relying on it should plan a migration to one of the alternatives above.
Every company here is Y Combinator-backed and was matched to Phoenix Hydrogen 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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