TL;DR: If you are replacing Prometheus, the closest options are Boost Biomes, ThereCraft, Helion Energy. 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 Prometheus (YC Winter 2019).
Last verified:
The three closest alternatives to Prometheus are:
| Alternative | What it does | Stage | Team | Status |
|---|---|---|---|---|
| Boost Biomes | — | YC Summer 2019 | 12 | Inactive |
| ThereCraft | — | YC Summer 2017 | 1 | Active |
| Helion Energy | Building the world's first fusion power plant | YC Summer 2014 | 150 | Active |
| Apollo Atomics, Inc. | We make the most compact nuclear reactors | YC Spring 2026 | — | Active |
| Phykos | Growing seaweed to stabilize the climate. | YC Summer 2021 | 2 | Active |
| Seabound | Carbon capture equipment for ships | YC Winter 2022 | 18 | Active |
| Posh | Rapidly deployable energy solutions for modern commercial and… | YC Winter 2022 | 10 | Active |
| Talos | Predictive maintenance for power infrastructure. | YC Fall 2026 | 3 | 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 |
| Carbonfact | Decarbonizing the fashion industry | YC Summer 2021 | 22 | Active |
| Revoy | Make diesel semi trucks hybrid-electric | YC Winter 2022 | 4 | Active |
It depends on your size. Boost Biomes is the closest match on what Prometheus 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.
Prometheus 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 Prometheus 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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