TL;DR: If you are replacing Oklo, the closest options are Apollo Atomics, Inc., 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 Oklo (YC Summer 2014).
Last verified:
The three closest alternatives to Oklo are:
| Alternative | What it does | Stage | Team | Status |
|---|---|---|---|---|
| Apollo Atomics, Inc. | We make the most compact nuclear reactors | YC Spring 2026 | — | Active |
| Boost Biomes | — | YC Summer 2019 | 12 | Inactive |
| ThereCraft | — | YC Summer 2017 | 1 | Active |
| Talos | Predictive maintenance for power infrastructure. | YC Fall 2026 | 3 | Active |
| Helion Energy | Building the world's first fusion power plant | YC Summer 2014 | 150 | Active |
| Posh | Rapidly deployable energy solutions for modern commercial and… | YC Winter 2022 | 10 | Active |
| Enode | Energy Orchestration Platform | YC Winter 2021 | 70 | Active |
| Reach | Long range, wireless energy distribution that scales | YC Summer 2015 | 45 | Active |
| Farcast | We build advanced satcom user terminals | YC Winter 2020 | 12 | Active |
| Phykos | Growing seaweed to stabilize the climate. | YC Summer 2021 | 2 | Active |
| Fleetzero | Making all ships robots. | YC Winter 2022 | 40 | Active |
| Genecis Bio | Makes guilt-free plastics from food waste | YC Winter 2020 | 30 | Active |
It depends on your size. Apollo Atomics, Inc. is the closest match on what Oklo 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.
Oklo is a public company. Expect enterprise pricing and procurement, which is why smaller teams look at the alternatives above.
Every company here is Y Combinator-backed and was matched to Oklo 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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