TL;DR: If you are replacing spotLESS Materials, the closest options are Boost Biomes, ThereCraft, Passenger AI. 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 spotLESS Materials (YC Summer 2019).
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The three closest alternatives to spotLESS Materials are:
| Alternative | What it does | Stage | Team | Status |
|---|---|---|---|---|
| Boost Biomes | — | YC Summer 2019 | 12 | Inactive |
| ThereCraft | — | YC Summer 2017 | 1 | Active |
| Passenger AI | Software for robotaxi operations. | YC Summer 2018 | 5 | Inactive |
| Dipole Labs | AI-controlled optical switching for AI clusters | YC Summer 2026 | — | Active |
| Atum Works | Gigascale Nanomanufacturing | YC Spring 2025 | 3 | Active |
| EPIC AEROSPACE | Last-mile delivery for satellites. | YC Summer 2019 | 14 | Active |
| Inversion Space | Turning space into a transportation layer for Earth | YC Summer 2021 | 28 | Active |
| 83 Sciences | AI-native materials discovery powered by unpublished experimental data | YC Summer 2026 | 3 | Active |
| Farcast | We build advanced satcom user terminals | YC Winter 2020 | 12 | Active |
| Taobotics | Autonomous robots for retails. | YC Winter 2019 | 11 | Active |
| Hermes Robotics | Autonomous street sweeping as a service by retro-fitting vehicles | YC Winter 2021 | 5 | Active |
| Nimbus | Tesla for city dwellers | YC Winter 2020 | 5 | Inactive |
It depends on your size. Boost Biomes is the closest match on what spotLESS Materials 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.
spotLESS Materials 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 spotLESS Materials 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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