TL;DR: If you are replacing Theseus, the closest options are ThereCraft, Maquoketa Research, Arc. 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 Theseus (YC Summer 2024).
Last verified:
The three closest alternatives to Theseus are:
| Alternative | What it does | Stage | Team | Status |
|---|---|---|---|---|
| ThereCraft | — | YC Summer 2017 | 1 | Active |
| Maquoketa Research | The intelligence layer for drones | YC Spring 2026 | 5 | Active |
| Arc | aerial videography | YC Summer 2012 | 2 | Inactive |
| Boost Biomes | — | YC Summer 2019 | 12 | Inactive |
| Efference | — | YC Fall 2025 | 12 | Active |
| Passenger AI | Software for robotaxi operations. | YC Summer 2018 | 5 | Inactive |
| 6thSense | Nervous System for Physical AI | YC Summer 2026 | 4 | Active |
| General Instinct | Inference Infrastructure for Physical AI | YC Spring 2026 | 2 | Active |
| IMPACT Drones | Air Defense as a Service for Civilian Infrastructure. | YC Summer 2026 | 2 | Active |
| StableBrowse | Building the Data Infrastructure layer for Physical AI. | YC Spring 2026 | 3 | Active |
| Iron Grid | Foundational models for risk and quality. | YC Summer 2025 | 2 | Active |
| Null Labs | End-to-end Simulation for Defense Autonomy | YC Fall 2025 | 2 | Active |
It depends on your size. ThereCraft is the closest match on what Theseus 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.
Theseus 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 Theseus 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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