Find pre-seed, stealth, or early startups

Mindstate Design Labs is described as an early-stage company and is part of Y Combinator's S21 batch, which typically includes early-stage startups.

Xfers is an early-stage startup as indicated by its status and stage information. However, it is not in the pre-seed stage or in stealth mode.

Diffuse Bio is an early-stage startup as indicated by its stage being explicitly mentioned as 'Early' and its participation in the Y-Combinator W23 batch, which typically includes early-stage companies.

Unusual Ventures offers a pre-seed program called Spark, providing up to $2M in funding for early-stage product builders, and supports software startups from idea to IPO, indicating involvement with pre-seed and early-stage startups.

Roforco is in the early stage as indicated by its participation in YCombinator's S22 batch and securing $1.5 million in seed funding. There is no specific evidence that it is in pre-seed or stealth mode.

Massive is named one of the Top 100 Early Stage Companies to Work for in 2022, indicating it is an early-stage startup.

Piggy is described as being in the early stage of business, which matches one of the criteria in the query.

Marathon Education is an early-stage startup as it recently raised over $1.5 million in funding, is part of the Y Combinator W22 batch, and employs a team of 20. However, there is no specific evidence that it is in the pre-seed stage or in stealth mode.

Rownd is in the pre-seed stage as evidenced by their $1M pre-seed round and participation in Y Combinator's Winter '22 batch. There is no specific evidence that they are in stealth mode, but they are an early-stage startup given their recent funding and small team size.