Who competes with Heimdal?

Heimdal competes in the Industrials category against Phykos, Boost Biomes, ThereCraft, AirMyne, Noya and other Y Combinator-backed companies.

Heimdal alternatives: 12 options compared

Q: What are the best alternatives to Heimdal?

The closest alternatives to Heimdal are Phykos, Boost Biomes, ThereCraft. This page compares 12 alternatives on what each one does, funding stage, team size and operating status.

Q: Which Heimdal alternative should I choose?

Phykos is the closest match to what Heimdal does. Larger teams in the comparison table generally offer more support and a longer track record, while earlier-stage companies tend to compete on price.

Q: Is Heimdal still active?

Heimdal is currently listed as Inactive in the Y Combinator directory.

TL;DR: If you are replacing Heimdal, the closest options are Phykos, 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 Heimdal (YC Summer 2021).

Last verified: 2026-06-01

What are the best alternatives to Heimdal?

The three closest alternatives to Heimdal are:

Phykos — Growing seaweed to stabilize the climate. (YC Summer 2021).
Boost Biomes — works in the same Industrials category (YC Summer 2019).
ThereCraft — works in the same Industrials category (YC Summer 2017).

Heimdal alternatives compared

Alternative	What it does	Stage	Team	Status
Phykos	Growing seaweed to stabilize the climate.	YC Summer 2021	2	Active
Boost Biomes	—	YC Summer 2019	12	Inactive
ThereCraft	—	YC Summer 2017	1	Active
AirMyne	Building systems to remove carbon dioxide from air at industrial scale	YC Winter 2022	11	Active
Noya	Radically reducing capital costs and build time for direct air capture	YC Winter 2021	7	Inactive
SINAI	Enterprise software to quantify cost-effective decarbonization…	YC Winter 2020	50	Active
Carbonfact	Decarbonizing the fashion industry	YC Summer 2021	22	Active
Seabound	Carbon capture equipment for ships	YC Winter 2022	18	Active
ALT TEX	Biodegradable and carbon neutral textiles, engineered from food waste.	YC Summer 2022	10	Active
Ares Industries	Building low-cost cruise missiles	YC Summer 2024	2	Active
Helion Energy	Building the world's first fusion power plant	YC Summer 2014	150	Active
Releaf Earth	Turning food waste into Biochar to remove CO2 from the atmsophere	YC Summer 2017	100	Active

Which Heimdal alternative should I choose?

It depends on your size. Phykos is the closest match on what Heimdal 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.

Is Heimdal still active?

Heimdal is no longer listed as active, so anyone still relying on it should plan a migration to one of the alternatives above.

How was this list put together?

Every company here is Y Combinator-backed and was matched to Heimdal 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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