How to apply to HAX accelerator (SOSV) as a hardware startup in 2026

To apply to HAX accelerator, send the SOSV application with a pitch deck, which SOSV says it cannot review a submission without, per SOSV. HAX backs hardware only, advertises up to $550,000 in pre-seed funding, and runs a six-month residency at its 35,000-square-foot Newark labs, per HAX.

The application HAX reads is not the one a software founder sends. HAX says strong applications typically demonstrate a validated problem, a strong founding team with engineering ability and customer orientation, and a working prototype that serves as a credible hypothesis for solving the customer problem, per HAX. Not one of those three is a growth metric.

That is the trade the program is built around. HAX puts engineering resource and a physical build environment behind you instead of a growth playbook: the program page advertises a six-month residency anchored by a 35,000-square-foot Newark headquarters with Chemistry, Analytics, Electrical Engineering, and Mechatronics labs, per HAX. You are being judged on technical de-risking, so lead with it.

There is also no deadline to miss. HAX invests on a rolling basis and typically admits two to three teams per month rather than operating only through a single annual cohort, per HAX. Apply when the prototype is real, not when a form opens.

How to apply to HAX accelerator in 7 steps

The whole process is a pitch deck, the SOSV form, and a rolling decision.

1. Confirm you are a hardware company. HAX states it invests only in hardware companies, particularly products at the intersection of the physical and digital, with focus areas including climate tech, healthcare, and industrial independence, per HAX. If your product ships as pure software, this is the wrong program.
2. Get a working prototype onto the bench. HAX names a working prototype as one of the three signals strong applications typically show, per HAX. A CAD render is not a prototype.
3. Write the pitch deck before you open the form. SOSV requires a pitch deck as part of the HAX application and says it cannot review a submission without one, per SOSV.
4. Open the deck with the validated problem, not the technology. HAX lists a validated problem among the signals strong applications demonstrate, per HAX. Name the customer, the workaround they run today, and what that workaround costs them.
5. Put engineering evidence on the team slide. HAX looks for a strong founding team with engineering ability and customer orientation, per HAX. Show what the team has built and shipped physically, not the degrees.
6. Map the six months to named technical milestones. The residency runs six months, per HAX. Write which subsystem you will de-risk, which test you will pass, and which spec you will hit inside that window.
7. Submit through SOSV and keep building. HAX invests on a rolling basis and admits two to three teams a month, per HAX, so a submission is not a quarter of waiting.

What the HAX SOSV application is judged on

Technical de-risking is the currency here, and most hardware decks spend their first five slides on the wrong thing.

HAX's stated bar is three items, per HAX: a validated problem, an engineering-capable and customer-oriented founding team, and a working prototype that acts as a credible hypothesis. Build the deck as evidence for those three, in that order.

Write about your prototype the way you would write a test report. Say what works, say what broke, and say what you would de-risk first with a lab behind you. The failure mode is a deck that hides the open technical risk, because that risk is the thing the program exists to retire.

✅ Good: "v3 runs unattended for a full shift on our own bench. The remaining failure is the seal at temperature, and that is the first thing we would take into the Newark lab." States the real condition of the hardware and the open risk.

❌ Bad: "We are building the next-generation platform for industrial automation, with a bottom-up TAM of $40B and a launch planned for Q3." No prototype, no named risk, no customer.

HAX program funding: how the $550,000 and the $250,000 relate

SOSV HAX terms are published in two places that do not obviously agree, and founders model the wrong number.

The program page advertises up to $550,000 in initial pre-seed funding, per HAX. The FAQ describes the first investment as $250,000 through a post-money SAFE with no valuation cap, split into $150,000 in cash and $100,000 in in-kind support paid at 30-day intervals during the program, per HAX.

Budget the $150,000, not the $550,000. That is the cash portion of the published first investment, and the other $100,000 arrives as in-kind support you would otherwise have to buy, per HAX. Ask HAX in writing what moves a company from the first check toward the advertised ceiling before you build a runway plan on the bigger figure.

One structural note on the instrument: an uncapped post-money SAFE sets your dilution at the next priced round rather than at signature, so the ownership cost of the deal is not knowable on the day you sign it.

The HAX hardware accelerator is a residency, not a remote program

The labs are the product, and you cannot use them from your kitchen table.

SOSV formally opened HAX's 35,000-square-foot Newark headquarters in May 2024, equipped with chemical, mechanical, and electrical engineering labs, fabrication tools, machining, 3D printing, and testing capabilities, per SOSV. The current program page lists Chemistry, Analytics, Electrical Engineering, and Mechatronics labs and a six-month residency anchored there, per HAX.

• Newark is the base: the residency and the lab access sit at the Newark headquarters, per HAX. Price the relocation before you apply, not after an offer lands.
• The network is wider than the building: HAX also connects founders with engineering, design, sourcing, and manufacturing support in other global hubs, which first-time hardware founders undervalue most.
• Technical staff come with the space: SOSV describes the program as offering on-site labs, a machine shop, and in-house technical experts, per SOSV.

Do not apply if you cannot move. A hardware accelerator whose differentiator is a machine shop gives you very little over a plain wire transfer if you attend it from another continent.

Choosing a deep tech accelerator over a direct pre-seed round in 2026

Choose on build environment and speed to a de-risked prototype, not on brand.

Generalist venture attention has concentrated hard: AI represented 37% of global venture funding and 17% of venture deals in 2024, both record shares, per CB Insights. A program that pays part of its check in lab access and engineering hours is a different currency from a cash-only pre-seed round, and for a physical product it is usually the scarcer one.

Take the residency if your constraint is equipment and technical validation. Go direct if you already have the bench and your only gap is money, and read the guide to raising a seed round as a hardware startup first. If your buyer is a government or defense customer, defense and dual-use startup funding and the Activate Fellowship application guide cover paths that leave the cap table alone. Biology-first teams should weigh the IndieBio application process, SOSV's other deep tech route.

When this matters for your raise

Hardware timelines slip, and the seed market already prices that in: about 40% of all venture rounds raised by seed-stage companies in 2024 were categorized as bridge rounds, per Carta. A HAX decision does not pause that clock, so run your direct investor process on the same calendar as the application rather than after it. Causo matches you to the investors most likely to fund your stage and sector and drafts the outreach, which keeps that parallel track cheap enough to actually run.

FAQ

How do I apply to the HAX accelerator? Submit the SOSV application for HAX with a pitch deck. SOSV requires the deck as part of the application and says it cannot review a submission without one, per SOSV. HAX invests on a rolling basis and typically admits two to three teams per month, so there is no annual deadline to wait for, per HAX.

What does HAX invest? The HAX program page advertises up to $550,000 in initial pre-seed funding, per HAX. Its FAQ describes the first investment as $250,000 through a post-money SAFE with no valuation cap, split into $150,000 in cash and $100,000 in in-kind support paid at 30-day intervals during the program, per HAX. The equity percentage is not published, so confirm ownership terms with HAX directly.

Where is the HAX program based? Newark, New Jersey. SOSV opened HAX's 35,000-square-foot Newark headquarters in May 2024 with chemical, mechanical, and electrical engineering labs, fabrication tools, machining, 3D printing, and testing capabilities, per SOSV. The program is a six-month residency anchored there, per HAX, and HAX also connects founders with engineering, design, sourcing, and manufacturing support in other global hubs.

Is HAX only for hardware? Yes. HAX states it invests only in hardware companies, particularly products at the intersection of the physical and digital, with focus areas including climate tech, healthcare, and industrial independence, per HAX. A product that ships as pure software is not in scope.

How long is the HAX program? Six months. The program page describes a six-month residency anchored by the Newark headquarters, with Chemistry, Analytics, Electrical Engineering, and Mechatronics labs, per HAX. The in-kind half of the first $250,000 investment is paid at 30-day intervals across that program, per HAX.