GravidiaSign in

Know when to make more, and whether you can.

Gravidia is production planning and inventory forecasting for small-batch manufacturers. It works backward from the day you'll run out — through your production lead time — to the day you need to order materials.

Join the waitlist

In private development. Launching to a small first group.

Action Items — what to make, what to order, and by when.
Action Items — what to make, what to order, and by when.

Built for people who make what they sell.

A fit if

  • You manufacture your products rather than reselling them
  • 10 to 80+ SKUs in one coherent product family
  • Raw materials in, batches produced, finished goods held
  • Your own store, plus Amazon, Etsy, or wholesale
  • Roughly $250K to $5M a year
  • One to ten people, and you're still hands-on in operations

Not a fit if

  • You resell products you didn't make
  • Your work is custom one-offs rather than repeatable batches
  • You sell a single SKU
  • You're a service business

You already know the failure modes.

The costing spreadsheet is always one price change out of date.

You find out you're short on a material the morning you planned to run the batch.

You can't say which channel actually makes money after every fee.

How it works

  1. 1

    Connect your store.

    Gravidia reads your products, locations, and inventory, so your counts stay current without anyone retyping them.

    Integrations — connected platforms and where stock counts come from.
    Integrations — connected platforms and where stock counts come from.
  2. 2

    Define how each product is built.

    Materials, work activities, and sub-assemblies, once — costs and requirements flow from there.

    A production recipe with materials, work activities, and sub-assemblies.
    A production recipe with materials, work activities, and sub-assemblies.
  3. 3

    See what to make and what to order.

    Gravidia forecasts depletion against real sales velocity, then works backward through lead times to the date you have to act.

    A forecast working backward from the stockout date to the material order date.
    A forecast working backward from the stockout date to the material order date.
  4. 4

    See what each channel actually earns.

    Per-channel recipes carry platform fees, fulfillment labour, packing materials, and shipping.

    Channel economics — margin per channel after every fee.
    Channel economics — margin per channel after every fee.

Reorder alerts assume you buy the thing.

You make it. That takes lead time, materials on hand, and capacity to run the batch. An inventory tool can tell you a number is getting low. It can't tell you whether you can do anything about it, or when you had to start.

Gravidia plans production backward from demand, with materials and capacity checked along the way. That's the part nothing else in this price range does.

Who's building it

Gravidia is built by Tony Zink in Detroit.

It isn't a demo. Zink Wheels — a real manufacturing business with real materials, real batches, and real multi-channel sales — runs on Gravidia every day. Every feature had to survive contact with an actual production schedule before it shipped.

It's early, and we'd rather say so. There's no customer list to show you yet. What there is: a working product, an operator who uses it, and a deliberate plan to onboard a small first group properly rather than a large one badly.

Pricing

Gravidia will be $99 to $249 a month, depending on SKU count and users.

The first ten customers pay $49 a month, locked for as long as they stay subscribed, in exchange for working closely with us through launch.

No free tier. Built for businesses doing $250K a year and up.

Questions

What is Gravidia?

Gravidia is production planning and inventory forecasting software for small-batch manufacturers. It models how each product is built, forecasts when finished goods will run out based on actual sales velocity, and works backward through production and supplier lead times to tell you when you need to start a batch or order materials.

Who is it for?

Founder-operated manufacturing businesses that produce in batches: roughly 10 to 80+ SKUs in one product family, $250K to $5M in annual revenue, selling through their own store plus channels like Amazon, Etsy, or wholesale. Common examples are candle makers, leather goods makers, specialty food and beverage producers, personal care products, and small assembly shops.

How is it different from an inventory management tool?

Inventory tools track what you have and tell you when to reorder. That assumes you buy your products. Gravidia is built for businesses that make them, so it models multi-level bills of materials, production runs, work activities, and capacity — and plans backward from a projected stockout date through production time to a material order deadline.

What does it connect to?

Shopify today, for products, locations, and inventory levels. Support for additional platforms is in development. Gravidia requests read-only access and never writes to your store.

Does it handle sub-assemblies and multi-level bills of materials?

Yes. A product's recipe can include materials, work activities, and sub-assemblies, and sub-assemblies have recipes of their own. Update a shared component once and every product that uses it reflects the change.

Does it handle multiple locations?

Yes. Inventory is tracked per product per location, including third-party warehouses, and forecasting accounts for where stock actually sits.

Can it tell me which sales channels are profitable?

Yes. Each product has a fulfillment recipe per sales channel covering platform fees, fulfillment labour, packing materials, and shipping, so margin is calculated after every real cost rather than estimated.

When does it launch?

Gravidia is in private development. We're opening it to a small first group rather than launching publicly, and there's no fixed public date. Joining the waitlist is how you hear when that changes.

What will it cost?

$99 to $249 a month depending on SKU count and users, with the first ten customers at $49 a month locked for as long as they stay subscribed. There is no free tier.

Where does my data live?

In a PostgreSQL database hosted on Supabase in the United States. Each business's data is isolated at the database level, and integrations are read-only.

Join the waitlist

We're onboarding a small number of businesses at a time. The questions below aren't filler — they're how we work out who to talk to first.

Your storefront is the fastest way for us to understand what you make.

We'll email you a confirmation. We won't send you a newsletter, and we won't share your address.