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Solid Foundation Software

Good
ideas.
Built
right.

We turn everyday challenges into thoughtfully built apps. Useful tools, clear design, and the details that make software feel right.

Explore our apps Meet the studio
iPhone
iPad
Mac
Apple TV
Apple Watch

PoshPromo · Listing design

PoshPromo

Give your next sale
a look of its own.

Create a consistent look across your Poshmark listings. Choose a promo, customize the design, and preview every cover before you apply it. When the sale ends, restore your originals.

Explore PoshPromo Get the app
PoshPromo home screen with active sale promos, listing previews, and a sale reminder.

  • A consistent look

    Bring your listings together with branded promo covers.

  • Less repetition

    Apply a campaign across selected listings in one go.

  • Preview first

    See the changes before they reach your closet.

  • Keep your originals

    Restore your covers when the campaign is over.

PoshRelist · A fresh start

PoshRelist

Refresh your closet.
Renew your sales.

Your next sale could already be in your closet. Find stale Poshmark listings, review your prices, and give your pieces a fresh start with a guided relisting routine.

Explore PoshRelist Coming to iPhone
PoshRelist dashboard showing eligible listings, sales from relisted items, and daily relisting progress.

  • Find stale listings

    See which pieces are ready for another look.

  • Review your prices

    Adjust your price before you relist.

  • Less repetition

    Work through each relist with a guided workflow.

  • See your progress

    Build a routine that keeps your closet moving.

Seller Insight · Sales & inventory

Seller Insight

See what’s working.
Know what’s next.

Bring your Poshmark sales and inventory into focus. Follow revenue and earnings, find your strongest performers, and see where your closet needs attention.

Explore Seller Insight Get the app
Seller Insight live sales screen showing sold items, daily revenue, and weekly sales charts.

  • Follow your sales

    See revenue and net earnings together.

  • Find your strengths

    Discover the brands, categories, and sizes that perform.

  • Understand your inventory

    See what’s moving and what’s sitting.

  • Plan your next move

    Put your own sales history to work.

Made for Apple

Different screens. The same care.

A studio making meticulously engineered apps for iPhone, iPad, Mac, Apple TV, and Apple Watch — the kind you set up once and quietly rely on for years.

iPhone

Close at hand.

iPad

Room to explore.

Mac

Space to focus.

Apple TV

A bigger view.

Apple Watch

A quick glance.

What would you like to build?

Tell us about the idea, the problem, or the thing you wish worked better.

Let’s talk sfs@solidfoundationsoftware.com