Here are the top ballet‑flat options with real arch support (or that work very well with slim orthotic inserts), plus short notes on who each is best for and quick shopping tips.

Top picks

• Vionic — Orinda / Orinda Skimmer: built with Vio‑Motion biomechanical footbeds, removable microfiber‑wrapped EVA insoles and a supportive heel cup; podiatrist‑recommended and APMA‑recognized. Best overall for true built‑in arch support and everyday wear. (purewow.com)
• M.Gemi — The Danza (and similar Danza styles): uses a hidden interior wedge/footbed that gives a little lift and arch support while keeping a classic ballet look. Good if you want support without looking orthotic. (businessinsider.com)
• Rothy’s — The Flat (and The Pointe): very comfortable, washable knit flats made from recycled material; lightweight but minimal built‑in arch support—works well if you plan to use a thin 3/4 insole. Best for eco‑minded shoppers who want to add an insert. (purewow.com)
• Dr. Scholl’s — Giorgie Memory Foam Flat: inexpensive option with memory‑foam footbed and heel cushioning that many reviewers find supportive for long days. Good budget pick. (purewow.com)
• Söfft — Kenni (and other Söfft flats): leather‑lined footbed with high‑rebound foam and modest arch support built into the shoe; comfortable all‑day option in a classic style. (purewow.com)
• Margaux — The Demi (and similar Demi styles): not a high orthotic arch, but includes plush foam cushioning and firmer sole construction that feels more supportive than typical flimsy flats—good if you want comfort + style. (purewow.com)

If you need stronger arch support (plantar fasciitis, high arches, lots of standing/walking)

• Use slim/low‑profile orthotic inserts made for dress shoes (3/4 or thin full‑length). Superfeet Casual/Easyfit and Superfeet High‑Heel or PowerStep SlenderFit / Pinnacle Dress are designed to fit narrower, low‑volume shoes and add real arch support without crowding the toebox. These are commonly recommended for flats that lack built‑in support. (superfeet.com)

Quick buying checklist (what to look for)

• Removable footbed or room to drop in a 3/4 insole — easiest way to add real support. (footgear.com.au)
• Firm heel cup and defined arch shape (not just memory foam) for stability. Vionic and PowerStep designs highlight this. (purewow.com)
• Try them on with the socks/hosiery you’ll wear (some run small/large); check return/try‑on policy. (Many of the brands above offer easy returns.) (purewow.com)
• If you have wide feet or bunions, favor brands with width options or a roomier toe box (Rothy’s, Margaux, some Vionic styles). (purewow.com)

Short recommendation based on needs

• Want built‑in, podiatrist‑style support: start with Vionic (Orinda). (purewow.com)
• Want a stylish flat with hidden lift: consider M.Gemi Danza. (mgemi.com)
• Want an eco, washable flat you can customize: Rothy’s + Superfeet Easyfit or PowerStep SlenderFit. (purewow.com)
• On a tight budget: try Dr. Scholl’s Giorgie (then add an inexpensive 3/4 insole if needed). (purewow.com)

If you want, I can:

• Narrow this to styles under a particular price, or
• Find the best current sales/retailers for one or two of these models (I’ll check stock and prices).