The whole run in one place: a recipe in percentages or grams, the lye and water worked out, every batch traced by lot, the EU compliance checked, the label printed, and the cost per bar known before you price it.
Work an oil blend as percentages of the batch, or as actual weights — Alchemis keeps both consistent. Change one oil and the rest redistribute; lock the ones you don't want touched. Scale a 500 g test up to a 4 kg run and every weight comes with it.
Enter your oils and a superfat, and Alchemis works out the NaOH for a solid bar or KOH for liquid soap, plus the water — from real saponification (SAP) values. The lye and water then flow straight into your batch cost, so the price already knows about them.
Double-check against a second lye calculator before you mix — lye is caustic and gets hot. Gloves and eye protection, add lye to water (never the reverse), work somewhere ventilated.
Each production run gets a lot number, a make date and a cure window, photos from along the way, and an activity log. Mark it complete and split it into bars — each carrying its lot, so you always know what went into which.
Bar soap sits under IFRA Category 9 and the EU cosmetic rules. As you formulate, Alchemis checks your fragrance load against the Cat 9 limits, flags EU allergens to declare, and watches preservative caps under Annex V. When something's above the limit, it states the actual number and proposes a fix — in amber, never as a violation.
Best-effort guidance to catch issues early, never a certification. Always defer to your own supplier documentation and a qualified assessor.
Saponified oils change name on the label — and Alchemis writes them the right way: saponified-INCI naming, so "olive oil + lye" becomes Sodium Olivate, coconut becomes Sodium Cocoate, alongside Aqua and Glycerin. Allergens are called out, PAO and best-before are printed, lot and dates included.
Oils, lye, fragrance, packaging — every cost rolls up from your supplier prices into a per-bar COGS. Set a margin or a markup and Alchemis suggests the selling price, so you price from the real number instead of a guess.
Lye, compliance, labels, batch tracking and cost per bar — for soap and five other crafts. Free forever for hobbyists.