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Getcalc
Maker Calc
Epoxy
Resin
Calculate exactly how much epoxy resin you need for river tables, jewelry, or any project. Free, accurate, no sign-up. Built for makers.

Website, pricing, platforms and company facts side by side.
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| Website | opalstack.com | resincalc.app |
| Pricing | ||
| Platforms | — | |
| Company | — | Startup from España · 1 - 9 employees · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Opalstack yet.
ResinCalc is a free, no-sign-up epoxy resin calculator for makers, woodworkers and crafters. Enter your piece's shape, measurements and depth and get exactly what you need to pour with confidence: Exact resin amount in grams (or oz) — never run short or waste expensive resin A:B mixing ratio by...
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Overall verdict
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As answered by people managing Opalstack and ResinCalc.app.
ResinCalc.app's answer:
Makers, woodworkers (hobbyist and professional) and crafters working with epoxy:
Anyone who needs an exact resin amount and doesn't want to guess or waste expensive resin.
ResinCalc.app's answer:
ResinCalc.app's answer:
ResinCalc.app's answer:
Most resin calculators are a single field buried inside a manufacturer's store, and they only output one total weight. ResinCalc is free, independent and ad-free, and it gives you the full picture:
Plus it's bilingual and works on mobile without registration.
ResinCalc.app's answer:
It's the only free epoxy resin calculator that turns a deep pour into a safe, layer-by-layer plan — with the exact grams and timing for each layer — instead of just giving you a single total.
It also handles:
ResinCalc.app's answer:
I kept seeing makers either run short halfway through a pour or waste expensive resin by over-mixing — and the existing calculators only gave a rough total, with nothing for deep pours that have to be done in layers.
I built ResinCalc to fix that: the exact amount, the A:B split and an automatic layer plan — free, no sign-up, in both English and Spanish.
Share your experience with using Opalstack and ResinCalc.app. For example, how are they different and which one is better?