REFPROP-grade physics, without the $325 price tag or the install
REFPROP is the reference everyone — including Evodelta — measures against. It is also a property library: you still have to build the cycle model, the unit handling and the report yourself. Evodelta wraps the same CoolProp property engine that exposes REFPROP-class physics into a working refrigeration cycle workspace.
Verified state — NIST REFPROP 10
The reference-grade thermophysical property database and DLL — the standard other tools are validated against. It is a property library, not a cycle-design application.
Current release is REFPROP 10: $325 for a single-user download, $125 to upgrade from a previous version, site licences available. NIST's own page warns: “There will be a price increase when v10.1 is released in October 2026.”
Side by side
Competitor column reflects the vendor's own published facts as verified on 2026-10-06.
| Aspect | NIST REFPROP 10 | Evodelta |
|---|---|---|
| What it is | Thermophysical property database + DLL — a library, not an application | A cycle-design application with the property engine already wired in |
| Physics | Reference-quality Helmholtz EoS — the benchmark | CoolProp Helmholtz equations of state — the same reference lineage as REFPROP, no proprietary look-up tables |
| Cycle workflow | None out of the box — you build the cycle, charts and reports | Guided cycle forms, interactive P-h diagram, pipe sizing, cascade systems, A2L charge-limit and minimum-room-area checks |
| Install / friction | Windows/API orientation, download + licence friction | Nothing to install — runs in the browser on Windows, macOS, Linux, Chromebook, iPad and phone |
| Price | $325 single user; rising with v10.1 (October 2026) | Free tier, no card. Solo $49/month — $0 to start |
| Teams | Site licences and volume discounts; licensing takes negotiation | Per user, cancel anytime. No per-seat ladder, no install fee, no 'no refund after installation' |
| Verification | Reference standard, validated by definition | Reproducible worked example + published method on /verification |
If you are switching
Honest migration path — including what does not transfer.
- 1.Keep REFPROP for the cases that need a certified reference property call — nothing here replaces a licensed reference database for formal submissions.
- 2.Use Evodelta for the cycle-level work: state points, P-h diagram, pipe sizing, glide handling, charge limits, and reports you can share as links. That is the part REFPROP never shipped.
- 3.Cross-check your headline COP: the /verification page publishes a worked example you can re-derive point by point.
REFPROP's physics are not in question; its price, licensing friction and missing cycle workflow are. Evodelta is CoolProp-verified — the same reference-EOS lineage — in a browser tab, and the year REFPROP goes up in price is the year that gap is widest.
Every figure on this page is traceable to the vendor's own published documentation. Where a vendor publishes no number, this page says so rather than estimating.