Pro is the app doing the lookup.
€9.99, once.
If you type it or pick it, it's free. If the app looks up a table or walks the sizes for you, it's Pro. One purchase, restored by the store, no account of ours, no subscription.
No web purchase: Pro is bought in the app through the store, so it restores on a new phone without an account.
Free is a real job. Pro is the app doing the lookup.
| Free | Pro · €9.99 once | |
|---|---|---|
| Voltage drop | Typed cross-section, custom limit, one "size up" on a FAIL, solve for max length | Find the smallest size automatically, AC and DC |
| Ampacity | Your own Iz from the book, checked against the load | Bundled tables; ambient, grouping and insulation factors; Iz bookmarks |
| Cable size | Inputs live, number locked | Two gates — Iz after factors and voltage drop — with the rejected sizes and why |
| National packs | All five | All five |
| Pipe size & loss | Required diameter and the velocity in your pipe | Catalogue pick; pressure loss with fittings |
| Heat loss | With your U-values | Construction presets and a radiator pick |
| History & share | Last 5 · share as text | Last 50 · PDF with the working · CSV export |
If you type it or pick it, it's free. If the app looks up a table or walks the sizes for you, it's Pro — €9.99, once.
When the unlock sheet appears
Exactly three moments: when you tap "Find smallest CSA" or the next size from a catalogue; when a result needs a bundled table or preset; when you tap the history banner after the fifth saved job. Never when you pick a pack, never when you open a screen.
Restore, family, refunds
Restore purchases works with no account of ours; after a restore the app is Pro in airplane mode too. Family Sharing on iOS. A refund goes through the store and the app simply returns to free.
What never changes
One price, one unlock, no tiers, no trial, no subscription, no account. Future table updates in this major version are included.