Live evaluation
Every line solved in a background isolate. The interface never freezes, even on heavy math.
01 · Draft
You have a question. Start typing.
No setup, no boilerplate. Open it, type your numbers, label your values, drop in a formula. Like scribbling on a notepad — except every line is solved the instant you write it.
Units carry through — 4.5 m * 12 m → 54 m²
Percentages just work — 1200 * 80% → 960
Values stick around — reuse them three lines later, or thirty.
1Income = 32003,200
2Rent = 11501,150
3Food = 480480
4Left: Income - Rent - Food1,570
5Saved: @4 * 40%628
02 · Solve
When arithmetic isn't enough, go deeper.
The language grows with the question. Functions, classes, loops, matrices, statistics, symbolic algebra — all solved live, all in the same document. No imports, no environment, no debugging cycle.
Functions & classes — bundle logic that reads like your thinking.
Symbolic algebra — solve, simplify, factor, derivatives, integrals.
Statistics & matrices — mean, std, det, inv, built in.
1class Investment(p, rate, yrs):
2 def value():
3 return p * (1+rate)^yrs
4
5x = Investment(10000, .07, 10)
6x.value()19,671.51
7solve(x^2 - 5x + 6 = 0, x)2, 3
03 · Form
Give your solution a face.
You've solved it. Add a header and the document turns into an interactive form — labeled inputs, chip selectors for fixed choices, read-only outputs. One toggle from editor to form. The person filling it in never sees the math.
Text inputs with live recalculation.
Chip selectors for options like strategy or tax rate.
Protected outputs — nothing to break.
Print & PDF — two-column export, ready to send.
⬡ capital-gains.dplylib
Investment Check
Returns and taxes on a capital investment.
Amount (€)
100,000
Strategy
ConservativeBalancedAggressive
Tax
NoneCapital gains 26.375%
Future value (€)196,715.14
Gross gain (€)96,715.14
Net gain (€)71,206.52
04 · Hand off
Bundle it. Send one file.
A .dplybundle packs your document and its libraries into a single file. Whoever opens it sees the form, fills in their own numbers, gets their own answer. If they're curious, the plain text is right there — read it, change it, make it theirs.
One file, everything inside — document + libraries together.
Plain text underneath — open, inspect, adapt, improve.
No server, no account — email, drive, USB, whatever.
investment-check.dply
capital-gains.dplylib
A
B
C
D
They open it, change their numbers, get their answers.