# Planned Experiment — Design of Experiments tool

> Design of Experiments tool (iPhone/iPad app by Ilya Obraztsov.)

- Source: https://appshunter.io/ios/app/planned-experiment/id6804523091 (this page in markdown: same URL + `.md`)
- Developer: [Ilya Obraztsov](https://appshunter.io/developer/1499085877)
- Category: Productivity, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 7 MB
- Languages: American English
- Released: 2026-09-13
- Data updated: 2026-10-07
- User reviews in markdown: https://appshunter.io/ios/app/planned-experiment/id6804523091/reviews.md

## What is Planned Experiment?

PlanExp is a complete environment for design of experiments, ordinary-least-squares regression, and response-surface work — from the planning matrix to 2D contours, 3D surfaces, and ternary diagrams.

Build a plan, enter replicate measurements, fit a polynomial model, test it, and read the optimum inside the coded cube [−1, +1]^k. Factor coding follows the classical DOE convention x = (X − X0) / ΔX.

WHAT YOU CAN DO
• Choose a design: one-factor grid, 2^k and 2^(k−p), Box–Draper B-D13, rotatable / face-centered / inscribed CCD, Box–Behnken, Plackett–Burman, Doehlert, 3^k, Taguchi arrays, simplex lattice for mixtures, D-optimal, Latin hypercube, and definitive screening.
• Fit OLS models with main effects, two-factor interactions, and quadratic terms. Optional three-way interactions for 2^k.
• Run Cochran’s C for variance homogeneity, Student’s t on coefficients, and Fisher’s F for lack of fit. See R², adjusted R², and RMSE.
• Drop insignificant terms and refit. Canonical analysis locates the stationary point; a constrained search reports the best feasible point in the experimental region.
• Plot response curves, filled contours, interactive 3D surfaces, and ternary (mixture) diagrams in natural units.

FREE AND FULL
The free version includes a one-factor grid, full factorial 2^k with up to three factors, two parallel runs, PDF reports, and JSON of your own project. Local gallery save is always free.
The full version unlocks every design (including a custom matrix), up to 12 parallel runs, and CSV export — a single lifetime purchase.

WHO IT IS FOR
Researchers, process engineers, chemists, metallurgists, and students who plan laboratory or plant trials and need transparent classical statistics rather than a black-box optimizer.

PlanExp continues the lineage of the PlanExp 2³ and PlanExp B-D13 desktop tools, rewritten for iPhone, iPad, and Mac with a shared math core.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full version | $17.99 | one-time |



## Version history (last 3 releases)

### 1.0.2 — 2026-09-22

Math typography across the app: matrix headers, coefficient names, criterion hints. Stability fixes.

### 1.0.1 — 2026-09-21

Real math typography: model equations and statistics now use true subscripts and superscripts (x₁, x₁², SSₜₒₜ).

### 1.0 — 2026-09-14

No release notes.

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## More apps by Ilya Obraztsov

- [Granumetric](https://appshunter.io/ios/app/granumetric/id6808337887)

All apps by Ilya Obraztsov: https://appshunter.io/developer/1499085877

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-07.*