On their phone

How would you rate a speaker who engages with 75% of the room?

On the big screen

Your audience scans a QR code to participate

Run live A/B experiments in your slides.

Your audience scans a QR code to participate

Split your audience, run the experiment live, and let the room watch its own result land.

Start Free

Works right inside

PowerPoint Google Slides

Start from a real experiment

A library of experiments, ready to run live.

Every A/B activity starts from a library of ready-to-run behavioral experiments — famous studies in framing, anchoring, pricing, and choice architecture, staged for a live audience. Split the room at random, collect votes on their phones, and let the result make your point better than a slide ever could. A few of the presets:

Framing & loss aversion

Surgery survival vs mortality

The identical operation, described two ways — one in survival, one in mortality.

A surgery has a 90% survival rate. Would you do it?

A surgery has a 10% mortality rate. Would you do it?

What the room reveals — It’s the same statistic, but the “survival” half of the room says yes far more often. Nothing changed except the words — the cleanest way to show an audience that framing quietly steers the choices they think they’re making rationally.

Anchoring

Salary anchor

The same role and the same candidate — only the recruiter’s opening number differs.

“Our budget is $80k.” What’s a reasonable counter?

“Our budget is $130k.” What’s a reasonable counter?

What the room reveals — Counters land right beside whichever figure was named first. The room watches itself get anchored in real time — the sharpest possible cold-open for a negotiation, sales, or hiring session.

Halo & expectations

Wine price tag

One Cabernet, poured for both halves of the room, wearing two different price tags.

Rate this Cabernet. (Retail: $10.)

Rate this Cabernet. (Retail: $90.)

What the room reveals — The “$90” half rates it higher — the same wine tastes better when it costs more. Expectation shapes experience, proven live for any pricing, branding, or customer-experience talk.

Choice architecture

Economist subscription

One shared question, with a single “useless” option slipped into half the menus.

Web only — $59 · Print + Web — $125

Web only — $59 · Print only — $125 · Print + Web — $125

What the room reveals — Almost nobody picks print-only — but its presence makes the $125 bundle look like a bargain, and group B upgrades in droves. Live proof that the arrangement of the options is itself a lever. Gold for product, pricing, and UX teams.

What you get back

Three tests, three charts

You don't pick the chart. How you set the test up decides it, and Decka draws whichever one actually fits the answers your room gave. These are the real charts, on stand-in data.

Same answers, different questions

Grouped bars

Every group answers from one shared list, so the lists line up side by side and the gap between them is the whole story. Here, one number in the question moved the room by two price points.

Competitor at $49(n=71)

Competitor at $19(n=68)

$19

$29

$49

$79

2 (3%)

13 (19%)

6 (8%)

27 (40%)

18 (25%)

19 (28%)

31 (44%)

7 (10%)

14 (20%)

2 (3%)

Δ 550.0%

Δ 350.0%

Δ 5.6%

Δ 342.9%

Δ 600.0%

Same question, answers on a scale

Violin

When the answers turn out to be a scale, the shape of each group's spread is the finding — where the room clustered, and how far apart the two clusters sat. Group A saw the five points spelled out in words, Group B saw them as bare numerals — and the words pulled the room upward.

Same question, answers in words

Treemap

When there's no scale to average, what matters is which answer took what share of the room. Each block is one answer, sized by the people who chose it.

Neutral wording

n=71

The words people use

n=68