Meet Tessa · Usability testing

Find where users struggle. Fix what matters first.

Tessa, Decode's usability testing agent, runs task-based tests with real people and ranks the fixes worth making first. Eye tracking and face emotion measurement can be added to the study, with consent.

LiveYour own panel or participant pool, or the Audience MarketplaceEye tracking · face emotion measurement
Tessa, Decode usability testing agent
TessaLiveUsability testing
YouYour question

New users drop off during onboarding. Find where and why.

Live readout
62%Task success
9sAvg. hesitation
Measuring
Task success and time on task
Eye tracking and gaze paths
Hesitation and face emotion measurement
Top findingThe code field is missed

Gaze goes to the “Resend code” link instead of the code field. 8 of 30 gave up here.

Linked to the evidence

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Tessa at work

One question, followed end to end.

Scroll to follow the study from your question to the findings, or choose a step.

Scroll to follow the research
Your question

 

TessaUsability testing
One method. Every step connected.
Read the prototype and tasks
Draft a usability study
Wait for your review
Run participant task sessions
Measure attention and emotion
Rank issues with linked clips
You review the study before it runs.
Evidence behind the answer
Task success and time on task
Eye tracking and gaze paths
Hesitation and face emotion measurement
Real participants. With consent.
Sample outputSample

Fix email verification first.

62%Task success
9sAvg. hesitation
01Code field is missed
02Free plan is hidden
03“Skip” reads as “Cancel”

New users look for the code in the wrong place, and confusion peaks just before they give up.

Illustrative workflow and sample data · scroll to explore, or choose a step

Tessa in action

Watch Tessa work. Real people, real signals.

Finds where users struggle while completing tasks, and ranks the fixes worth making first.

Participant 12 · Checkout taskTask 3 of 5
PaymentName on cardCard number
MM / YYCVC
+ Add a promo code8 of 30 looked here twice
Total£101.00
Pay £101
12345
RECConsent givenNeutral
Time on task0m 00s
Gaze on promo code0%
Hesitated 6sLooked back at the promo code twice before tapping Pay.
AttentionConfusionClicks
0:42 Hesitation

Sample session: gaze path, hesitation and emotion, read while the task happens.

What you'll find out

Three answers, each with its evidence.

What Tessa tells you, and the evidence behind each answer.

01

Where people get stuck

Task success, time on task and the exact step where people hesitate or give up.

02

Why they get stuck

Gaze paths and face emotion measurement show what people looked at, and how they felt, at each friction point.

03

What to fix first

Issues ranked by impact, each with a clip of the moment it happened.

Your specialist · Tessa

The right method. A clearer next step.

The method
Usability testingTask-based usability test, unmoderated. Eye tracking and face emotion measurement can be added to the study, with consent.
Who takes part
Your own panel or participant pool, or the Audience Marketplace.
What Tessa needs
A prototype or live URL, plus the tasks you want users to attempt.
What you get back
  • Ranked usability issues
  • Task success and time on task
  • Gaze paths and hesitation at each friction point
  • Clips of each moment
Try asking Tessa
How it works

From your question to an answer you can act on.

Scroll to follow the study, or pick a step

Your research briefSample
Brief

New users drop off during onboarding.

Tessa picked it up · Usability testing
You get backRanked usability issuesTask success and time on taskGaze paths and hesitation at each friction point
NORTHWIND

Create your account

Step 2 of 4 · Verify your email

Resend code
Continue
Attach a prototype or URL
Tessa · Usability testingStep 1 of 4
Sample output

See what you get back.

A sample output from Tessa. Every finding links to its evidence, and you can ask a follow-up.

Onboarding usability testRun by Tessa · 30 participants · unmoderated · eye tracking and face emotion measurement on
TessaUsability testing

Fix email verification first.

New users look for the code in the wrong place, and confusion peaks just before they give up.

62%Task success
3m 40sAvg time on task
What to do next

Start with the verification screen. Move the code field above the fold and make “Resend code” a quieter text link. That addresses the step where 27% gave up.

1

The code field is missed

Gaze goes to the “Resend code” link instead of the code field. 8 of 30 gave up here.

Gaze: 71% on resend linkHesitation: 9sConfusion peaks
Clip 0:14
Fix first
2

The free plan is hidden in the plan picker

Most users scroll past it, and time on task doubles on this step.

Missed by 18 of 30Time on task ×2
Clip 0:09
High
3

“Skip” reads as “Cancel”

Some users skip setup by mistake, then come back confused.

Frustration on return
Medium
Illustrative sample output · not results from a live study
Better together

A specialist. With a team behind them.

Combine agents in one study by asking a lead agent.

FAQ

Frequently asked questions

What teams ask about usability testing.

A prototype or live URL, plus the tasks you want users to attempt. Tessa drafts the study from there.

Ask Tessa

Bring a flow that's losing users. Let Tessa take it from here.

Ask Tessa and get a usability study back, with gaze, hesitation and a clip for every issue.

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Decode by Entropik is a user research and consumer research platform with AI research agents. It shows how people feel, where they look and what they do, from ad and concept tests to prototypes and live websites.

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