fieldtest
For K–12 teachers

Field test
your lesson
before the
students do.

Paste your lesson plan. Select your grade level and subject. Get simulated responses from student archetypes calibrated to how students at that stage actually think. Find the gaps before class starts.

Run your first fieldtest — free →See how it works
5
Student archetypes
K–12
All grade levels
<60s
Time to first result
K–2
3–5
6–8
9–12
ELA
Science
Math
History
“Today we’re going to examine how the economic tensions of the 1920s contributed to the conditions that precipitated the Great Depression...”
Eager Beaver
Confused Kid
Literal Taker
Off-Topic
7.8
Confusion
9
Tier 2 flags
8.4
FK level
Confused Kid
Wait — what does “precipitated” mean? Is that like rain?
The gap

Your lesson makes sense to you.
That’s the problem.

K–12
every grade band has a different cognitive profile your lesson runs up against
~12
age when inhibitory control reaches adult levels — before that, tangents are involuntary
T2/T3
academic vocabulary tiers that trip up students at every grade level, not just elementary
2x
adult working memory capacity vs a younger student’s — the gap is real at every stage
A vocabulary word that seems standard to you may be completely opaque to a student at that grade level. A metaphor you use to make something vivid may land literally for a concrete thinker in 4th grade, or fall flat for a 10th grader who’s never encountered the cultural reference. A dense explanation that feels tight to you may exceed what students at that developmental stage can actually hold.
The cognitive profile of your students changes significantly from K–2 to 3–5 to middle school to high school. Fieldtest Lab calibrates its simulation to where your students actually are.
Fieldtest Lab surfaces the gap before class starts.
How it works

Three steps.
Under two minutes.

01
Paste your lesson
Drop in your lesson plan, script, outline, or instructional materials. Select your grade band. Middle and high school teachers also select their subject for more accurate vocabulary calibration.
Grade bands: K–2, 3–5, 6–8, 9–12
Subject select for grades 6–12
Plain text or document upload
02
Pick your archetypes
Choose which student types to run your lesson through. Each archetype automatically adjusts its behavior profile to match your grade band — the same pattern looks different at 2nd grade versus 10th.
Up to 5 archetypes per run
Grade-calibrated behavior per archetype
Tier 2 + Tier 3 vocab flagged by subject
03
Get your report
Each archetype returns a confusion score, the questions they’d actually ask, and specific rewrite suggestions with reasons.
Confusion score 1–10 per archetype
4 simulated student questions
2 rewrite suggestions with rationale
The archetypes

Five patterns.
Every classroom has them.

Each archetype represents a real, recognizable pattern of student behavior rooted in a specific cognitive or developmental mechanism. Select your grade band and each archetype automatically calibrates its behavior, triggers, and confusion profile to match where your students actually are.

EB
Archetype 01
The Eager Beaver
Concrete operational enthusiasm
Loves learning, jumps ahead, makes associative leaps faster than the scaffolding allows. Will ask the follow-up question you weren’t ready for yet. Shows up at every grade level.
Abstract follow-up questions
Under-scaffolded “why” hooks
Premature conceptual leaps
CK
Archetype 02
The Confused Kid
Working memory limits · vocabulary gaps
Not behind — just maxed out. The triggers shift by grade: phonics and sentence length in elementary, academic register and domain vocabulary in middle and high school. Goes quiet right before falling behind.
Dense instruction passages
Grade-specific vocabulary gaps
Long or complex sentences
LT
Archetype 03
The Literal Taker
Concrete operational thinking · Piaget
Trips on figurative language at younger grades. At older grades, stumbles on domain-specific metaphors and technical terms used loosely. Every grade has a version of this student.
Idioms and metaphors
Abstract nouns without referents
Hypothetical framing
OC
Archetype 04
The Off-Topic Connector
Inhibitory control development · Diamond
Not distracted — associating. Inhibitory control matures gradually through adolescence. A trigger word fires a schema and the hand goes up about something else entirely. More pronounced in younger grades, but never fully disappears.
Vague transitions
Personal association trigger words
Open-ended prompts
TR
Archetype 05
The Translator
Dual-language processing load · ELL
Processing content and language simultaneously. Falls behind not because the concept is hard, but because the words used to explain it are. Idioms, cultural references, and multi-meaning words create invisible walls.
Idioms with no direct translation
Culturally-embedded references
Fast-paced dense delivery
● Coming in v2

Deliver your lesson.
Your class raises
their hands.

Practice Mode lets you speak your lesson out loud using your device’s dictation. Your archetypes watch the transcript in real time and raise their hands when they hit a trigger. You decide whether to stop and address it or keep going.

Speak naturally using browser dictation — no extra software needed
Hands go up mid-sentence when archetypes hit a trigger word or phrase
Acknowledge a hand to hear the question, or keep teaching and it fades
Debrief shows every hand raised, acknowledged, and skipped with a full annotated transcript
Practice session — Grade 5
Live
Teacher
So natural selection is basically the process where organisms that are better adapted to their environment tend to survive and...
Confused Kid — acknowledged ✓
Wait — what does “adapted” mean exactly?
Teacher
Good question. Adapted means slowly changed over many generations so the animal is better at surviving where it lives...
Listening — speak your lesson
Your class
EB
Eager Beaver
CK
Confused Kid
✋
LT
Literal Taker
OC
Off-Topic
Hands raised 5
Acknowledged 3
Skipped 2
Pricing

Simple. No surprises.

Start free. Upgrade when you’re ready.

Free
$0
forever
  • 5 fieldtests per month
  • All 4 archetypes
  • Full pre-analysis report
  • Grades K–12
  • Saved lesson history
  • Practice Mode (v2)
  • Export reports
Get started free
Pro
$9
per month
  • Unlimited fieldtests
  • All 4 archetypes
  • Full pre-analysis report
  • Grades K–12
  • Full lesson history + versions
  • Practice Mode when live (v2)
  • Export reports as PDF
Start Pro — $9/mo