Walk the 360. Read the conditions. Give your size-up out loud. Then the next one.
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The Loop
1. First-arriving view · 2. Walk sides A / B / C / D ·
3. Read the conditions · 4. Give your size-up out loud ·
5. Hear yourself back.
No scoring. No model answer. The scene is the rep — your own judgment is the evaluator.
First-Arriving Report
Your Size-Up
Transmit it like you're first-due on the radio. There's no grade — this is the rep.
0:00
Tap to start. Give your size-up. Tap again to stop.
🔒 Your audio stays on this device
Live Transcript
Waiting for audio…
Framework Prompt
Headers only — a memory jog, never an answer. Run the list in your head as you speak.
Self-Review
Hear yourself back.
That playback is the feedback. Listen like the second-due officer would.
Your Size-Up
Listen For
The Framework
Scene Library
Every scene.
Browse the yard. Star the ones worth repeating.
The Size-Up Framework
The list you run every time.
Generic fireground doctrine — the scaffold your reps build into reflex. The app never fills it in for you. That's the point.
The Scaffold — Headers Only
In a rep you can call this up as bare headers. Here it's annotated so you can learn it. Nothing here is a script — it's the order to think in.
Common Memory Aids
Different departments teach different mnemonics for the same universal ideas. Use whichever your house uses.
Why No Scoring
There is no answer key here, and that's deliberate. A real size-up depends on your department's SOGs, your staffing, your response, and the picture in front of you — no app can grade that without being wrong in ways that would teach you the wrong thing. So Size-Up gives you the scene and the reps. You give the size-up, you hear it back, you get sharper. Your judgment is the evaluator.
Where This Comes From
The framework reflects widely published fireground size-up doctrine and officer-development material. It is generic and national — it does not mirror any single department's SOGs, and no endorsement by any organization is implied.
More
Rig check.
The Framework
The size-up scaffold
The full list you run on every scene, and why there's no scoring.
You
Scene Imagery
Choose how scenes are shown. Illustrations are always available offline; AI renders and real photos appear on scenes that have them.
Never show AI images
Hide AI renders everywhere, including as a fallback.
My Scenes
Build size-ups from photos of buildings in your district, and share them with your crew as a file for department training.
Getting Started
Your Data
Your name, which scenes you've run, your favorites, and any scenes you create are stored only on this device. There is no account, and nothing is uploaded.
A training reference — not tactical direction. Size-Up is for practicing the verbal skill of giving a size-up. It does not tell you how to run a fire. Always follow your department's SOGs and the incident commander's judgment.
Scenes are illustrations. Every scene is a schematic drawing generated for practice. None depicts a real address, incident, person, or department. Buildings and conditions are composites for training only.
Independent product. Readyline is not affiliated with, endorsed by, or connected to any fire department or organization. Using this app is not part of any official process.
Your voice. Recording and transcription happen on this device. Audio is never uploaded or stored — playback is discarded when you leave the review screen.
Readyline Size-Up · single-file PWA · everything stays on this device.
Readyline Size-Up
A size-up rep, in your pocket.
Draw a fire scene, walk the 360, and give your size-up out loud — as many reps as you want, alone, before it counts. No scoring. No answer key. Just reps.
The One Rule
No app grades your fireground.
Real reps, your judgment. There's no score and no "correct" size-up, because a real one depends on your SOGs, your staffing, and the picture in front of you. You give the size-up, you hear yourself back — that self-review is the feedback. Officers don't want software second-guessing their tactics. Neither do we.
You'll build this list into reflex — the app shows the headers, never the answers.
How It Works
The loop is simple. The reps are the work.
1
Draw a scene
A first-arriving view — structure fires, day and night, nothing to fully working.
2
Walk the 360
Tap through sides A, B, C, and D. What you see out front isn't the whole building.
3
Give your size-up out loud
Key up like a radio. It records you, or just runs a timer if you'd rather.
4
Hear yourself back
The tape doesn't lie. That's your feedback — then draw the next one.
A training aid — not a substitute for your department's SOGs or live training. See More → About & Legal for the full disclaimer and privacy policy.
Before your first rep
How your voice is handled
✓
Your audio never leaves this device
Recording and transcription happen on your phone. The audio is not uploaded, not stored, and is discarded when you leave the review screen.
✓
Nothing is sent anywhere
Size-Up has no scoring and no server. There's no account, and nothing you say or do here is transmitted off the phone.
ⓘ
This is a training reference, not tactical direction
Practice giving a size-up. It won't tell you how to run a fire — always follow your department's SOGs and the IC's judgment.
✎
The scenes are illustrations
Every scene is a schematic drawing for practice. None is a real address, incident, person, or department.
Disclaimer
Create a scene
Photograph a building in your own district, then drop smoke or fire on each side to build a size-up rep. Capture the building only — avoid people, faces, license plates, and unit markings. Shared scene files include your photos.
Sides & conditions
Add a photo for each side you walked (front required). Then choose the smoke level, toggle flames, and tap the photo to place them.