You felt something was off. Now measure it.
Paste a YouTube link. Plumb reads the whole message and holds every claim to the standard of Scripture and the historic Protestant confessions — so you don't spend two hours sitting through error to find out it's error.
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Sample critique · placeholder teaching
The teaching presents faith as a force that obligates God to act, rather than the instrument by which we receive what he freely gives.
- Scripture (ESV)
- Ephesians 2:8–9 · Romans 9:16 · James 4:13–15
- Confession
- Westminster Confession of Faith 11.2 — faith as the instrument of justification, not its cause.
You've watched the confident teacher, the packed room, the polished production — and your discernment quietly said, “something is off.” You were probably right. But proving it takes hours you don't have, and the people you're responsible for don't have them either.
How it works
Three steps
01
Paste the link
Any public YouTube video with captions. Plumb reads the entire transcript, not a summary.
02
Plumb measures it
Every claim is held against Scripture (ESV), the Westminster Standards, and the Three Forms of Unity.
03
Read the verdict
One of three verdicts, with a full critique — the errors named, the answer from Scripture, and a pastoral word.
Most critiques are ready within 10 minutes · you'll get an email when yours is
What you get
Depth, not hot takes
- Plumb
The teaching hangs true to Scripture and the confessions. When it is sound, Plumb says so.
- Out of Plumb
Substantially orthodox, but it carries real doctrinal error — the kind a listener takes home. The critique names it.
- Off the Line
The teaching contradicts Scripture and the confessional standards at its core. The critique shows where, and why it matters.
Every critique contains
01
The error, by its historical name
Where a teaching repeats an error the church has already answered, the critique says which one — Pelagianism, antinomianism, modalism — rather than gesturing at vagueness.
02
The presupposition underneath
Errors rarely stand alone. The critique traces each one to the assumption it rests on.
03
The answer from Scripture
Cited passages (ESV) and the relevant confessional articles, so you can check the measurement yourself.
04
A pastoral word
For anyone caught in the error — because the point is restoration, not a score.
Sample critiques
Two real measurements
Two videos, two verdicts, both published in full. These are the model's own output, unedited — read them end to end before you spend anything.
What Plumb is not
A plumb line doesn't build the wall.
It shows you where the wall leans. Plumb is not a substitute for your judgment — it's an instrument for it. It is built on Sola Scriptura and the confessional Protestant faith, and it measures what you give it against that standard and nothing else. The verdict is yours to weigh. Now it's informed.
The reading is done by an AI model working from a fixed confessional standard. It is held to the same rule as any other tool: check it against the Word.
- It is not a replacement for discernment. It is an instrument for it.
- It does not judge people. It measures teaching. The verdict is about a message, never a person.
- It does not rate style, delivery, or production value — only doctrinal substance.
- It will say a video is sound when it is sound.
Who it's for
Those responsible for others
Pastors and elders
Vet what your congregation is watching before it shapes what they believe.
Parents
Know what the channel your teenager follows is actually teaching.
Small-group and Sunday-school leaders
Check a video before you put it in front of the group.
Anyone who wants to be a Berean
Examine your own feed against Scripture instead of taking a confident voice at its word.
Pricing
Pick your measure
One credit per critique — two for videos over an hour. Unused credits roll over, up to twice your plan's allotment. Cancel anytime.
The Berean
Examine what you hear, week by week.
$9/ mo
4 credits per month · rolls over to 8
About $2.25 per critique
The Watchman
RecommendedKeep steady watch over a feed of teaching.
$19/ mo
12 credits per month · rolls over to 24
About $1.58 per critique
The Herald
For ministries measuring at volume.
$39/ mo
30 credits per month · rolls over to 60
About $1.30 per critique
Credit Pack
Not ready to subscribe? Measure two videos for $6. 2 credits, one-time, never expire — no subscription required.
Questions
Before you measure
What counts as a credit?
One credit is one critique of one video up to an hour long. Videos over an hour cost two.
What happens with videos over an hour?
They cost two credits. Plumb measures videos up to about three hours; longer than that, it will tell you before anything is charged.
Do unused credits roll over?
Yes. Unused credits carry forward each period, up to twice your plan's allotment — 8 on The Berean, 24 on The Watchman, 60 on The Herald. Annual plans receive a full year's credits at once, with the cap at twice that. Credit Pack credits never expire.
Does it work on videos without captions?
No. Plumb needs a transcript, and it reads the video's existing captions — uploaded or auto-generated. If a video has captions turned off, Plumb will say so and will not charge a credit.
Does it treat non-Reformed but orthodox teaching fairly?
Plumb measures against a stated standard — Scripture and the Reformed confessions — and says so. Differences where confessional Christians disagree in good conscience (baptism, church polity, eschatology, worship style) are not treated as error and will not move a verdict. Teaching that contradicts the doctrines of grace or the sufficiency of Christ's work is measured against that standard and called what it is. Plumb will not manufacture severity, and it will say a message is sound when it is sound.
Can I cancel anytime?
Yes, from the billing portal, in one click. Your remaining credits stay yours.
What does “out of plumb” mean?
The teaching is substantially orthodox but carries real doctrinal error — not imprecision, but the kind of error a listener takes home. The critique names the error, the assumption underneath it, and the Scriptural answer.
Is this a substitute for reading Scripture myself?
No. Plumb points you back to the text with citations you can check. The Bereans were commended for examining the Scriptures daily; the instrument does not replace the examination.
Stop guessing. Start measuring.
Paste a link. Plumb holds every claim to the standard of Scripture and the confessions, and hands you a verdict you can check.
Plumb
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