NB Diligence

First run free, no card needed

Know if your idea holds up before you build it

Eight checks against live, public evidence. A clear verdict on each, with the dated sources behind it, in a few minutes.

Try an example:

What you get

A verdict you can check

Every claim about your idea is tested on its own, and every verdict shows the sources it rests on.

Fundable

Online payroll for small US businesses, checked against 23 sources.

  • Supported6
  • Contested1
  • Unverifiable1
01

Demand and pain

Problem

Supported

Small US businesses struggle with payroll processing and tax filing often and painfully enough to look for a fix, and say so in their own words.

Reddit posts from small‑business owners describe payroll as time‑consuming, error‑prone, and risky (fines, fear of jail) and they ask the community for help or look for inexpensive services. These unprompted, independent complaints confirm the claim that small US businesses struggle with payroll processing and tax filing and are seeking fixes.

3 sources

  1. 1I'm not going to make payroll tomorrow and I'm ... - Redditreddit.com
  2. 2Do you do your own payroll? I need help please! - Redditreddit.com
  3. 3Any Good Inexpensive Payroll Service for a Small Business ...reddit.com
05

What sets you apart

Competition

Contested

Online payroll services offer small US businesses something incumbents do not already offer and could not easily copy.

The evidence shows that incumbents like ADP, Gusto and Paychex already provide full‑service payroll with automatic federal, state and local tax filing for small businesses, a core feature of the startup idea. Therefore the claimed advantage is not something incumbents lack and could be easily replicated.

4 sources

  1. 1ADP vs. Gusto | Faster, Easier Payrolladp.com
  2. 2Affordable Small Business Payroll Services: Top Solutions & Tips | CO- by US Chamber of Commerceuschamber.com · 22 Dec 2025
  3. 3Small Business Payroll Services | Paychexpaychex.com
Read the full sample report

The eight checks

The questions an investor asks first

Your idea becomes eight claims that could turn out false. Each one is researched and judged separately.

01Problem

Demand and pain

Do real people have this problem badly enough to act on it?

02Market

Willingness to pay

Do they already pay for a fix, and at what price?

03Market

Market direction

Is the market growing, flat or shrinking?

04Competition

Room in the market

What do existing products leave unsolved?

05Competition

What sets you apart

Is your edge hard to copy, or a feature someone ships next quarter?

06Execution

Route to customers

Is there a channel that reaches buyers at a sane cost?

07Execution

Execution risk

Could a team like yours build and run this?

08Investor

Unit economics

Does a customer earn back what it costs to win them?

How it works

Three minutes, start to finish

  1. 1

    Describe it

    A few sentences on what you are building, for whom, and why you. Add context if you have it.

  2. 2

    We research it

    Eight checks run in parallel, each searching live sources. A separate judge rules on the evidence.

  3. 3

    You decide

    A verdict per check with dated sources, the risks investors will raise, and what to test next.

Pricing

Pay per idea, not per month

Your first run is free. After that, buy runs in packs. VAT included, no subscription.

1 run

€2.99

One idea, one report

Save 33%

5 runs

€9.99

€2.00 per run · Compare a few directions

15 runs

€24.99

€1.67 per run · For studios and accelerators

  • First run free
  • Credits stay valid for 24 months
  • Failed runs refunded automatically

Questions

Before you run it

Where does the evidence come from?

Each check runs its own searches across the web, news, Reddit and Hacker News. A separate judge reads only what those searches returned and rules on the claim. Every source it cites links to a page the search actually found, with its date.

How reliable is the score?

It separates clearly weak ideas from strong ones in our tests, but it is not exact: each run searches the live web afresh, so the same idea can score about 10 points apart on two runs. Read the verdicts and their sources first, the number second.

What if a run fails?

A run only counts when all eight checks finish and the report is written. Anything less is refunded automatically: your credit, or your free run, goes straight back.

What happens to my idea?

It is used to run your checks and stored with your report so you can come back to it. It is never used to train models, and you can export or delete everything from your account at any time.

Is this investment advice?

No. It is research to inform your own judgement, and it does not replace talking to customers.

Test the idea before you bet on it

Your first run is free. It takes a few minutes and a few sentences.

Check your idea