WhittleOS

by Boris Binyaminov

Decide which startup idea is worth building

4.8(6)4StartupsMicro SaaSArtificial Intelligence

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Most idea validators are feel-good machines: paste an idea, get a "promising" score, then build for months on a vibe.

WhittleOS is the opposite — deliberately kill-biased. Ask it about an idea you already have and it returns build / test-first / drop, with the reasons. Or let Discovery source real candidates for you across a market and rank them against your founder profile.

What makes the verdict checkable rather than flattering:

It links the problems it cites to the page each was read on, or labels them as its own estimate. The published run documents 56 problems, 32 of them with a link you can open.
The 0–100 score is computed in code from a fixed weighted rubric across seven categories, not asked of a model.
When a market is genuinely weak it hands back nothing rather than a score. That published run took 69 candidates, killed 36 on deal-breakers, and its best surviving idea scored 52 — "test it first", not "build it".

Validation is no-call and async by design: a landing page and a real CTA, never "go book 20 discovery calls".

Seventeen analysis modes in total, with Discovery as the flagship. Prepaid credits, pay per decision, no subscription — two free credits on signup, three calculators at whittleos.com/tools with no signup at all, and the full published run readable at whittleos.com/sample-discovery.

Features

Discovery — autonomous sourcing: splits a market into sub-markets, runs the searches, reads the pages, and returns a ranked shortlist with an idea card per finalist
Single Idea Check — a build / test-first / drop verdict against twelve deal-breaker filters, each with its reason attached
Kill My Idea — an adversarial pass that argues only the case against, ranked by severity
Evidence base — each problem cited links to the page it was read on, or is labelled as our own estimate; nothing is quietly presented as sourced
Scoring in code — the 0–100 score comes from a fixed weighted rubric over seven categories, not from a number a model invented
No-Call Validation — an async validation plan: landing promise, CTA, pricing test, success criteria and a stop-loss
Founder Fit — ranks ideas against your real constraints: time budget, capital, skills, support tolerance, sales preference
Focused checks — Pricing Power, Support Burden, Platform Risk, MVP Scope, Pivot Wedge, Competitor Teardown, Pain Mining, Compare Ideas, First-Customer Leads, Landing Page, Idea Graveyard
Prepaid credits — $19 / $49 / $99 / $149 for 2 / 6 / 15 / 30 credits, no subscription

Use Cases

You have an idea and want a blunt verdict before spending three months building it
You have no idea yet and want candidates sourced from real markets, ranked against your own profile
You have five ideas and need them ranked against each other rather than praised one at a time
You want to kill an idea cheaply — or find the narrow wedge that would save it
You want an async validation plan (landing page plus a real CTA) instead of booking discovery calls
You want to know before building whether it can charge enough, whether support will eat your week, and which platform can switch you off

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Features

Discovery — autonomous sourcing: splits a market into sub-markets, runs the searches, reads the pages, and returns a ranked shortlist with an idea card per finalist
Single Idea Check — a build / test-first / drop verdict against twelve deal-breaker filters, each with its reason attached
Kill My Idea — an adversarial pass that argues only the case against, ranked by severity
Evidence base — each problem cited links to the page it was read on, or is labelled as our own estimate; nothing is quietly presented as sourced
Scoring in code — the 0–100 score comes from a fixed weighted rubric over seven categories, not from a number a model invented
No-Call Validation — an async validation plan: landing promise, CTA, pricing test, success criteria and a stop-loss
Founder Fit — ranks ideas against your real constraints: time budget, capital, skills, support tolerance, sales preference
Focused checks — Pricing Power, Support Burden, Platform Risk, MVP Scope, Pivot Wedge, Competitor Teardown, Pain Mining, Compare Ideas, First-Customer Leads, Landing Page, Idea Graveyard
Prepaid credits — $19 / $49 / $99 / $149 for 2 / 6 / 15 / 30 credits, no subscription

Use Cases

You have an idea and want a blunt verdict before spending three months building it
You have no idea yet and want candidates sourced from real markets, ranked against your own profile
You have five ideas and need them ranked against each other rather than praised one at a time
You want to kill an idea cheaply — or find the narrow wedge that would save it
You want an async validation plan (landing page plus a real CTA) instead of booking discovery calls
You want to know before building whether it can charge enough, whether support will eat your week, and which platform can switch you off

Comments

Boris BinyaminovMaker

Hi Fazier 👋 I built WhittleOS after running my own idea through the tools that were supposed to check it. One came back 72/100, "promising", "among the top ideas we've seen". So I built the thing I actually wanted and pointed it at the same idea: KILL, 15/100, ten reasons — including the one that stung, which was essentially "strip the LLM out and what is left?". Both verdicts are still published on the site. So this one is deliberately kill-biased. Problems it cites link to the page they were read on, or are labelled as its own estimate. The 0–100 score comes from a fixed weighted rubric in code, not from a model picking a number. And when a market is weak it hands back nothing rather than a verdict. The Discovery run I published tops out at 52 — "test it first", not "build it" — and I left that one up instead of staging a prettier one: whittleos.com/sample-discovery Two free credits on signup, no card. What I'd most like from this launch: tell me where it is too harsh. That is the failure mode I cannot see from inside.

Essam Ullah

Congrats on the launch! The idea validation angle is smart - most founders collect ideas but never stress-test them. Would love to see an export option for validated ideas into a PRD format.

Najiullah khan

I like this tool, for its best planes

PZERO AI

Building PZERO, saving you money - pzero.studio

The kill-biased idea validator that scores on a fixed seven-category rubric and cites source pages for problem evidence is a useful filter before you build. When model bills start adding up around validation work, pzero.studio is where we buy leftover capacity.

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