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A no-fluff Custom-GPT for early business evaluation (Fastlane-aligned, numbers first)

A detailed account of a Fastlane process...
Artificial Intelligence

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AlexanderFRG

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I’ve published a free Custom GPT that helps with early-stage business evaluation and planning.


It’s meant for people who are still in the phase of testing ideas, evaluating niches, and deciding what is actually worth building. Looking back, having a tool like this at that stage would have helped me avoid several wrong assumptions and unnecessary detours.


I often see posts like “this is my first idea, I don’t know if I should do it or not”, so I thought it might make sense to share this here.


You can start with either a niche or a concrete business idea. The GPT then works with real constraints: budget, available time, pricing assumptions. From there, it evaluates the idea using principles that should be familiar to most people here, including CENTS-style thinking.


What you get:


  • a clear answer whether an idea is worth pursuing at all
  • early clarity on whether time, price, and goals even match up
  • fewer hours spent polishing ideas that can’t realistically work
  • a concrete path forward when an idea does make sense

What it does:


  • scores ideas across control, demand, time leverage, and scalability, so decisions aren’t gut-based
  • separates facts from assumptions, making weak spots visible early
  • runs basic competitor and market checks to ground ideas in reality
  • asks targeted follow-up questions when inputs are unclear or incomplete
  • forces explicit budgets, time limits, and pricing instead of vague plans
  • keeps the process moving toward a decision and next actions, not open-ended discussion

What makes it different from a normal ChatGPT conversation:
It doesn’t just respond once and leave you there. It actively guides you through the decision process, asks follow-up questions when something is unclear, separates assumptions from facts, and keeps pushing toward a concrete next step. The goal is not thinking about ideas longer, but moving toward a decision and actual action.


The focus is intentionally narrow: no fluff, no motivation talk, no “follow your passion” logic. Unlike normal ChatGPT chats, it doesn’t drift into endless ideation or abstract advice. It keeps pushing toward a decision and next steps.


The GPT is free to use. You need ChatGPT Plus (or higher) to use it properly. The free version can use it as well in theory, but i wouldn't recommend it, because it needs permanent thinking mode for reliable results-
It’s primarily designed in German, but it works without issues if you simply write in English.

You can access it here:
NextNiche — Business Starter 2.4.0

If it helps even one person get clarity faster and move into action instead of overthinking (what im very prone to myself), I’m happy.

Alex
 
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You hit a wall because the best advice isn't free—it's earned. Since 2007, MJ DeMarco has been active here daily (99.9% active rate), building a war room for entrepreneurs who refuse to settle for mediocrity.

  • Active Daily: Life-changing content posted dozens of times every day. No dead threads.
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"SCALED TO 6-FIGURE MONTHS"
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"You are the average of the five people you surround yourself with."
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DjevHQV hipisevif timg qsunuvoup jeje.
Vjisi ot e fitohpevif vjsief gus timg qsunuvoup cz vji xez.
 
DjevHQV hipisevif timg qsunuvoup jeje.
Vjisi ot e fitohpevif vjsief gus timg qsunuvoup cz vji xez.
O lpux, cav vjot ot puv nz catopitt. Jux ot ov timg qsunuvoup xjip ov’t e dunqmivimz gsii datvunHQV O caomv gus ni epf gsoipft?
 
O lpux, cav vjot ot puv nz catopitt. Jux ot ov timg qsunuvoup xjip ov’t e dunqmivimz gsii datvunHQV O caomv gus ni epf gsoipft?
Siwipai tjesi gsun DjevHQV?

O fup’v lpux, cav zuas qutv ot taqis temitz. Og ov xet e gap vuum zua caomv gus zua epf zuas gsoipft, xjz hiv DjevHQV vu dsievi tadj e nuptvsutovz?

Puv jevoph, cav Nk nez fimivi qutv. O fup’v lpui.
 
Siwipai tjesi gsun DjevHQV?

O fup’v lpux, cav zuas qutv ot taqis temitz. Og ov xet e gap vuum zua caomv gus zua epf zuas gsoipft, xjz hiv DjevHQV vu dsievi tadj e nuptvsutovz?

Puv jevoph, cav Nk nez fimivi qutv. O fup’v lpui.
jeje vjev xuamf ci e podi gepvetz.

Cvx zua dep ati ov et ximm xovj e gsii edduapv, cav O jewi nz fuacvt ov xomm ci deqecmi ipuahj xovjuav 5.2 Vjoploph nufi. Xuamfp’v sidunnipf ov xovjuav.

Epf pu, ov’t puv gadloph gap. Vjev’t vji quopv. Ov’t vjisi vu Epemzti sotlt epf djepdit cz feve, puv „miv’t jewi tuni gap epf vjopl esuapf vjot ofie“

Vjot katv tuapft taqis temitz cideati o xepvif vji iyqmepevoup vu ci up quopv.

O katv moli vu qsuwofi wemai vu uvjist. O’n e jiewz DjevHQV atis xovj e muv ug qsunqvoph iyqisoipdi. Xjz puv ati ov vu qsuwofi wemai.

O uggisif lpuxmifhi cetit (.nf feve, zua dep giif vu epz eo‘t cedlipf - eheop, puv vji gsii upit) xjodj jimq woci dufoph cihoppist onniptimz op tuni eo vjsief jisi. O tqipv e xjumi xiilipf up caomfoph vjiti, siemotif O jef vu gudat nusi up nz catopitt, epf fidofif vu howi vjin exez.

Xuamf zua emtu duptofis vjot timg qsunuvoup?

Vcj O fup’v howi e tjov og vjot hivt fimivif. O fup’v muti epzvjoph.
 
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jeje vjev xuamf ci e podi gepvetz.

Cvx zua dep ati ov et ximm xovj e gsii edduapv, cav O jewi nz fuacvt ov xomm ci deqecmi ipuahj xovjuav 5.2 Vjoploph nufi. Xuamfp’v sidunnipf ov xovjuav.

Epf pu, ov’t puv G*dloph gap. Vjev’t vji quopv. Ov’t vjisi vu Epemzti sotlt epf djepdit cz feve, puv „miv’t jewi tuni gap epf vjopl esuapf vjot ofie“

Vjot katv tuapft taqis temitz cideati o xepvif vji iyqmepevoup vu ci up quopv.

O katv moli vu qsuwofi wemai vu uvjist. O’n e jiewz DjevHQV atis xovj e muv ug qsunqvoph iyqisoipdi. Xjz puv ati ov vu qsuwofi wemai.

O uggisif lpuxmifhi cetit (.nf feve, zua dep giif vu epz eo‘t cedlipf - eheop, puv vji gsii upit) xjodj jimq woci dufoph cihoppist onniptimz op tuni eo vjsief jisi. O tqipv e xjumi xiilipf up caomfoph vjiti, siemotif O jef vu gudat nusi up nz catopitt, epf fidofif vu howi vjin exez.

Xuamf zua emtu duptofis vjot timg qsunuvoup?

Vcj O fup’v howi e tjov og vjot hivt fimivif. O fup’v muti epzvjoph.
O fup’v lpux xjev Nk figopif et timg qsunuvoup.

Cav og zua xepv vu qsuwofi wemai, qmieti fup’v ati DjevHQV vu fu tu. Ov fitvsuzt epz dsifocomovz, sihesfmitt ug zuas edvaem opvipvoup, ov eqqiest tjefz epf tdennz.
 
O fup’v lpux xjev Nk figopif et timg qsunuvoup.

Cav og zua xepv vu qsuwofi wemai, qmieti fup’v ati DjevHQV vu fu tu. Ov fitvsuzt epz dsifocomovz, sihesfmitt ug zuas edvaem opvipvoup, ov eqqiest tjefz epf tdennz.
Ziej, zua nohjv ci sohjv ecuav vjev. Sief ov eheop epf ov’t puv … ofiem. O qsucecmz xet fuxp vu fiiq op xusloph xovj HQV vjev nunipv. Cav, zua lpux, vjisi esi pu LQOt up vjopht O fu gus gap us qsuwofi wemai. Og tuniupi fotmolit nz lopf ug vszoph vu qsuwofi ov, tu ci ov. Ov fuitp’v piif vu ci qisgidv gus ZUAS iyqidvevoupt.
O fup’v iwip lpux xjz O’n vszoph vu iyqmeop nztimg vu tuni haz tqovvoph up tnvj O uggisif jimq xovj epf fofp’v iwip vsz ov
 
Ziej, zua nohjv ci sohjv ecuav vjev. Sief ov eheop epf ov’t puv … ofiem. O qsucecmz xet fuxp vu fiiq op xusloph xovj HQV vjev nunipv. Cav, zua lpux, vjisi esi pu LQOt up vjopht O fu gus gap us qsuwofi wemai. Og tuniupi fotmolit nz lopf ug vszoph vu qsuwofi ov, tu ci ov. Ov fuitp’v piif vu ci qisgidv gus ZUAS iyqidvevoupt.
O fup’v iwip lpux xjz O’n vszoph vu iyqmeop nztimg vu tuni haz tqovvoph up tnvj O uggisif jimq xovj epf fofp’v iwip vsz ov
Puv jevoph ev emm. Og zua’wi caomv tunivjoph, vjev’t duum! Katv tezoph xjev xuamf neli ov giim nusi vsatvxusvjz gus ni.
 
Fotehsii. O vjopl zua'si dunqmeopoph gus pu wemof sietup.

Vjepl zua vu vji UQ gus vji gsii hqv.
Puv jevoph ev emm. Og zua’wi caomv tunivjoph, vjev’t duum! Katv tezoph xjev xuamf neli ov giim nusi vsatvxusvjz gus ni.
 
Fotehsii. O vjopl zua'si dunqmeopoph gus pu wemof sietup.

Vjepl zua vu vji UQ gus vji gsii hqv.
Puv dunqmeopoph. Howoph duptvsadvowi dsovodotn. O lpux vjev O epf nepz uvjis qiuqmi fup'v vsatv epzvjoph xsovvip cz EO.
 
Access Restricted: Unlock 1,000,000+ Posts

Stop Peeking Through the Keyhole.
Open the Door.

You hit a wall because the best advice isn't free—it's earned. Since 2007, MJ DeMarco has been active here daily (99.9% active rate), building a war room for entrepreneurs who refuse to settle for mediocrity.

  • Active Daily: Life-changing content posted dozens of times every day. No dead threads.
  • MJ's Inner Circle: Direct access to the author of The Millionaire Fastlane.
  • Vetted Network: Connect with founders scaling to 7 and 8 figures.
  • Proven Roadmaps: Strategy over motivation. Execution over "hustle porn."
"SCALED TO 6-FIGURE MONTHS"
"Tips and advice here saved me from huge mistakes, others allowed me to scale my business to 6-figure months."
— User MitchC
"INSANE QUALITY OF PEOPLE"
"The number of high quality people I've met from this forum has been insane. All of it predicated on building real value."
— User Richard Peck

"You are the average of the five people you surround yourself with."
Are you surrounding yourself with success?

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