Based on the bestselling book by Nishat Husain

Become funding ready
and achieve product
market fit with a system

Stop guessing. Start building your Growth Engine.

Two operating systems — one for finding PMF, one for scaling it. Built on 122 real-world case studies and 13 years of SaaS growth expertise.

Get Growth Engine OS — ₹9,999 → Start with PMF OS — ₹999 Get the Bundle — ₹10,499 →
PMF OS
Find Product-Market Fit
₹999
Growth Engine OS
Build Your Growth Engine
₹9,999
★★★★★  Trusted by 500+ SaaS founders & growth leaders  ·  Lifetime access
The hard truth

Most startups don't fail because of bad products.
They fail because of missing systems.

Over 13 years, Nishat Husain has watched the same pattern repeat — companies with great products, talented teams, and genuine customer demand still struggle with sustainable growth. The reason is always the same: tactics without a system.

What founders usually do

Talk to a few users and assume they understand the problem. Build features based on what sounds good in meetings. Check MRR instead of retention. Pitch investors before the metrics tell a coherent story.

What the data-driven founders do

50+ structured interviews before building. Falsifiable hypotheses updated every week. A retention curve they watch obsessively. An aha moment they can name, measure, and engineer users toward — in under 7 days.

The difference isn't talent or timing

The founders who grow fast don't guess better. They measure better. They have a system that tells them exactly which signal to look at, what it means, and what to do next.

That's what both OS products deliver

PMF OS gets you from first customer conversation to confirmed PMF. Growth Engine OS turns that PMF into a compounding growth machine — experiments, retention, channels, analytics, and AI all in one workspace.

The founder journey

Beautiful, painful — and completely fixable.

01
Where most founders start

You shipped something. Nobody uses it twice.

You built the product, wrote the onboarding emails, pushed to production. You have users. But the retention curve keeps declining, nobody refers their friends, and every week you're not sure if you're one iteration away from PMF or twelve.

02
The treadmill

You add features. The metrics don't move.

You run sprints. You ship. You post in communities. You try paid ads. Each month the numbers are a little different but you can't tell if they're actually improving or if you're just getting lucky with a few good users while the real problem stays invisible.

03
The shift

You install the system. The engine starts running.

You know who your product is for, what their aha moment is, and what behaviour in week one predicts whether they stay for a year. Your experiment velocity doubles. Your retention curve flattens. Your investor pitch tells a story backed by data. You stop guessing. You start compounding.

A study of two founders

Which founder are you — Raj or Priya?

Raj

Building without a system
✕Interviews a handful of users once, builds based on what he heard
✕Measures MRR and sign-ups but can't explain why people churn
✕Adds features because users asked, not because data suggested them
✕Pitches investors with "strong early traction" — gets asked hard questions he can't answer
✕Wonders why founders with a worse product are raising at better terms

Priya

Running PMF OS
✓Runs 50+ structured interviews, has a pain ranking board and JTBD map
✓Tracks "very disappointed" %, retention curve shape, and aha moment reach weekly
✓Every feature is a documented hypothesis with a success metric and a kill condition
✓Walks into investor meetings with a PMF one-liner, signal convergence data, and a retention story
✓Raised her seed round in 6 weeks because the metrics told a coherent story

Both are working just as hard. Priya has PMF OS installed. That's the whole difference.

Everything you get

8 sections. One system.
Lifetime access.

Built on the frameworks of Growth Engine by Nishat Husain — Works on Notion (with Google Sheets version included).

🔍
Customer Discovery Engine
Full ICP worksheet, 50-interview tracker, exact problem and solution interview scripts, pain ranking board, and Jobs-to-be-Done map.
💡
Solution Validation
Hypothesis version log, build-measure-learn tracker, 4-question MVP scoping framework, Value Triangle audit, pricing experiment sequence.
📏
PMF Measurement System
The full 5-question PMF survey (exact wording), results log, cohort tracker, behavioural signal tracker, PMF score calculator (0–21).
🎯
Aha Moment Lab
Behaviour gap analysis, aha moment definition template, activation funnel map with drop-off tracking, time-to-value tracker.
🔁
Retention Lab
Churn interview guide and tracker, cohort retention table, habit loop builder, churn pattern analysis with experiment fix ideas.
⚖️
Pivot or Persevere Framework
8-signal trigger checklist, 4-step decision tree, 7 pivot types with when-to-use guidance, signal log, monthly review agenda.
🏃
Early Growth Playbook
Pre-PMF acquisition rules, direct outreach tracker and email template, waitlist tactics, word-of-mouth engineering playbook.
📊
Investor PMF Story
4-chapter investor narrative, monthly update template, fundraising readiness checklist (Seed + Series A), investor Q&A prep scripts.
🧭
Home Dashboard + Masterlist
5-stage PMF tracker, signal convergence dashboard, 25+ PMF masterlist checkboxes, and weekly founder routine — all in one view.
How it works

From zero to funding-ready
in 5 stages.

PMF OS is structured like a startup's journey, not a course. You run the stage you're in right now and unlock the next when you hit your signal.

1

Understand the customer

Before you validate anything, you need the sharpest possible picture of who you're building for and what they actually need. Stage 1 builds your ICP, maps their jobs-to-be-done, and gives you a ranked problem board.

ICP builder50-interview trackerPain ranking boardJTBD map
2

Validate the solution

Run a build-measure-learn loop with discipline. Stage 2 gives you the hypothesis log, the MVP scoping questions, and the Value Triangle audit that tells you whether you're building something people will actually pay for.

Hypothesis logMVP frameworkValue Triangle auditPricing tests
3

Measure the signal

Deploy the PMF survey, read the cohort curves, and calculate your PMF score. Stage 3 tells you with precision how close you are — and what you need to change to close the gap.

5-question PMF surveyCohort retention trackerPMF score 0–21Signal convergence
4

Engineer the aha moment

Find the exact behaviour that separates users who stay from users who churn. Redesign onboarding to get every user there in under 7 days. Fix the leaky bucket before you turn on the tap.

Behaviour gap analysisActivation funnelChurn interviewsHabit loops
5

Tell the investor story with data

Build your PMF narrative chapter by chapter. Walk into seed or Series A meetings with a signal convergence table, a retention story, and answers to every hard question investors ask.

PMF one-linerInvestor update templateFundraising checklistQ&A prep
500+
Founders using PMF OS
8
Core sections in the OS
25+
Templates, trackers & guides
∞
Lifetime access + updates
What founders are saying

Real founders. Real signal.

★★★★★

"I ran 40 customer interviews in my first two weeks using the discovery guide. I found out my assumed ICP was completely wrong — and pivoted before burning 3 months of runway on the wrong segment."

Aryan M.
Founder, B2B SaaS · Mumbai
★★★★★

"The aha moment lab alone was worth it. We found that users who created a second project within 3 days had 4x better retention. We rebuilt onboarding around that one insight."

Kritika S.
Growth Lead, SaaS Startup · Bangalore
★★★★★

"I used the investor PMF story section to prep for my seed pitch. The VC literally said 'your metrics narrative is the clearest I've seen from a pre-revenue team.' We closed in 5 weeks."

Rohan K.
Founder, FinTech SaaS · Delhi
★★★★★

"Went from 19% week-4 retention to 54% in two months. The cohort tracker showed me exactly where users were dropping off. I never would have found it without the structured framework."

Meera D.
Co-founder, HR Tech · Pune
★★★★★

"The pivot or persevere framework is what I needed most. It stopped me from making an emotional decision and showed me the signals were actually pointing to a segment pivot, not a product pivot."

Aditya V.
Founder, EdTech SaaS · Chennai
★★★★★

"I've tried three different OS tools for my startup over the past year. This is the only one I actually use every week. It doesn't feel like a template — it feels like a system that runs itself."

Priyanka R.
Solo Founder, B2B SaaS · Hyderabad
Two products. One journey.

Choose the OS that matches
your current stage.

PMF OS is for founders still searching for product-market fit. Growth Engine OS is for teams ready to build a systematic, scalable growth machine. Many founders start with one and upgrade to both.

Product 1
PMF OS
The structured operating system for early-stage SaaS founders to go from zero to confirmed PMF — with the investor narrative to prove it.
₹999
One-time · Works on Notion (with Google Sheets version included)
✓Customer Discovery Engine — ICP worksheet, 50-interview tracker, exact interview scripts
✓Solution Validation — Build-Measure-Learn tracker, MVP framework, Value Triangle audit
✓PMF Measurement — 5-question PMF survey, cohort tracker, 0–21 PMF score calculator
✓Aha Moment Lab — Behaviour gap analysis, activation funnel map, time-to-value tracker
✓Retention Lab — Churn interview guide, habit loop builder, churn pattern analysis
✓Pivot or Persevere — 8-signal trigger checklist, 7 pivot types, decision tree
✓Early Growth Playbook — Pre-PMF outreach, waitlist tactics, word-of-mouth engineering
✓Investor PMF Story — 4-chapter investor narrative, fundraising checklist, Q&A prep
✓Home Dashboard + 25+ templates and trackers
Get PMF OS — ₹999 →
Most Complete
Product 2
Growth Engine OS
For full Growth Engine implementation, experiments, retention, channels, analytics & AI.
₹9,999
One-time · Works on Notion (with Google Sheets version included)
✓NSM Command Centre in PMF OS
✓NSM Command Centre — North Star dashboard, AARRR tracker, weekly review
✓Experiment Engine — ICE-scored backlog, full experiment log, design quality checklist
✓Metrics Hub — Cohort analysis, LTV by channel, retention pyramid, alert thresholds
✓Retention Centre — Aha moment framework, habit loops, lifecycle stage map, churn signals
✓Channel Scorecard — Fit matrix, CAC tracker, referral programme metrics
✓Team & Process — 3 team models, 4-stage growth process, OKRs, meeting cadence
✓Playbook Library — Value Triangle, activation playbook, PLG checklist, email lifecycle
✓AI Growth Toolkit — 10 AI prompts, churn prediction design, personalisation framework
Get Growth Engine OS — ₹9,999 →
Best Value Bundle
PMF OS + Growth Engine OS
Get both operating systems at once. Your complete founder toolkit — from finding PMF to building a full growth engine. Works on Notion (with Google Sheets version included).
₹10,998₹10,499
Save ₹499 when you buy both
Get the Bundle →
Is this for you?

Built for a specific type of SaaS founder.

This is for you if…

→You're building a SaaS product and need to find or validate PMF
→You're approaching investors and need to show PMF evidence
→Your retention is below 30% and you can't identify why
→You're running experiments but lack a framework to interpret results
→You want to grow systematically instead of reactively

This is not for you if…

✗You haven't launched yet and have zero user feedback
✗You're looking for a magic growth hack, not a system
✗You're not willing to spend 2–3 hours setting up your OS
✗You expect revenue growth in week one without doing the work
About the author
Nishat Husain
Growth Consultant · Author of Growth Engine · 13 Years in SaaS

Nishat Husain is a growth consultant with over 13 years of experience scaling SaaS brands. He has helped hundreds of startups and growth-stage companies achieve sustainable, data-driven growth.

He has comprehensive knowledge across financial forecasting, unit economics, retention strategies, and team structures. His holistic approach transforms him from an external consultant into a true extension of his clients' businesses — addressing root causes rather than surface-level symptoms.

He has spent over a decade studying what makes companies grow. Growth Engine — his debut book — represents the systematic codification of proven frameworks, distilled from real-world implementations and 122 case studies across leading SaaS brands including Slack, Dropbox, HubSpot, Warby Parker, and Glossier.

13+
Years in SaaS growth
500+
Founders & leaders trained
122
Real-world case studies
19
Chapters across 6 growth dimensions
Growth Engine by Nishat Husain
Full
7
Day
Refund

We stand behind every product.

If you purchase PMF OS or Growth Engine OS and don't find value — email us within 7 days of purchase for a complete, no-questions-asked refund. No forms, no friction, no risk.

Email: reachgrowthengine@gmail.com

Frequently asked

Questions founders ask
before buying.

What exactly is an "OS" and what formats does it come in?

Each OS (Operating System) is a fully built workspace — structured with databases, templates, trackers, and frameworks — that you can use immediately. Both PMF OS and Growth Engine OS work on Notion (with Google Sheets version included). After purchase you'll receive your Notion workspace link plus the Google Sheets version. Use whichever fits your workflow — they contain the same frameworks and content.

Do I need to have read Growth Engine first?

No. Both OS products are designed to be fully self-contained and usable without the book. Each section includes plain-English instructions, framework explanations, and worked examples. The book gives you deeper context and case studies, but the OS works as a standalone product.

Which product should I start with?

Start with PMF OS if you're pre-product-market fit, early-stage, or haven't yet identified your best-fit customer segment with confidence. Get Growth Engine OS if you already have PMF signal and are ready to build systematic acquisition, retention, and growth experiment processes. Get both if you want the complete toolkit from day one — the bundle saves ₹499.

Is there a discount for buying both?

Yes. PMF OS is ₹999 and Growth Engine OS is ₹9,999. Bought separately that's ₹10,998. The bundle is priced at ₹10,499 — saving you ₹499. You get lifetime access to both workspaces in a single purchase.

How do I get access after purchase?

After purchase you'll receive an email with your Notion workspace link plus the Google Sheets version. For Notion: click "Duplicate" to copy the workspace into your account. For Google Sheets: click "Make a copy" to save it to your Drive. Full setup takes 30–60 minutes with guided instructions inside.

What if I'm not satisfied?

We offer a 7-day full refund, no questions asked. Email reachgrowthengine@gmail.com within 7 days of purchase with your order confirmation. Refunds are processed within 3–5 business days.

Is this suitable for non-SaaS startups?

Both products are built specifically for SaaS founders. The frameworks, metrics, and templates are calibrated for SaaS unit economics, retention curves, and activation funnels. If you're building a SaaS product — even a very early one — these products are built for you.

Ready to start?

Pick your OS.
Start today.

Both products work on Notion (with Google Sheets version included). Set up in under an hour and run your first PMF session this week.

Get PMF OS — ₹999 Get Growth Engine OS — ₹9,999 Get the Bundle — ₹10,499 →

"The only job of a startup is to find PMF —
and then not loose it."

Stop guessing. Start measuring. Install the system.

Get PMF OS — ₹999 → Get Growth Engine OS — ₹9,999 → Get the Bundle — ₹10,499 →