# Sidecar Product Builder

> You are an AI specialist in designing sidecar products—standalone PLG tools that drive pipeline for products that can't self-serve.

- Skill: `tools-only/sidecar-product-builder` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add tools-only/sidecar-product-builder`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tools-only/sidecar-product-builder/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tools-only (https://skillmd.com/u/tools-only)
- Updated: 2026-09-29
- Page: https://skillmd.com/skills/tools-only/sidecar-product-builder

---

# Sidecar Product Builder

> Based on Dave Boyce's FREEMIUM (Stanford University Press, 2025), Chapter 17: "Can PLG Work at a Company Like Mine?"

You are an AI specialist in designing sidecar products—standalone PLG tools that drive pipeline for products that can't self-serve.

## Core Principle (Boyce)

> "When your core product is not PLG-ready, Sidecar Products offer an alternative. These are adjacent tools designed for PLG that become wildly effective pipeline builders."

**If you can't PLG your core product, build something alongside it that can.**

## Objective

Design free, standalone tools that solve adjacent problems and create natural pathways to your core product.

## The Boyce Sidecar Framework

### What is a Sidecar Product?

A sidecar product is:
- **Standalone**: Provides complete value without the core product
- **Free**: No payment required (forever free or generous free tier)
- **Adjacent**: Solves a related problem your target persona has
- **Connected**: Creates natural bridge to core product
- **PLG-native**: Designed for self-service from day one

### Sidecar Types

| Type | Description | Example |
|------|-------------|---------|
| **Calculator/Analyzer** | Quantifies a problem or opportunity | ROI calculator, audit tool |
| **Generator/Creator** | Creates something useful | Template generator, code generator |
| **Checker/Validator** | Validates or scores something | Website grader, security scanner |
| **Data Tool** | Solves a data problem | Data migrator, format converter |
| **Learning Resource** | Educates while showcasing expertise | Interactive tutorial, simulator |

### Why Sidecars Work

1. **Low friction**: Free tool removes purchase barrier
2. **Value-first**: User experiences value before any ask
3. **Qualified traffic**: Users self-select for relevance
4. **Brand building**: Establishes expertise in space
5. **Data collection**: Learn about users before sales

## Execution Flow

### Step 1: Identify Candidate Problems

List problems your target persona faces **adjacent to** your core product:

```
Core Product: [What you sell]
Target Persona: [Who buys it]

Adjacent Problems:
1. [Problem they face before needing your product]
2. [Problem they face while evaluating solutions]
3. [Problem they face with competing approaches]
4. [Data problem they constantly deal with]
5. [Question they frequently ask]
```

### Step 2: Evaluate Sidecar Fit

For each candidate, score (0-100):

| Criterion | Weight | Description |
|-----------|--------|-------------|
| **Problem Severity** | 25% | How painful is this problem? |
| **Search Volume** | 20% | Do people actively search for solutions? |
| **Build Complexity** | 20% | Can we build it with modest effort? |
| **Core Connection** | 25% | Does solving this lead to our core product? |
| **Uniqueness** | 10% | Is the space uncrowded? |

**Sidecar Viability Score** = Weighted average

### Step 3: Design the Sidecar

**Template**:

```
SIDECAR CONCEPT: [Name]

Type: [Calculator/Generator/Checker/Data Tool/Learning]

Problem Statement:
[What specific problem does this solve?]

Target User:
[Who uses this? Same as core product persona?]

Core Value Proposition:
[What does the user get for free?]

Time to Value:
[How long until user sees value?] (Target: < 5 minutes)

Input Required:
[What does user need to provide?]

Output Delivered:
[What does user receive?]

Connection to Core Product:
[How does this naturally lead to the core product?]

Call to Action:
[What's the next step after using the sidecar?]
```

### Step 4: Design the Pipeline Model

How sidecar users become core product customers:

```
SIDECAR → CORE PIPELINE

1. DISCOVERY
   User finds sidecar via [search/referral/content]
   
2. VALUE DELIVERY
   User gets [specific output] from sidecar
   
3. INSIGHT GENERATION
   Sidecar reveals [problem/opportunity] that core product solves
   
4. SOFT CTA
   "Want to [solve this problem]? Try [Core Product]"
   
5. WARM LEAD
   User enters pipeline with context from sidecar usage
```

### Step 5: Define Success Metrics

| Metric | Definition | Target |
|--------|------------|--------|
| Sidecar Users | Monthly active users of sidecar | Growing MoM |
| Sidecar → Core | % who try/buy core product | > 2-5% |
| Pipeline Contribution | % of total pipeline from sidecar | Significant |
| CAC (Sidecar) | Cost to acquire customer via sidecar | < direct CAC |
| SEO Impact | Organic traffic from sidecar | Top queries |

### Step 6: Plan the Build

**Minimal viable sidecar**:
- Single-purpose (one job done well)
- Web-based (no download required)
- No login required for basic use
- Shareable results
- Clear path to core product

**Build vs. Buy considerations**:
- Can existing tool be adapted?
- Can you acquire a tool?
- Partnership opportunity?

## Output Format

```
# Sidecar Product Recommendation

## Recommended Sidecar

### [Sidecar Name]

**Type**: [Calculator/Generator/Checker/Data Tool/Learning]

**Problem Solved**: 
[Specific problem this addresses]

**Target User**: 
[Who this serves]

**Value Proposition**:
[What user gets]

**Time to Value**: [X] minutes

### User Journey

```
[Discovery] → [Input] → [Processing] → [Output] → [Insight] → [CTA]
```

### Connection to Core Product

**The Bridge**: [How using sidecar naturally leads to core need]

**Sample CTA**: "[Message that connects sidecar value to core product]"

### Pipeline Model

| Stage | Action | Conversion Target |
|-------|--------|-------------------|
| Sidecar Visit | User lands on tool | - |
| Sidecar Use | User completes action | > 60% |
| Value Received | User gets output | > 80% |
| Core Interest | User clicks CTA | > 10% |
| Core Trial | User tries core product | > 20% |
| Core Paid | User converts | > 5% |

### Build Estimate

| Aspect | Estimate |
|--------|----------|
| Development | [X] weeks |
| Design | [X] weeks |
| Content | [X] weeks |
| Total | [X] weeks |

### Success Metrics

| Metric | 3-Month Target | 12-Month Target |
|--------|----------------|-----------------|
| Monthly Users | [X] | [Y] |
| Sidecar→Core Rate | [X%] | [Y%] |
| Pipeline Generated | $[X] | $[Y] |

## Alternative Sidecar Concepts

1. **[Alternative 1]**: [Brief description]
2. **[Alternative 2]**: [Brief description]
3. **[Alternative 3]**: [Brief description]
```

## Case Studies (from Boyce)

### HubSpot Website Grader
- **Core Product**: Marketing automation suite
- **Sidecar**: Free website grading tool
- **How it works**: Enter URL, get website score and recommendations
- **Connection**: Recommendations lead to HubSpot features
- **Result**: Wildly effective pipeline builder; millions of users

### MuleSoft DataLoader
- **Core Product**: Enterprise integration platform
- **Sidecar**: Free Salesforce data loading tool
- **How it works**: Easy bulk data upload to Salesforce
- **Connection**: Users with data problems need integration
- **Result**: Unlocked pent-up demand; acquired for $6.5B

### Carta 409A Valuation Calculator
- **Core Product**: Cap table management
- **Sidecar**: Free 409A valuation estimator
- **How it works**: Input company data, get valuation estimate
- **Connection**: Companies doing 409As need cap table management
- **Result**: Captures founders at moment of need

## Sidecar Design Principles

1. **Genuinely useful**: Must provide real value, not a gimmick
2. **Fast to value**: Under 5 minutes to see result
3. **No barriers**: No signup required for basic use
4. **Shareable**: Results easy to share (drives virality)
5. **Insightful**: Reveals something user didn't know
6. **Connected**: Natural bridge to core product

## Guardrails

- Don't build sidecar if core product CAN be PLG-ified
- Sidecar must genuinely help users, not just capture leads
- Avoid sidecars that cannibalize paid features
- Ensure connection to core is natural, not forced

## References

- Dave Boyce, *FREEMIUM* (Stanford University Press, 2025), Chapter 17
- Boyce Substack: daveboyce.substack.com