SECTION 01
The 5 Legal Items Every Solo App Developer Must Cover — and When
Legal compliance for indie projects doesn't mean tackling everything at once. The key is identifying which risks are highest at your current phase and addressing them in order.
Having built over 40 services and gone through acquisitions, the lesson that stands out is this: legal gaps surface at the worst possible moments — right when you start charging or enter M&A negotiations. Getting ahead of them is far cheaper than reacting after the fact.
The five essential legal items for indie developers are:
- Terms of Service — Define your liability boundaries and prohibited uses
- Privacy Policy — Disclose how you handle user data
- Commercial Transaction Disclosures — Required by law once you accept payments
- Store Policy Compliance — Meet App Store and Google Play review requirements
- External API Terms Review — Verify commercial use is permitted before building on third-party APIs
In terms of phasing, MVP stage only requires a basic terms of service and privacy policy. Before launching paid features, add commercial transaction disclosures and ensure store policy compliance. As your user base grows, refine your privacy policy to match actual data practices.
If you ever consider selling your product, all legal documents need to be current and accurate. Keeping this phased approach in mind helps you allocate time to the right priorities at each stage.
SECTION 02
Terms of Service: Why Copy-Paste Doesn't Work
When it's time to create terms of service, many indie developers copy them wholesale from another product. This approach carries real legal risk.
First, another company's terms of service may be protected as copyrighted work, making unauthorized copying a potential infringement. Worse, if your terms don't match your actual service, your disclaimer clauses won't hold up when disputes arise.
Your terms of service should cover at least these three areas:
- Scope of liability — Clearly state the limits of your responsibility as the service provider
- Prohibited conduct — List specific actions users are not allowed to take
- Cancellation and account deletion policy — Explain what happens to user data upon termination
These three items need to be written to match your specific service. Whether you have payments, user-to-user interactions, or content uploads fundamentally changes what your terms need to address.
Using templates as a starting point is fine. But adapting them to reflect your service's actual functionality is the non-negotiable step. Skip this, and your terms become a decoration that offers no legal protection when you need it most.
SECTION 03
Privacy Policy: When "Just Having One" Isn't Enough
Privacy policies are the classic "set it and forget it" document in indie development. But as your features evolve, so does the data you handle. A one-time effort isn't sufficient.
Services with user-generated content or messaging features face a much higher bar for privacy compliance. Through trial and error, it became clear that the more community or matching features you add, the more complex your data obligations become.
Your privacy policy should explicitly cover these core areas:
- What data you collect — Email addresses, posted content, access logs, etc.
- How you use the data — Service improvement, notifications, analytics
- Third-party sharing — Whether data goes to analytics tools, ad networks, or other services
- Deletion request handling — The process for users who want their data removed
The biggest risk with template-based policies is the gap between what's written and what actually happens. If you've integrated analytics tools but haven't mentioned them in your policy, that's a compliance violation waiting to happen.
Privacy regulations are continuously updated, so reviewing your policy at least annually — and whenever you ship a major feature — is a practical habit. Simply asking "what data does this feature touch?" before each release prevents most oversights.
SECTION 04
Commercial Transaction Disclosures: Obligations Start the Moment You Charge
In Japan, the Act on Specified Commercial Transactions requires mandatory disclosures the moment you implement paid features. "My user base is still small" is not an exemption. This is a hard line to clear before activating any payment flow.
Required disclosures include your legal name, address, contact information, and cancellation procedures. For sole proprietors, this means publishing your home address — which is a significant barrier for many indie developers.
Practical workarounds for the address disclosure requirement include:
- Virtual office services — Contract an address-lending service and use that address for disclosure
- Coworking or rental office spaces — Secure a legitimate business address
- Incorporating a company — Register a legal entity and use its registered address
The right timing for incorporation is when paying users are growing and monthly revenue has stabilized. Operating under a personal name means all liability falls on you personally. A corporate entity provides a degree of separation. Pairing incorporation with a disclosure review is the logical sequence.
One frequently missed item is clearly stating your cancellation procedure. Vague language like "contact us to cancel" doesn't meet the standard. Specific steps need to be documented.
SECTION 05
Store Policies Carry the Same Weight as Law
App Store and Google Play guidelines are a separate layer of rules that bind indie developers independently of civil law. Violating them means review rejection or removal — your product never reaches users.
When implementing subscription-based payments, platform requirements become extremely granular. Refund policy display, cancellation flow design, and trial period presentation each have specific standards to meet.
Common rejection triggers related to store policies include:
- Subscription cancellation must be clearly accessible within the app — A link in settings, for example
- Post-trial billing timing must be transparently communicated — Users should never feel surprised by a charge
- Refund policies must align with the platform's own refund flow — No contradictions between your stated policy and what the store actually does
Apple's guidelines in particular can change without warning, causing previously approved submissions to fail on the next review. Staying current with guideline updates is an ongoing responsibility, not a one-time task.
In practice, store policy compliance should be prioritized before legal compliance in many cases. Even if your product is legally sound, it can't launch if it doesn't pass review. For any app with payments, reading the latest platform guidelines before writing code is the safest approach.
SECTION 06
The Risk of Not Reading External API Terms
Indie developers frequently build products by combining APIs, but almost nobody reads the full terms of service for those APIs. Hidden within them can be clauses like "no commercial use" or "prohibited for competing services."
The worst-case scenario is losing API access after your revenue is already flowing. If an API you depend on shuts you off, every feature built on it needs to be rebuilt from scratch. Your revenue stream vanishes overnight.
When reviewing external API terms, focus on these four items:
- Commercial use permission — Free and paid tiers may have different terms
- Non-compete clauses — Whether building a service that competes with the API provider is prohibited
- Rate limits and usage caps — Whether the API can scale with your growing user base
- Change notification policy — Whether you'll be warned before terms are updated
At the service design stage, reading the terms for every API you plan to depend on is a non-negotiable step. You don't need to study the entire document — just confirming the four points above prevents the most dangerous oversights.
Checking whether alternative APIs exist at the design stage also serves as a risk hedge. Full dependency on a single API is a structural vulnerability — both technically and legally.
SECTION 07
How Legal Gaps Surface During an M&A Exit
When selling a service, buyers scrutinize your terms of service, privacy policy, and data handling practices in detail. The mindset that "it's just an indie project, close enough is fine" doesn't survive an acquisition negotiation.
Having gone through a service acquisition, the clearest takeaway is that starting legal cleanup when you decide to sell is already too late. Buyers evaluate the current legal state of your service, and hasty patches are transparent.
Buyers typically focus on these specific areas:
- Whether your terms of service match your service's actual functionality
- Whether data collection, storage, and deletion policies are documented
- Whether contracts with third-party services are organized
- Whether intellectual property is clean — app name, logo, OSS licenses
The honest reflection is that legal documents should be maintained from the moment you're handling user data on an ongoing basis — not prepared retroactively for a sale. Even without acquisition plans, proper legal documentation is a direct signal of service credibility.
Maintaining a "ready to sell at any time" posture expands your future options. Beyond acquisitions, business partnerships and funding discussions will also examine how well your legal foundation holds up.
SECTION 08
Overlooked Filing Obligations and IP Risks
One of the least-known legal requirements for indie developers is that certain features trigger mandatory filing obligations. User-to-user messaging and closed chat functionality are common triggers.
Many indie developers are unaware these obligations exist, continuing to operate without required filings. Building a habit of asking "does this feature require any regulatory filings?" each time you add functionality is essential.
On the intellectual property front, launching without checking your app name and logo carries real risk:
- Trademark search for your app name — Confirm no existing trademark registration conflicts
- Logo similarity check — Ensure your design won't be confused with existing marks
- OSS license compliance — Verify you're meeting all license conditions for open-source code you use
OSS license violations are frequently discovered through external reports after launch. GPL-licensed code in particular can create source code disclosure obligations that, if unknowingly violated, create significant retroactive compliance work.
Running a basic trademark search and OSS license audit before launch prevents the majority of post-launch IP issues. Perfection isn't required, but the minimum due diligence is time well invested.
SECTION 09
A Practical Legal Action Plan for Solo App Developers
With all five items covered, here's the practical sequence for taking action. You don't need to do everything at once — a phased approach aligned with your development stage is the realistic path.
Before MVP launch, complete these minimum actions:
- Draft basic terms of service (liability scope, prohibited conduct, cancellation policy)
- Create a first version of your privacy policy (at minimum, list data collected and its purpose)
- Run a basic trademark search on your app name
- Check commercial use permissions in your external API terms
Before implementing payments, add these steps:
- Prepare commercial transaction disclosures (decide how to handle address publication)
- Review store guidelines and ensure payment screen display requirements are met
- Define your cancellation flow and reflect it in both your terms and disclosures
As your user base grows, shift focus to privacy policy refinement and incorporation planning. When you add user-generated content or messaging features, update your data handling policies. Once revenue stabilizes, consider incorporation alongside a disclosure review.
Legal compliance isn't a burden — it's an investment in your service's credibility. Start minimal, build incrementally with each phase, and you'll have a foundation that holds up in any situation.
