Open Source Is a Business Strategy, Not a Cost Save

Open source is a business strategy because it changes who controls the software, the data, and the exit, not because it removes a licence fee. The saving on licence cost is real but usually smaller than people expect once you count integration and support. The bigger win is structural: you can audit the code, you can leave the vendor without losing your data, and you can hire from a global pool of people who already know the stack. That control is worth paying for, and treating it as "free software" undersells what it actually does for a business.

The pitch nobody needed but everyone repeats

Every open source conversation starts with "it's free" and stops there. That framing is why so many companies adopt open source for the wrong reason and then feel burned when the total cost of ownership turns out to be non-zero.

The licence for ERPNext, PostgreSQL, or a self-hosted analytics tool costs nothing. Running it well does not. Someone has to size the server, apply security patches, manage upgrades, and answer the phone when a report breaks at 11pm on a closing day. That someone is either your team or a partner you pay. The cost did not disappear; it moved from a subscription line to a headcount or services line.

So the real question is not "is it free" but "what does the freedom buy us, and is that worth the operational cost." Framed that way, open source becomes a genuine strategic decision rather than a procurement shortcut.

What open source actually buys a business

Exit rights. With proprietary SaaS, your data lives in someone else's schema, and leaving means a painful export, or no export at all for the fields that matter. With open source, you can self-host, migrate, or fork. You are never more than an infrastructure decision away from independence. For a business planning to operate for a decade, that optionality has real value even if it is never exercised.

Auditability. You can read the code that touches your customer data, your financial records, or your compliance-sensitive workflows. For regulated industries, or simply for a founder who wants to know exactly how a discount is calculated in the billing engine, that visibility is worth more than a vendor's word.

No vendor lock-in on your own data. This is different from exit rights: it means during normal operation, your data stays in formats you control (a Postgres database you can query directly, a file store you can back up yourself) rather than being reachable only through a vendor's API with its own rate limits and pricing.

Talent leverage. A developer who has worked with Frappe, Django, or Postgres can be productive on your open source ERP or SaaS stack within days. A developer who has to learn a closed, proprietary platform's quirks takes weeks, and you cannot hire from a pool of "people who already know this system" because there is no public pool. This matters more as teams scale past the founding engineers.

Community-vetted security. Widely used open source projects get scrutinised by more eyes than most internal proprietary codebases ever will. This is not automatic protection, but a mature project with an active CVE process is often more transparent about its security posture than a vendor who discloses breaches on their own schedule.

What it costs, honestly

Integration work. Open source components rarely arrive pre-wired to each other. Someone has to connect your ERP to your payment gateway, your auth system to your CRM, and keep those integrations working across version upgrades.

Upgrade discipline. Proprietary SaaS upgrades happen to you, silently, on the vendor's schedule. Open source upgrades happen when you run them, which means they can also not happen, for years, until a security issue forces the question. This is the single most common failure mode we see: a business runs a three-year-old fork of an open source ERP with no plan to ever upgrade it again.

Support ownership. When something breaks, there is no 24/7 vendor support line unless you pay a partner for one. You are choosing between building that capability in-house or buying it as a service, and either way it is a real, ongoing line item.

Licence literacy, in plain English

If you plan to build and eventually sell a SaaS product, the licences of everything you depend on matter more than most founders realise.

• MIT and Apache 2.0 are permissive. You can use, modify, and even sell software built on them without releasing your own source code. This is the safest choice for components you plan to embed in a proprietary product.
• AGPL is a copyleft licence with teeth for hosted software. If you modify AGPL code and run it as a network service (which describes almost every SaaS), you are generally required to release your modifications. This is fine if your product is itself open source; it can be a serious legal risk if you planned to keep a fork proprietary and sell it as a black box.
• Source-available licences (like BSL or Elastic's licence) let you read and often self-host the code but restrict specific commercial uses, typically running it as a competing hosted service. These are not OSI-approved open source, and vendors use them deliberately to get community goodwill while protecting their own hosting revenue.

Before you build a SaaS product on any open source dependency, know which bucket it falls into. A licence audit before a fundraise or acquisition is standard due diligence; doing it before you write the code is cheaper.

Business models that work: open-core and support

Two models consistently work for companies building on open source:

Open-core. The base product is free and open, hosted or self-hosted. The company sells enterprise features (SSO, advanced permissions, audit trails), a managed cloud version, or higher usage tiers. GitLab and Odoo both operate this way, and Frappe/ERPNext follows a similar pattern with Frappe Cloud.

Support and implementation. The software is entirely free, and the business is built on customisation, hosting, training, and support contracts. This is how most ERP implementation partners, including the way SaaSFarers approaches ERPNext work, actually generate revenue: not from the licence, but from doing the integration, migration, and ongoing support work well.

Neither model requires you to be the original author of the open source project. You can build a durable services or open-core business around software you did not write, as long as you genuinely add value on top of it.

Open Journey: building in the open with clients

SaaSFarers' tagline is "Open Source and Open Journey," and the second half matters as much as the first. Open Journey means running the client relationship the way you would run an open source project: visible backlogs the client can see at any time, shared repositories rather than a black-box handoff at the end, and decisions documented as they are made rather than reconstructed from memory when something goes wrong six months later.

This is not altruism. A client who can see the backlog does not need to ask for status updates. A shared repo means there is no "what did we actually agree to build" argument at delivery. Documented decisions mean a new team member, on either side, can get up to speed by reading rather than by interrogating whoever remembers the context. It is simply a better way to run a project, borrowed from a community that had to solve the same trust problem at a much larger scale.

Practically, this looks like a project board the client has real access to, pull requests the client's own developers can review if they have any, and a written record of "we chose X over Y because Z" for every meaningful architectural fork. Read more about how this shows up in the actual delivery model on the open source page and in the about section.

Get this right before you commit

Open source is a strategic lever, not a discount. Used well, it buys you exit rights, auditability, and a wider talent pool. Used carelessly, it buys you a support burden nobody budgeted for. The businesses that get the most out of it are the ones that pick their licences deliberately, plan for upgrades before they become emergencies, and treat "open" as a working method with clients, not just a checkbox on the tech stack.

Where SaaSFarers fits in

If you are weighing whether to build on open source, or you have inherited an open source system nobody is maintaining properly, that is exactly the kind of problem worth talking through before it becomes expensive. Our services are built around exactly this model of transparent, documented delivery, and if you are earlier in your career and want to learn how these decisions get made on real client work, SaaSFarers Academy puts you on live projects rather than tutorials.