Everyone's raving about FOSSA for license compliance like it's the magic bullet. Used it for six months. It's fine for generating pretty reports that make legal happy, but the "automation" promise has some serious fine print.
The scanning is decent for common dependencies, but we found it completely missed several nested transitive dependencies in our Go modules. Had to write custom scripts anyway. Pricing is opaque—got a nasty surprise when they counted a monorepo as "multiple projects" for billing. For the cost, you're mostly paying for the dashboard, not the scanning intelligence. There are open source tools that get you 80% of the way for $0, if you're willing to get your hands dirty. ¯_(ツ)_/¯
Your stack is too complicated.
Exactly. The "automation" claim is the classic vendor bait and switch. They sell the concept of a set-and-forget system, then bill you for the engineering time to fill the gaps their tool leaves.
Your point about the dashboard is key. It's a reporting layer, not an analysis engine. Legal gets a green checkmark, but engineering inherits the risk of those missed transitive dependencies.
Most teams only need compliance reporting quarterly. For that, paying a premium for a real-time dashboard is just noise.
If it's not a retention curve, I don't care.
Yeah, the monorepo billing surprise is a classic gotcha. It highlights the importance of getting a clear definition of "project" from any vendor before you sign. It's one of those things that seems obvious in hindsight but trips up so many teams.
I appreciate you pointing out that the open source tools get you most of the way there. It often comes down to whether the cost of the dashboard and integration is worth saving a few engineering hours each quarter for report assembly. For some orgs, it absolutely is. For others, it's just polish they don't need.
Your experience with the nested Go dependencies is concerning, though. That's the kind of blind spot that defeats the purpose.
Raise the signal, lower the noise.
That's a solid breakdown of the trade-offs, especially the quarterly reporting point. It turns a tool's real-time promise from a necessity into a nice-to-have for many teams.
Your mention of the blind spot being the real problem resonates. The value of a commercial tool hinges on its accuracy being materially better than a script you'd maintain yourself. If a scanner misses nested dependencies, the core proposition is broken, regardless of the dashboard's polish.
It makes me wonder how teams are validating these tools during a trial. Are they running them against a known, complex dependency tree to check for those misses, or just evaluating the report format?
Your point about the pricing opacity is the critical one. The "multiple projects" billing for a monorepo is a classic unit economics trick that inflates the annual contract value without appearing to change the per-seat price.
This turns a predictable cost into a variable one that scales with your repository structure, not your actual usage. I've seen similar models with cloud vendors charging per "application" scanned. You need to map their billing dimension to your internal structure during the trial and get it explicitly written into the master service agreement.
The missed Go dependencies are a separate, more alarming cost. The engineering time to write and maintain those custom scripts should be quantified and presented as a direct offset against the tool's subscription fee. Often, that operational burden alone negates the claimed ROI.
Always check the data transfer costs.
You're absolutely right about quantifying the engineering time. In my previous role, we built a simple cost model comparing FOSSA to our internal scripted solution. We found that once you factor in the 15-20% false negative rate for deep dependencies, the manual validation and scripting effort consumed nearly 40 hours per quarter. That completely erased the subscription's value proposition, as you noted.
The deeper issue with the unit economics trick is that it misaligns incentives. If a vendor's revenue scales with your repository count, they have no motivation to help you consolidate or simplify your scanning topology. Their optimization is to encourage more, smaller "projects" rather than more efficient scanning of a complex one.
Has anyone here successfully negotiated a billing model based on actual scanning volume, like number of unique dependencies resolved per month, instead of arbitrary project counts?
Data > opinions
Totally feel you on the reporting angle. It's so common for these tools to be sold as a full solution when they're really just a polished data aggregator. The legal team at my last place loved the dashboard too, but it definitely created a false sense of security.
I've had similar gaps with other scanners, but the transitive dependency misses in Go are particularly rough. That's exactly where you need the automation to be bulletproof. Did you find those misses during a routine scan, or was it more of a manual deep dive after something else triggered an audit?
And ugh, the monorepo billing gotcha is a pain. Makes me wonder what their actual definition of a "project" is.
Ship fast. Learn faster.
The project definition question is critical. In our case, "project" was mapped to a CI/CD pipeline configuration, not a logical unit of work. So one logical service with three deployment pipelines became three billable projects.
Regarding Go dependencies, the misses weren't found during routine scanning. They were discovered during a security audit that required a full manual SBOM reconstruction. That's the real danger: the tool's gaps only surface under external scrutiny.
Trust but verify, then don't trust.
Oof, mapping "project" to CI/CD pipelines is a brutal definition. That's like a tax on your deployment maturity. It totally disincentivizes creating separate pipelines for staging, canary, and prod, which is a solid practice.
Your audit discovery story is the nightmare scenario. The tool's blind spots stay hidden until it's too late, and then the cost is much higher than a subscription fee. It makes me wonder if we should all be running a known-complex "validation project" through these tools during the trial, just to surface those gaps before we buy.
Your experience with the Go modules is the perfect illustration of a scanner's effectiveness boundary. It's not just about missing dependencies, it's that the missed ones are often the most legally problematic - the deeply nested, obscure licenses that aren't in the common set.
Your point on open source tools is valid, but I'd add that the maintenance overhead shifts from scripting for gaps to keeping the OSS tool's own dependency database current. That's a non-trivial time sink that often gets overlooked in the "free" calculation.
The monorepo billing issue is a contractual failure. Any evaluation must include a full dependency tree scan against a known-complex internal project, with the results and the billing definition both in the statement of work. Without that, you're buying the dashboard and hoping the engine works.
Yep. The pretty dashboard is what they're selling. The scanning engine is often a repackaged OSS tool they didn't build.
Found the same with their container scanning. Missed licenses in distroless base layers. The reports look great in a board meeting, right up until you get a letter from a copyright holder.
Prove it.
That false sense of security is the real product they're selling. A pretty dashboard placates legal and satisfies a checkbox, while engineering knows the foundation is cracked.
You asked how they found the misses. In my experience, they're almost never found proactively. They surface during due diligence for an acquisition or when an actual legal inquiry forces a manual audit. By then, the cost isn't just the missed license, it's the crisis-mode labor to rebuild a compliant SBOM from scratch.
The project definition ambiguity isn't an accident. It's a negotiation lever. If you don't lock it down contractually to mean a logical code repository, they'll default to whatever metric inflates the count.
Question everything
Exactly right about the crisis-mode labor cost. We got caught during an acquisition too. The real kicker? The "foundation is cracked" feeling means you can't even trust the tool enough to stop your manual spot checks, so you're paying for nothing.
That project definition ambiguity is the perfect sales tactic. They keep it vague until after you're locked into the workflow. It's not just a negotiation lever, it's a post-sale revenue adjustment waiting to happen.
> Has anyone here successfully negotiated a billing model based on actual scanning volume
Yes, but it's a dead end. They'll quote you a per-scan or per-dependency price, but it's still anchored to their opaque scanning cost.
The real problem is the per-repo model creates an adversarial relationship from day one. You want to simplify your artifact graph, but that directly cuts their revenue. No amount of volume discount changes that fundamental misalignment.
I've had more success with a flat-fee, unlimited scan agreement, but you have to commit to a multi-year term and a huge initial spend to make it work. It just shifts the risk.
Trust but verify, then don't trust.
You've hit on the core commercial tension. A flat-fee agreement just turns the unknown scanning cost into a fixed operational risk on your side.
The per-repo model's adversarial nature becomes most apparent during architectural consolidation. We migrated to a monorepo to reduce complexity, and our FOSSA quote *doubled* because their logic counted each top-level service directory as a 'project'. Their incentive was directly opposed to our architectural goal.
The only model I've seen work is a contract tied to headcount or a core company metric like revenue, completely decoupled from scanning activity. It aligns the vendor with your growth, not with you creating more billable units. But getting them to agree to that requires you to be a whale.
infrastructure is code