Category map
Contract tooling for SaaS platforms.
There are five realistic ways to add contracts to a software product: a signature API, a document generation API, a proposal tool, a CLM, or building an integration yourself. Which one fits depends on who owns the template and whether you are the sender or the platform the sender uses. Most products need one of the first four. This page is a map of the categories, the products in each, and how to tell which situation you are in.
We make one of these things, and it is deliberately last on the list. Three of the six situations below are more common than ours, and each section says plainly who should choose it. A comparison written by a vendor is only worth reading if it is useful when the answer is somebody else.
The categories
What each is for, and what it is not.
Six ways to solve this, and who each is for.
Signature APIs
A signature API collects a legally binding signature on a document you have already produced.
DocuSign eSignature, Dropbox Sign, BoldSign, SignWell, Documenso.
Choose it when: Your application already outputs a finished PDF and the only missing step is getting it signed. This is the largest and most mature category, and for a great many products it is the whole answer.
Wrong fit when: Producing the document is the hard part. A signature API starts after that problem is solved, so if your users are assembling agreements by hand before uploading them, this leaves the actual work untouched.
Document generation APIs
A document generation API merges structured data into a template somebody has already configured with placeholders.
Anvil, Formstack Documents, Docupilot, PDFMonkey, Carbone.
Choose it when: You own the template. One document, or a handful, that you control and can set up once: an invoice, a certificate, a standard order form.
Wrong fit when: Every one of your customers has a different document. Someone has to build each template by placing fields on it, and that cost is fine amortised over one enterprise agreement and prohibitive across a thousand small businesses who each brought their own contract.
Proposal and CPQ tools
Proposal tools help a business build, send and track a sales document, usually with pricing tables and its own templates.
PandaDoc, Proposify, Better Proposals, Qwilr.
Choose it when: You are the business sending proposals, and you want a good tool for it. These are polished, well-designed products with real template libraries.
Wrong fit when: You are a platform, not the sender. These are sold direct to the business and log in separately, so your users would leave your product to use one, and you would not own the relationship or the workflow.
Contract lifecycle management
CLM manages agreements after they exist: a searchable repository, obligations, renewals, approvals and reporting across a portfolio.
Ironclad, Juro, SpotDraft, LinkSquares, DocuSign CLM.
Choose it when: Volume and legal oversight are the problem. A legal or procurement team needs to find every contract with a particular clause, track what renews next quarter, and enforce an approval chain.
Wrong fit when: You need documents produced inside somebody else's product. CLM is a destination a legal team logs into, priced and shaped for that, and embedding it inside a vertical SaaS product for thousands of small businesses is not what it is for.
Build it yourself
Most platforms that need this build an integration rather than buying a product, usually wiring a signature API to their own data.
Not a product category. Jobber's DocuSign integration is a well-documented public example.
Choose it when: Your document set is small and stable, your users will accept a vendor's branding on the email, and merge fields express everything your agreements need. Then this is the cheapest correct answer and you should take it.
Wrong fit when: The work is larger than it looks once real documents arrive: filling the customer's own DOCX without wrecking its formatting, payment schedules with a variable number of rows, clauses that should disappear conditionally, decimal-safe money arithmetic, and reproducing a signed contract years later.
Embedded contract infrastructure
Embedded contract infrastructure lets a software platform give its users contract generation and signing inside the platform's own product, using the contracts those users already have.
Conovo. This is a young category with few products in it.
Choose it when: You are a vertical SaaS platform, your users each have their own lawyer-approved agreement, and the data those agreements need is already in your database. You want to switch this on for your whole base without any of them signing up for anything.
Wrong fit when: You are the business rather than the platform: buy a proposal tool. You need agreement management: buy CLM. You already have the finished PDF: buy a signature API. Those are three of the five situations above, and they are more common than this one.
Deciding
Five questions, in order of how much they resolve.
How to tell which situation you are in.
Do you already have the finished document?
If yes, you need a signature API and nothing more. This is the single most useful question and it resolves most cases immediately.
Who owns the template, you or your customer?
If you own it and it rarely changes, a document generation API is enough. If each of your customers brings their own agreement, template configuration becomes a per-customer cost and that is the thing that does not scale.
Are you the sender, or the platform the sender uses?
Proposal tools and CLM are bought by the business doing the signing. If you are the software they run their business on, those are the wrong shape however good the product is.
Does the document need logic, or only values?
Substituting a name and a date is merge fields. A clause that disappears when there is no deposit, a table that grows a row per milestone, or a figure that must be exactly a third of another to the cent, is document generation.
Whose name should be on the email to the signer?
If the answer is your customer's, check what each option puts in front of a signer before you choose it. This is often decided late and is expensive to change afterwards.
The first question resolves most cases on its own. If your application already produces the finished document, stop reading and buy a signature API.
Deeper
Where a single comparison is worth the detail.
Going further.
The comparison people ask for most is with DocuSign, because it is the default mental model for anything contract-shaped. Conovo vs DocuSign covers it in detail, including the five situations where DocuSign is the better choice.
If you are weighing an integration against buying one, build versus buy walks through the work in the order teams actually meet it. If you want the technical shape of what we make, that is the contract generation API, and embedded e-signature covers the last step of it.
Questions
What are my options for adding contracts to a SaaS product?
There are five realistic paths. A signature API (DocuSign, Dropbox Sign, BoldSign) if your product already produces the finished document. A document generation API (Anvil, Formstack Documents, Docupilot) if you own the template and it rarely changes. A proposal tool (PandaDoc, Proposify) if you are the business sending agreements rather than the platform. CLM (Ironclad, Juro, SpotDraft) if managing agreements after signing is the real problem. Or embedded contract infrastructure if your users each bring their own contract and it needs to be populated from data your platform already stores.
What is the difference between a signature API and a document generation API?
A signature API collects approval on a document that already exists. A document generation API produces that document from data. They are sequential steps rather than alternatives, and many products need both. The common mistake is buying only the signature layer and discovering that producing the correct document was the larger problem.
Do I need a CLM?
Only if managing agreements after they are signed is a real problem for you: finding every contract containing a clause, tracking renewals, enforcing approval chains across a portfolio. CLM is sold to legal and procurement teams and is a destination they log into. If your problem is producing agreements inside another product, it is the wrong category regardless of how good the tool is.
Should I just build it myself?
Often, yes. If your document set is small and stable, your users accept a vendor's branding, and merge fields express everything your agreements need, an integration between your database and a signature API is the cheapest correct answer. The costs that change the calculation are filling a customer's own DOCX without breaking its formatting, conditional clauses, variable-length tables, decimal-safe arithmetic, and reproducing a signed document years later.
What is embedded contract generation?
Embedded contract generation is the process of producing a finished contract from data inside a software platform, without the user leaving that platform. It differs from document generation in that the template belongs to the platform's customer rather than the platform, so the setup cost per customer has to be near zero for it to work across a large base.
If the last category is the one you recognised.
Upload a contract one of your customers already sends and watch it find the variable fields, bind them to a record, and generate a signed document. No signup, and nothing is emailed to anyone.