#1★ TOP PICK
Documenso
Open-source signing with real cryptographic signatures and no envelope cap.
91
OPEN SOURCEAGPL-3.0SELF-HOSTLOCAL-FIRST
Documenso is the credible open answer: digitally signed PDFs using proper certificates, a complete audit trail, templates, and an API — self-hosted, with no per-envelope charge of any kind. AGPL-3.0, around 14k stars, and unusually transparent about how its signing works, which matters in a category where 'legally binding' is often asserted rather than explained. For a company sending straightforward agreements at volume, it removes both the seat cost and the envelope cap in one move.
Strengths
- +No envelope cap — the constraint that drives most DocuSign overage bills
- +Real cryptographic signing with a full audit trail
- +Self-hosted, so contracts never leave your infrastructure
- +Open and specific about how its signing actually works
Trade-offs
- −AGPL-3.0 needs reading before embedding it in a product
- −Fewer integrations than DocuSign's ecosystem
- −Younger, with a shorter legal track record
- −Advanced routing and conditional logic are thinner
Free and open source to self-host, with no envelope limits. Documenso Cloud is paid. #2
DocuSeal
The lightest self-hosted option — running in about ten minutes.
90
OPEN SOURCEAGPL-3.0 (open core; paid pro tier)SELF-HOSTLOCAL-FIRST
DocuSeal is a deliberately small signing platform: a PDF form builder, multiple signers, an audit log and an API, deployable with a single Docker command. AGPL-3.0. It does less than Documenso and does it with less setup, which for a small company sending a handful of contracts a month is exactly the right trade. If the reason you have not left DocuSign is that self-hosting sounds like a project, this is the entry that argues otherwise.
Strengths
- +Fastest self-hosted signing to stand up — roughly ten minutes
- +Clean PDF form builder
- +Self-hosted with no envelope limits
- +Very light resource footprint
Trade-offs
- −Fewer features than Documenso
- −Some capabilities reserved for the paid pro tier
- −Small community
- −Less detail published about signing internals
Free and open source to self-host. A paid pro tier adds advanced features. #3
Native PDF signatures
For internal documents, your operating system may already do this.
88
SOURCE-AVAILABLEVaries (built into operating systems and PDF readers)SELF-HOSTLOCAL-FIRST
Worth asking before buying anything: a large share of what companies route through DocuSign is internal — a policy acknowledgement, an expense approval, an NDA between two employees. macOS Preview, Adobe Acrobat Reader and most PDF tools apply a signature with a certificate at no cost, and for internal documents that is frequently sufficient. This is not a product recommendation; it is a scope check. E-signature platforms earn their price on external, contested, high-value agreements — not on getting a colleague to initial a form.
Strengths
- +No cost and no new system to run
- +Genuinely sufficient for internal, uncontested documents
- +Nothing leaves the device
- +Available on essentially every machine already
Trade-offs
- −No workflow, routing, reminders or completion tracking
- −Audit trail is far weaker than a signing platform's
- −Not appropriate for high-value external contracts
- −Legal weight varies by jurisdiction and document type
Free — already present on most machines. #4
OpenSign
A self-hosted signing platform aimed squarely at DocuSign's feature list.
84
OPEN SOURCEAGPL-3.0 (verify current terms — this project's licensing has changed)SELF-HOSTLOCAL-FIRST
OpenSign covers templates, bulk sending, multiple signers, reminders and an audit trail, with a self-hosted deployment and an interface deliberately familiar to anyone coming from DocuSign. Its aim is feature parity rather than reinvention, which makes it the shortest retraining path for a team that already has a signing process it likes. It is smaller and less established than Documenso, and the project's licensing has moved over time, so check the current terms against your intended use before you commit.
Strengths
- +Feature set aimed directly at DocuSign parity
- +Familiar interface — minimal retraining
- +Bulk sending and templates included
- +Self-hostable with no envelope limits
Trade-offs
- −Licensing has shifted historically — check current terms yourself
- −Smaller community than Documenso
- −Less transparent about signing internals
- −Shorter production track record
Free to self-host. Managed cloud tiers are paid. #5
Dropbox Sign
The straightforward commercial alternative, at roughly half the price.
34
SOURCE-AVAILABLEProprietary (hosted service)
Dropbox Sign, formerly HelloSign, does the ordinary signing job well at about $20 per user per month against DocuSign Standard's $45, with a clean interface and a genuinely good API that developers tend to prefer. Listed because a great many companies evaluating DocuSign do not want to run a server — for them the real choice is between commercial vendors, and pretending self-hosting is always the answer would not serve the reader. It is proprietary and hosted, with fewer enterprise routing features than DocuSign.
Strengths
- +Roughly half DocuSign's per-seat price
- +Clean, well-regarded API for embedding signing in a product
- +Simpler interface with less training required
- +Integrates naturally with Dropbox storage
Trade-offs
- −Proprietary and hosted — contracts sit with the vendor
- −Fewer enterprise routing and compliance features than DocuSign
- −Still per-seat with envelope considerations
- −Smaller integration ecosystem
About $20/user/month for the standard tier. Checked 2026-08-04.