Comparison
Sign PDF vs BoldSign
Short answer
BoldSign has a generous free plan with 25 envelopes a month and automatic field detection, and its cheapest paid plan, Growth, is $15 a user a month ($5 billed yearly) for 50 envelopes a user. Sign PDF has no free plan but costs $10 a month for unlimited documents, month to month. If you send fewer than 25 documents a month and want to pay nothing, BoldSign is the better choice.
Updated 25 October 2026
| Sign PDF | BoldSign | |
|---|---|---|
| Cheapest plan that sends | Light, $5 a month for 2 documents | Essential, free, 25 envelopes a month |
| Cheapest paid plan | Light, $5 a month | Growth, $15 a user a month, or $5 billed yearly |
| Unlimited documents | Full, $10 a month | Business, $25 a user a month, or $15 billed yearly |
| Boxes placed for you | Yes, matched to each signer | Automatic field detection on every plan; AI-powered from Business |
| Templates | On Full | 2 free, 10 on Growth, unlimited on Business |
| API | Not offered | From $30 a month with 40 envelopes, then $0.75 each |
| Delivery | Email; SMS and WhatsApp as add-ons |
Why people switch to Sign PDF
- Unlimited documents for $10 a month, not $25 a user
- One flat price that does not grow per user
- Fields you can change by typing a plain-English request
- Upload Word, Pages, Excel or a phone photo of a printed page
- A DigiCert-timestamped seal and public verify page on every document
When BoldSign is the better choice
- You send 25 documents a month or fewer and want to pay nothing.
- You need an API, with a free sandbox to build against.
- You want SMS or WhatsApp delivery, or ID verification for signers.
- Your team needs SSO, roles, or HubSpot and Salesforce integrations.
- You want native iOS and Android apps.
BoldSign's plans in plain numbers
BoldSign lists four plans for senders. Essential is free with 25 envelopes a month, 2 templates and one user. Growth is $15 a user a month on monthly billing or $5 on yearly billing, with 50 envelopes per user a month and 10 templates. Business, the first plan with unlimited envelopes, is $25 a user a month or $15 yearly.
Premium is $138 a month or $99 a month yearly for 250 envelopes, and the Enterprise API plan starts at $30 a month with 40 envelopes, then $0.75 an envelope.
Be honest: when is the free plan enough?
Most of the time, for light use. Twenty-five envelopes a month is more than many freelancers and landlords ever send, and BoldSign lists automatic field detection, reminders, signer authentication and an audit trail on the free plan.
Our case is narrower. If you send more than 25 documents a month, or you want unlimited documents without per-user pricing, Full is $10 a month. BoldSign's unlimited Business plan is $25 a user on monthly billing.
How the field placement compares
BoldSign lists automatic field detection on every plan and AI-powered field detection from Business. That puts it ahead of most tools in this list.
Sign PDF also matches each box to a signer by reading labels such as Landlord, Tenant or Witness, and it lets you change fields by typing requests like "add a date under each signature" or "tenant initials every page". Try both on the same document and keep whichever gets it right more often.
Where BoldSign has more
BoldSign has iOS and Android apps, SSO and custom roles on Business, HubSpot built into Business, Salesforce and Xero as add-ons, and add-ons for bulk send, SMS and WhatsApp delivery, and ID verification. It also offers a free API sandbox for developers.
Sign PDF offers none of those. We send by email only, have one user per account, and do not verify identity documents.
BoldSign details come from BoldSign pricing, checked on 25 October 2026. Prices change, so check before deciding. BoldSign is a trademark of its owner. We are not affiliated with it.
Questions people ask
Is BoldSign free?
Yes. The Essential plan is free with 25 envelopes a month, 2 templates and one user. It is one of the more generous free plans we have seen.
How much is BoldSign for unlimited envelopes?
Business is $25 a user a month on monthly billing or $15 a user a month on yearly billing. Sign PDF Full is $10 a month, month to month, for unlimited documents.
Does BoldSign detect fields automatically?
Its pricing page lists automatic field detection on every plan and AI-powered field detection on Business. Sign PDF places boxes on every plan too and assigns each one to a signer from the surrounding wording.
Why pay for Sign PDF if BoldSign is free?
If you stay under 25 envelopes a month, you may not need to. Sign PDF suits people who send more, want a flat $10 with no per-user pricing, or prefer to edit fields by typing a request.
Leaving BoldSign? Try it on your next document
Upload it and see every box placed before we ask for anything. $5 or $10 a month, no yearly contract.
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