DocuSign API alternatives for developers: what to compare before you pick

You need to send documents for signature from your own product. So you search "docusign api alternative", and you get a wall of comparison tables written by companies that each win their own table.

I'm not going to pretend to be neutral. I build PutMySign. But I can be useful anyway, because the fiddly part of picking an e-signature API isn't the feature list. It's four questions that nobody puts above the fold. And I've linked every number below to the page it came from, so check me.

Embedded signing is on the plan above this oneThis is fine

1. Is embedded signing in the plan you can afford?

Embedded signing means the signer signs inside your app, in an iframe, not in their inbox. If that's your product, it's the whole point. So check the plan, not the feature name.

• DocuSign. Developer plans are listed at $50 a month (Starter), $300 (Intermediate) and $480 (Advanced), with Enhanced as contact sales. In the plan comparison table on that page, "Embedded signing" is marked as included only on Enhanced. "Embedded sending" is on all four. They are different features, so read that row carefully. Source.
• Dropbox Sign. Their help centre says embedded signing and embedded requesting start at the Standard API plan, $250 a month. Embedded templates need Premium. Source.
• SignWell. Embedded signing, requests and templates are listed on the API pricing page. Source.
• PutMySign. Embedded signing is included on both plans, and so is the API. Source.

Pick the cheapest e-signature APIBuild the whole integrationAsk where the iframe isIt's the other plan

2. How much does one document cost at your volume?

Plans quote a "starting amount" of documents or envelopes per month. What you care about is what happens past it, and what a single send counts as.

• DocuSign's Starter lists 40 envelopes a month and Intermediate 100, at the prices above.
• Dropbox Sign lists Essentials at $75 a month starting at 50 signature requests, and Standard at $250 starting at 100 requests.
• SignWell says the first 25 API documents a month are free with a card on file. After that it starts at $0.85 per API document and goes down with volume. One API document counts once, however many files or signers it has.
• PutMySign is $0 for 10 documents a month and $19 a month for 100. Source.

Pricing pages change. Treat these as the numbers on the day I checked, and read the live page before you decide.

If you send a few documents a month, the gap between "free tier" and "$250 a month" is the whole decision. If you send thousands, ask each vendor for the real per-document price at that volume. A published starting plan won't tell you.

3. Can you test without sending real email?

Everyone says "sandbox". What you want to know is how much of the real thing it runs, and how long it takes to get one.

• DocuSign's page says a free developer account runs in their demo environment.
• Dropbox Sign has a test_mode flag that exercises the endpoints from a free account.
• SignWell says its free developer account has unlimited test usage.
• On PutMySign, a test key works just like a live one except it never sends email, and a key works the moment you create it. Source.

Test against production with a real customer's emailA staging account with its own setupA test flag in the same APIA test key that behaves like a live key and sends nothing

4. What does your server hear back?

Embedded or not, you need to know when a document is really finished. Not when a browser says so. When the server says so.

Check three things in whatever API you pick:

1. Are webhook deliveries signed, and can you verify them over the raw body?
2. Are failed deliveries retried, and for how long?
3. Do you get the finished PDF with the audit trail already inside it, or a second file to fetch?

PutMySign signs every delivery with HMAC over the timestamp and the raw body, retries for a day if your endpoint is down, and hands you the sealed PDF on document.completed. Details. I'd ask every other vendor the same three questions. I haven't compared their answers here, because I'd rather leave a gap than guess.

Your webhook handler returns 200 before checking the signatureBut that's none of my server's business

When PutMySign is not the right pick

Some honest ones:

• You need a vendor that's been through years of procurement checklists at big companies. DocuSign has that, and I'm a one-person product.
• You need advanced workflow features like bulk send or custom mobile signing experiences. DocuSign lists those on its higher developer plans, and I don't have them.
• You already pay for a DocuSign or Dropbox plan that covers your volume. Switching has a cost, and a cheaper API doesn't pay it back on its own.

PutMySign makes sense if you want embedded signing and webhooks without a big monthly floor, and you'd like to be in production the afternoon you start.

The short version

• Check which plan has embedded signing. Not which vendor.
• Work out what one document costs at your volume, past the "starting amount".
• Test mode should run the real flow and send nothing.
• Webhooks: signed, retried, and the finished PDF with its audit trail inside.

If you want to see how it works with real code, there's a guide for Next.js and one for React. The signature API page shows the request and the webhook flow, the docs have every field, and pricing is the whole price list.

What tipped it for you when you picked yours? Price, the embedding, or just whichever docs you could read at 1am?