EmailOnDeck has a real point of view, which is more than most of this category can say. It's been running long enough to put a counter on the homepage claiming north of 204 million temporary emails processed, the Pro tier takes Bitcoin and Ethereum instead of a card, and the whole flow is built around a captcha gate that keeps bots from strip-mining the domains. If you picked it for those reasons, they're good reasons.
The catch is what that design costs you at the free tier: a captcha before every address, and an inbox lifetime the site never actually publishes. SecondInbox gives you the address in one click and tells you exactly how long the inbox lives. Here's the honest side by side.
What EmailOnDeck does well
Four things it genuinely gets right:
- The captcha is doing a job. Most disposable-email domains get burned because scripts generate thousands of addresses an hour and platforms blacklist the whole domain. A human verification step in front of generation slows that down. EmailOnDeck claims its addresses work "where many disposables are blocked", and the captcha gate is a plausible reason why.
- Crypto-only Pro, no card, no subscription. Pro runs on Bitcoin or Ethereum, currently listed at 0.001042 BTC for 30 days of access, with no recurring charge. For anyone who reaches for a temp email specifically to avoid leaving a payment trail, paying with a card would defeat the point. Very few services in this space get that.
- Pro has an actual API. Programmatic access, custom addresses, saved addresses, and 100-plus inboxes at a time are real developer features, not a repackaged free tier.
- Addresses that stick around. Pro can keep an address active for over a year, and their own copy says a free address "may be recoverable". If you need to come back to the same inbox next week, most temp services can't help you at all.
Where EmailOnDeck falls short
- The captcha is friction on every single address. It's two steps before you have anything: solve the challenge, then click Get Email. Once is fine. Doing it eleven times while you test a signup flow is not, and there's no way to skip it on the free tier.
- The free inbox lifetime isn't published. Their pages say addresses "last longer than 10-minute services". That's a comparison, not a number. You can't plan a verification flow around a duration nobody will state, and third-party reviews disagree with each other about what it actually is.
- Pro locks you into crypto and an account. The same properties that make Pro appealing to a privacy buyer make it unreachable for everyone else. No card option, no PayPal, and you have to register. If you don't already hold BTC or ETH, the paid tier may as well not exist.
How SecondInbox compares
Free tier against free tier. Rows I couldn't verify on EmailOnDeck's own site are not in this list.
- Signup required · EmailOnDeck (free): no · SecondInbox: no
- Steps to get an address · EmailOnDeck (free): captcha, then click Get Email · SecondInbox: one click
- Default inbox lifetime · EmailOnDeck (free): not published · SecondInbox: 30 minutes, one-tap extend
- Selectable lifetimes · EmailOnDeck (free): no · SecondInbox: 10, 30, or 60 minutes
- Paid tier · EmailOnDeck: Pro, BTC or ETH only · SecondInbox: none
- Sending email · EmailOnDeck (free): Pro only · SecondInbox: not offered
- API access · EmailOnDeck (free): Pro only · SecondInbox: not offered
- Multiple addresses at once · EmailOnDeck (free): Pro, 100+ · SecondInbox: free, with optional free account
Two things that list can't show.
The first is what the captcha does to your habits. A one-click inbox is something you reach for casually, the way you'd open a new tab. A captcha turns it into a small decision every time, and the practical result is that people stop bothering and hand over their real address for "just this one signup". The friction protects the domain reputation and taxes the user. Whether that trade is worth it depends entirely on how often you generate addresses.
The second is the shape of the business. EmailOnDeck's free tier exists to sell Pro, so it holds back sending, saved addresses, and the API. SecondInbox has no paid tier to sell you, which is why the free experience isn't engineered to feel incomplete. We're also honest about the flip side: SecondInbox has no API and no sending, at any price. EmailOnDeck Pro will beat us on both.
When to stay with EmailOnDeck
- You need to send or reply from the address. SecondInbox is receive-only with no paid upgrade. EmailOnDeck Pro sends to any recipient. If two-way mail matters, this isn't close.
- You want programmatic access. Pro has an API. We don't offer one.
- You want the same address available months from now. Pro keeps addresses alive for over a year. SecondInbox tops out at 60 minutes per inbox.
- You want to pay in crypto and never touch a card. That's a deliberate design choice on their end, and it's a legitimate reason to stay.
When SecondInbox is the better fit
- You generate addresses more than once in a while. Testing signup flows, working through a list of newsletters, spinning up several throwaway accounts. Every one of those costs you a captcha on EmailOnDeck and costs you a click here.
- You need to know when the inbox dies. Pick 10, 30, or 60 minutes up front, watch the countdown, and extend it with one tap if the verification email is slow. No guessing. If ten minutes is all you need, the 10-minute inbox starts there by default.
- You'd rather not be sold an upgrade. There's no paid tier here, so nothing in the product is held back to create a reason to pay. What you see is the whole thing.
- You want several addresses without paying. Create a free SecondInbox account and manage multiple addresses across sessions. On EmailOnDeck that's a Pro feature priced in Bitcoin.
FAQ
No. They're separate services with separate infrastructure, and neither one exports mail. You'd generate a fresh address on SecondInbox and use it from there.
No. One click and the inbox is live. We rate-limit address creation per IP instead, which keeps automated abuse down without putting a challenge in front of every user.
Sometimes, yes. Google, Facebook, and a handful of other large platforms maintain blocklists of known disposable domains, and every service in this category lands on some of them eventually. EmailOnDeck's captcha gate likely helps its domain reputation, and that's a fair point in their favour. For smaller sites, forums, and newsletter signups, it rarely comes up. There's more detail in <a href="https://secondinbox.com/blog/why-websites-block-temporary-email-addresses">why websites block temporary email addresses</a>.
No, and there won't be. There's no paid tier, so the features Pro gates (sending, API access, year-long addresses) aren't available here at any price. What's free is the whole product.
They take different routes. EmailOnDeck sells Pro for crypto so paying users leave no card trail, which is a real privacy advantage if you're paying for anything at all. SecondInbox runs no tracking cookies, doesn't sell user data, and keeps your IP only briefly for rate-limiting before discarding it. Neither can promise absolute security, and any service that does is overselling. Read both policies if privacy is the deciding factor.
If you're comparing more than one option, the Temp Mail comparison covers the other end of this market: bigger, ad-supported, and with a subscription instead of a crypto payment.