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SaneBox vs Superhuman: how do the two email tools price and convert?
Short answer
They are opposites. SaneBox is a lean, mature business with $9.49-42.99 a month plans, a 7-day trial without a card, 19 Meta ads and about 116K site visits a month. Superhuman Mail charges $25-40 per seat, takes a card up front for a 30-day trial, and runs 55 Meta ads across 3 Pages as part of a Grammarly suite. Neither shows a per-day price.
Key facts
- verifiedSaneBox plans in October 2026 ran from $9.49 a month for 1 account to $42.99 a month for 4 accounts, with a 2-year term pre-selected.
- verifiedSuperhuman Mail costs $30 a month or $25 yearly on Starter and $40 or $33 on Business, with a 30-day trial that takes a card and shows Due today $0.00.
- verifiedOn October 26, 2026 SaneBox ran 19 Meta ads on 1 Page, all video, while Superhuman ran 55 ads on 3 Pages.
- estimateSaneBox had 116K site visits in September 2026, down 24.5% on the month, while Superhuman's roughly 6M includes Grammarly and Coda traffic.
- rumourAn old founder interview put SaneBox profit just under 50%, churn near 1.5% a month and organic trial-to-paid at 20-25%.
Recommendation
Keep $10 a month for the first mailbox. Make yearly $99 and the pre-selected default. Charge $5 a month for each extra mailbox. Keep the 30-day free trial with the card taken up front, but say "$0 today" and send a reminder 7 days before the charge.
Lead with the daily price: "27¢ a day" on yearly and "33¢ a day" on monthly. Neither competitor uses daily framing, so it is open ground. The friend coupon should be 2 months free for the friend and 1 free month for the referrer on every friend who becomes a paying customer, not every 5th.
3. Side by side
| Entry price | $9.49/mo, $65/yr, $109/2yr (1 account, 2 of 11 features) | $30/mo or $25/mo yearly (Starter, per seat) | $10/mo, $100/yr per mailbox, all features |
| Top self-serve plan | Dinner $42.99/mo, 4 accounts, all features | Business $40/mo or $33 yearly; Enterprise "Let's talk" | No tiers |
| Default term shown | Every 2 years (pre-selected) | Annual, "17% off" (pre-selected) | Monthly |
| Anchors | Monthly-equivalent price; strike-through data in page JSON (52% off) but not shown | "17% off", "Best value" badge, "15% off for teams of 5+" | None |
| Trial | 7 days, all features, up to 4 accounts; can be extended by asking support | 30 days | 30 days |
| Card up front | No ("No credit card required") | Yes, $0 today, Stripe | Yes (Stripe Checkout, payment_method_collection: always) |
| Where card is taken | In-app Billing page (/dashboard/subscription) during or after trial | /mail/checkout, after OAuth, before download | In-app paywall, after Google sign-in |
| Checkout | Stripe Elements; also PayPal and Amazon Pay | Stripe (SetupIntent, Stripe.js 7.5) | Stripe Checkout |
| Referral | Subscribers: free month per friend. Trial users: $5 credit. Friend: $5. Affiliates (PartnerStack): up to 30% lifetime; friend $25 credit | "Sent with Superhuman" signature and calendar loop; impact.com and dub.co affiliates; partner and VC links give 1–2 free months; startups 12 months free | Friend: 2 months, no card. Referrer: free month per 5 friends |
| Discounts | Education, non-profit, government: 25% off. Save offers in code. Gift subscriptions | Startups; students and non-profits by email; promo-code field in checkout | Promo codes allowed (not used yet) |
| Providers | Anything with IMAP, EWS or ActiveSync (section 4) | Gmail and Outlook only (OAuth) | Gmail OAuth plus IMAP app passwords (iCloud, Yahoo, Fastmail, AOL, GMX, Zoho); no Outlook.com |
4. SaneBox in detail
🔒 Unlock this section99 data points5. Superhuman in detail
🔒 Unlock this section15 data points6. Traffic, company and market benchmarks
🔒 Unlock this section165 data points7. Paid ads
🔒 Unlock this section12 data points8. Tracking and tools
🔒 Unlock this section23 data pointsMethod and sources
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Questions
How much does SaneBox cost compared with Superhuman?
SaneBox costs $9.49-42.99 a month depending on accounts and features, or less on its 2-year term. Superhuman Mail costs $25-40 per seat per month, with annual billing pre-selected at 17% off.
Do SaneBox and Superhuman require a credit card for the trial?
SaneBox does not: its 7-day trial needs no card, which is taken later on the Billing page. Superhuman's 30-day trial takes a card at checkout through Stripe, with $0 due today.
Which email providers does each tool support?
SaneBox works with anything offering IMAP, EWS or ActiveSync, including Gmail, Microsoft 365, Outlook.com, Yahoo, iCloud and Fastmail, but not POP-only or ProtonMail. Superhuman Mail supports Gmail and Outlook only.