Compare
MorningZero against the tools you're probably weighing.
Prices read from each vendor's own page, with the date we read them. Each detailed comparison opens with who should pick the other product, then the table, then where we lose. That order is deliberate.
Superhuman
The fastest email client made, for one account at a time. Tabs per account, $30 a seat monthly or $25 yearly. If you run one inbox and want speed, pick it. Several inboxes is where the comparison starts.
Read more →Spark
A real free tier with unlimited accounts, and AI credits on the paid plans. Good if $0 is the requirement. The caps sit below the plan cards; we read them so you don't have to.
Read more →Shortwave
Sharp AI search with a published daily request quota, from $30 a seat. Built Gmail-first. Right for a Google-only team that wants an assistant; the fit ends where your mailboxes leave Google.
Read more →Gmail and Outlook
Free, and genuinely fine for one inbox. Filters, templates, schedule send and multiple-inbox panes are built in. The case for anything else begins at the second account, not before.
Read more →On one screen
What each one costs, and what each one rations.
Per seat or per mailbox is the biggest driver of what you actually pay once you have more than one account. The meter column is the second.
| Product | Free plan | Entry tier | Next tier | Several accounts | What's metered | Checked |
|---|---|---|---|---|---|---|
| MorningZero | No. 14-day trial, no card | Solo $19/mo, 5 mailboxes ($15 yearly) | Stack $29/mo, 15 mailboxes ($23 yearly) | One merged stream. Extras $3/mo each | Nothing. No credits, no request quotas | 20 Sep 2026 |
| Superhuman | No | Starter $30/seat/mo ($25 yearly) | Business $40/seat/mo ($33 yearly) | Tabs, one view per account | No per-request AI limits published | 4 Sep 2026, read in a browser |
| Shortwave | No. 14-day trial | Business $30/seat/mo | Premier $45, Max $120 | Gmail-first | AI requests per day (about 150–300 on Business), threads per AI search | 20 Sep 2026 |
| Spark | Yes. Unlimited accounts at $0 | Plus $10/user/mo ($8.25 yearly) | Pro $20/user/mo ($16.58 yearly) | Per user; accounts unlimited | AI credits per month; meeting notes counted separately | 20 Sep 2026 |
| Missive | Yes | Starter $18/user/mo ($14 yearly) | Productive $30 ($24), Business $45 ($36) | Per user; built for shared team inboxes | AI credits, or bring your own key | 5 Aug 2026 |
| Gmail / Outlook | Yes, for personal use | AI arrives with paid Workspace or Microsoft 365 tiers | — | Account switching, not merging | Tier-gated rather than metered | 5 Aug 2026 |
Superhuman's pricing page renders client-side and could not be re-read automatically on 20 September; the figures are from a browser read on 4 September 2026. Missive and the Gmail row were last checked 5 August 2026. Vendors change prices; click through before deciding anything.
Where we lose
The marks against us, kept in.
No free plan. Spark and Missive run at $0 indefinitely; we don't.
No iPhone app yet. It runs on the web, macOS, Windows, Linux and Android, and in Safari on an iPhone.
No shared team inbox. Stack is a bigger allowance for one person, not a team plan. Missive and Front do this well.
No Proton, and no self-serve custom or self-hosted IMAP. Thirteen providers connect; Enterprise customers can ask us to evaluate their own server.
Young. Superhuman and Spark have years of polish; we have months, and one 11-day sync outage we wrote up in full.
The longer version, with six products and the same dated sources, is in the unified inbox comparison. Per-mailbox cost at 1, 3, 5, 10 and 15 accounts across fourteen apps is in what multiple mailboxes actually cost. Our pricing →
Nothing sends itself
Run the comparison on your own mail.
Connect two mailboxes, no card, and see what the triage does with a real morning. That beats any table on this page, ours included.