Our method
For two weeks, we forwarded a real, cluttered inbox — newsletters, client threads, calendar spam, the works — through five AI email assistants. Each tool got the same starting point and the same rule: triage time only counts if a human still reads and approves every reply before it sends.
We tracked minutes spent per day on email before the test, then again with each tool active for three days apiece, rotating order to cancel out any "getting used to it" effect.
Baseline inbox time was 54 minutes a day, spread across roughly nine separate check-ins. That number matters more than any feature list — it's the thing every tool below is actually competing against.
We scored each assistant on three things: how much daily time it actually removed, how often its drafted replies needed heavy editing, and how it handled genuinely ambiguous messages instead of guessing confidently and getting it wrong.
"The best tool wasn't the one that wrote the fanciest reply — it was the one that correctly decided which nineteen emails didn't need one at all."
What we found
Triage — deciding what needs a reply today, what can wait, and what's safe to archive — accounted for more saved time than drafting did. The tools that modeled our priorities after a few days beat the tools that wrote longer, more polished drafts from message one.
Two tools also meaningfully reduced notification anxiety: instead of forty pings, we got one grouped morning digest with suggested actions attached.
The five, ranked
- Tool A — 38% time saved. Best triage logic; drafts needed light edits about a third of the time.
- Tool B — 31% time saved. Strong drafts, weaker prioritization out of the box.
- Tool C — 24% time saved. Great digest view, but replies leaned generic.
- Tool D — 17% time saved. Solid for short replies, struggled with long threads.
- Tool E — 9% time saved. Impressive demo, underwhelming on messy real inboxes.
Verdict
If you check email more than five times a day out of anxiety rather than necessity, the triage-first tools (A and C) will save you more real time than the ones optimized purely for writing quality. If your inbox is mostly short client replies, B is worth a two-week trial.
None of these tools should send anything unsupervised yet — every pick here still puts a human in the loop before send, and that's a feature, not a limitation.
