Cold email tools
SEMAOS vs Mailshake
TL;DR. These are the closest match — both are mailbox-first, per-seat outbound tools for small teams. Mailshake bundles more into the sequence engine: a built-in lead finder, a phone dialer, and LinkedIn steps. SEMAOS goes the other way — a focused email tool that adds two things Mailshake doesn't: one-off newsletters/broadcasts, and a real 0–100 engagement score per contact (Mailshake tracks qualitative “lead temperature”). Pick Mailshake if you want the lead data + dialer in the box; pick SEMAOS if you want focused email + newsletters + engagement scoring.
How they compare
| Dimension | SEMAOS | Mailshake |
|---|---|---|
| Primary model | Mailbox-native 1:1 sequences + broadcast | Simple SMB cold outreach (mailbox-first) |
| Sending | Your own Gmail/Outlook (1:1) + SEMAOS sending (broadcast) | Mailbox rotation, inboxes capped per tier |
| Newsletters / broadcasts | Yes — designed broadcasts over a sending domain | No — cold outreach only |
| A/B testing | Yes — subject + content tests on broadcasts; winner auto-sent to the rest, or held for your approval | Yes — up to 10 segments per campaign; results compared manually |
| Engagement scoring | Yes — 0–100 score + Hot/Warm/Cool tiers | Qualitative “lead temperature,” not a score |
| Built-in lead database | No — bring your own (CSV import) | Yes — Data Finder (credit-metered) |
| Multichannel | Email only | Yes — dialer + LinkedIn/social (top tier) |
| Unified reply inbox | Reply detection pauses sequences on Outlook and platform sends (not Gmail yet); no central inbox | Yes — Lead Catcher |
| Free trial | 30-day full trial | Money-back on annual (check current terms) |
| Pricing model | Flat, seats included, contacts unmetered | Per seat, mailbox count capped per tier |
| Best for | Small teams wanting email + newsletters + scoring | Small teams wanting lead data + dialer in one tool |
When is Mailshake the better choice?
Mailshake is the better choice when you want a lead database, a dialer and LinkedIn steps next to your email.
- You want a built-in lead database and verification so prospecting and sending live in one tool.
- You want a phone dialer and LinkedIn steps in your sequences — Mailshake includes both on its top tier; SEMAOS is email-only.
- You want the Lead Catcher unified inbox to triage and reply to responses in one place today.
When is SEMAOS the better choice?
SEMAOS is the better choice when you want newsletters and 1:1 sequences in one product, with an engagement score on every contact.
- You also run newsletters/broadcasts. Mailshake is cold-outreach-only; SEMAOS does designed broadcasts and 1:1 sequences from one product.
- You want a real engagement score. Every contact gets a 0–100 score and a Hot/Warm/Cool tier you can branch sequences on — Mailshake only flags qualitative “lead temperature.”
- You want mailbox sending without inbox caps by tier. Connect Gmail/Outlook for 1:1; every paid SEMAOS plan allows three mailboxes per person. Mailshake caps sending addresses per plan and pushes you up-tier to add more.
- You want to try before you pay. SEMAOS gives you a 30-day full free trial with no charge during the trial — compare that against Mailshake's current trial terms.
How many mailboxes and sends does SEMAOS allow?
One rep on a paid SEMAOS plan can send up to 3,000 emails a day from their own mailboxes: 250 to 1,000 per connected Gmail or Outlook mailbox depending on the kind of account, with up to 3 mailboxes per person. Broadcasts and large enrollments go over platform sending instead, which a new custom domain ramps up over at least 21 days.
| Sending from | Limit | Counts against your plan? |
|---|---|---|
| One connected mailbox | 250 to 1,000 a day | No |
| One rep, 3 mailboxes | Up to 3,000 a day | No |
| New custom domain, week 1 | 100 a day | Yes, the monthly platform pool |
| New custom domain, week 2 | 500 a day | Yes, the monthly platform pool |
| New custom domain, week 3 | 2,000 a day | Yes, the monthly platform pool |
| Warmed-up domain | The plan's pool: 7,500 (Solo) to 200,000 (Business) a month, then the on-demand bank on paid plans | Yes |
Each warmup step also waits until the domain has sent enough to earn the next one, so a domain that sends little stays on a lower step. SEMAOS sets each mailbox's cap by the kind of account: 250 for a personal Outlook account, 400 for a personal Gmail account, and 1,000 for a Google Workspace or Microsoft 365 account. A provider can still refuse sooner, for example on a new account. SEMAOS is not built to rotate dozens of throwaway inboxes. The ceiling is set by your team's real mailboxes and one warmed-up domain (5 on Business).