Data verified September 25, 2026
Mailshake vs Success.ai
Mailshake is cheaper at entry level for one seat (cheapest paid plan): $29 per month against $99. Mailshake wins 1 of our 8 comparison points, Success.ai wins 2, 3 are ties.
Data verified · Sources: Mailshake pricing, Success.ai pricing, Methodology
Verdict
Who wins, point by point
| Dimension | Mailshake | Success.ai | Winner |
|---|---|---|---|
| Cheapest paid plan for 1 seat (per month) | $29 (Starter, billed monthly) | $99 (Starter, billed monthly) | Mailshake |
| Cheapest paid plan for 5 seats (per month) | $145 (Starter, billed monthly) | $99 (Starter, billed monthly) | Success.ai |
| Free plan | Not published | No | Not comparable |
| Email sender limit | Unlimited | Unlimited | Tie |
| Warmup included | Yes | Yes | Tie |
| Email verification | Included | Included | Tie |
| CRM | Not published | Included | Not comparable |
| G2 rating | 4.7 (373 reviews, 2026-06-20) | 4.9 (258 reviews, 2026-01-08) | Success.ai |
The differences
What the numbers say
For 1 seat, Mailshake's cheapest paid plan costs $29 per month against $99.
For 5 seats, Success.ai's cheapest paid plan costs $99 per month against $145.
Success.ai rates 4.9 on G2 against 4.7.
We cannot compare free plan, CRM, because at least one of the two vendors does not publish it.
Every plan
Plan by plan, side by side
Mailshake: 4 plans
| Starter | Email Outreach | Sales Engagement | Agency Plan | |
|---|---|---|---|---|
| Price, billed monthly | $29/mo | $49/mo | $99/mo | Custom |
| Price, billed annually (per month) | $25/mo | $45/mo | $85/mo | Custom |
| Email sender limit | 1 | 2 | 10 | Unlimited |
| Warmup: accounts warmed at once | Yes | Yes | Yes | Yes |
| Emails per month | 1,500 | Unlimited | Unlimited | Unlimited |
| Unibox (shared reply inbox) | No | Yes | Yes | Yes |
Sources: mailshake.com/pricing/
Success.ai: 3 plans
| Starter | Growth | Enterprise | |
|---|---|---|---|
| Price, billed monthly | $99/mo | $199/mo | Custom |
| Price, billed annually (per month) | $74/mo | $149/mo | Custom |
| Warmup: accounts warmed at once | Yes | Yes | Yes |
| Emails per month | 50,000 | 150,000 | Unlimited |
| Lead-search credits per month | 6,000 | 10,000 | Not published |
| CRM | Yes | Yes | Yes |
| Unibox (shared reply inbox) | Yes | Yes | Yes |
Sources: www.success.ai/pricing
When to pick which
Pick Mailshake if…
- Its pricing page targets agencies, which Success.ai's does not.
- It wins on cheapest paid plan for 1 seat (per month).
Pick Success.ai if…
- Its pricing page targets solo founders, enterprise teams, which Mailshake's does not.
- It wins on cheapest paid plan for 5 seats (per month), G2 rating.
You ask, we answer
Common questions
Is Mailshake cheaper than Success.ai?
Yes at entry level: $29 vs $99 per month for one seat.
How much warmup do Mailshake and Success.ai include?
Mailshake: yes. Success.ai: yes.
How many email senders can I connect to Mailshake or Success.ai?
Mailshake: unlimited. Success.ai: unlimited.
Do Mailshake and Success.ai include email verification?
Mailshake: included. Success.ai: included.
Do Mailshake and Success.ai have a built-in CRM?
Mailshake: not published. Success.ai: included.
Which is rated higher on G2, Mailshake or Success.ai?
Mailshake: 4.7 (373 reviews, 2026-06-20). Success.ai: 4.9 (258 reviews, 2026-01-08).