Success.ai vs Instantly.ai
Choose Success.ai if you want lead discovery and AI-assisted outreach in the same workflow; choose Instantly.ai if published sending limits, unlimited accounts on paid outreach plans, and separately priced lead credits matter more. Both support cold-email campaigns and warmup, but their published plan details make Instantly.ai easier to budget before signing up.
Last updated October 24, 2026.
At a glance
| Dimension | Success.ai | Instantly.ai |
|---|---|---|
| Outreach starting price | Not published | Growth: $47/month |
| Lead data | Lead Finder; 800M+ records advertised | 450M+ contacts; separate credits plans |
| Lead usage | Plan-based lead balance and storage limits | Growth Credits: 1,500/month for $47 |
| Growth outreach limits | Not published | 1,000 uploaded contacts; 5,000 emails/month |
| Higher-volume plan | Not published | Light Speed: $358/month; 500,000 emails/month |
| Connected sending accounts | Multiple accounts; plan cap not published | Unlimited on paid outreach plans |
| Email warmup | Automated warmup | Unlimited on paid outreach plans |
| AI outreach | ICP Operator generates leads and sequences | AI Email Writer Agent in credits plans |
| Integrations | Webhooks; Google Sheets import | API and Zapier; webhooks on Hypergrowth |
| Deployment | Web-based workspace | Web-based workspace |
| Support | Help Center and support contact | Growth chat; Hypergrowth premium live support |
| Free trial | Free signup; trial terms not published | 14 days; no credit card required |
Scroll the table sideways to compare each row.
Which should you choose?
Choose Success.ai if
- Teams that want lead discovery alongside campaign creation
- Sellers who want an AI operator to generate prospect-specific sequences
- Teams importing leads from files or Google Sheets
Choose Instantly.ai if
- Teams budgeting against published monthly sending limits
- Agencies connecting many email accounts on a paid outreach plan
- Buyers who want lead credits priced separately from outreach
- High-volume senders considering the Light Speed plan
The verdict
The deciding factor is how you want to plan and run outreach. Success.ai fits teams that want to find prospects, generate sequences, and manage replies in one workflow. Instantly.ai fits teams that need to choose a plan against stated contact and monthly email limits, with optional lead credits. Confirm Success.ai’s current price and plan allowances before buying; those details could not be verified from its accessible vendor pages.
Success.ai vs Instantly.ai: common questions
- What is the main difference between Success.ai and Instantly.ai?
- Success.ai brings Lead Finder and AI-generated prospect sequences into its outreach workflow. Instantly.ai publishes distinct outreach and lead-credit plans, with explicit contact and email limits for its outreach tiers.
- How much do Success.ai and Instantly.ai cost?
- Success.ai’s current plan prices could not be verified from its accessible vendor pages. Instantly.ai lists Growth outreach at $47 per month and Growth Credits separately at $47 per month.
- Do Success.ai and Instantly.ai include lead databases?
- Success.ai advertises lead sourcing from more than 800 million records through its signup experience. Instantly.ai advertises a database of more than 450 million B2B contacts through separately priced credits plans. Database size does not state how many contacts a subscription lets you unlock.
- Can I connect unlimited email accounts to either platform?
- Instantly.ai explicitly includes unlimited email accounts on paid outreach plans, but its trial permits two. Success.ai documents connecting multiple accounts; a current plan-specific account allowance was not verifiable from its accessible vendor pages.
- Is email warmup unlimited on both platforms?
- Instantly.ai lists unlimited warmup on paid outreach plans and limits its trial to two accounts. Success.ai documents automated warmup, but its current plan-specific warmup allowance was not verifiable from its accessible vendor pages.
- What are Instantly.ai's entry-plan sending limits?
- Instantly.ai’s Growth outreach plan lists 1,000 uploaded contacts and 5,000 emails per month. Its uploaded-contact limit is a fixed capacity across campaigns, not a monthly refill.
- What integrations do Success.ai and Instantly.ai document?
- Success.ai documents webhooks and importing leads from Google Sheets. Instantly.ai documents an API and Zapier on Growth outreach, with webhooks on Hypergrowth and higher plans.
- Can I try Success.ai and Instantly.ai before paying?
- Success.ai offers free account signup, but trial length and allowances were not verifiable from its accessible vendor pages. Instantly.ai publishes a 14-day trial without a credit card, limited to two email accounts, 250 uploaded leads, and 1,000 campaign emails.