Our verdict
SimplyBoost is the better pick for most teams
Choose SimplyBoost if your customers write on WhatsApp and Instagram as well as your website, or if you want three agents and a lower starting price. Every plan includes all three channels.
SimplyBoost vs Sleak
Sleak, at sleak.chat, is an AI agent builder from Tilburg, made by Dutch people for Dutch businesses. It focuses on website chat for helpdesk, ecommerce and lead generation, and it now publishes its prices: Start, Grow and Scale, each with 300 conversations a month and €0.09 for every conversation after that. SimplyBoost is Dutch too, registered in Utrecht, and its agent answers in the language each customer writes in. The bigger difference is channels: SimplyBoost already answers on WhatsApp and Instagram, next to your website.
Short answer
For most businesses, SimplyBoost is the better Sleak alternative when you need more than website chat: WhatsApp and Instagram are live on every plan, with 500 to 6,000 AI replies included for €39, €89 or €169 a month. Sleak starts at €59 a month on yearly billing with 300 conversations, charges €0.09 for each conversation after that, and lists WhatsApp as beta and Instagram as planned.
To be fair
When Sleak fits
Sleak still suits Dutch webshops that only need website chat and like hands-on onboarding and integrations with tools such as Channable and Sendcloud.
SimplyBoost vs Sleak at a glance
The capabilities teams most often switch for, side by side.
| Capability | SimplyBoost | Sleak |
|---|---|---|
| Pricing model | Flat €39 / €89 / €169 | Plans with 300 conversations, then €0.09 each |
| Entry plan | €39 a month (€31 billed yearly) | Start €69 a month (€59 billed yearly) |
| Included volume | 500, 2,000 or 6,000 AI replies | 300 conversations on every plan, then €0.09 each |
| AI agents | 3 on every plan | 1 on Start, 3 on Grow, 5 on Scale |
| Channels | Website chat, WhatsApp, Instagram | Website; WhatsApp in beta; email and Instagram DM planned for Q4 2026 |
| Free trial | 7 days, 100 AI replies | 14 days, no payment details |
| Flat pricing (no per-seat or per-resolution) | Yes | Partial |
| Native WhatsApp | Yes | Partial |
| Native Instagram DMs | Yes | No |
| One AI agent across web + social + WhatsApp | Yes | Partial |
| Data hosted in Europe | Yes | Not published |
| Lead capture and scoring | Yes | Partial |
| No-code setup | Yes | Yes |
Last checked: 7 October 2026. “Partial” = paid add-on, limited, or region/plan option. “Not published” = the vendor doesn’t say on its site. Verify current details on Sleak’s site.
Why teams switch from Sleak to SimplyBoost
- 1WhatsApp and Instagram work today, on every plan, with the same agent as your website chat.
- 2A lower start: €39 a month, against €69 (or €59 billed yearly) for Sleak Start.
- 3Three agents from the first plan, handy for a second brand or website. Sleak Start includes one.
- 4A set monthly allowance with no per-conversation charge. At the limit the agent pauses until the allowance resets or you upgrade.
- 5Instagram comment-to-DM rules on top of AI answers to DMs, so a comment on a post can turn into a sale.
Comparison checklist
Starts at €39 a month, where Sleak Start is €69, or €59 billed yearly
500 to 6,000 AI replies included, where every Sleak plan includes 300 conversations and charges €0.09 for each one after that
WhatsApp and Instagram live on every plan, where Sleak lists WhatsApp as beta and Instagram DM for Q4 2026
3 AI agents on every plan, where Sleak Start includes 1
Replies in the customer's language, or one fixed language: English, Dutch, German, French or Spanish
Both companies are Dutch, and SimplyBoost is hosted in Europe
A 7-day free trial with 100 AI replies
Shopify Integration and Product Suggestion Analysis
Sleak lists ecommerce as one of its main use cases, with integrations for Shopify, WooCommerce, Lightspeed and Magento and a product recommendation carousel. SimplyBoost connects to Shopify and, from the Growth plan, recommends products, builds a cart with a checkout link and answers order questions on your website, WhatsApp and Instagram.
Where SimplyBoost usually leads
- Catalogue sync, with recommendations based on the customer's need, budget or use case.
- The same Shopify help on WhatsApp and Instagram, where Sleak is website-first today.
- Cart reminders on WhatsApp and Instagram within 24 hours of the customer's last message.
Where Sleak still has strengths
- Integrations with Dutch ecommerce tools such as Channable, Sendcloud and Picqer.
- Order and stock status through APIs you connect yourself.
Smart checklist before you decide
- Do you sell mainly in the Netherlands, or in several countries and languages?
- How many conversations a month would you go over 300, and what does €0.09 each add?
- Which channels do you need today: website only, or WhatsApp and Instagram too?
- Which Shopify questions should customers be able to sort out themselves?
Based on public product information checked on 7 October 2026.
Who should choose which
Choose SimplyBoost for
- Dutch and European businesses whose customers write on WhatsApp and Instagram
- Teams that want three agents and a lower starting price
- Shops that want product help in DMs as well as on the website
- Businesses selling in more than one language, with one agent for every market
Choose Sleak for
- A Dutch-first product and team, with a dedicated customer success manager on Scale
- Integrations with Dutch ecommerce tools such as Channable, Sendcloud and Picqer
How to switch from Sleak
Most teams do this in an afternoon and keep Sleak running until the answers look right.
Step 1
Add your knowledge
Add your website, product pages and documents. The knowledge base guide lists every source type.
Step 2
Set the agent's tone
Write your instructions in plain text and choose whether the agent matches the customer's language or always answers in Dutch.
Step 3
Choose where handovers go
Pick email, the dashboard, Slack or your helpdesk. The handover guide covers each option.
Step 4
Test with real questions
Ask the questions your customers sent most last month and add answers where the agent comes up short.
Step 5
Go live and add channels
Swap the Sleak widget for SimplyBoost's snippet, then connect WhatsApp and Instagram.
Plans, limits and yearly prices are on the pricing page. When you're ready, start a 7-day free trial with 100 AI replies.
Common Questions
Is SimplyBoost a Sleak alternative for Dutch businesses?
Yes. Both are Dutch. SimplyBoost is registered in Utrecht (KVK 87456346), hosted in Europe, and costs €39, €89 or €169 a month with website chat, WhatsApp and Instagram on every plan.
What does Sleak cost?
Sleak Start costs €69 a month, or €59 billed yearly. Grow costs €119 (€99 yearly) and Scale €229 (€199 yearly). Every plan includes 300 conversations a month, and each conversation after that costs €0.09 (sleak.chat/tarieven, checked 7 October 2026).
What is the difference between SimplyBoost and Sleak?
Mostly channels and included volume. SimplyBoost answers on your website, WhatsApp and Instagram on every plan and includes 500 to 6,000 AI replies. Sleak focuses on website chat, has WhatsApp in beta, and includes 300 conversations per plan.
Is Sleak (sleak.chat) the same as Sleek.chat or SleekFlow?
No. Sleak at sleak.chat is a Dutch AI chatbot builder. Sleek.chat and SleekFlow are separate companies that happen to have similar names.
Does SimplyBoost serve Dutch buyers the way Sleak does?
Yes. By default the agent replies in the language the customer writes in, so Dutch customers get Dutch answers and English or German customers get theirs, from one knowledge base. You can also fix the reply language to Dutch.
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We publish comparison pages only when they include balanced fit guidance, practical evaluation criteria, and clear user-facing answers. Thin doorway-style comparison pages are intentionally avoided.