SleekFlow is the cheaper entry point for small Singapore teams, at US$49 a month (billed yearly) for 3 users and 500 monthly active contacts, plus a US$15 monthly WhatsApp number fee. respond.io starts higher, at US$79 a month billed yearly or US$99 billed monthly, but includes 5 users and 1,000 monthly active contacts, which suits larger support teams. Neither plan includes WhatsApp message fees, so the real monthly bill depends on how many contacts you talk to and how many templates you send.
This comparison is for Singapore SMEs, clinics, tuition centres, property agencies and e-commerce brands choosing a WhatsApp inbox in 2026. Every plan price below comes from each vendor's public pricing page in November 2026. Meta's own message rates for Singapore numbers are the same whichever platform you choose, so we keep them separate from the software fee.
SleekFlow vs respond.io: plan prices side by side
Both vendors price per plan, then charge for extra users and extra monthly active contacts (MACs). A MAC is any contact you message or who messages you in a month, so a busy broadcast list can push you into a higher tier faster than your headcount does.
| Item | SleekFlow | respond.io |
|---|---|---|
| Entry plan | Essential, US$49/mo billed yearly (US$588/yr) | Starter, US$79/mo billed yearly, US$99 billed monthly |
| Users on entry plan | 3 | 5 |
| Contacts on entry plan | From 500 MACs | From 1,000 MACs |
| Middle plan | Pro, US$109/mo billed yearly, 10 users | Growth, US$159/mo billed yearly, US$199 monthly, 10 users |
| Top self-serve plan | Premium, US$279/mo billed yearly, 10 users, from 1,000 MACs | Advanced, US$279/mo billed yearly, US$349 monthly, 10 users |
| Extra user | US$15 (Essential), US$25 (Pro, Premium) | US$12 (Starter), US$20 (Growth), US$24 (Advanced) |
| WhatsApp number | US$15/month hosting fee | No separate number fee listed |
| WhatsApp message fees | Charged per SleekFlow's rate card | Not included, paid as WhatsApp credit top-ups |
Two details are easy to miss. SleekFlow's headline prices are the yearly-billing rate, so paying month to month costs more. And neither page states whether the WhatsApp message charge is Meta's rate passed through at cost or a resold rate, so ask both vendors for their Singapore rate card in writing before you sign.
What a Singapore team actually pays each month
Take a typical small business: 3 agents, about 500 active contacts a month, and 2,000 marketing template messages to Singapore numbers. Meta's October 2026 rate for a marketing message to a Singapore recipient is about US$0.0732, so the Meta share is roughly US$146.40 (about S$187) a month on any platform. The software fee is where the vendors differ.
- SleekFlow Essential: US$49 plan plus US$15 number fee, so US$64 a month (about S$82) before message fees, billed yearly.
- respond.io Starter: US$79 a month billed yearly (about S$101), or US$99 monthly (about S$127), before WhatsApp credit.
- RichAutomate Pro: US$15 a month (about S$19), and the full amount is credited to your wallet. The 2,000 messages use US$4 of per-message fees (US$0.002 each) plus at most US$8 of window fees (US$0.004 per 24-hour window), so usage fits inside the plan credit. Meta bills its rate straight to your own card.
Grow to 10 agents and 2,000 contacts and the gap widens, because both SleekFlow and respond.io move you to a higher tier or add per-seat and per-contact charges. Run your own volumes through the WhatsApp API cost calculator before you compare quotes.
Want to see your Singapore number on a cheaper plan? RichAutomate plans start at about S$12 a month with no setup fee and no contract. See Singapore pricing in SGD.
Where SleekFlow is the better fit
SleekFlow started in Hong Kong and built its product around retail and social commerce in Asia. It is a sensible pick if your team sells through several channels at once and wants one inbox for WhatsApp, Instagram, Facebook Messenger and web chat, with shop catalogues and payment links close to the chat. The Essential plan covers 5 channels and Pro covers 10.
Get the India 2026 WhatsApp BSP price comparison
Wati vs AiSensy vs Interakt vs RichAutomate: Meta rates, platform fees and hidden costs, side by side. We send it to your WhatsApp in a minute.
The trade-off is the contact cap. Essential starts at 500 MACs, and a single broadcast to an older customer list can push you past it. If your list is large and your team is small, model the MAC add-on before committing to a yearly plan.
Where respond.io is the better fit
respond.io is built for support and sales teams that route a high volume of conversations. Its strength is workflow automation, assignment rules and reporting across agents, which matters once you have 5 or more people answering chats. The Starter plan already includes 5 users and 1,000 contacts, so a mid-sized team gets more room for the price.
The trade-off is cost at the low end. A 2-person clinic or tuition centre pays for seats and features it will not use, and WhatsApp fees are still a separate top-up on top of the plan.
A third option: pay Meta directly, keep the software cheap
Every provider in Singapore sends through the same Meta Cloud API. What changes is how much software you buy on top and who bills the message fee. RichAutomate runs Client Pay only outside India: Meta charges your business directly, at Meta's own rate, on the card in your Meta Business Manager, and we never mark it up.
| Need | SleekFlow | respond.io | RichAutomate |
|---|---|---|---|
| Lowest monthly software fee | US$49 + US$15 number | US$79 | US$9 Starter, US$15 Pro |
| Team seats on entry plans | 3 | 5 | 2 on Starter, up to 5 on Pro |
| Meta message billing | Vendor rate card | Vendor top-up credit | Meta bills your card at cost |
| Plan fee | Software fee | Software fee | Credited to your wallet |
| Contract | Yearly for headline price | Monthly or yearly | Monthly, cancel any time |
Free-form replies you send inside the 24-hour customer service window are free under Meta's current pricing, so a team that mostly answers inbound questions pays Meta very little. The main cost driver is marketing templates. See our SleekFlow alternative page for Singapore for a side-by-side on features, and the respond.io alternatives guide for Singapore if you are leaving respond.io.
Compliance points for Singapore
Whichever platform you pick, WhatsApp marketing to Singapore numbers falls under the PDPA Do Not Call rules. Either hold clear consent from each customer, or check the number against the DNC Registry, where a check is valid for 21 days. Bulk messages also need a working unsubscribe option, honoured within 10 business days under the Spam Control Act. Use a platform that records opt-outs per contact so you can stop sending straight away.
Meta also has to verify your business before you can scale sends. Have your ACRA business profile ready, and keep the business name on your Meta Business Manager the same as the name on your registration. For a wider shortlist, read our best WhatsApp Business API providers in Singapore roundup.
How to choose in five minutes
- Pick SleekFlow if you sell across WhatsApp, Instagram and Facebook, have 3 or fewer agents and a contact list under 500 a month.
- Pick respond.io if you have 5 or more agents, need routing and reporting, and are happy to pay for it.
- Pick RichAutomate if WhatsApp is your main channel, you want Meta's rate with no markup, and you want campaigns, chatbot flows and the API from about S$12 a month.
Prices change often in this market, so check each vendor's page on the day you buy. Compare plans in USD on our international pricing page or the full pricing page, then start a 14-day free trial and connect your Singapore number today.