Top Inside Sales Outsourcing Companies in Singapore for 2026

Building a reliable B2B sales pipeline in Singapore is no small feat. The talent market is competitive, employment costs are high, and decision-makers are hard to reach. That’s why a growing number of B2B companies — whether headquartered in Singapore, expanding into the market, or using the city-state as a gateway into broader APAC — are turning to inside sales outsourcing companies to get qualified meetings on the calendar without the overhead of building an in-house SDR team from scratch.

But with more providers entering the market, figuring out which one is the right fit takes more than a Google search. This guide breaks down the top inside sales outsourcing companies in Singapore for 2026 — what each does best, where they fall short, and how to pick the one that matches your goals.

What to Expect from a Top Inside Sales Outsourcing Company in Singapore

Not all inside sales outsourcing companies deliver the same thing. Some run cold email campaigns and call it SDR. Others offer dedicated teams, AI-powered campaign management, multilingual outreach, and full pipeline visibility — and the results reflect that gap.

When you’re evaluating providers in Singapore, the baseline expectation should include qualified appointment setting, a structured lead handoff process, and a team that’s accountable to pipeline outcomes — not just activity metrics. Beyond that, the differentiators worth paying attention to are APAC market coverage, language capability, vertical experience, and whether the provider has a proven track record with companies at your scale.

The companies on this list have been selected because they clear that baseline — but they vary significantly in scope, specialisation, and fit depending on your market, ICP, and growth stage.

How to Choose the Best Inside Sales Outsourcing Partner in Singapore

Before committing to any provider, evaluate them against five key criteria:

1. APAC coverage — If Singapore is your base but not your only target market, confirm the provider has real delivery capability across SEA, ANZ, and Greater China — not just a logo on a page.
2. Language capability — Singapore B2B buyers speak English, but deals in Malaysia, Indonesia, the Philippines, and Greater China require Mandarin, Bahasa, and more. Check that your provider’s SDR team can actually conduct outreach in the languages your markets demand.
3. Vertical experience — A provider with deep SaaS and fintech campaign experience will ramp faster and perform better than a generalist, especially in Singapore’s tech-dense market.
4. Pricing model — Understand whether you’re paying per meeting, on a monthly retainer, or a hybrid. Monthly retainer models typically offer more strategic continuity; per-meeting models suit companies with very narrow ICP lists.
5. Proven Singapore case studies — Ask for campaign results specifically from Singapore or SEA markets. Regional context matters — what works in North America doesn’t always translate to APAC buyer behaviour.

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Top Inside Sales Outsourcing Companies in Singapore (2026)

• Callbox — Best for APAC Multi-Channel Inside Sales Outsourcing
• Konsyg — Best for Sales-as-a-Service with Full Outbound Cycle Management
• TDCX — Best for Enterprise-Scale Inside Sales Integrated with CX
• MemoryBlue — Best for Enterprise B2B Tech SDR with Global APAC/EMEA Coverage
• SalesCaptain — Best for Cold Email-Led Demand Generation
• The Scalelab — Best for SG + Hong Kong Enterprise Software Lead Gen
• Belkins — Best for Email-First Appointment Setting
• Kazehi Global — Best for High-Value Complex Sales Outsourcing in Singapore

1. Callbox Singapore

Best for: Singapore-based B2B companies, SaaS, fintech, cybersecurity, and tech vendors needing APAC-wide pipeline coverage, including SEA and ANZ.

With 15+ years of B2B experience and 700+ SDR professionals, Callbox is the most established inside sales outsourcing company serving Singapore and APAC. The company has run 20,000+ campaigns for enterprise clients, including Google, Salesforce, AWS, Microsoft, PayPal, Grab, and Atlassian — with a substantial portion of that work executed across the Asia Pacific region.

What separates Callbox from the field is the combination of breadth and depth. Campaigns are powered by Smart Engage, Callbox’s proprietary AI platform that handles intelligent call scheduling, lead scoring, and multi-channel nurturing across phone, email, LinkedIn, social, chat, and webinars — all from a single orchestration layer. 

For companies using Singapore as an APAC entry point or expanding from Singapore into broader regional markets, Callbox offers unmatched coverage and campaign intelligence.

• Core services: Multi-channel outbound, lead generation, appointment setting, SDR outsourcing, account-based marketing, data enrichment, SMART Engage AI platform
• Pros: 20+ years B2B experience; widest APAC presence; 15+ languages; AI-powered Smart Engage platform; enterprise client roster; 20,000+ campaigns completed
• Cons: Full-service model may exceed the scope needs of very early-stage startups

2. Konsyg

Best for: B2B SaaS, fintech, and cybersecurity companies wanting a dedicated outsourced sales team that operates like in-house SDRs.

Founded in Singapore in 2017, Konsyg takes a Sales-as-a-Service approach — providing dedicated outbound teams that own the full pipeline-generation cycle. They have strong vertical depth in fintech and tech, and their dedicated team model appeals to companies that want SDRs embedded in their sales process rather than running campaigns at arm’s length.

• Core services: Full-cycle outbound (cold calling, cold email, LinkedIn), pipeline generation, CRM integration, data enrichment
• Pros: Singapore-founded; predictable pipeline focus; strong fintech/cybersecurity vertical experience
• Cons: Smaller team scale than global providers; limited language coverage compared to Callbox

3. TDCX 

Best for: Enterprise and mid-market companies needing inside sales as part of a broader BPO engagement spanning sales, customer service, and tech support.

TDCX is a publicly listed Singapore-headquartered BPO with genuine enterprise scale. Their inside sales offering sits within a broader customer experience and revenue operations platform, making them a natural fit for companies that need sales outsourcing alongside customer success or technical support at scale.

• Core services: Inside sales, customer experience, revenue operations, AI-powered sales enablement, tech support
• Pros: Singapore HQ; publicly listed; strong enterprise track record; scalable team model
• Cons: Primary identity is CX/BPO rather than pure B2B SDR; may lack outbound specialisation depth for focused pipeline programs

4. MemoryBlue — Best for Enterprise B2B Tech SDR with Global APAC/EMEA Coverage

Best for: Enterprise SaaS, cloud, cybersecurity, and AI vendors with global ambitions across APAC and EMEA.

Formed by the merger of memoryBlue (est. 2002) and Operatix (est. 2012), MemoryBlue brings 650+ professionals across 9 global offices and 20+ languages. Their Academy training model means SDRs are developed to a consistent standard, and their client roster — Google, Adobe, Oracle — signals credibility in the enterprise tech space.

• Core services: Outsourced SDR programs, APAC/EMEA market entry, direct hire via Academy, channel partner acceleration
• Pros: Long-standing enterprise tech pedigree; global office network; strong EMEA delivery
• Cons: Enterprise and tech-sector focus limits fit for non-tech B2B; APAC delivery depth trails Callbox

5. SalesCaptain

Best for: B2B SaaS and tech companies wanting fast, lean outbound execution powered by cold email and intent data.

SalesCaptain is Singapore-based and built for speed. If your outreach strategy centres on cold email sequences and LinkedIn with intent signal integration, they offer a cost-efficient model with quick setup timelines.

• Core services: Cold email campaigns, LinkedIn outreach, intent data targeting, multi-channel sequences
• Pros: Singapore-based; fast setup; lean cost model; strong cold email execution
• Cons: Email/LinkedIn-first — limited phone outreach; not suited for complex multi-stakeholder campaigns

6. The Scalelab 

Best for: Tech, professional services, and enterprise software companies targeting Singapore and Hong Kong decision-makers.

The Scalelab operates across Singapore and Hong Kong with a multi-channel approach to B2B prospecting. A solid choice for companies with a dual-market SG/HK mandate.

• Core services: B2B lead generation, outbound marketing, targeted list building
• Pros: SG and HK offices; enterprise software focus; APAC regional expertise
• Cons: Limited to two core markets; smaller scale than Callbox

7. Belkins 

Best for: Global SaaS and technology companies wanting specialist email outreach and appointment setting with strong deliverability infrastructure.

Belkins has built a strong reputation on Clutch for email-based appointment setting with consistent outbound results across SaaS and tech verticals. US-origin but serves global clients.

• Core services: Appointment setting, email outreach, LinkedIn prospecting, inbound lead nurturing
• Pros: Strong B2B email deliverability; well-reviewed on Clutch; consistent outbound performance
• Cons: US-centric origin; APAC delivery is less established than Singapore-native providers

8. Kazehi Global

Best for: Small and mid-sized Singapore B2B companies needing focused local sales outsourcing with market-specific knowledge.

SparkSales is a boutique Singapore-native provider suited for SMBs that want local market expertise and dedicated attention at a lower price point.

• Core services: Sales outsourcing, business development, local market outreach
• Pros: Singapore-native; local market knowledge; boutique model; lower entry cost

Cons: Limited scale; not suited for APAC-wide or enterprise campaigns

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How Much Does Inside Sales Outsourcing Cost in Singapore?

Pricing for inside sales outsourcing in Singapore typically follows four models:

• Per-meeting / per-appointment: SGD $200–$700 per qualified meeting, depending on ICP complexity and target seniority. Best for companies with a narrow, well-defined target list.
• Monthly retainer: SGD $3,500–$15,000+ per month depending on team size, campaign scope, and channel mix. The most common model for sustained pipeline programs.
• Project-based: A fixed scope, fixed timeline engagement — ideal for companies running a specific campaign, entering a new market, or testing a provider before committing to a longer program. Callbox operates on this model, giving clients full campaign customisation within a defined project scope with clear deliverables and timelines. 
• Hybrid: A lower retainer combined with a per-meeting component — balances cost predictability with performance accountability.

Compare that against the fully loaded cost of a Singapore-based in-house SDR: base salary, CPF contributions (employer rate: 17%), tools (LinkedIn Sales Navigator, CRM, email automation), onboarding time of two to four months, and the very real risk of turnover. A productive in-house SDR in Singapore typically costs SGD $80,000–$120,000 annually before tools and management overhead. Outsourcing removes that fixed cost, replaces it with a variable expense tied to delivery, and gets the pipeline moving in weeks — not months.

Why Callbox Is Singapore’s Leading Inside Sales Outsourcing Partner

For companies that need more than email sequences and a spreadsheet of contacts, Callbox is in a different category. The combination of 20+ years of B2B experience, a dedicated Singapore office, APAC-widest delivery coverage, 15+ language capability, and AI-powered campaign orchestration through Smart Engage makes Callbox the only provider on this list that can genuinely deliver inside sales outsourcing at scale — whether you’re targeting Singapore alone or building a pipeline across Southeast Asia, Australia, New Zealand, and Greater China simultaneously.

Clients like PayPal, Grab, Atlassian, and Google have trusted Callbox for exactly this reason: consistent, qualified pipeline with the infrastructure to grow as fast as their ambitions demand.

FAQ: Inside Sales Outsourcing in Singapore

What is inside sales outsourcing, and how does it work for Singapore companies? 

Inside sales outsourcing is when a company partners with an external provider to handle outbound prospecting, SDR activities, and appointment setting. For Singapore companies, it means getting a trained team running multi-channel outreach — calls, emails, LinkedIn — and handing off qualified meetings to your closers, without the cost or time of building that function in-house.

What is the difference between inside sales outsourcing and BPO? 

BPO (Business Process Outsourcing) covers broad operational functions — customer service, data entry, and back-office work. Inside sales outsourcing is specifically revenue-focused: prospecting, pipeline generation, and appointment setting. The goal is qualified opportunities for your sales team, not volume call handling.

Which inside sales outsourcing company is best for Singapore and APAC? 

Callbox is the strongest option for companies that need genuine APAC-wide coverage, multilingual SDR capability, and enterprise-proven campaign delivery. Konsyg is a strong fit for Singapore-native SaaS and fintech companies; TDCX suits enterprise accounts that need inside sales integrated with broader CX operations.

Is inside sales outsourcing worth it for Singapore B2B companies? 

For most B2B companies, yes. The cost of building and maintaining an in-house SDR team in Singapore — accounting for CPF, tools, ramp time, and attrition — typically exceeds the cost of outsourcing to a proven provider. An experienced outsourced team produces results faster, with fewer variables.

Can an outsourced inside sales team in Singapore handle APAC-wide outreach? 

Not all providers can. Callbox is the only inside sales outsourcing company on this list with offices across Singapore, Malaysia, the Philippines, Australia, and Hong Kong, plus SDR teams covering 15+ languages. For genuine APAC-wide execution, Callbox is the only provider with the infrastructure to match.