Caster Biz

What Caster Biz does

Caster Biz (株式会社キャスター) is a Japanese remote-assistant and business process outsourcing platform founded in 2014 and headquartered in Saito, Miyazaki Prefecture, with commercial operations centered in Tokyo. The company's flagship service, CASTER BIZ assistant, delivers online secretarial, administrative, HR, accounting-support, translation, and creative tasks by combining what the company describes as AI technology with a distributed pool of 800+ remote assistants (employees and dispatch staff combined, as of April 2023). The platform targets a horizontal customer base spanning early-stage startups through large enterprises, including named users such as Mercari, Mitsui Fudosan, LIXIL, Wingarc 1st, BASE FOOD, Piara, Willgate, and UZABASE, with cumulative contracted accounts reported at 6,000+ companies as of November 2025.

The core product is delivered entirely online, with assistants plugging into client environments via integrations with Slack, Chatwork, Salesforce, kintone, HRMOS, SmartHR, Google Forms, and video conferencing tools. Service is sold on a recurring monthly subscription (BASIC plan: 30 hours/month at ¥120,000 on a 12-month contract or ¥132,000 on a 6-month contract, exclusive of tax), with custom plans for higher volumes. Around the assistant core, Caster has built an ecosystem of sub-brands: CASTER BIZ Visit (offline/onsite tasks), CASTER BIZ Recruiting (採用), CASTER BIZ HR (労務), CASTER BIZ accounting (経理BPaaS targeting listed companies, launched September 2025), and MyAssistant (flexible spot assistance). Distribution is sales-led (phone, online inquiry, free seminars) supplemented by an Introduction and Sales Partner program. The company is privately held and bootstrapped for growth, with only ~$3.7M of disclosed funding across a 2014 Incubate Fund seed and a 2019 round led by Gunosy Capital and SMBC Venture Capital.

Name

Caster Biz

Legal name

株式会社キャスター

Website

https://cast-er.com

Company type

Private

Founded year

2014

Operating status

Operating

Headcount range

1–10 employees

Short description

Caster Biz (株式会社キャスター), founded in 2014, operates Japan's first online remote-assistant platform, combining AI with a distributed pool of 800+ human assistants to deliver secretarial, administrative, HR, and accounting support to 6,000+ Japanese companies ranging from startups to large enterprises such as Mercari and Mitsui Fudosan.

Ownership category

akta.pro rank

Product category

Remote Assistant Services / Business Process Outsourcing

NAICS

Other Scientific and Technical Consulting Services (54169)

SIC

Services-Engineering, Accounting, Research, Management (8700)

akta.pro primary industry

Business Intelligence, Reporting & Visualization Services (BPAEAHAD)

Keywords

• Remote assistant services
• Online secretarial services
• Business process outsourcing
• Administrative task delegation
• AI-assisted business support

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Monthly Subscription - BASIC Plan: Core subscription service providing 30 hours of remote assistant support per month. Available in 6-month or 12-month contracts. Payment is monthly via bank transfer (advance payment required). Minimum commitment starts at 30 hours/month.
2. Custom Plan: Tailored service plans created according to specific client requirements and usage needs

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels5 records

Core offering

Caster Biz provides an online remote assistant service that combines AI technology with skilled human remote assistants (the '1/100 Talent' model) to handle secretarial, administrative, HR, accounting, translation, and creative tasks for client companies. Services are delivered entirely online with monthly subscription plans starting at 30 hours/month, supported by related offerings including CASTER BIZ accounting (BPaaS for listed companies) and CASTER BIZ Visit (offline/on-site assistance).

Product overview

CASTER BIZ is a remote assistant service platform combining AI and human talent. The core offering is the CASTER BIZ assistant service, which provides online remote assistants for secretarial, administrative, HR, accounting, translation, and creative tasks. Related products include CASTER BIZ accounting (specialized accounting BPaaS for listed companies) and CASTER BIZ Visit (offline/visit-based assistant for physical tasks). The platform also includes MyAssistant for flexible spot assistance. All services can be accessed via a button-click request system with quick service initiation.

Differentiator

Problem solved

Functional benefit

Brands

• CASTER BIZ assistant: Remote assistant service combining AI and human assistants for business task outsourcing.
• CASTER BIZ Visit
• CASTER BIZ accounting (経理BPaaS)
• CASTER BIZ Recruiting (採用)
• CASTER BIZ HR (労務)

Products and services

• CASTER BIZ assistant Core online remote assistant service combining AI and human talent to handle secretarial tasks (appointment scheduling, email handling, travel arrangements), administrative work (data entry, invoicing, sales material preparation), HR tasks (job posting, candidate communication, attendance tracking), accounting support (bookkeeping, invoice processing), translation, and creative/design tasks. Minimum 30 hours/month starting point.
• CASTER BIZ accounting Accounting BPaaS specialized for listed companies. Offers month-end closing acceleration, accounts payable/receivable management, invoice processing, and operational systematization aimed at achieving zero dedicated accounting staff.
• CASTER BIZ Visit Offline/onsite assistant service that complements the online CASTER BIZ assistant. Handles physical tasks including filing, business card scanning, document organization, and paper processing for clients needing in-person support.
• MyAssistant Flexible remote assistant service with spot assistants available. Allows clients to choose assistants based on their schedule flexibility needs, including early morning to late night availability.

Quantifiable outcome

• Monthly closing time reduced from 8-9 days to 4-5 days for some clients
• +3 more outcomes

Named customers13 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration10 records

AI capability2 records

Feature2 records

Partnerships

Two partnerships are on record, tiered minor.

• Introduction Partners (紹介パートナー)minorChannel Partner/ Reseller/ DistributorMutual referral partnership where partners introduce CASTER BIZ to their clients and receive introductions to CASTER BIZ's client base in return. No fees charged for participation. Designed for companies seeking cross-promotion opportunities.
• Sales Partners (販売パートナー)minorChannel Partner/ Reseller/ DistributorReferral partners who introduce CASTER BIZ services and receive contracted referral fees. Partners identify companies with alignment and introduce directly. Focus on organic referrals from partners who find CASTER BIZ suitable for their client needs.

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Recruit Holdings: Japanese HR/media conglomerate operating Indeed, Airレジ, and large BPO operations — broad incumbent whose AI-enabled services could compete with Caster's SMB assistant positioning.
• Persol Holdings: Major Japanese HR services and staffing conglomerate (Tempstaff, doda) with growing BPO and digital transformation offerings — represents the large incumbent alternative for enterprise back-office outsourcing decisions.
• Outsourcing Inc. One of Japan's largest staffing and BPO groups with broad offerings across engineering, manufacturing, and back-office outsourcing — overlaps with Caster's accounting/HR sub-brands as a broader incumbent in adjacent segments.
• Will Group Inc. Japanese staffing and BPO group operating across sales support, call center, and back-office segments — comparable as an established BPO incumbent but with a different go-to-market (staffing-led rather than subscription-assistant-led).

Direct peers

• FOC Inc. Japanese BPO provider focused on accounting, HR, and secretarial outsourcing for SMBs — competes in the same online back-office outsourcing category, often bundled with similar subscription-style engagement models.
• in-house Inc. Japan-based online secretary / assistant service targeting small businesses and startups, offering hourly plans for administrative and secretarial work — directly comparable offering to CASTER BIZ assistant.
• Anchor Inc. Operates an online assistant service (Online Assistant) in Japan targeting SMB back-office tasks including secretarial, accounting, and HR support — comparable subscription model and customer segment to Caster Biz.
• BACKS Inc. Japanese online assistant / virtual secretary service provider offering subscription-based remote administrative support to SMBs and startups — closest direct competitor to Caster Biz in the Japan online-assistant category.

Emerging players

• BizteX Inc. Japanese RPA / process automation vendor (BizRobo) increasingly bundling AI + human BPO services — competes with Caster's automation narrative and is building the same hybrid AI-plus-human value proposition.
• Timee Inc. Operates a Japan-based flexible work/gig platform connecting businesses with on-demand workers for short-hour tasks — adjacent model that could overlap with Caster's spot-assistant MyAssistant offering for flexible, low-commitment task work.

Market position

Weaknesses5 records

Competitive moat4 records

Key risks7 records

Key highlights8 records

Customer concentration

• Xx.com/remote_works
• Facebookfacebook.com/casterjp

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries3 records

Funding overview

Funding rounds2 records

Investors3 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Caster Biz